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Diabetic kidney disease (DKD), recognized as a severe chronic microvascular complication of diabetes, has emerged as the leading cause of chronic kidney disease, surpassing chronic glomerulonephritis in incidence (1). Clinically, DKD is characterized by progressive proteinuria, edema and hypertension. Pathologically, it affects multiple renal structures, including glomeruli, tubules and microvessels, ultimately culminating in end-stage renal disease (2). DKD diagnosis is performed through biopsy; however, the filtration rate and albumin excretion rate enable initial identification (3). Notably, accumulating evidence has underscored pre-biopsy biomarker screening as important for curbing disease progression (4–6). Therefore, the identification of important therapeutic targets and molecular biomarkers in early-stage DKD holds notable clinical implications. Shifting away from established DKD research models, the present review identified endoplasmic reticulum (ER) stress (ERS) as a prospective therapeutic focus, including a systematic dissection of its role in disease progression and a thorough re-evaluation of herbal treatment approaches.
The ER, a notable cellular organelle, orchestrates polypeptide folding and protein processing, functions that underpin its roles in calcium storage and regulation, lipid metabolism, and glucose homeostasis (7). ERS can be initiated by two distinct mechanisms: i) Endogenous factors such as cancer and neurodegenerative diseases, which disrupt cellular processes (8); and ii) exogenous stressors such as microenvironmental alterations and chemical insults that induce ERS responses (9). Microenvironmental perturbations and diverse stressors, including metabolic dysregulation, cancer-associated stress, drug toxicity and radiation, elicit the unfolded protein response (UPR) in the ER, a hallmark of ERS (10). ERS serves as one of the fundamental mechanisms underlying metabolic dysfunction across renal organs and tissues. As a trophic signaling hub in metabolic disorders such as obesity and type 2 diabetes, the ER integrates inflammation, autophagy and apoptosis pathways, while modulating cytokine release (11). ERS induces dynamic changes in the expression of inositol-requiring enzyme 1α (IRE1α), PKR-like ER kinase (PERK), activating transcription factor (ATF)6 and glucose-regulated protein (GRP)78/binding immunoglobulin protein (BiP). Following energy metabolism fluctuations, these metabolism sensors (IRE1α, PERK and ATF6) dissociate from GRP78/BiP, triggering increased metabolic activity and protective responses such as autophagy (10). Failure to restore homeostasis via translational arrest and chaperone upregulation leads to the initiation of CHOP-dependent apoptosis, a determinant of stressed cell fate (2,12).
ERS-related protective responses activate three stress protein pathways. First, starting with the IRE1α-spliced X-box binding protein 1 (XBP1s) pathway, phosphorylated (p-)IRE1α dimerization catalyzes XBP1 mRNA splicing, generating nuclear-translocated XBP1 that activates ER-associated degradation (ERAD) or promotes mRNA decay during adaptive UPR. Concurrently, tumor necrosis factor receptor-associated factor 2 (TRAF2)-mediated JNK activation contributes to dual-function UPR signaling, balancing adaptive and apoptotic responses. Second, p-PERK dimerization in the PERK/eukaryotic initiation factor 2 (eIF2) pathway drives eIF2 phosphorylation, which enhances ATF4 translation to elicit adaptive UPR. During severe ERS, ATF4 induces CHOP expression, activating the apoptotic arm of the UPR. Third, in the ATF6 axis, chaperone dissociation of GRP78/BiP promotes Golgi trafficking, where proteolytic processing generates ATF6 p50. This nuclear effector drives the adaptive UPR via chaperone and foldase transcription or the apoptotic UPR via ERAD activation (13).
Collectively, the IRE1α/XBP1s, PERK/eIF2 and ATF6 pathways balance ERS-induced survival and apoptosis through UPR modulation: Moderate UPR restores homeostasis, while persistent ERS activates apoptotic signals such as caspase-12, leading to cell death (Fig. 1) (8–14).
Preclinical and clinical investigations have consistently revealed ERS marker upregulation in renal tissues of patients with DKD and relevant animal models (15–17). Pathological changes in DKD tend to start early with thickening of the basement membrane, gradually spreading to glomeruli, microvessels and tubules. By contrast, changes in glomerular hyaluronan appear in the late stages of DKD (18,19). Persistent urinary protein abnormalities stem predominantly from four sources: i) Renal filtration barrier defects, including those affecting the basement membrane, podocytes and associated cells (20); ii) damage across renal tubular segments (21); iii) renal interstitial functional impairment (22); and iv) immune cell population dysregulation (23). In conclusion, renal histopathology reveals that ERS impacts DKD in three notable manners: Glomerular filtration membrane injury, renal tubular reabsorptive dysfunction and renal interstitial remodeling with immune cell dysregulation (24).
Studies in DKD model mice have revealed that ERS contributes to glomerular injury, as demonstrated by increased GRP78/caspase-12 expression and reduced Bcl-2 levels (25–27) Notably, genetic deletion of ER protein 44 in db/db mice upregulated ATF6, XBP1 and CHOP, further indicating ERS involvement in glomerular filtration membrane injury (28). Composed of endothelial cells, basement membrane and podocytes, the glomerular filtration membrane is important for blood filtration. Damage to these components drives early DKD progression and proteinuria (27). Surface-bound GRP78 drives extracellular matrix (ECM) accumulation through PI3K/Akt activation, while the AMP-activated protein kinase (AMPK)/mTOR pathway promotes late-stage PERK/CHOP upregulation to enhance autophagy, and the IRE1/NF-κB pathway mediates ERS-induced inflammation in podocytes (29–31). Compared with individuals without DKD, renal biopsy analyses of patients with DKD have revealed increased GRP78 and caspase-12 expression in human glomerular podocytes (28,32). The elevation of ATF6 and PERK in human podocytes triggers lipid metabolism disorders and inflammation, which are suppressed by JNK-mediated insulin activity (33). Mechanistically, the high glucose-induced elevation of PERK, ATF6 and IRE1α in rat podocytes is linked to protein arginine methyltransferase 1 (PRMT1) (34). Concurrently, the activation of XBP1s in glomerular mesangial cells triggers histone-lysine N-methyltransferase SETD7-mediated histone methylation, leading to the upregulation of DKD-associated monocyte chemoattractant protein 1 (35,36). These findings indicate that ERS influences the expression of UPR-induced transcription factors, which in turn contribute to fibrotic and inflammatory pathological changes, thereby regulating the balance between adaptive and apoptotic states in podocytes.
The depletion of terminally differentiated podocytes, which form the glomerular filtration barrier, is characteristic of chronic kidney diseases, including DKD. Numerous studies have revealed an association between ERS and podocyte injury in DKD, as ERS markers are upregulated in human and murine podocytes exposed to high glucose; this process is induced by the dysregulation of hyperglycemia, lipid metabolism and insulin signaling (37,38). In mouse podocytes, the accumulation of advanced glycation end-products (AGEs) and high-glucose exposure activate GRP78, CHOP and caspase-12 through distinct pathways, ultimately driving podocyte apoptotic processes (39). PERK-eIF2α activation induces CHOP-mediated podocyte apoptosis, and PERK phosphorylation triggers a CHOP-reticulon 1A (RTN1A) positive feedback loop for synergistic apoptotic enhancement (40). Dysfunction in the insulin PI3K/Akt pathway may underlie GRP78/CHOP-mediated ERS and podocyte apoptosis. Reduced activity of PTEN, a downstream inhibitory regulator, exacerbates ERS, while MEK/ERK signaling counteracts this pathological effect (41). The GRP78-mediated modulation of the MEK kinase 1 (MEKK1)/JNK signaling cascade induces podocyte apoptosis through MEKK1-dependent Ser280 phosphorylation (42).
The ERAD pathway is a specialized mechanism within the ER that employs the ubiquitin-proteasome system to degrade misfolded or aberrantly modified proteins, serving an important role in eliminating these faulty proteins from cells (43). Derlin-2 expression is elevated in podocytes from patients with DKD biopsies, triggering ERAD to sustain the cellular balance (44,45). Similarly, ERS serves an important role in balancing podocyte survival and apoptosis through autophagy, given that compared with DKD, podocytes inherently exhibit a higher basal autophagic activity (46) High glucose levels increase eIF2α, CHOP, caspase-3/12, GRP78, ATF6 and PERK levels in podocytes through the inhibition of autophagy, whereas sarcoendoplasmic reticulum calcium-ATPase (SERCA)2b-mediated ERS attenuation is associated with AMPKα-induced autophagy (46,47). The intercellular transmission of ERS signals, coupled with podocyte-intraglomerular cell interactions, suppresses ERAD through derlin-2 downregulation, inducing podocyte apoptosis in DKD (48). Additional evidence has shown that GRP78/CHOP activation in endothelial cells drives epithelial-mesenchymal transition (EMT) (49), implying a potential role for glomerular endothelial cells in DKD pathogenesis, although the underlying mechanisms remain ambiguous.
UPR-activated transcription factors drive fibrosis and inflammation in glomerular podocytes at the early stage of diabetic kidney injury. Three ERS pathways collectively influence disease progression, including: i) Regulation of podocyte apoptosis through the PI3K/Akt, PTEN and MEK/ERK signaling pathways; ii) maintenance of cellular homeostasis through the activation of ERAD; and iii) modulation of podocyte autophagy via AMPK (50,51). In addition, key ERS factors also contribute to the DKD process by affecting intraglomerular mesangial cells and podocytes (52).
Composed of Henle's loop, proximal and distal tubules and collecting ducts, renal tubules reabsorb small molecules and lipids, with their epithelium serving as a key DKD-targeted cell type susceptible to injury (53,54). Extensive research has established that ERS contributes to DKD-related renal tubular injury, as evidenced by the upregulation of differential ERS markers in human biopsies, animal tissues and in vitro models (15,55–57). This process is driven by the AGE/receptor for AGEs (RAGE) axis, PRMT1 and histone H4 deacetylation (15,58,59), while it is alleviated by calbindin-D28k, transmembrane BAX inhibitor motif-containing protein 6, sestrin 2 and dapagliflozin (60,61). Renal tubular ERS markers (notably including GRP78) can modulate the autophagic processes and drive inflammatory responses by regulating mitochondrial function and reactive oxygen species (ROS) generation (62,63). Saturated fatty acid-associated factors, such as carbohydrate-responsive element-binding protein, cholesterol and palmitic acid (PA), promote ERS marker upregulation in renal tubular cells, causing lipid accumulation and apoptotic cell death (64,65). Therefore, the comprehensive role of ERS in renal tubules is closely intertwined with autophagy, inflammation and lipid peroxidation.
In the renal tubular system, the proximal tubule reabsorbs glucose, amino acids, HCO3−, Cl− and Na+, while secreting H+. By contrast, the distal tubule and collecting ducts mainly mediate Na+ and water reabsorption alongside K+ secretion. The proximal and distal tubule of the kidney functional distinction partially explain the structural variations in ERS signaling, with GRP78-governed ATF4/p16/p21 axes promoting AGE/RAGE-driven premature cellular senescence in mouse proximal tubular cells (66). GRP78 and protein disulfide isomerase exhibit distinct regulatory dynamics between proximal and distal tubules, varying across early and late stages of diabetes-induced ERS. Early-stage diabetes triggers PERK activation, while late-stage disease promotes ATF6 activation in renal tubules, resulting in stage-dependent differential ERS responses between proximal and distal segments in DKD (67).
ERS notably regulates renal cell function by suppressing inflammation, inhibiting abnormal proliferation and fibrosis, and combating oxidative damage through the precise modulation of DKD pathways, including the PERK/CHOP and caspase-12 pathways (53,68,69). The mechanistic exploration of ERS in DKD pathway regulation sheds light on DKD pathogenesis and facilitates the identification of novel therapeutic targets (Fig. 2).
The PERK/CHOP pathway regulates ERS and contributes to DKD. The core aspects of the PERK/CHOP pathway comprise the following mechanisms: Initially, ERS is triggered when high glucose levels, oxidative stress and inflammation lead to misfolded protein accumulation in the ER, prompting GRP78/BiP dissociation from PERK and subsequent kinase activation (70). Subsequently, the PERK/eIF2α/ATF4 axis is activated; PERK phosphorylates eIF2α, globally inhibiting translation to reduce ERS burden. Simultaneously, p-eIF2α selectively promotes ATF4 translation, leading to CHOP expression (71) Finally, CHOP-mediated apoptotic signaling occurs (72) CHOP, a transcription factor, upregulates pro-apoptotic genes, such as Bcl-2-interacting mediator of cell death (Bim), p53 upregulated modulator of apoptosis and Bax, and downregulates Bcl-2, ultimately inducing apoptosis (73).
The PERK/CHOP pathway mediates DKD podocyte injury through high glucose-activated PERK/eIF2α/ATF4/CHOP signaling, inducing apoptosis, foot process effacement, proteinuria and glomerulosclerosis, which are exacerbated by pathway hyperactivation (74). The PERK/CHOP pathway drives mesangial cell proliferation, fibrosis and ECM deposition, mediated via pathways such as the TGF-β1/connective tissue growth factor pathway, in DKD, additionally serving as a central mediator of proteinuria and glomerulosclerosis (75). In DKD, the CHOP pathway mediates renal tubular injury. High glucose-induced ERS promotes tubular apoptosis through the PERK/CHOP axis and activates pro-inflammatory cytokines such as IL-6 and TNF-α to exacerbate renal interstitial inflammation (68). Renal tubulointerstitial fibrosis is an important step in the progression of DKD to end-stage renal disease. Sustained PERK activation enhances ATF4 transcription to upregulate CHOP, which downregulates Bcl-2 and promotes apoptosis through ROS production and ATP depletion (76). Concurrently, CHOP triggers growth arrest and DNA-damage-inducible 34 activation to facilitate eIF2α dephosphorylation, a negative feedback mechanism that restores transiently-arrested protein synthesis in the PERK pathway (77).
The PERK/CHOP regulatory axis balances adaptive and apoptotic responses to ERS through integrated positive and negative feedback mechanisms (78). PERK and its downstream effector CHOP exhibit segment-specific regulation across different regions of the renal tubule. Renal tubular cells secrete CHOP-induced fibronectin, driving mesenchymal fibrosis in DKD, a process implying that PERK/CHOP signaling controls the synthesis and release of ECM proteins in these cells (79). The RTN1A/PERK/CHOP positive feedback loop exacerbates ERS-induced podocyte apoptosis, highlighting the dual role of the PERK/CHOP pathway in maintaining ERS balance and promoting pathological cell death (80).
Caspase-12 acts as a key executor of apoptotic signaling, with its activation closely linked to ERS-induced cell death (81). Upon ER misfolded protein accumulation, for example, due to high blood glucose levels, oxidative stress or calcium dyshomeostasis, GRP78/BiP dissociates from ER membrane sensors such as PERK, IRE1 and ATF6 to bind misfolded proteins, triggering the activation of caspase-12 as a downstream responder to ERS signals (82,83). In non-stressed cells, GRP78 associates with pro-caspase-12 to suppress its activity. During ERS, GRP78 dissociation exposes the active site for proteolytic processing by upstream enzymes, including IRE1α and calpain, generating active caspase-12 (p35/p12 subunits) that cleaves caspase-3 to initiate apoptosis (84,85).
In patients with DKD, high glucose induces ERS, which activates caspase-12 and promotes the apoptosis of podocytes and tubular epithelial cells, accelerating proteinuria and renal interstitial fibrosis (86). In the DKD mouse model, CHOP overexpression upregulates caspase-12 to promote apoptosis, whereas caspase-12 inhibition attenuates high glucose-induced renal cell injury (87). ERS also induces calcium dyshomeostasis and mitochondrial calcium overload, indirectly activating the mitochondrial apoptotic pathway via the ER-mitochondrial axis (88). ER-released Ca2+ activates peripheral calpains, prompting their translocation to the cytoplasm. Calpain activation results in translocation to the ER outer membrane, triggering caspase-7 translocation and activation (87,89). Both factors process pro-caspase-12 into an active form that translocates to the cytoplasm, activates caspase-9 and −3 through the cytochrome c (CytC)-independent pathway and induces apoptosis (90). In addition, the IRE1α-TRAF2 complex activates caspase-12 through calmodulin decarboxylase, thereby initiating the caspase-mediated apoptotic pathway (91). Caspase-12-dependent signaling contributes to severe podocyte and tubular cell injury in DKD. Therapeutic targeting of this pathway mitigates ERS-mediated apoptosis, slowing DKD progression (92,93). Therefore, caspase-12 signaling is important for ERS-induced apoptosis. Despite genetic polymorphisms limiting its activity in humans, caspase-12 retains diagnostic and therapeutic value for ERS (94). Targeting the caspase-12 pathway may provide novel targets for the treatment of DKD.
JNK, originally identified in its capacity to phosphorylate the amino terminus of the transcription factor c-Jun (95), is also referred to as stress-activated protein kinase. Extracellular stimuli, such as stress signals, cytokines and growth factors, activate JNK, with the activation relying on the cellular microenvironment. JNK inhibition reduces podocyte apoptosis and matrix deposition, and combination with PERK/CHOP inhibitors may enhance therapeutic efficacy (96,97). As an important branch of the MAPK cascade, the JNK pathway orchestrates multiple physiological processes (98). During ERS, activated IRE1α engages TRAF2 to trigger apoptosis signal-regulating kinase 1 (ASK1) activation, generating a trimeric complex that sequentially activates JNK, CHOP and pro-apoptotic factors such as BH3-interacting domain death agonist and Bim, a process that suppresses anti-apoptotic genes, including Bcl-2 and Bcl-xL, and initiates mitochondrial apoptotic pathways (99–102). In addition, phosphorylation at the MEKK1 Ser280 residue activates the JNK signaling pathway, thereby promoting ERS-induced podocyte apoptosis (38,103). High glucose triggers JNK activation in renal cells, inducing apoptosis and fibrosis. These processes are alleviated by JNK inhibitors, which reduce CHOP/caspase-3-dependent apoptosis in ERS-impaired podocytes to mitigate DKD-related renal injury (33). Acting as a central stress response hub, the JNK pathway integrates external stimuli with intracellular signaling to govern inflammation and disease progression, with functional complexity emerging from stimulus subtype specificity, stimulus intensity and cellular context (104,105). Despite the challenges of drug development targeting JNK (such as poor specificity and high concentrations required to inhibit c-Jun phosphorylation), its potential applications in areas such as DKD and neurodegenerative diseases make it a promising therapeutic target (106–109).
The PERK/eIF2α signaling axis, a key branch of ERS signaling, maintains intracellular proteostasis by regulating protein synthesis and gene expression (110). Following the accumulation of misfolded or unfolded proteins in the ER, this pathway is activated to promote either stress adaptation or apoptosis through global translation inhibition and induction of stress-responsive genes (111). The key component of this pathway, PERK, is an ER transmembrane protein with a kinase domain on the cytoplasmic side, while only its stress-sensing domain is present within the lumen of the ER) (112). In unstressed cells, PERK stays inactive by associating with the ER chaperone BiP that has dissociated from GRP78 (113). By contrast, eIF2α is a key factor in the initiation of protein translation, and phosphorylation at its Ser51 site is a central event in the activation of the PERK/eIF2α pathway. This pathway coordinates cellular homeostasis through multifaceted mechanisms, such as translation repression for energy conservation, amino acid transporter induction for survival and proteostasis regulation through reduced synthesis, enhanced folding through mechanisms such as BiP upregulation, or misfolded protein degradation, for example, via ERAD (72).
The PERK/eIF2α branch of the UPR signaling pathway induces autophagy-associated gene expression through the transcriptional regulation of ATF4, thereby promoting the transcription of autophagy-associated genes (114). Downstream genetic effectors include beclin-1, which mediates autophagosome biogenesis and maturation, the ubiquitin-like system and transport receptor genes such as p62 and next to BRCA1 gene 1 protein (115). These transport receptor genes undergo selective degradation via ubiquitinated cargoes. Vaspin, a serine protease inhibitor, suppresses p62 aggregation by forming complexes with GRP78 and heat shock 70 kDa protein 1L (116,117). This mechanism protects organelles from metabolic stress-induced damage through endocytosis-driven autophagy facilitation, maintaining cellular homeostasis under stress (118). The PERK/eIF2α pathway is a ‘regulatory hub’ for ERS through precise regulation at the translational level and reprogramming of gene expression to maintain a balance between cell adaptation and death (119).
The IRE1 signaling cascade acts as a core ERS effector, governing adaptive or apoptotic cell fates predominantly by modulating mRNA splicing and gene transcription (120,121). The pathway is highly evolutionarily conserved from yeast to mammals and is a key mechanism for maintaining ER protein homeostasis. The IRE1/XBP1 axis preserves cellular homeostasis during acute stress by boosting protein folding, degradation and transport, while governing the activity of secretory cells, such as plasma and pancreatic β-cells, for efficient antibody and insulin production (122,123). Conversely, chronic ERS in pancreatic β-cells engages the IRE1/JNK pathway, causing β-cell death and diminishing insulin release (124,125).
The IRE1 pathway engages in crosstalk with the other two UPR arms: The PERK/eIF2α and ATF6 pathways. The PERK branch suppresses global translation through eIF2α phosphorylation to reduce protein synthesis load, while ATF6 activates BiP, ERAD and other chaperone genes through nuclear translocation (126,127). The IRE1 pathway promotes protein folding and degradation through XBP1 splicing, concurrently regulating cell fate through JNK activation and the regulated IRE1-dependent decay (RIDD) pathway (111,128). Collectively, these three pathways dictate cellular outcomes during stress, promoting survival under acute stress conditions and triggering apoptosis under prolonged or severe stress (129). In the ERS state, IRE1/XBP1 signaling directly promotes the expression of Bcl-2, increases the binding of Bcl-2 to beclin-1 and downregulates the activity of beclin-1, thus inhibiting autophagy (2). During early ERS, IRE1α assembles with TRAF2 and ASK1 to activate the downstream JNK signaling cascade, which phosphorylates Bcl-2 to promote its dissociation from beclin-1 and encourages subsequent autophagy initiation (92,93). In addition, XBP1, a downstream effector of IRE1α, promotes autophagy through beclin-1 activation (43). Blocking the kinase and RNase activities of IRE1α has been shown to intensify PA-induced cytotoxicity in renal tubular cells, indicating that IRE1α protects against PA-mediated kidney injury in DKD (130). The IRE1 signaling pathway is a ‘multifunctional hub’ of the ERS response, responsible for shutting down and splicing of the mRNA that encodes secretory proteins in a process called regulated RIDD to decrease ER protein load and spliced mRNA of XBP1 that activated the transcription of ER hemostatic factors as chaperone and endoplasmic reticulum-associated degradation components that degraded unfolded and misfolded proteins in an attempt to resolve endoplasmic reticulum stress; if this stress was unresolved, XBP1 upregulated the expression of JNK that activated podocytes, tubular apoptosis, and inflammation (131), and its aberrant activation is closely associated with a variety of diseases(such as Sepsis, DKD, breast cancer et.) (131–133).
Calcium channels are the core molecular machinery regulating the intracellular flow of Ca2+ across the membrane (129). DKD marked by glomerular mesangial matrix dilation, basement membrane thickening, tubulointerstitial fibrosis and renal unit loss involves Ca2+ as a key signaling molecule; calcium homeostatic imbalance markedly drives disease pathogenesis (134,135). The ER functions as a primary intracellular Ca2+ store, regulating calcium homeostasis (136). During stress, Ca2+ influx sustains cellular homeostasis by activating the MAPK pathway, thereby promoting intracellular protein folding (137,138). Excessive release of Ca2+ into the cytoplasm initiates ERS, thereby activating caspase-12-dependent autophagy (139). The transient ER surface calcium concentration is a key signal that determines the activation of ER autophagy (140). In addition, ATP and other Ca2+ mobilizers antagonize mTOR-mediated autophagy inhibition via Ca2+-dependent pathways, thereby promoting beclin-1- or autophagy-related gene 7-dependent autophagosome biogenesis (141,142). In addition, Ca2+ can activate both protein kinase C (PKC) and death-associated protein kinase (DAPK). PKC induces autophagy through an mTOR-independent pathway, whereas DAPK promotes beclin-1 phosphorylation and disrupts the beclin-1/Bcl-2 complex, thereby activating autophagy (143,144). The ERS-associated inhibition of PERK and IRE1 protects against kidney injury, mitochondrial dysfunction and renal cell apoptosis by maintaining Ca2+ homeostasis, which blocks cytosolic release of CytC and apoptosis-inducing factor, inhibits caspase-9 activation and restores mitochondrial membrane integrity, thereby suppressing pathological cell death pathways (145). Calcium channels are ‘signaling hubs’ for cellular functions, and their diversity and sophisticated regulatory mechanisms serve key roles in physiological and pathological processes (129,134).
As the major bioactive tetracyclic triterpenoid saponin of Astragalus membranaceus, AS exhibits extensive pharmacological activity, including immune enhancement. AS-II promotes the concanavalin A-induced proliferation of murine splenocytes, as well as mixed lymphocyte reactions and primary splenocyte proliferation induced by alloantigen or anti-CD3. AS-II increases the secretion of IL-2 and IFN-γ, upregulates IFN-γ and T-bet mRNA expression in splenocytes, and promotes CD25/CD69 expression in T-cell receptor-stimulated primary CD4+ T cells (146,147) In addition, it facilitates CD45-mediated lymphocyte-specific protein tyrosine kinase dephosphorylation of Tyr505 in primary T cells, enhancing their activation by modulating CD45 protein tyrosine phosphatase activity (147). AS-IV can further enhance both cellular and humoral immune responses (148). In vivo studies (146–148) using male mice to examine the effects of ASs on immune-response cytokines have revealed that AS-VII promotes the secretion of T helper (Th)1 cytokines, including IL-2 and IFN-γ, while inhibiting the production of Th2 cytokines such as IL-4. Immunohistochemical analyses of spleen and lymph node tissues from experimental mice revealed induced expression of CD25 and CD69 surface receptors, confirming Th1 cytokine activation (149).
Research on AS modulation of DKD through ERS intervention has primarily focused on DKD rodent models and meta-analyses (26,47,150–152). In DKD rat models (47,150) induced by a high-fat diet combined with streptozotocin (STZ), intragastric administration of AS-IV effectively mitigated apoptosis in renal tubular epithelial cells. This protective effect involved two primary mechanisms: i) Downregulation of ERS-associated proteins, including p-PERK, ATF4 and CHOP; and ii) restoration of the homeostatic balance between the pro-apoptotic protein Bax and anti-apoptotic protein Bcl-2 (47,150). In STZ-induced DKD rats (26,151,152), AS-IV alleviated ERS-driven podocyte apoptosis through three coordinated pathways: i) Suppression of the PERK/ATF4/CHOP signaling cascade; ii) inhibition of oxysterol-binding protein-related protein 150 (ORP150) and GRP78 expression; and iii) reduction of phosphorylation levels of PERK, eIF2α and JNK (26,151). Similarly, in db/db mice and podocytes exposed to high glucose or PA, two important pathological stimuli in DKD, AS-IV mitigated ERS and reduced podocyte apoptosis by restoring SERCA2 expression and activity (152). Collectively, AS-IV exerted anti-ERS effects through a multi-targeted strategy: Blocking three important ERS signaling pathways, including the PERK/ATF4/CHOP, PERK/eIF2α and IRE1/JNK pathways, increasing SERCA2 expression and decreasing ORP150 and GRP78 expression (Table I) (26,151,152).
Regarding clinical efficacy, numerous studies 153–158) have supported the therapeutic value of Radix Astragali (RA) in DKD: A meta-analysis encompassing 21 randomized controlled trials and four controlled trials involving 1,804 subjects demonstrated that intravenous RA injection has a superior efficacy compared with that of angiotensin-converting enzyme inhibitor/angiotensin II type 1 receptor blocker (ACEI/ARB) treatment alone, notably reducing blood urea nitrogen, serum creatinine (Scr), creatinine clearance and urinary protein levels, while elevating serum albumin (ALB) levels (153–155). Second, broad population studies: A previous meta-analysis including 66 randomized controlled trials and 4,785 patients without renal function stage restrictions indicated that combination of various RA preparations, including tablets, granules, decoctions, extracts and injections, with standard ACEI/ARB therapy reduced proteinuria and Scr levels (156). Third, long-term prognosis study: A 5-year retrospective cohort study involving 6,648 pre-dialysis patients with DKD revealed a reduction in all-cause mortality among RA users compared with other Chinese herbal medicine users (157). At present, there is no consensus on an optimal regimen regarding RA formulation and dosage. Among intravenous formulations, RA injections (20–50 ml; once daily) are most commonly administered. Oral preparations, including RA tablets (2.2 g; twice daily), granules (4–15 g; once or twice daily) and Astragalus injections (250 mg; once daily) are also frequently employed (158). Further research is warranted to evaluate the comparative efficacy of different administration routes.
Huangkui is a TCM approved by the Chinese National FDA for nephritis treatment. Its therapeutic effect on DKD is primarily mediated by active ingredients, particularly flavonoid derivatives such as quercetin glycosides and kaempferol glycosides. These components intervene in the core pathological mechanisms of DKD, including ERS, oxidative stress, the inflammatory response, apoptosis and renal interstitial fibrosis, thereby forming a multi-dimensional protective network (159–164). Huangkui (158,159) can restore ER protein homeostasis: The upregulation of molecular chaperone proteins GRP78 and GRP94 promotes correct protein folding, enhances ERAD of misfolded proteins, and attenuates ER loading (165).
For DKD, Wu et al (166) reported that Huangkui capsules could attenuate early glomerular pathological alterations by inhibiting the Akt/mTOR/70 kDa ribosomal protein S6 kinase signaling pathway. Regarding renal tubular protection, Han et al (167) confirmed that Huangkui capsules alleviated renal tubular EMT by inhibiting the activation of the NOD-, LRR- and pyrin domain-containing protein 3 inflammasome and the Toll-like receptor 4 (TLR4)/NF-κB signaling pathway. In addition, Zhu et al (168) indicated that Huangkui capsules attenuated DKD by inducing mitophagy through the stimulator of IFN genes 1/PTEN-induced kinase 1 signaling pathway in renal tubular cells. From a microecological perspective, Shi et al (169) demonstrated that Abelmoschus manihot improves levels of circulating DKD-related metabolites by modulating gut microbiota in non-obese diabetic mice. In terms of clinical research, Zhang et al (170) conducted a prospective, multicenter, randomized controlled trial that confirmed the efficacy and safety of Huangkui capsules in treating primary glomerular disease.
In summary, Huangkui capsules exert protective effects against both glomerular and tubular injuries by regulating multiple mechanisms, including signal transduction pathways, nuclear receptor activities, inflammatory responses, mitochondrial function and gut microbiota, thus providing novel drugs and approaches for the treatment of kidney disease. Ge et al (33) demonstrated that Huangkui ameliorated renal damage by attenuating ERS in DKD model rats. Through its multi-targeted mechanism, encompassing ERS inhibition, and antioxidant, anti-inflammatory, antifibrotic and podocyte-protective effects, Huangkui mediates multi-level regulatory effects in DKD progression, with notable promise in proteinuria control and delaying renal interstitial fibrosis (33,171,172). The natural medicinal properties of Huangkui provide a novel strategy for early intervention in DKD, and the combination of Chinese and Western medicine, which is particularly suitable for the long-term management of patients with mild to moderate proteinuria (170)
OA, as a monounsaturated fatty acid, serves an important role in the development of DKD, and its involvement in kidney injury through the regulation of ERS has attracted increasing attention. OA is naturally found in fruits and vegetables. Podocytes, early DKD targets, exhibit dose-dependent OA responses: Low-dose OA mitigates injury, while high-dose OA triggers ERS-PERK-mediated apoptosis, impairing podocyte protein synthesis and filtration barrier integrity. Mechanistically, CHOP upregulation inhibits Bcl-2, activating mitochondrial apoptotic cascades, such as the caspase-3-mediated cascade (173,174). OA also exerts context-dependent effects on tubular fibrosis: Low ERS inhibits fibrosis, while OA-induced ERS activates ATF6/CHOP to upregulate TGF-β1/α-smooth muscle actin (α-SMA), driving EMT (175). Excessive OA drives mesangial cell proliferation and ECM accumulation through ERS-hyperactivated mTOR signaling, contributing to glomerulosclerosis (176). This underscores OA concentration modulation as a promising DKD therapeutic strategy.
In preclinical models, OlA exhibits antioxidant, antiglycation, anti-inflammatory and bactericidal activity, notably ameliorating DKD by reducing ERS. In diabetic rats, OlA treatment enhances the renal protein expression of p-AMPK/AMPK and peroxisome proliferator-activated receptor γ coactivator 1-α (PGC-1α), while concurrently decreasing the expression of CD68, collagen-IV, TLR4, NF-κB and TGF-β1 (177). By regulating lipid metabolism and inflammation through the AMPK/PGC-1α and TLR4/NF-κB pathways, OlA mitigates renal injury in diabetic rats. In DKD model mice, OlA administration notably reduces the ALB-creatinine ratio (ACR). The marked DKD-induced elevation in ERS markers, such as p-PERK, p-eIF2α, ATF-6, BiP and CHOP, was notably decreased following OlA treatment, accompanied by marked reductions in ROS and nuclear factor erythroid 2-related factor 2 levels in glomerular mesangial cells (177,178). Furthermore, OlA administration reduces TGF-β/Smad2/3 signaling and α-SMA expression, repairs renal damage, alleviates albuminuria and suppresses diabetes-induced renal fibrosis by inhibiting ERS and apoptosis (179). In combination with N-acetylcysteine, OlA further attenuates oxidative stress and reduces the ERS-induced activation of TGF-β/Smad2/3 signaling (180).
Quercetin, a widely distributed natural polyphenol, exhibits potent antioxidant, anti-inflammatory and multi-target regulatory effects, making it a focal point of interdisciplinary research in disease prevention (181,182). Quercetin exhibits efficacy in treating metabolic diseases, including diabetes and its complications. Quercetin enhances cell-mediated immunity by upregulating IFN-γ secretion from Th1 lymphocytes and reduces inflammation by downregulating IL-4 secretion from Th2 lymphocytes (183). The protective effects of quercetin are mediated through multiple mechanisms, including inhibition of ROS production and mitochondrial permeability transition-pore opening, suppression of lipid peroxidation, elevation of glutathione and superoxide dismutase levels (184), inhibition of NF-κB, TNF-α and IL-6 signaling (185), reduction of inflammatory mediator release, suppression of angiotensin-converting enzyme and NF-κB activity, and enhancement of endothelial-dependent vasodilation (184,185). These actions collectively regulate blood pressure and reduce urinary protein excretion.
Quercetin may improve glucose homeostasis by modulating the expression of the microRNA-29 family, thereby increasing glucose transporters and insulin-like growth factor 1 gene expression, ultimately mitigating diabetic complications (186). In STZ-induced diabetic male Wistar rats, quercetin exhibited hypoglycemic effects, restored pancreatic morphology and β-cell function, reduced ERS markers such as CHOP and endothelin-1, inhibited lipid peroxidation, and enhanced antioxidant enzyme activities (183,187). Consequently, it lowered blood glucose levels, protected pancreatic tissues, alleviated ERS and improved oxidative status. Quercetin also inhibits platelet aggregation, hypertension and lipid peroxidation (188). In metabolic disorders, quercetin ameliorates diabetic endothelial dysfunction by targeting ERS, highlighting its role in metabolic-endothelial crosstalk (189).
ATG, a lignan extracted from Arctium lappa L. seeds and derived from burdock sapogenins, has a fat-soluble aromatic structure, which is important for its biological activities (190). In db/db mice, ATG reduced the urine ACR and 24-h urinary albumin excretion rate, improved blood glucose levels and body weight and inhibited caspase-12 expression (191). In HK2 cells exposed to high glucose, ATG suppressed the upregulation of ERS markers GRP78 and CHOP, and similarly downregulated GRP78 and CHOP expression in the renal cortex (56,192). These effects collectively improved clinical biomarkers, reduced apoptosis and alleviated ERS. The biological activities of ATG include antioxidant, anti-inflammatory, antifibrotic and ERS modulation properties, all of which contribute to its nephroprotective potential in various disease models, particularly in DKD, by targeting the ERS pathway (56).
As metabolic disease therapy, the renin-angiotensin system (RAS) inhibitors aliskiren (193,194) and valsartan (195,196) reduce DKD proteinuria by lowering glomerular pressure, with evidence showing that ERS pathway regulation contributes to their renoprotective effects in RAS-driven DKD.
ACEIs and ARBs such as aliskiren and valsartan inhibit renal ERS in DKD, and dual therapy yields cumulative renoprotective effects via synergistic RAS blockade and ERS control (193). Valsartan is recommended by several guidelines, including the Kidney Disease: Improving Global Outcomes (KDIGO) guidelines (197), as the preferred ARB for DKD with hypertension, and its nephroprotective effect is partly attributed to ERS modulation. The clinical use of aliskiren is currently limited due to early clinical trials, such as the ALTITUDE study (72,198), showing an increased risk of hyperkalemia and renal injury when used in combination with an ARB, but its single-agent modulation of ERS remains worth studying (199–201). Aliskiren and valsartan exert anti-apoptotic, anti-inflammatory and anti-fibrotic effects in DKD by inhibiting RAS overactivation and modulating upstream or downstream ERS. Valsartan, as a classical ARB, has been clinically validated as an ERS regulator, particularly in the context of DKD treatment. However, the ERS-targeting effect of aliskiren (a direct renin inhibitor) remains to be further evaluated and balanced in terms of its efficacy and safety (193). Basic research has confirmed that angiotensin II exacerbates ERS in renal tubular epithelial cells by activating the PERK/eIF2α/CHOP pathway, while ACEIs and ARBs downregulate stress markers such as GRP78 and CHOP in renal tissue (196,202). However, clinical studies have yet to incorporate assessments of ERS-related biomarkers, thus direct clinical evidence of ACEI and ARB exerting effects via inhibition of ERS is lacking (193,196). The 2024 KDIGO guidelines recommend RAS inhibitors for patients with DKD with proteinuria, emphasizing blood pressure and proteinuria management but omitting the discussion of ERS-related mechanisms (202).
CB1R, a notable cannabinoid receptor, is widely distributed in renal vascular endothelial, mesangial, tubular and immune cells (203,204). In DKD, hyperglycemia, oxidative stress and inflammation activate CB1R, inducing renal inflammation, fibrosis and metabolic dysfunction, including insulin resistance (205–207). CB1R antagonists, such as rimonabant and AM251, have been shown to improve glucose-lipid metabolism in metabolic disorders through the blockade of CB1R signaling, and their protective mechanism against DKD has been demonstrated to be closely associated with modulation of the ERS pathway (208,209). The protective effect of CB1R inhibition in DKD is linked to ERS pathway modulation, with CB1R, abundantly expressed in diabetic rats kidneys, mediating ERS and apoptosis in rat mesangial Cells) under high glucose. CB1R regulates palmitic acid-induced apoptosis in human renal proximal tubular cells through the ERS pathway (210,211). CB1R antagonists are not recommended in DKD guidelines; rimonabant has been withdrawn globally due to severe psychiatric side effects such as depression and anxiety (212). Subsequent candidate CB1R antagonists, such as AM6545, remain in preclinical research for DKD and have not yet been incorporated into guidelines (213,214).
Endogenous cannabinoids activating CB1R may serve a notable role in the pathogenesis of diabetic cardiomyopathy by promoting MAPK activation, type-1 angiotensin II receptor expression and signaling, AGE accumulation, oxidative and nitrosative stress, inflammation, and fibrosis (215,216). Conversely, CB1R antagonists exert anti-diabetic effects by increasing pancreatic β-cell glucokinase and glucose transporter (GLUT)-2 expression, improving β-cell insulin signaling and proliferation (for example, mitigating β-cell loss in male Zucker diabetic obese rats, independent of weight loss) (216,217). CB1R antagonists also upregulate skeletal muscle GLUT-4 to ameliorate intermittent hypoxia-induced insulin resistance, whereas CB1R agonists interfere with insulin signaling pathways (218,219). CB1R antagonists modulate the ERS pathway by blocking high-glucose- or inflammation-induced CB1R signaling on several levels: i) Inhibiting oxidative stress and calcium disruption (211); and ii) attenuating inflammation and fibrosis, thereby improving renal cell survival and renal function (220). The use of CB1R antagonists is subject to notable limitations. Currently, to the best of our knowledge, no human studies using CB1R antagonists have been conducted, and the risk of psychiatric side effects remains to be assessed (221,222). Consequently, clinical advancement cannot proceed at this stage (223). However, it holds potential and may provide a basis for DKD treatment following future animal studies and clinical trials.
Chemical chaperones, such as TUDCA and 4-PBA, are small molecules responsible for stabilizing protein conformation, enhancing ER folding and promoting mutant protein transport. TUDCA, a secondary bile acid, exhibits beneficial effects in various disorders, including diabetes, obesity and neurodegenerative disease (224). The cytoprotective mechanisms of chemical chaperones primarily involve the alleviation of ERS. 4-PBA, a small-molecule chaperone employed in urea-cycle disorders, mitigates ERS to normalize hyperglycemia and insulin resistance (225–227). Preclinical study has demonstrated the efficacy of 4-PBA in preventing podocyte apoptosis in type 2 diabetes (228). In addition, three widely used ERS inducers, clindamycin, dithiothreitol and carbobenzoxy-Leu-Leu-leucinal, have been applied to assess ERS in animal models and cell lines. 4-PBA was shown to alleviate drug-induced ERS (229), while drugs targeting PERK, IRE1α, eIF2α and ATF4, such as GSK2606414, MKC-3946, salubrinal and trazodone, offer promise for ERS-related disorder management (230,231). In rats fed a high-salt diet, damage to the glomeruli and proximal tubules was exacerbated, accompanied by increased urinary protein excretion. Following treatment with TUDCA, the levels of proximal tubular giant cells increased and urinary protein levels were markedly decreased (232). TUDCA and 4-PBA are not formally included in clinical guidelines for DKD. However, the Chinese Guidelines for the Prevention and Treatment of Diabetic Kidney Disease (2021 Edition) mention in the section on ‘Novel Therapeutic Targets for DKD’ that ‘chemical companions may improve renal injury by alleviating ERS’, listing TUDCA as a potential candidate drug (233).
In vitro and in vivo studies have shown that recombinant human rhodopsin kinase, epidermal growth factor receptor inhibitor (EGFRi) and dapagliflozin mitigate ERS and improve renal function (234,235). Shih et al (236) further found that dapagliflozin reduced myocardial ERS in patients with DKD. To the best of our knowledge, recombinant human retinal pigment kinase is not mentioned in any DKD-related clinical guidelines for the treatment of DKD or ERS suppression, as its primary research domain is hereditary retinal diseases, which bear no direct relationship with DKD. A previous study has suggested that recombinant human retinal pigment kinase may indirectly influence the ERS pathway by regulating protein folding (237), although this has not been validated in DKD renal cells or animal models. Nevertheless, based on the discussion of the impact of ERS on DKD, recombinant human retinal pigment kinase holds notable potential for DKD treatment. EGFRi was found to alleviate renal inflammation, oxidative stress and fibrosis in a mouse model of obesity-related kidney disease, with TLR4 primarily regulating EGFR pathway activation through phosphorylation of the c-Src/EGFR complex (238). No authoritative DKD clinical guidelines currently formally recommend EGFRi as a DKD therapeutic agent or ERS inhibitory target drug. However, excessive EGFR activation may exacerbate renal ERS injury through the PERK/ATF4/CHOP pathway. EGFRi may potentially alleviate DKD progression by inhibiting this pathway (239–243); however, further animal studies and clinical evidence are required to substantiate this.
Sodium-glucose co-transporter 2 (SGLT2) inhibitors, such as empagliflozin and dapagliflozin, currently represent first-line therapies for DKD. Their regulation of ERS involves indirect multi-pathway interventions, and the direct association between their renal protective effects and ERS inhibition requires validation through mechanistic clinical trials (244,245). The 2024 KDIGO guidelines classify SGLT2 inhibitors as a first-line therapy with Class 1A recommendation for patients with DKD with an estimated glomerular filtration rate (eGFR) ≥20 ml/min/1.73 m2, emphasizing their role in delaying renal progression (246,247). However, ERS-related mechanisms are not addressed. Existing large-scale clinical trials have primarily focused on definitive renal endpoints, such as eGFR decline and end-stage kidney disease, without systematic assessment of ERS biomarkers (202,248–251). Thus, attention to ERS treatment is warranted for kidney disease.
The aforementioned drugs exhibit pleiotropic effects, indicating their lack of specificity for ERS inhibition; thus, development of ERS-targeted therapeutics is warranted. Notably, ERS exhibits dual effects: Moderate ERS restores intracellular homeostasis, while sustained ERS drives renal damage in DKD, meaning that human-targeted ERS research is warranted (252–254). A deeper understanding of the mechanisms underlying this process will help improve the treatment of DKD.
As a major microvascular complication of diabetes mellitus, DKD is closely associated with aberrant activation of ERS. Factors such as hyperglycemia and oxidative stress trigger an imbalance of protein folding in renal podocytes, tubular epithelial and renal capsule cells, which activates the three core pathways of the UPR, namely the IRE1α/XBP1, PERK/eIF2α/ATF4 and ATF6 pathways (50,255). Short-term ERS maintains cellular homeostasis by promoting protein folding and degradation, whereas sustained overactivation induces pro-apoptotic factor expression, such as CHOP expression, exacerbating inflammatory responses through NF-κB pathway activation and mesangial fibrosis via TGF-β1/Smad3 pathway dysregulation, which ultimately leads to glomerulosclerosis and renal failure. Several stimuli disrupting cellular homeostatic function induce ERS (58,256) (Fig. 1). The present review discusses ERS-related experimental agents, preclinical models and clinical data, alongside an analysis of the three UPR pathways in DKD renal histopathology.
Phase I and II clinical trials are underway for ERS-modulating compounds such as alginate and TUDCA (257). Pharmacological interventions against ERS have focused on blocking the excessive stress response. However, although the aforementioned RAS inhibitors, SGLT2 inhibitors, 4-PBA and CB1R antagonists may regulate ERS through indirect pathways, existing guidelines do not provide specific recommendations based on this mechanism (258–260). Clinical trials lack ERS-related endpoint data, and the causal relationship between medications for the treatment of DKD, ERS) requires further validation through targeted research. Western drugs, such as PERK inhibitors, IRE1α endonuclease inhibitors and CHOP antagonists, have demonstrated potential in attenuating apoptosis and fibrosis in animal models (203,261–263); however, challenges associated with target specificity and long-term safety remain.
ERS inhibitors commonly used in laboratory studies, such as the chemical chaperone 4-PBA or the pathway-specific PERK inhibitor GSK2606414, generally exhibit good tolerability in rodent DKD models (264,265), but their clinical safety assessments present significant challenges. Primarily, ERS is a fundamental physiological mechanism enabling cellular responses to abnormal protein folding, which is important in metabolically active tissues such as pancreatic β-cells and hepatocytes. While 4-PBA alleviates ERS in renal tissues of rat models (266–268), its prolonged clinical application may cause hyperammonemia and gastrointestinal mucosal irritation. Furthermore, suppressing ERS responses in pancreatic β-cells can impair insulin synthesis, potentially exacerbating glycemic dysregulation (225). Secondly, the risk of kidney-specific toxicity may be underestimated. Animal models commonly involve young, healthy rats, whereas clinical patients with DKD typically present with comorbidities such as hypertension, cardiovascular disease and renal insufficiency, markedly reducing drug metabolism capacity. In addition, drug interactions remain unclear: Patients with DKD frequently require concomitant hypoglycemic, antihypertensive and lipid-lowering medications (269,270). Furthermore, ERS inhibitors may compete with SGLT2 inhibitors for renal tubular excretion pathways or affect the renal metabolism of ACEIs, increasing the risk of adverse reactions such as hyperkalemia (271). Such interactions are challenging to detect in controlled, single-factor laboratory settings. Additionally, the complex multi-pathway regulatory nature of ERS, coordinated by PERK, IRE1α and ATF6, combined with individual heterogeneity among patients with DKD makes ‘precision targeting’ a translational challenge. Laboratory studies often target single pathways, whereas clinical ERS activation patterns vary notably among patients with DKD: Some cases of DKD primarily involve activation of the PERK/eIF2α pathway, accompanied by extensive tubular epithelial apoptosis, while others predominantly involve activation of the ATF6 pathway, accompanied by inflammatory mediator release (for example, elevated IL-6 and TNF-α levels) (71). Furthermore, ERS in DKD involves glomerular mesangial cells, podocytes and tubular epithelial cells; however, existing drugs exhibit systemic distribution, complicating precise delivery to specific renal cell subpopulations (18,19).
Addressing these bottlenecks requires further research. Safety evaluations should incorporate multiple animal models with renal insufficiency to more accurately replicate drug metabolism characteristics observed in clinical populations. For target optimization, kidney-specific drug formulations could be developed to enhance renal tissue accumulation. Only through these approaches can ERS inhibition strategies transition from being mechanistically effective in laboratory settings to being safe and beneficial in clinical practice.
The active constituents of TCM, such as AS and Huangkui total flavonoids, exert multi-target modulatory effects on ERS, including the downregulation of CHOP and inhibition of IRE1α phosphorylation (47,166). These compounds also exert antioxidant, anti-inflammatory and podocyte-protective effects, supporting clinical evidence of reduced proteinuria and delayed renal function decline in DKD. Such findings underscore the potential of TCM-Western medicine integration as a promising research avenue for DKD management. The development and translation of ER-specific reagents targeting protein folding, UPR signaling and ER calcium homeostasis hold promise for novel therapeutic strategies (7).
In future research, it is important to investigate ERS biomarkers for early DKD diagnosis by elucidating the underlying ERS mechanisms. BiP/GRP78, as a sentinel protein for ERS activation, exhibits increased expression levels that signal early ERS and are directly associated with the severity of renal pathological damage in DKD, thereby providing a foundational reference for assessing disease progression (112). Concurrently, p-PERK, p-eIF2α and ATF4 from the PERK pathway, p-IRE1α and XBP1s from the IRE1α pathway and ATF6f (a type II transmembrane protein that under ER stress is translocated to the Golgi apparatus where it is proteolytically processed, releasing the cytoplasmic fragment of ATF6) (77). from the ATF6 pathway indicate the activation status of the three principal UPR branches, accurately reflecting the ERS-mediated pathological transition from adaptive protection to apoptosis initiation. The comprehensive assessment of these markers not only clarifies the molecular mechanisms of ERS in DKD but also provides molecular evidence for staging disease progression (16). These biomarkers thus hold potential for translation into early diagnostic tools and therapeutic efficacy-monitoring indicators for DKD, enabling precise clinical interventions. Simultaneously, the development of inhibitors targeting specific pathways, such as IRE1α-specific inhibitors, is important, offering novel therapeutic strategies for DKD management. Given the growing potential of ERS-targeted therapies, focused clinical studies are required to deepen the current understanding of DKD pathogenesis and refine targeted interventions. Collectively, these efforts will advance DKD treatment and provide insights that are relevant to broader ERS-associated disorders.
Not applicable.
The present study was supported by the Jilin Province Science and Technology Development Program (grant no. 20210101201JC).
Not applicable.
PZ contributed to writing the manuscript and prepared the figures. YZ made substantial contributions to the conception and design of the study, conducting a comprehensive and systematic literature review to identify key studies and ensuring the research was grounded in relevant and current findings in the field of DKD. YZ also played a crucial role in the analysis and interpretation of data, particularly in understanding the mechanisms of ERS in DKD. Additionally, YZ contributed to drafting significant portions of the manuscript and critically revised it for important intellectual content. YZ approved the final version of the manuscript and takes full responsibility for the integrity and accuracy of the work, ensuring all aspects of the research were thoroughly addressed. CC, YC, FL, SZ and CL revised the manuscript. All authors read and approved the final version of the manuscript. Data authentication is not applicable.
Not applicable.
Not applicable.
The authors declare that they have no competing interests.
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