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Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review)

  • Authors:
    • Zhenjun Xi
    • Xiaodong Li
    • Chunhui Yang
    • Li Wang
    • Jingxin Mao
    • Qianqian Liu
    • Chang Liu
    • Qian Li
    • Yuanfang Hou
    • Jie Wan
    • Chengzhuo Yang
    • Feiji Sun
    • Chao Yu
    • Miao Wang
    • Baocheng Yuan
    • Yongsheng Liu
    • Qing Hu
    • Li Zhang
    • Xuemei Li
    • Xiaobing Li
  • View Affiliations / Copyright

    Affiliations: Science and Technology Industry Development Center, Chongqing Medical and Pharmaceutical College, Chongqing 401331, P.R. China, Department of Nephrology, Guangdong Provincial Key Laboratory of Major Obstetric Diseases, Guangdong Provincial Clinical Research Center for Obstetrics and Gynecology, The Third Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510150, P.R. China, Department of Science and Education, The First Affiliated Hospital of Chongqing Medical and Pharmaceutical College, Chongqing 400060, P.R. China, Department of Occupational Disease and Poisoning Medicine, The First Affiliated Hospital of Chongqing Medical and Pharmaceutical College, Chongqing 400060, P.R. China, Special Medical Department, Daping Hospital, Army Medical University, Chongqing 400042, P.R. China, Department of Rehabilitation Medicine, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China, Department of Neurosurgery, The First Affiliated Hospital of Chongqing Medical and Pharmaceutical College, Chongqing 400060, P.R. China, Department of Pediatrics, The First Affiliated Hospital of Chongqing Medical and Pharmaceutical College, Chongqing 400060, P.R. China, Department of Neurology, National Health Commission Key Laboratory of Diagnosis and Treatment on Brain Functional Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
    Copyright: © Xi et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 192
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    Published online on: May 19, 2026
       https://doi.org/10.3892/ijmm.2026.5863
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Abstract

The expanding footprint of human radiation exposure, driven by advances in interventional diagnostics, the resurgence of the nuclear industry and the deep‑space exploration, has necessitated a paradigm shift from understanding acute syndromes to the biological effects of chronic, low‑dose‑rate irradiation. Unlike acute injury, chronic radiation injury (CRI) is a distinct biological entity characterized by the progressive accumulation of sublethal damage, niche remodeling and the propagation of the senescence‑associated secretory phenotype, which collectively drive systemic inflammaging. Deciphering these non‑linear dose‑response dynamics requires high‑fidelity animal models that deconstruct mechanisms often obscured by latency in human epidemiological studies. The present review critically synthesizes the methodological evolution of CRI modeling, contrasting continuous external beam paradigms with internal radionuclide contamination systems. The present study aimed to summarize the pathophysiology of multi‑organ exhaustion, specifically detailing the mechanisms of hematopoietic niche senescence, pulmonary fibrosis and stochastic carcinogenesis, and propose a multidimensional validation framework integrating deep phenotyping, digital pathology and circulating biomarkers to establish rigorous construct validity. Finally, the present study aimed to bridge the translational gap by aligning preclinical screening with the Food and Drug Administration Animal Rule‑a regulatory pathway permitting the approval of medical countermeasures based on animal efficacy data when human trials are unethical, advocating a future defined by single‑cell spatial omics and artificial intelligence‑driven precision radioprotection.

Introduction

Human interaction with ionizing radiation has evolved from passive environmental exposure to a complex interface defined by advanced medical diagnostics, nuclear industry expansion and long-duration space exploration (1). While acute radiation syndrome (ARS) resulting from high-dose exposure is characterized, the biological consequences of chronic, low-dose-rate (LDR) exposure represent a knowledge gap (2). It is necessary to distinguish CRI from the delayed effects of acute radiation exposure (DEARE). While DEARE refers to late-onset pathology emerging months to years following an acute high-dose/high-dose-rate exposure, CRI results from protracted LDR irradiation over months to years, characterized by continuous sublethal damage accumulation, cell senescence and inflammaging (3).

Unlike the rapid cell ablation seen in acute scenarios, CRI is characterized by persistent, progressive pathological changes (4). LDR exposure triggers a unique interplay of mitochondrial dysfunction and cytosolic DNA sensing pathways (cyclic GMP-AMP-STING (cGAS/STING), leading to a Senescence-Associated Secretory Phenotype (SASP, a complex pro-inflammatory secretome produced by senescent cells) (5). This inflammaging microenvironment drives progressive fibrosis, immune dysregulation and genomic instability distinct from acute injury patterns (6). Consequently, the linear no-threshold model-which assumes that biological risk is directly proportional to radiation dose without any safe lower limit-often fails to predict the non-linear, stochastic risks of chronic exposure, necessitating re-evaluation through dedicated experimental systems (7).

Animal models of CRI are key tools for deconvoluting these complex biological responses (8). They provide the only rigorous means to isolate the effects of dose rate from total absorbed dose, enabling the study of temporal damage accumulation vs. repair kinetics (9). Moreover, these models serve as the platforms for the rigorous validation of next-generation medical countermeasures (MCMs) targeting late-onset effects of both CRI and acute high-dose irradiation (DEARE), such as radiation-induced lung fibrosis and secondary malignancy (10). However, the fidelity of current CRI models faces scrutiny (11). Many historical models using fractionated acute irradiation inadequately mimic the continuous, low-intensity stress of environmental LDR (12-14). Furthermore, translating findings from inbred rodent strains to genetically diverse human populations is challenging due to species-specific differences in telomere biology and immune surveillance (13). Future models must integrate humanized systems and reflect the heterogeneity of real-world exposure (14).

Complementing experimental data with epidemiological evidence from human cohorts provides a foundational understanding of the long-term risks associated with chronic radiation. Long-term follow-up studies of Chernobyl liquidators and Fukushima cleanup workers have revealed elevated risks of non-cancerous pathologies, such as cataracts and circulatory disease, alongside increased incidences of leukemia and thyroid cancer (15-17). Similarly, occupational cohorts of nuclear power plant workers and healthcare professionals, particularly interventional radiologists and cardiologists, demonstrate an association between cumulative low-dose exposure and hematopoietic dysregulation or genomic instability (16,17). However, human studies are typically confounded by lifestyle variables, inaccurate retrospective dosimetry and the substantial latency period between exposure and symptomatic manifestation. These limitations highlight the translational gap that necessitates the development of high-fidelity animal models (17). By accurately simulating human exposure paradigms under controlled conditions, these models enable the identification of insidious molecular mechanisms such as niche remodeling and SASP-driven inflammaging that remain elusive in retrospective human analyses. Thus, integrating human epidemiological findings with mechanistic animal studies is key for establishing evidence-based occupational safety thresholds and precision radioprotection strategies (18).

The present review provides a comprehensive critique of the methodological and conceptual evolution of CRI animal models. The present study collected literature across major databases, including PubMed (pubmed.ncbi.nlm.nih.gov/), Scopus (scopus.com/), and Web of Science (webofscience. com/) from inception up to December 2025, specifically focusing on LDR irradiation, mechanistic modeling (SASP, oxidative stress) and translational countermeasures. The present study aimed to summarize advances in continuous external exposure and internal radionuclide contamination models, highlighting their relevance to modern radiobiology. The present study aimed to address the identification of robust cross-species biomarkers, including circulating microRNAs (miRs) and inflammatory signatures, as well as the integration of single-cell multi-omics into model validation, proposing a forward-looking framework to enhance the translational power of chronic radiation research (Fig. 1).

Distinction between ARS and CRI:
Dose-rate-dependent temporal and pathobiological divergence.
Schematic of the radiobiological trajectories underlying ARS and
CRI as a function of dose rate, exposure pattern and temporal
evolution. ARS results from HD or HDR irradiation, characterized by
immediate energy deposition over hours to days, leading to
apoptosis and necrosis, rapid tissue ablation, bone marrow failure
and pronounced deterministic effects, such as gastrointestinal
mucosal breakdown, cutaneous burns and neurovascular
collapse-driven by acute cytokine release and systemic inflammatory
responses. CRI arises from prolonged LDR or environmental exposure
over months to years, typically delivered in a continuous or
fractionated manner. This favors the accumulation of sublethal DNA
damage, cellular senescence with activation of the SASP and
persistent genomic instability. These processes promote chronic
oxidative stress, tissue remodeling, progressive fibrosis, immune
dysregulation and increased stochastic risks of carcinogenesis.
ARS, acute radiation syndrome; CRI, chronic radiation injury; HDR,
high-dose-rate; LDR, low-dose-rate; SASP, senescence-associated
secretory phenotype.

Figure 1

Distinction between ARS and CRI: Dose-rate-dependent temporal and pathobiological divergence. Schematic of the radiobiological trajectories underlying ARS and CRI as a function of dose rate, exposure pattern and temporal evolution. ARS results from HD or HDR irradiation, characterized by immediate energy deposition over hours to days, leading to apoptosis and necrosis, rapid tissue ablation, bone marrow failure and pronounced deterministic effects, such as gastrointestinal mucosal breakdown, cutaneous burns and neurovascular collapse-driven by acute cytokine release and systemic inflammatory responses. CRI arises from prolonged LDR or environmental exposure over months to years, typically delivered in a continuous or fractionated manner. This favors the accumulation of sublethal DNA damage, cellular senescence with activation of the SASP and persistent genomic instability. These processes promote chronic oxidative stress, tissue remodeling, progressive fibrosis, immune dysregulation and increased stochastic risks of carcinogenesis. ARS, acute radiation syndrome; CRI, chronic radiation injury; HDR, high-dose-rate; LDR, low-dose-rate; SASP, senescence-associated secretory phenotype.

Pathophysiological characteristics of CRI

Dosimetric profile: Protracted LDR exposure

The fundamental pathophysiology of CRI diverges from ARS (19). While ARS is driven by immediate, massive cellular ablation following high-dose-rate insult, CRI is the consequence of protracted exposure to LDR ionizing radiation (20). The biological outcome is governed not only by the total absorbed dose but also by DR (21). Under LDR conditions, the continuous induction of DNA damage engages adaptive response mechanisms, however, the persistent stress eventually overwhelms cellular fidelity, leading to the accumulation of sublethal damage rather than immediate cell death (22).

Populations at risk extend beyond traditional nuclear industry workers to include interventional radiologists, astronauts exposed to galactic cosmic rays and residents in high background radiation areas (23). Unlike the rapid onset of acute symptoms, CRI is characterized by a latent window, in which sub-clinical metabolic reprogramming and oxidative fluctuations occur prior to symptomatic manifestation (24). This progression complicates early risk stratification, rendering traditional biodosimetry markers ineffective and posing a challenge for precision radiation protection (Table I) (25).

Table I

Comparative pathophysiology: ARS vs. CRI.

Table I

Comparative pathophysiology: ARS vs. CRI.

FeatureARSCRI
Exposure patternHigh-dose, short duration (minutes to hours)Low-dose-rate, protracted (months to years)
Primary cell fateApoptosis, necrosis (rapid cell loss)Senescence, genomic instability, clonal expansion
Dominant mechanismDirect DNA double-strand breaks, stem cell ablationOxidative stress cycles, inflammaging (SASP)
Latency periodHours to weeks (immediate toxicity)Months to decades
Hematopoietic responseRapid pancytopenia (bone marrow failure)Lineage skewing (myeloid bias), fatty marrow remodeling
Tissue remodelingAcute inflammation, edemaProgressive fibrosis, extracellular matrix deposition
Carcinogenic riskDeterministic (severity increases with dose)Stochastic (probability increases with dose) accumulation

[i] ARS, acute radiation syndrome; CRI, chronic radiation injury; SASP, senescence-associated secretory phenotype.

Systemic cross-talk and multi-organ exhaustion

CRI is a systemic disease, propagated by complex inter-organ signaling rather than isolated tissue injury. The hematopoietic system serves as the most sensitive biological indicator and primary responsive target of LDR toxicity (26). Beyond direct DNA damage to hematopoietic stem cells (HSCs), chronic exposure remodels the bone marrow microenvironment (27). Radiation-induced stromal senescence and adipogenesis (fatty marrow) create a hostile niche that fails to support HSC self-renewal, leading to HSC exhaustion, persistent cytopenia and a pre-leukemic state of clonal instability (28). The immune system undergoes a paradoxical shift termed inflammaging. While radiation depletes naïve lymphocyte pools (immunosenescence), damage-associated molecular patterns released from stressed cells trigger the cGAS/STING pathway, driving a sustained release of pro-inflammatory cytokines (IL-6, TNF-α) (29). This chronic low-grade inflammation not only impairs pathogen clearance but also creates a tumor-permissive microenvironment (30). The central nervous system (CNS), previously considered radioresistant, exhibits vulnerability through neuroinflammation and the inhibition of hippocampal neurogenesis, manifesting as cognitive rigidity (diminished mental flexibility and impaired adaptation to changing environmental demands) and autonomic dysregulation (31). Furthermore, reproductive toxicity involves germline DNA fragmentation and endocrine axis disruption, creating a cycle of systemic physiological decline amplified by oxidative stress (32).

Genomic instability and epigenetic drift

The molecular hallmark of CRI is genomic instability, a state where the genome acquires an increased tendency to alteration. Unlike the transient reactive oxygen species (ROS) burst in acute exposure, CRI establishes a cycle of chronic oxidative stress driven by mitochondrial dysfunction (33). Leakage of electrons from damaged electron transport chains generates persistent ROS, causing continuous oxidative base damage-specifically the formation of 8-oxo-7,8-dihydro-2'-deoxyguanosine (34). Damage is not confined to directly irradiated cells (35). Through the radiation-induced bystander effect, irradiated cells transmit distress signals (via exosomes and gap junctions) to non-irradiated neighbors, propagating genomic instability (36). Studies highlight the role of epigenetic drift (aberrant DNA methylation and histone modifications) in locking cells into a dysfunctional state (37,38). These heritable epigenetic marks explain why radiation effects persist after exposure ceases, potentially affecting unexposed offspring via transgenerational inheritance (Fig. 2) (38).

Role of oxidative stress signaling in
mediating chronic radiation-induced systemic toxicity. Molecular
cascades connecting chronic low-dose exposure to multi-organ
pathology. Prolonged exposure to low-dose ionizing radiation drives
the sustained accumulation of ROS, establishing a state of
persistent oxidative stress and cumulative DNA damage. This
oxidative burden serves as a master switch, concurrently activating
distinct stress-response pathways: Upregulation of p53 signaling
mediates cell cycle arrest and senescence, primarily contributing
to hematopoietic stem cell exhaustion and immune dysfunction.
Chronic activation of NF-κB propagates a pro-inflammatory
microenvironment, driving tissue fibrosis and stochastic
tumorigenesis. These molecular perturbations culminate in
widespread cellular dysfunction, manifesting as clinical injury
across the hematopoietic, immune, nervous and reproductive systems.
ROS, reactive oxygen species.

Figure 2

Role of oxidative stress signaling in mediating chronic radiation-induced systemic toxicity. Molecular cascades connecting chronic low-dose exposure to multi-organ pathology. Prolonged exposure to low-dose ionizing radiation drives the sustained accumulation of ROS, establishing a state of persistent oxidative stress and cumulative DNA damage. This oxidative burden serves as a master switch, concurrently activating distinct stress-response pathways: Upregulation of p53 signaling mediates cell cycle arrest and senescence, primarily contributing to hematopoietic stem cell exhaustion and immune dysfunction. Chronic activation of NF-κB propagates a pro-inflammatory microenvironment, driving tissue fibrosis and stochastic tumorigenesis. These molecular perturbations culminate in widespread cellular dysfunction, manifesting as clinical injury across the hematopoietic, immune, nervous and reproductive systems. ROS, reactive oxygen species.

Stochastic carcinogenesis and clonal evolution

A key long-term consequence of CRI is the elevation of stochastic carcinogenic risk (39). According to the LNT model, chronic accumulation of DNA mis-repairs increases the probability of malignant transformation (40).

Under continuous immune pressure and oxidative stress, somatic cells with advantageous mutations (in TP53 or DNA methyltransferase 3A) may undergo clonal expansion, a phenomenon known as clonal hematopoiesis of indeterminate potential (41). This clonal evolution serves as a precursor to radiation-induced leukemias and solid tumors (42).

Compared with spontaneous cancer, radiation-associated malignancies exhibit distinct mutational signatures and extended latency periods (43). The spectrum includes leukemia, thyroid papillary carcinoma and lung fibrosis-associated cancers (44). These mechanistic insights underscore the need for refined radiobiological models that recapitulate these stochastic events to guide international occupational safety standards (Fig. 3; Table II).

Chronic radiation injury:
Organ-specific pathology and molecular drivers. Pathophysiological
sequelae of protracted low-dose-rate exposure compared to acute
injury. The hematopoietic compartment acts as the primary most
sensitive biological indicator and early responder to radiation
toxicity. Chronic stress drives HSC exhaustion and remodels the
niche into an adipogenic (fatty marrow) state, leading to
persistent cytopenia and regenerative failure. The immune
microenvironment shifts toward a pro-inflammatory inflammaging
state. Activated macrophages and senescent cells secrete SASP
factors (IL-6, TNF-α) via the cGAS/STING pathway, creating a
tumor-permissive environment. The unifying molecular mechanism
involves a self-perpetuating cycle of mitochondrial dysfunction
(ROS leakage) and genomic instability (γ-H2AX accumulation). This
triggers p53-mediated cell cycle arrest, driving the cell
senescence that underlies systemic tissue dysfunction. The central
nervous system exhibits microglial-mediated neuroinflammation. This
results in synaptic stripping (loss of dendritic spines) in the
hippocampus, manifesting clinically as cognitive rigidity and
behavioral deficit. HSC, hematopoietic stem cell; SASP,
senescence-associated secretory phenotype; TNF, tumor necrosis
factor; ROS, reactive oxygen species; cGAS, cyclic GMP-AMP
synthase; STING, stimulator of interferon genes.

Figure 3

Chronic radiation injury: Organ-specific pathology and molecular drivers. Pathophysiological sequelae of protracted low-dose-rate exposure compared to acute injury. The hematopoietic compartment acts as the primary most sensitive biological indicator and early responder to radiation toxicity. Chronic stress drives HSC exhaustion and remodels the niche into an adipogenic (fatty marrow) state, leading to persistent cytopenia and regenerative failure. The immune microenvironment shifts toward a pro-inflammatory inflammaging state. Activated macrophages and senescent cells secrete SASP factors (IL-6, TNF-α) via the cGAS/STING pathway, creating a tumor-permissive environment. The unifying molecular mechanism involves a self-perpetuating cycle of mitochondrial dysfunction (ROS leakage) and genomic instability (γ-H2AX accumulation). This triggers p53-mediated cell cycle arrest, driving the cell senescence that underlies systemic tissue dysfunction. The central nervous system exhibits microglial-mediated neuroinflammation. This results in synaptic stripping (loss of dendritic spines) in the hippocampus, manifesting clinically as cognitive rigidity and behavioral deficit. HSC, hematopoietic stem cell; SASP, senescence-associated secretory phenotype; TNF, tumor necrosis factor; ROS, reactive oxygen species; cGAS, cyclic GMP-AMP synthase; STING, stimulator of interferon genes.

Table II

Progression of chronic radiation injury.

Table II

Progression of chronic radiation injury.

PhaseTime post-exposureBiological eventsClinical manifestationsDetectable biomarkers
Initial/latent0-6 monthsMitochondrial dysfunction; ROS accumulation; DNA mis-repair; initiation of epigenetic driftLargely asymptomatic; sub-clinical metabolic shifts; mild fatigueγ-H2AX foci (lymphocytes); 8-oxo-dG (urine); transient lymphocyte dip
Inflammatory6-12 monthsOnset of senescence-associated secretory phenotype; macrophage activation (M1 polarization); endothelial activationDecreased exercise tolerance; recurrent mild infections; gut dysbiosisPlasma IL-6, TNF-α; elevated CRP; upregulation of ICAM-1/VCAM-1
Fibrotic1-2 yearsMyofibroblast differentiation; excessive ECM deposition; capillary rarefaction; tissue stiffeningPulmonary fibrosis (dyspnea); nephropathy (hypertension); malabsorptionTGF-β1; pro-collagen peptides (PIIINP); microalbuminuria; circulating miR (miR-21)
Degenerative>2 yearsStem cell exhaustion (senescence); clonal hematopoiesis; genomic instability threshold breachedBone marrow failure (refractory anemia); cognitive decline; secondary malignancies (leukemia/solid tumors)Shortened telomeres; p16INK4a expression; clonal mutations (DNMT3A); high frailty index score

[i] ROS, reactive oxygen species; CRP, C-reactive protein; ICAM-1, intercellular adhesion molecule 1; VCAM-1, vascular cell adhesion molecule 1; ECM, extracellular matrix; PIIINP, procollagen III N-terminal peptide; miR, microRNA; Dnmt3a, DNA methyltransferase 3A.

Methodological paradigms for modeling CRI

The translational validity of animal models hinges on the fidelity with which they replicate the physics and dosimetry of human exposure (45). While acute high-dose models are well-established, simulating the protracted nature of CRI requires precise control over dose accumulation, temporal distribution and linear energy transfer (LET) (46-48). Existing methodological approaches use X-ray and γ-ray sources (60Co, 137Cs) due to their stable energy output and tissue penetration profiles (47,48). However, the field is evolving from static exposures to sophisticated dynamic systems that decouple DR from total absorbed dose, enabling the differentiation between repairable sublethal damage and cumulative irreversible injury (48).

External beam irradiation: From systemic to targeted precision

External beam irradiation is the cornerstone of radiobiological modeling, categorized by the extent of anatomical coverage. Whole-body irradiation (WBI) is the standard for simulating systemic catastrophe, such as large-scale nuclear accidents or prolonged occupational exposure in unshielded environments (49). By delivering a homogeneous dose across all physiological compartments, WBI effectively reproduces the syndromic nature of RI, capturing the interplay between bone marrow failure (hematopoietic syndrome) and systemic immune collapse (50). A challenge in WBI is achieving dosimetric homogeneity (51). Variations in animal geometry can lead to hot spots (overdose) or cold spots (underdose), potentially confounding survival data (52). Furthermore, WBI typically induces lethal acute GI toxicity before chronic fibrotic phenotypes manifest (53). To address this, fractionated low-dose regimens are employed to allow animals to survive the acute phase and develop late-onset pathology (54). To mimic scenarios such as localized radiotherapy toxicity or partial shielding, partial body irradiation selectively targets specific organs (thorax, brain) while sparing the bone marrow (55). Research has moved beyond lead shielding to use small animal radiation research platforms (56). These systems employ micro-CT guidance to deliver conformal radiation beams with sub-millimeter precision (57). This allows the study of organ-specific radiosensitivity (radiation-induced lung fibrosis) without the confounding variable of systemic hematopoietic collapse (Fig. 4) (58).

Methodological paradigms for modeling
CRI: External beam irradiation, internal radionuclide exposure and
non-targeted BE. Schematic of the principal experimental strategies
used to model CRI in vivo, highlighting complementary
approaches that capture distinct physical, dosimetric and
biological dimensions of prolonged radiation exposure. (A) External
beam irradiation models. WBI delivers a homogeneous dose to
simulate systemic exposure scenarios such as nuclear accidents or
unshielded occupational environments, enabling assessment of global
hematopoietic and immune failure. PBI, achieved through physical
shielding or image-guided precision platforms, restricts radiation
to selected anatomical regions, allowing organ-specific injury
(lung or brain) to be studied while sparing critical bone marrow
compartments. (B) Internal exposure and radionuclide deposition.
Internal contamination models reproduce biologically realistic
exposure via inhalation, ingestion or wound entry of radionuclides,
followed by tissue-specific deposition (bone, thyroid). These
systems integrate radionuclide biokinetics, effective half-life,
and LET and are indispensable for studying chronic low-dose-rate
exposure and high-LET particle effects that cannot be mimicked by
external beams. (C) RIBE. Non-targeted effects are demonstrated by
intercellular signaling from irradiated target cells to
non-irradiated bystander cells through ROS, cytokines and
exosome-mediated communication, resulting in DNA damage and
persistent stress responses in distal tissue. Collectively, these
paradigms underscore the need for integrated modeling frameworks to
capture the complexity of CRI, encompassing direct energy
deposition, indirect microenvironmental signaling and long-term
systemic consequences. CRI, chronic radiation injury; WBI,
whole-body irradiation; PBI, partial-body irradiation; LET, linear
energy transfer; RIBE, radiation-induced bystander effect; ROS,
reactive oxygen species.

Figure 4

Methodological paradigms for modeling CRI: External beam irradiation, internal radionuclide exposure and non-targeted BE. Schematic of the principal experimental strategies used to model CRI in vivo, highlighting complementary approaches that capture distinct physical, dosimetric and biological dimensions of prolonged radiation exposure. (A) External beam irradiation models. WBI delivers a homogeneous dose to simulate systemic exposure scenarios such as nuclear accidents or unshielded occupational environments, enabling assessment of global hematopoietic and immune failure. PBI, achieved through physical shielding or image-guided precision platforms, restricts radiation to selected anatomical regions, allowing organ-specific injury (lung or brain) to be studied while sparing critical bone marrow compartments. (B) Internal exposure and radionuclide deposition. Internal contamination models reproduce biologically realistic exposure via inhalation, ingestion or wound entry of radionuclides, followed by tissue-specific deposition (bone, thyroid). These systems integrate radionuclide biokinetics, effective half-life, and LET and are indispensable for studying chronic low-dose-rate exposure and high-LET particle effects that cannot be mimicked by external beams. (C) RIBE. Non-targeted effects are demonstrated by intercellular signaling from irradiated target cells to non-irradiated bystander cells through ROS, cytokines and exosome-mediated communication, resulting in DNA damage and persistent stress responses in distal tissue. Collectively, these paradigms underscore the need for integrated modeling frameworks to capture the complexity of CRI, encompassing direct energy deposition, indirect microenvironmental signaling and long-term systemic consequences. CRI, chronic radiation injury; WBI, whole-body irradiation; PBI, partial-body irradiation; LET, linear energy transfer; RIBE, radiation-induced bystander effect; ROS, reactive oxygen species.

Non-targeted effects (NTEs) and bystander models

Emerging evidence suggests CRI is not solely the result of direct energy deposition but is also mediated by NTEs (59). Models of indirect irradiation focus on how radiation signals are propagated through the microenvironment (60-63). Bystander and abscopal models investigate how irradiated cells communicate with non-irradiated neighbors via gap junctions, exosomes and soluble factors (ROS, cytokines) (61). By irradiating a specific volume (such as the liver) and assessing damage in distant organs (such as the lung), researchers can elucidate the systemic propagation of inflammatory signals (62). In ecological toxicology contexts, indirect exposure also refers to the interaction with irradiated media (water or soil) (63). These models are essential for distinguishing between direct radiotoxicity and the secondary toxicity of radiation-induced chemical species (radiolysis products) (64).

Internal contamination: Challenge of internal emitters

While external beams simulate prompt exposure, internal contamination is the most biologically faithful model for occupational hazards (such as uranium mining) or post-accident fallout (65). The pathology is dictated by the chemical nature of the radionuclide (66). For example, osteotropic isotopes (90Sr, 226Ra) accumulate in the bone matrix, causing chronic marrow suppression and osteosarcoma, whereas radioiodine (131I) targets the thyroid (67). These models require precise calculation of body burden (the total amount of a radionuclide present in the organism at a given time) and effective half-life (68). Internal models are key for studying high-LET radiation (α-particles from plutonium or radon) (69). Unlike low-LET γ-rays, α-particles cause dense ionization tracks and complex DNA double-strand breaks that are refractory to repair (70). This biological insult highlights the limitation of using external X-rays to mimic internal α-emitter contamination (71).

Complex exposure scenarios: Combined injury (CI) and LDR

To bridge the gap between laboratory conditions and real-world catastrophes, advanced models integrate multiple stressors (72,73). Real-world exposure typically co-occurs with trauma or burns (73-75). Specialized facilities-such as gamma gardens (open-field irradiation facilities equipped with a central radioactive source) or prolonged housing near radioactive sources (60Co or 137Cs)-allow continuous exposure over months (0.05-0.50 Gy/week) (75). These models are suited to test the dose-rate effect (the phenomenon where the biological effectiveness of a radiation dose decreases as the rate of delivery is reduced, primarily due to ongoing cellular repair), providing key data for setting occupational safety thresholds and validating environmental risk models (Table III) (76).

Table III

Methodological paradigms for modeling chronic radiation exposure.

Table III

Methodological paradigms for modeling chronic radiation exposure.

Modeling paradigmMethodology descriptionStrengths (construct validity) Weaknesses/confounders
Whole-body irradiationHomogeneous exposure of the entire organismSimulates systemic fallout/accidents; captures multi-organ failureGI toxicity typically precedes chronic fibrosis; uneven dosimetry
Partial-body irradiationTargeted exposure (such as the thorax) with shieldingSpares bone marrow; allows study of specific organ failure (such as the lung)Lacks systemic immune-endocrine interaction (abscopal effects)
Internal contaminationInjection/ingestion of radionuclides (90Sr, 137Cs)Biologically faithful to nuclear inhalation/ingestion scenariosComplex dosimetry; disposal of radioactive biological waste
Continuous LDR facilityIsodose cages within a γ-source fieldDecouples dose-rate from total dose; mimics occupational exposureResource-intensive; requires dedicated long-term facilities
Combined injuryRadiation + burn/wound/sepsisReplicates real-world catastrophe scenarios (synergistic lethality)High mortality rate complicates study of late-term chronic effects

[i] GI, gastrointestinal; LDR, low-dose-rate.

Biological characteristics and strategic model selection

Phenotypic landscape of CRI

Animal models of CRI are defined by a distinct phenotypic landscape that diverges from acute syndromes (77). These models capture the progressive, multidimensional failure of organ systems driven by the continuous accumulation of sublethal damage and the propagation of SASP (77,78).

Hematopoietic exhaustion and niche remodeling

The hematopoietic system serves as the primary detector of radiation toxicity (79). Under LDR exposure, the pathology shifts from acute ablation to hematopoietic exhaustion (80). Continuous irradiation imposes replicative stress on HSCs, forcing quiescent cells into the cell cycle to maintain homeostasis (81). This chronic cycling leads to telomere erosion and premature senescence, evidenced by the downregulation of stemness markers (c-Kit, CD34) and lineage skewing toward myelopoiesis (82).

Damage extends to the bone marrow microenvironment (83). Radiation damages mesenchymal stromal cells and sinusoidal endothelium, altering the cytokine milieu (decreased CXCL12, increased TGF-β) (84). This hostile niche fails to support HSC retention and promotes adipogenic differentiation, perpetuating a cycle of pancytopenia and immune incompetence akin to human myelodysplastic syndrome (85).

Immunosenescence and the inflammaging loop

Chronic radiation accelerates immunosenescence, characterized by thymic involution and a functional paralysis of the adaptive immune repertoire (86). Peripheral T cell pools become oligoclonal, dominated by exhausted memory phenotypes (PD-1+) with decreased proliferative capacity (87). Simultaneously, the innate immune system enters a state of hyper-activation known as inflammaging (88). Irradiated macrophages activate the NLRP3 inflammasome and the cGAS/STING pathway, secreting a constant stream of pro-inflammatory cytokines (IL-1β, IL-6) (89). This immune dysregulation creates a permissive microenvironment that impairs pathogen clearance and reduces immunosurveillance against neoplastic transformation (90).

Neuroinflammation and synaptic stripping

The CNS exhibits a delayed response to chronic radiation (91). The primary mechanism is neuroinflammation mediated by activated microglia (92). Chronic exposure prevents the turnover of hippocampal neural progenitor cells, leading to deficits in neurogenesis essential for memory consolidation (93). Structurally, this manifests as synaptic stripping, the loss of dendritic spines in the prefrontal cortex (94).

Physiologically, these changes translate into sickness behaviors, such as lethargy, anxiety-like thigmotaxis and cognitive rigidity (95). Furthermore, radiation disrupts the hypothalamic-pituitary-adrenal axis, leading to circadian dysregulation (96). This neuro-immune-endocrine crosstalk highlights the systemic nature of CRI, where CNS injury exacerbates peripheral immune suppression (Fig. 5) (97).

Multilevel assessment hierarchy for
characterizing systemic toxicity and hematopoietic dysfunction in
chronic radiation injury models. Hierarchical strategy for
evaluating the spectrum of radiation-induced injury across
biological dimensions. Basic assessment (systemic health) monitors
macroscopic physiological indicators including body weight
trajectory, nutritional intake and locomotor activity, serving as
early warning signs of functional decline and sickness behavior.
Core assessment (hematological status) surveils the circulating
compartment. Complete blood counts and flow cytometric profiling
are used to identify specific cytopenias and lineage skewing within
immune cell subsets, reflecting bone marrow integrity. Microscopic
assessment (organ architecture) visualizes structural abnormalities
in radiosensitive parenchymal organs (thymus, spleen, kidney).
Histopathological analysis identifies defining morphological
hallmarks, such as organ atrophy, fatty degeneration and the
disruption of cortico-medullary boundaries. Molecular assessment
(mechanistic drivers) assesses underlying biological initiators of
toxicity. Assays for DNA damage (phosphorylated histone H2AX),
oxidative stress and inflammatory cytokine profiles (ELISA) link
observed phenotypic changes to molecular pathology. Collectively,
these integrated assessments provide a high-resolution profile of
exposure-induced dysfunction, bridging molecular mechanisms with
organ-level pathology.

Figure 5

Multilevel assessment hierarchy for characterizing systemic toxicity and hematopoietic dysfunction in chronic radiation injury models. Hierarchical strategy for evaluating the spectrum of radiation-induced injury across biological dimensions. Basic assessment (systemic health) monitors macroscopic physiological indicators including body weight trajectory, nutritional intake and locomotor activity, serving as early warning signs of functional decline and sickness behavior. Core assessment (hematological status) surveils the circulating compartment. Complete blood counts and flow cytometric profiling are used to identify specific cytopenias and lineage skewing within immune cell subsets, reflecting bone marrow integrity. Microscopic assessment (organ architecture) visualizes structural abnormalities in radiosensitive parenchymal organs (thymus, spleen, kidney). Histopathological analysis identifies defining morphological hallmarks, such as organ atrophy, fatty degeneration and the disruption of cortico-medullary boundaries. Molecular assessment (mechanistic drivers) assesses underlying biological initiators of toxicity. Assays for DNA damage (phosphorylated histone H2AX), oxidative stress and inflammatory cytokine profiles (ELISA) link observed phenotypic changes to molecular pathology. Collectively, these integrated assessments provide a high-resolution profile of exposure-induced dysfunction, bridging molecular mechanisms with organ-level pathology.

Critical appraisal: Face vs. construct validity

The utility of any animal model is determined by the balance between its face (phenotypic similarity to humans) and construct validity (mechanistic similarity). Compared with fractionated acute doses, LDR sources more accurately replicate the continuous radiation exposure patterns associated with occupational hazards and environmental contamination (98). LDR models capture the abscopal interactions between organs (such as the kidney-heart axis), allowing for the evaluation of holistic therapeutics rather than single-organ protectants (99). The latency of CRI requires extended housing (6-24 months), increasing costs (100). The confounding factor of aging becomes critical; distinguishing radiation effects from natural geriatric decline requires robust age-matched controls (101). Rodents possess different metabolic rates and DNA repair kinetics than humans (102). For example, the lethal dose required to kill 50% of the population within 30 days) varies, complicating the direct extrapolation of dose-response associations (103).

Strategic model selection for translational relevance

Selecting the appropriate model involves ensuring a match between the specific biological mechanisms under investigation and the inherent physiological attributes of the chosen animal (104).

Interspecies radiosensitivity and physiological homology

Murine models are the workhorse of mechanistic radiobiology (105). C57BL/6 mice are preferred for fibrosis and inflammation studies (Th1-dominant), while BALB/c mice are used for solid tumor induction (Th2-dominant) (106). While useful for molecular genetics, their small size makes localized organ dosimetry challenging (107). Rats offer a larger physiological volume, facilitating surgical interventions and serial blood sampling without inducing hypovolemic stress (108). They are superior for cardiovascular and renal radiation toxicity models due to hemodynamics closer to those of humans (109). Large animal models (canine/porcine/non-human primates) are the gold standard for preclinical validation. Porcine skin and gastrointestinal tracts are anatomically nearly identical to humans, making them ideal for cutaneous and visceral RI models (110). Non-human primates are essential for pivotal studies assessing complex neurobehavioral outcomes and sophisticated immune responses due to high genetic homology (Fig. 6; Table IV) (111).

Strategic alignment map for CRI
animal model selection: Balancing mechanistic utility with
translational relevance. Trade-off between experimental throughput
(genetic utility) and physiological similarity to humans (face
validity) when selecting animal models for CRI research. Mice offer
unparalleled genetic manipulability (transgenic strains) and
high-throughput screening capabilities, serving as the primary
mechanistic workhorse despite lower physiological homology. Rats
provide a balanced platform with larger physiological volumes
suitable for surgical interventions and serial sampling, bridging
the gap between molecular discovery and clinical relevance. Large
animal models (minipigs and NHPs) exhibit high anatomical and
immunological similarities that are key for pivotal preclinical
validation. Minipigs serve as anatomical proxies for cutaneous and
GI injury, while NHPs are the gold standard for assessing complex
neuro-cognitive and immune outcomes. CRI, chronic radiation injury;
GI, gastrointestinal; NHP, non-human primate.

Figure 6

Strategic alignment map for CRI animal model selection: Balancing mechanistic utility with translational relevance. Trade-off between experimental throughput (genetic utility) and physiological similarity to humans (face validity) when selecting animal models for CRI research. Mice offer unparalleled genetic manipulability (transgenic strains) and high-throughput screening capabilities, serving as the primary mechanistic workhorse despite lower physiological homology. Rats provide a balanced platform with larger physiological volumes suitable for surgical interventions and serial sampling, bridging the gap between molecular discovery and clinical relevance. Large animal models (minipigs and NHPs) exhibit high anatomical and immunological similarities that are key for pivotal preclinical validation. Minipigs serve as anatomical proxies for cutaneous and GI injury, while NHPs are the gold standard for assessing complex neuro-cognitive and immune outcomes. CRI, chronic radiation injury; GI, gastrointestinal; NHP, non-human primate.

Table IV

Strategic selection of animal models based on physiological homology and research goal.

Table IV

Strategic selection of animal models based on physiological homology and research goal.

ModelAdvantagesLimitationsRecommended application
Mouse (C57BL/6)High availability of transgenic and knockout strains; Th1-dominant immune responseSmall size limits localized dosimetry; high metabolic rateMechanistic studies (fibrosis), genetic knockout
Mouse (BALB/c)Th2-dominant; high radiosensitivity to solid tumorsProne to radiation-induced pleural effusionCarcinogenesis, solid tumor induction
RatLarger blood volume; hemodynamics similar to humansFewer transgenic strains compared with miceCardiovascular toxicity, renal injury, serial sampling
Minipig Anatomical/physiological homology (skin, GI tract)High cost; specialized housing requiredCutaneous radiation injury, translational GI toxicity
Non-human primateHigh genetic homology (>98%); complex cognitionEthical constraints; prohibitive cost; low throughputNeurobehavioral deficit, FDA animal rule validation

[i] GI, gastrointestinal; NHP, non-human primate; FDA, Food and Drug Administration.

Genetic diversity: Humanized and outbred models

Genetic background dictates the trajectory of chronic injury (112). While inbred strains (C57BL/6) offer reproducibility, they fail to capture human heterogeneity. Strains such as ataxia telangiectasia mutated-deficient or p53-heterozygous mice accelerate the onset of stochastic effects such as carcinogenesis, compressing decades of human latency into months (113). One approach involves using diversity outbred populations to map the genetic architecture of individual radiosensitivity, mimicking the diverse human response more effectively than traditional, genetically homogeneous inbred strains (114). Humanized mouse models, such as the NSG-SGM3 strain [NOD.Cg-Prkdcscid Il2rgtm1Wjl Tg(Prfg-IL3,CSF2,KITLG)1Eav/MloySzJ, which expresses human cytokines to support myeloid engraftment], reconstituted with human HSCs allow the study of human immune responses to chronic radiation in vivo, bridging the translational gap (61,89,115).

Dosimetric and environmental standardization

Precision in CRI modeling requires rigorous dosimetry (116). The definition of chronic varies; thus, reporting the precise dose rate (Gy/h) is as critical as the total accumulated dose (117). Isodose cages ensure that animals receive uniform exposure regardless of movement (118). Furthermore, adherence to ARRIVE guidelines ensures husbandry factors (microbiome, circadian light cycles) are controlled to isolate the radiation variable (119).

Multidimensional validation and construct validity of animal models

The utility of a preclinical model relies on its construct validity, the fidelity with which it recapitulates the human pathological landscape (120). Establishing a standardized validation framework is key, as CRI presents a subtle, non-linear progression distinct from the clear endpoints of acute syndrome (121). A robust validation strategy must triangulate data across physiological performance, hematological integrity, histopathological architecture and molecular signatures, providing systems-level corroboration of radiation toxicity (122).

Physiological and behavioral deep phenotyping

Physiological metrics serve as the frontline indicators of systemic stress and sickness behavior, typically preceding clinically detectable organ failure (123). Unlike the rapid weight loss seen in acute syndrome, chronic radiation induces a wasting phenotype akin to cancer cachexia (124). Longitudinal monitoring typically reveals a blunted growth trajectory or gradual BMI decline, driven by hypothalamic inflammation and sustained catabolic signaling (125). Clinical frailty index, an aggregate score of deficits (alopecia, gait anomalies, grip strength), is a superior metric for quantifying radiation-induced accelerated aging compared with body weight alone (126). Changes in feeding behavior reflect the disruption of the gut-brain axis (127). Radiation-induced mucositis and hypothalamic dysregulation manifest as anorexia and polydipsia (128). A sustained 20-30% decline in caloric intake suggests a transition from transient stress to chronic metabolic dysregulation (129). Quantitative behavioral assays are key for validating CNS injury (130). Automated tracking using open field test and Morris water maze detects decreased locomotor velocity (lethargy), anxiety-like thigmotaxis and cognitive deficits in spatial memory (131). These behavioral phenotypes are associated with hippocampal neuroinflammation and serve as non-invasive biomarkers for successful model induction (132).

Hematological surveillance: Lineage skewing and exhaustion

Peripheral blood analysis provides a dynamic liquid biopsy of the bone marrow microenvironment (133). In CRI models, the validation endpoint is lineage skewing (a persistent imbalance in the production of different hematopoietic cell types that reflects underlying marrow dysfunction and stem cell injury. While acute exposure causes rapid pancytopenia, chronic exposure typically leads to a myeloid-biased output (increased granulocyte/lymphocyte ratio) at the expense of lymphopoiesis, a hallmark of hematopoietic aging (134). Progressive, refractory normocytic anemia (hemoglobin <100 g/l) and elevated red cell distribution width serve as diagnostic criteria for cumulative marrow failure (135). Flow cytometric profiling must assess functional status (136). Validated models demonstrate an inverted CD4/CD8 ratio and the expansion of regulatory T cells (137,138). Upregulation of exhaustion markers on T cells-specifically programmed cell death protein 1 (PD-1) and T-cell immunoglobulin and mucin domain-containing protein 3, along with decreased natural killer cell cytotoxicity, provide definitive immunophenotypic evidence of chronic radiation stress (138).

Histopathological architecture and artificial intelligence (AI)-assisted quantification

Histopathology remains the gold standard for defining irreversible tissue remodeling (139). However, modern validation requires specific staining and digital quantification beyond standard hematoxylin and eosin staining (140). A pathognomonic feature of CRI is the replacement of hematopoietic cellularity with adipose tissue (141). Validated models demonstrate a quantifiable shift in the marrow adipocyte-to-hematopoietic cell ratio (142-144). A hallmark of late-stage CRI is the excessive deposition of extracellular matrix (143). Validation should utilize Masson's trichrome or Sirius Red staining to visualize collagen (144). Immunohistochemistry for α-smooth muscle actin (identifying myofibroblasts) is key for distinguishing active fibrogenesis from static scarring (145). To enhance reproducibility, studies employ AI-driven image analysis algorithms to score fibrosis area fraction and cellularity, eliminating inter-observer variability inherent in manual scoring (145,146).

Molecular signatures: Omics of injury

Phenotypic observation must be corroborated by molecular mechanisms (147). The persistence of DNA double-strand breaks is the molecular footprint of radiation (148). Immunofluorescence quantification of phosphorylated histone H2AX and p53-binding protein 1 (53BP1) foci-two established biomarkers of DNA double-strand breaks-in circulating lymphocytes serves as a biodosimeter (149). Persistent upregulation of repair genes, such as ATM and X-ray repair cross-complementing protein 1, indicates sustained genomic stress and failed repair kinetics (150). Chronic injury is maintained by the SASP (151). Validated models must demonstrate a specific cytokine signature in plasma: Elevated IL-6, IL-1β and MMPs, coupled with reduced IGF-1 (152). This biochemical profile links molecular senescence to macroscopic fibrosis (153). Emerging validation strategies use cell-free DNA and radiation-responsive miRs (miR-150, miR-34a) as minimally invasive markers of tissue damage, offering a translational bridge to human clinical diagnostics (153,154).

A model is considered validated only when it satisfies this multidimensional matrix: Exhibiting the phenotypic frailty, hematological skewing, histological fibrosis and the molecular SASP signature characteristic of human CRI pathology (Fig. 7; Table V) (155).

Multidimensional, closed-loop
framework for establishing construct validity in chronic radiation
injury models. Physiological assessment captures early systemic
manifestations of radiation stress through longitudinal monitoring
of the frailty index (body weight, activity levels, feeding
behavior), distinguishing chronic wasting from acute transient
toxicity. Hematological surveillance provides a dynamic readout of
bone marrow integrity. Analysis focuses on lineage skewing (myeloid
bias) and immunosenescence (T cell exhaustion) via flow cytometry,
rather than simple pancytopenia. Histopathological architecture
defines irreversible tissue remodeling at the microscopic level,
characterized by organ atrophy, marrow adipogenesis and fibrotic
degeneration quantified by digital pathology. Molecular
interrogation establishes the mechanistic root of injury. This
includes the detection of genomic instability (phosphorylated
histone H2AX), oxidative stress and the systemic
senescence-associated secretory phenotype signature (elevated IL-6,
TGF-β) that drives the pathology. Macroscopic phenotypic
abnormalities can be traced back to underlying molecular
dysfunction. This closed-loop assessment confirms that the model
recapitulates the progressive, non-linear pathology of human
chronic radiation exposure.

Figure 7

Multidimensional, closed-loop framework for establishing construct validity in chronic radiation injury models. Physiological assessment captures early systemic manifestations of radiation stress through longitudinal monitoring of the frailty index (body weight, activity levels, feeding behavior), distinguishing chronic wasting from acute transient toxicity. Hematological surveillance provides a dynamic readout of bone marrow integrity. Analysis focuses on lineage skewing (myeloid bias) and immunosenescence (T cell exhaustion) via flow cytometry, rather than simple pancytopenia. Histopathological architecture defines irreversible tissue remodeling at the microscopic level, characterized by organ atrophy, marrow adipogenesis and fibrotic degeneration quantified by digital pathology. Molecular interrogation establishes the mechanistic root of injury. This includes the detection of genomic instability (phosphorylated histone H2AX), oxidative stress and the systemic senescence-associated secretory phenotype signature (elevated IL-6, TGF-β) that drives the pathology. Macroscopic phenotypic abnormalities can be traced back to underlying molecular dysfunction. This closed-loop assessment confirms that the model recapitulates the progressive, non-linear pathology of human chronic radiation exposure.

Table V

Multidimensional validation matrix for establishing CRI models.

Table V

Multidimensional validation matrix for establishing CRI models.

A, Physiological
Validation parameterAssessment method/metricExpected pathological shift (CRI phenotype)
Frailty and metabolismFI scoreIncreased FI score; wasting phenotype (cachexia)
NeurobehavioralOpen-field/water mazeDecreased locomotor velocity; spatial memory deficit

B, Hematological

Validation parameterAssessment method/metricExpected pathological shift (CRI phenotype)

Lineage integrityCBC and flow cytometryMyeloid skewing (increased granulocytes, decreased lymphocytes); anemia
ImmunosenescenceT cell exhaustion markers (PD-1 and Tim-3)CD4/CD8 inversion; PD-1+ and Tim-3+ upregulation

C, Histological

Validation parameterAssessment method/metricExpected pathological shift (CRI phenotype)

Tissue architectureMasson's trichrome/Sirius RedIncreased collagen volume fraction (fibrosis)
Marrow nicheAdipocyte count (H&E)Fatty marrow replacement of cellularity

D, Molecular

Validation parameterAssessment method/metricExpected pathological shift (CRI phenotype)

Genomic instabilityγ-H2AX/53BP1 fociPersistent foci in circulating lymphocytes (repair failure)
SASP signatureELISA/multiplex immunoassayElevated IL-6, IL-1β, MMPs; decreased IGF-1

[i] FI, frailty index; CBC, complete blood count; H&E, hematoxylin and eosin; SASP, senescence-associated secretory phenotype; IGF-1, insulin-like growth factor 1; 53BP1, p53-binding protein 1; CRI, chronic radiation injury; Tim-3, T-cell immunoglobulin and mucin domain-containing protein 3.

Translational paradigms: From mechanistic discovery to clinical countermeasure

Animal models of CRI serve as the operational bridge between in vitro mechanistic data and human clinical application (156,157). Because efficacy testing of radioprotective agents in humans is ethically precluded, these models are typically the primary source of evidence for regulatory approval under US. Food and Drug Administration (FDA) 'Animal Rule, which allows for the approval of new drugs based on animal efficacy data when human clinical trials are ethically or logistically unfeasible (Table VI) (157).

Table VI

Alignment of CRI animal models with FDA animal rule criteria.

Table VI

Alignment of CRI animal models with FDA animal rule criteria.

FDA criterionRequirement for CRI modelsChallenges in modeling
Mechanism of toxicityPathophysiology of the radiation injury in the animal model must be well-understood and sufficiently overlap with the human disease mechanism.Differentiating between specific direct radiation toxicity and natural aging-associated decline in long-duration studies requires robust age-matched controls
Effect predictionEffect of the countermeasure in the animal species must be demonstrated to predict the response in humansSpecies-specific differences in immune surveillance and DNA repair kinetics (mice repair DNA faster than humans) complicate direct translation of efficacy
Dose selectionStudy must provide sufficient pharmacokinetic and pharmacodynamic data to select an effective dose for humansEstablishing a human equivalent dose for chronic LDR exposure is difficult due to the variability of human exposure scenarios (spaceflight vs. occupational).
GLPStudies must be conducted under rigorous GLP conditions to ensure data integrity and quality assuranceLong-duration studies (1-2 years) face high risk of attrition (animal death from non-radiation causes), which can compromise statistical power and GLP compliance

[i] CRI, chronic radiation injury; FDA, Food and Drug Administration; LDR, low-dose-rate; GLP, good laboratory practice.

Unraveling molecular networks and epigenetic landscapes

Animal models of chronic radiation injury allow the mapping of complex signal transduction networks that drive chronic pathology (158,159). Chronic LDR exposure triggers a senescence-like arrest distinct from acute apoptosis (159). Models have been pivotal in identifying the p53-p21 axis as the gatekeeper of this arrest and the subsequent activation of NF-κB, which drives the SASP (160,161). This demonstrates how irradiated cells survive but remain metabolically active, propagating inflammation to bystander tissue (161). epigenetic scars (persistent, long-term alterations in the epigenome (such as stable changes in DNA methylation patterns) that continue to drive abnormal gene expression long after the initial radiation exposure has ceased (162,163). High-throughput bisulfite sequencing in chronically exposed rodents has identified persistent hypermethylation of tumor suppressor promoters (p16INK4a) and global hypomethylation of retrotransposons (163). Integrative multi-omics (transcriptomics + metabolomics) has mapped the dysregulation of the tricarboxylic acid cycle and fatty acid oxidation, providing a systems-level view of radiation-induced metabolic rewiring (164).

Preclinical development of MCMs

The primary industrial application of animal models of chronic radiation injury is the rigorous screening of MCMs, distinguishing between prophylactic agents (pre-exposure) and mitigators (post-exposure) (165). In the screening phase, models quantify the dose reduction factor of candidate agents (166). Effective agents must demonstrate significant preservation of the HSC pool and a reduction in marrow adiposity (167). Research has moved beyond free radical scavengers to targeted therapy (168). Models are validating senolytics (navitoclax, quercetin) that selectively eliminate senescent cells to rejuvenate tissue (168,169). Furthermore, pharmacodynamic studies optimize dosing to mitigate DEARE, ensuring that agents do not interfere with DNA repair in a manner that promotes secondary carcinogenesis (Table VII) (57,170).

Table VII

Translational frontiers: Therapeutic targets and biomarkers for precision radioprotection.

Table VII

Translational frontiers: Therapeutic targets and biomarkers for precision radioprotection.

Pathological driverMolecular targetCandidate diagnostic biomarkerIntervention
Senescence (SASP) p16INK4a, p21Cip1, NF-κBPlasma IL-6, TNF-α, GDF-15Senolytics (navitoclax, quercetin) to clear senescent cells
Oxidative stressNrf2/ARE pathway, mitochondriaUrinary 8-oxo-dG, lipid peroxides (MDA)Mito-protectants; microbiome modulation (probiotics)
Fibrotic remodelingTGF-β1/Smad signalingCirculating pro-collagen peptides, miR-21Anti-fibrotics; epigenetic modifiers (HDAC inhibitors)
HSC exhaustionc-Kit, CXCL12Circulating CD34+ count, miR-150Niche rejuvenation; extracellular vesicle therapy
Genomic instabilityDNA repair (ATM, PARP)Cell-free DNA concentrationPrecision radioprotection guided by genetic screening (DO mice)

[i] SASP, senescence-associated secretory phenotype; GDF-15, growth differentiation factor 15; MDA, malondialdehyde; HDAC, histone deacetylase; HSC, hematopoietic stem cell; DO, diversity outbred; miR, microRNA; ATM, Ataxia-Telangiectasia Mutated kinase.

Integrated protection: Lifestyle and metabolic interventions

Beyond pharmaceuticals, models are key for testing holistic strategies suitable for long-term occupational exposure (171). Comparative studies demonstrate that dietary polyphenols and probiotics remodel the gut microbiome, which is often dysbiotic after radiation (171,172). This gut-bone marrow axis modulation enhances Nrf2-ARE signaling, the master regulator of antioxidant defense, thereby decreasing systemic oxidative stress (malondialdehyde levels) (173). Controlled exercise studies reveal that mechanical loading upregulates AMPK signaling, promoting mitochondrial biogenesis (174,175). This counteracts radiation-induced sarcopenia and fatigue, offering a non-pharmacological strategy for astronauts or nuclear workers (175).

Risk assessment: Adverse outcome pathways (AOPs) and the exposome

Animal models provide the empirical data necessary to construct AOPs, which link a molecular initiating event (such as DNA oxidation) to an adverse outcome (such as fibrosis). By exposing large cohorts to low-dose rates, researchers test the validity of the LNT model vs. hormesis (adaptive response) (176,177). This data is critical for setting occupational limits (such as for interventional cardiologists) (178). Real-world risk involves combined stressors (179). Advanced models simulate the exposome by co-exposing animals to radiation in the presence of heavy metals (such as uranium mining) or microgravity (spaceflight) (178,179). These studies reveal synergistic toxicities that single-stressor models miss, refining ecological risk assessments (179,180).

Translational perspective: Toward precision radioprotection

The future of CRI animal models lies in precision radioprotection (181). By using diversity outbred mice that reflect human genetic heterogeneity, researchers can identify genetic polymorphisms (in ATM or TGF-β) that confer individual radiosensitivity (182). Furthermore, the integration of spatial transcriptomics allows the mapping of radiation injury at single-cell resolution in situ, identifying rare, radio-resistant SC subpopulations that drive tissue regeneration or fibrosis (183,184). These refined models may facilitate the development of personalized radiation health passports, guiding individual risk management based on genetic and metabolic profiles (183-185).

Future outlook: Precision radiobiology

CR modeling is on the precipice of a technological revolution (186). Animal models are key for bridging the translational gap between laboratory-based basic research and clinical implementation, where many promising candidates fail due to unforeseen toxicities or lack of efficacy, yet the traditional black box approach, exposing animals and waiting for phenotypic outcomes, is being superseded by systems biology and engineering (187). The future lies in the convergence of high-fidelity in vivo modeling with high-resolution omics and AI, offering opportunities to rewrite the paradigms of radiation protection and therapy (Fig. 8) (188).

Translational roadmap: Bridging
preclinical modeling and precision radioprotection. Validated
animal models (minipigs, humanized mice) serve as the operational
core for screening medical countermeasures. These high-fidelity
systems provide efficacy data required by the FDA animal rule,
bypassing the ethical constraints of human testing. Integration of
spatial transcriptomics and artificial intelligence-driven deep
phenotyping enhances the sensitivity of these models, allowing
detection of subtle pathologies and the mapping of mechanism-based
targets (such as senolytics). By leveraging digital twins (in
silico models constructed from large multi-omics datasets),
researchers can simulate long-term outcomes and design personalized
radiation health passports for diverse risk groups, ranging from
nuclear workers to deep-space astronauts. FDA, Food and Drug
Administration; LDR, low-dose-rate.

Figure 8

Translational roadmap: Bridging preclinical modeling and precision radioprotection. Validated animal models (minipigs, humanized mice) serve as the operational core for screening medical countermeasures. These high-fidelity systems provide efficacy data required by the FDA animal rule, bypassing the ethical constraints of human testing. Integration of spatial transcriptomics and artificial intelligence-driven deep phenotyping enhances the sensitivity of these models, allowing detection of subtle pathologies and the mapping of mechanism-based targets (such as senolytics). By leveraging digital twins (in silico models constructed from large multi-omics datasets), researchers can simulate long-term outcomes and design personalized radiation health passports for diverse risk groups, ranging from nuclear workers to deep-space astronauts. FDA, Food and Drug Administration; LDR, low-dose-rate.

From bulk analysis to spatiotemporal resolution

Future mechanistic inquiry will transcend bulk tissue analysis to identify the spatiotemporal dynamics of injury (189). By integrating single-cell RNA sequencing with spatial transcriptomics, researchers may move beyond merely identifying which cells are damaged to understanding where they are located relative to the niche (190). This will map the neighborhood effects (how a senescent stromal cell spatially corrupts adjacent stem cells via SASP) (191). Advanced genetic fate-mapping will unveil the clonal trajectories of surviving cells, distinguishing between regenerative and pre-leukemic clones (192). This high-resolution mapping may identify specific molecular switch points (such as epigenetic loci) that determine whether a tissue undergoes repair or irreversible fibrosis (193).

Next-generation therapeutics: Senolytics and cell-free regenerative medicine

The therapeutic landscape is shifting from symptom management to disease modification (194). A notable frontier is the targeting of senescent cells (195). Future models will rigorously validate senolytics (drugs that induce apoptosis in senescent cells) and senomorphics (agents that suppress SASP without killing the cell) (196). The goal is to restore the irradiated microenvironment to a pre-exposure state (197). While SC therapy holds promise, the future may lie in extracellular vesicles (EVs) and exosomes (198). Derived from mesenchymal SCs, these cell-free cargoes carry regenerative miRs and proteins with lower immunogenicity and tumorigenic risk than live cells (199). Models optimize engineered EVs loaded with specific radioprotective cargos (mitochondria or mRNA) for targeted delivery (199,200). Clustered regularly interspaced short palindromic repeats-associated protein 9 and base editing in vivo will evolve toward correcting radiation-induced mutations in somatic tissue or epigenetically silencing pro-fibrotic genes (TGF-β) via modifiable promotors (201).

AI: Dosimetry and digital twins

AI may transform experimental design and risk assessment (202). Machine learning algorithms may replace manual observation, detecting subtle neurobehavioral deficits (gait asymmetry, micro-tremors) invisible to the human eye, increasing the sensitivity of chronic injury models (203). By integrating large omics datasets from animal studies, researchers aim to create digital twins of radiation injury (204). These in silico models can simulate decades of chronic exposure in seconds, predicting long-term outcomes and screening millions of drug candidates virtually before an animal is treated (205). This may accelerate MCM discovery.

Humanized avatars and microphysiological systems (MPSs)

Hybrid systems may overcome the interspecies gap (206). The use of immunodeficient mice reconstituted with human hematopoietic and immune systems (MISTRG mice) may become standard for assessing human-specific immune responses to chronic radiation (207). Integration of MPSs (organs-on-chips) with animal validation may enable transition from high-throughput in vitro mechanistic screening to definitive in vivo validation (208). MPS screen for human-specific toxicity mechanisms, while the animal model confirms systemic safety (209). This aligns with the replacement, reduction and refinement principle while maximizing translational relevance for diverse populations, from astronauts to nuclear workers (210).

While the present review provides a methodological framework for CRI modeling, limitations must be acknowledged. First, due to the logistical, ethical and financial constraints of conducting life-span studies in large animal models (such as non-human primates), the majority of the mechanistic data, particularly regarding SASP and inflammaging, is derived from murine models. Extrapolating these rodent-derived mechanisms to humans requires extreme caution, given the species-specific differences in telomere dynamics, metabolic rate and immune surveillance. Second, experimental models traditionally isolate radiation as a single stressor to maintain controlled variables. However, real-world human exposure (spaceflight or nuclear accidents) typically involves complex exposome interactions, such as concomitant exposure to heavy metals, psychological stress or microgravity, which may alter the CRI trajectory. Finally, spatial multi-omics and AI-driven digital twins are currently in their early developmental or conceptual phases and require empirical validation before widespread translational application.

In conclusion, CR animal models are transitioning from descriptive pathology to predictive precision medicine (211). This may facilitate development of robust, personalized defenses against adverse health effects of ionizing radiation (212).

Availability of data and materials

Not applicable.

Authors' contributions

ZX, XiaodongL, ChunhuiY, LW, JM, QLiu, CL, QLi, YH, JW, ChengzhuoY, FS, ChaoY, MW, BY, YL, QH, LZ, XuemeiL and XiaobingL wrote the manuscript and constructed figures. XuemeiL and XiaobingL edited the manuscript and supervised the study. Data authentication is not applicable. All authors have read and approved the final manuscript.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Acknowledgements

The authors would like to thank Professor Sheng Li (Chongqing Medical and Pharmaceutical College, Chongqing, China) for providing expert guidance on the conceptual framework and feedback during the preparation of the manuscript.

Funding

The present study was supported by 2023 Chongqing Medical Scientific Research Project (Joint Project of Chongqing Health Commission and Science and Technology Bureau; grant no. 2023GGXM006), Joint Project of Chongqing Health Commission and Science and Technology Bureau (Joint Key Laboratory Open Project) (grant no. 2026KFXM051), Natural Science Foundation of Chongqing (grant no. CSTB2025NSCO-GPX1116), 2026 Chongqing Municipal Health Commission Traditional Chinese Medicine Research Project (grant no. 2026WSJK158), Technological Innovation Project of Shapingba District, Chongqing (grant no. 2025016), 2024 Scientific research Project of Chongqing Medical and Pharmaceutical College (grant no. ygzrc2024101), Chongqing Municipal Education Commission Youth Project (grant nos. KJQN202302811, KJQN202502819 and KJQN202402821), 2024 Chongqing Medical and Pharmaceutical College Innovation Research Group Project (grant no. ygz2024401), Science and Health Joint Medical Research Project of Shapingba District, Chongqing (grant no. 2024SQKWLHMS051), 2025 Teaching Research & Reform Project of Chongqing Medical and Pharmaceutical College (grant no. YGZJG2025322), The Key Laboratory Project of Chongqing Medical and Pharmaceutical College (grant no. YGZPT2025101), 2025 Scientific Research Project of Chongqing Medical and Pharmaceutical College (grant no. YGZZK2025116), 2025 Technological Innovation Project of Shapingba District, Chongqing (grant no. 2025031) and Joint project of Chongqing Health Commission and Science and Technology Bureau (grant no. 2024MSXM115).

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Spandidos Publications style
Xi Z, Li X, Yang C, Wang L, Mao J, Liu Q, Liu C, Li Q, Hou Y, Wan J, Wan J, et al: Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review). Int J Mol Med 58: 192, 2026.
APA
Xi, Z., Li, X., Yang, C., Wang, L., Mao, J., Liu, Q. ... Li, X. (2026). Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review). International Journal of Molecular Medicine, 58, 192. https://doi.org/10.3892/ijmm.2026.5863
MLA
Xi, Z., Li, X., Yang, C., Wang, L., Mao, J., Liu, Q., Liu, C., Li, Q., Hou, Y., Wan, J., Yang, C., Sun, F., Yu, C., Wang, M., Yuan, B., Liu, Y., Hu, Q., Zhang, L., Li, X., Li, X."Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review)". International Journal of Molecular Medicine 58.1 (2026): 192.
Chicago
Xi, Z., Li, X., Yang, C., Wang, L., Mao, J., Liu, Q., Liu, C., Li, Q., Hou, Y., Wan, J., Yang, C., Sun, F., Yu, C., Wang, M., Yuan, B., Liu, Y., Hu, Q., Zhang, L., Li, X., Li, X."Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review)". International Journal of Molecular Medicine 58, no. 1 (2026): 192. https://doi.org/10.3892/ijmm.2026.5863
Copy and paste a formatted citation
x
Spandidos Publications style
Xi Z, Li X, Yang C, Wang L, Mao J, Liu Q, Liu C, Li Q, Hou Y, Wan J, Wan J, et al: Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review). Int J Mol Med 58: 192, 2026.
APA
Xi, Z., Li, X., Yang, C., Wang, L., Mao, J., Liu, Q. ... Li, X. (2026). Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review). International Journal of Molecular Medicine, 58, 192. https://doi.org/10.3892/ijmm.2026.5863
MLA
Xi, Z., Li, X., Yang, C., Wang, L., Mao, J., Liu, Q., Liu, C., Li, Q., Hou, Y., Wan, J., Yang, C., Sun, F., Yu, C., Wang, M., Yuan, B., Liu, Y., Hu, Q., Zhang, L., Li, X., Li, X."Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review)". International Journal of Molecular Medicine 58.1 (2026): 192.
Chicago
Xi, Z., Li, X., Yang, C., Wang, L., Mao, J., Liu, Q., Liu, C., Li, Q., Hou, Y., Wan, J., Yang, C., Sun, F., Yu, C., Wang, M., Yuan, B., Liu, Y., Hu, Q., Zhang, L., Li, X., Li, X."Unraveling the molecular landscape of chronic radiation injury: From oxidative stress signaling to translational modeling (Review)". International Journal of Molecular Medicine 58, no. 1 (2026): 192. https://doi.org/10.3892/ijmm.2026.5863
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