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Review Open Access

CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review)

  • Authors:
    • Xiuping Lai
    • Yan Yan
    • Lu Sun
    • Zili Lei
    • Yanhong Yang
  • View Affiliations / Copyright

    Affiliations: The First Affiliated Hospital (The First School of Clinical Medicine), Guangdong Pharmaceutical University, Guangzhou, Guangdong 510080, P.R. China, Guangdong Metabolic Diseases Research Center of Integrated Chinese and Western Medicine, Guangdong Pharmaceutical University, Guangzhou, Guangdong 510006, P.R. China
    Copyright: © Lai et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 110
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    Published online on: March 3, 2026
       https://doi.org/10.3892/ijmm.2026.5781
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Abstract

Claudin‑7 (CLDN7) is a key component of epithelial tight junctions. It plays a vital role in maintaining cell polarity, barrier integrity and paracellular transport. Abnormal CLDN7 expression is closely related to the onset and progression of various diseases. It is especially markedly associated with the growth and metastasis of multiple cancers. Additionally, dysregulated CLDN7 expression contributes to the progression of intestinal, skin and respiratory system diseases. The present review summarized the structure, expression, physiological functions, stability and regulatory mechanisms of CLDN7, emphasizing its role in tumors. The expression patterns, regulatory mechanisms, effect on malignant phenotypes and clinical significance of CLDN7 were also discussed.
View Figures

Figure 1

Schematic diagram of CLDN7 structure.
CLDN7 is a complete membrane protein with four hydrophobic TM, two
extracellular loops (ECL1, ECL2), an amino terminus and a carboxyl
terminus. CLDN7, claudin-7; TM, transmembrane domains.

Figure 2

Schematic diagram of CLDN7 expression
and regulatory mechanism. CLDN7, claudin-7; PTM, post-translational
modification; ELF3, E74-like factor 3; IRF2, interferon regulatory
factor 2; HNF4α, hepatocyte nuclear factor 4α; p65, nuclear
factor-kappa B subunit p65; p50, nuclear factor-kappa B1; p53,
tumor protein p53; SNAIL1P, SNAIL family transcriptional repressor;
IκB, inhibitor of nuclear factor-kappa B; ANGⅡ, angiotensin II;
AT1, angiotensin II type 1 receptor; TGF-β, transforming growth
factor-beta; TβR Ⅰ and Ⅱ, transforming growth factor-beta receptor
type I and type II; SMAD2/3, SMAD family member 2 and SMAD family
member 3; c-MYC, MYC proto-oncogene; AR-V7, androgen receptor
variant 7; ACSS2, acyl-CoA synthase short-chain family member 2;
crotonyl-CoA, crotonyl coenzyme A; FTO, fat mass and
obesity-associated protein; CBP/P300, CREB-binding
protein/E1A-binding protein p300; m6A, N6-methyladenosine; H4K12cr,
histone H4 lysine 12 crotonylation; miR-155, microRNA 155;
miR-1193, microRNA 1193.

Figure 3

Regulatory mechanisms of CLDN7 in
cancer. CLDN7, claudin-7; EMT, epithelial-mesenchymal transition;
AKT, AKT serine/threonine kinase; p21, cyclin-dependent kinase
inhibitor 1A; Cyclin D1, G1/Specific Cyclin-D1; Wnt/β-catenin,
wingless/integrated/β-catenin; c-Myc, MYC proto-oncogene; TGF-β,
transforming growth factor-beta; SqCLC, squamous-cell lung cancer;
RCC, renal cell carcinoma; CRC, colorectal cancer; NSCLC,
non-small-cell lung cancer.

Figure 4

Correlation between CLDN7 levels and
OS or DFS in different tumor tissues. Data were retrieved from the
Gene Expression Profiling Interactive Analysis (GEPIA) public
database (http://gepia.cancer-pku.cn). CLDN7,
claudin-7; OS, overall survival; DFS, disease-free survival; TPM,
transcripts per million; HR, hazard ratio; LGG, low-grade glioma;
GBM, glioblastoma multiforme; KIRP, clear cell renal cell
carcinoma; UVM, uveal melanoma; ACC, adrenal cortical
carcinoma.

Figure 5

The role of CLDN7 in non-cancer
diseases. CLDN7, claudin-7; IBD, inflammatory bowel disease; CTE,
congenital tufting enteropathy.
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Copy and paste a formatted citation
Spandidos Publications style
Lai X, Yan Y, Sun L, Lei Z and Yang Y: CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review). Int J Mol Med 57: 110, 2026.
APA
Lai, X., Yan, Y., Sun, L., Lei, Z., & Yang, Y. (2026). CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review). International Journal of Molecular Medicine, 57, 110. https://doi.org/10.3892/ijmm.2026.5781
MLA
Lai, X., Yan, Y., Sun, L., Lei, Z., Yang, Y."CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review)". International Journal of Molecular Medicine 57.5 (2026): 110.
Chicago
Lai, X., Yan, Y., Sun, L., Lei, Z., Yang, Y."CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review)". International Journal of Molecular Medicine 57, no. 5 (2026): 110. https://doi.org/10.3892/ijmm.2026.5781
Copy and paste a formatted citation
x
Spandidos Publications style
Lai X, Yan Y, Sun L, Lei Z and Yang Y: CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review). Int J Mol Med 57: 110, 2026.
APA
Lai, X., Yan, Y., Sun, L., Lei, Z., & Yang, Y. (2026). CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review). International Journal of Molecular Medicine, 57, 110. https://doi.org/10.3892/ijmm.2026.5781
MLA
Lai, X., Yan, Y., Sun, L., Lei, Z., Yang, Y."CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review)". International Journal of Molecular Medicine 57.5 (2026): 110.
Chicago
Lai, X., Yan, Y., Sun, L., Lei, Z., Yang, Y."CLDN7: Epithelial gatekeeper from physiology to pathology‑roles in cancer and epithelial‑related diseases (Review)". International Journal of Molecular Medicine 57, no. 5 (2026): 110. https://doi.org/10.3892/ijmm.2026.5781
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