ArticleBreast cancer (Dove Medical Press)2025
CLEC3A Promotes Immune Evasion and Tumor Progression by Enhancing PD-L1 Stability to Weaken T Cell Cytotoxicity in Luminal Breast Cancer.
Article in Breast cancer (Dove Medical Press), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Luminal breast cancer (BC) is the most common subtype of BC. C-type lectin domain family 3 member A (CLEC3A) has been shown to promote malignant characteristics in BC cells, but the specific mechanisms are not well understood. This study aimed to explore the oncogenic role of CLEC3A in luminal BC and its potential mechanisms. Methods: Transcriptomic data from GEO and TCGA databases were analyzed to identify differentially expressed genes in luminal BC. Kaplan-Meier curves were used to assess the prognostic value of CLEC3A in luminal BC, and CLEC3A expression was further validated in BC cell lines. Functional assays, including colony formation, wound healing, Transwell, and flow cytometry, were performed following CLEC3A knockdown or overexpression. The impact of CLEC3A on PD-L1 stability was analyzed by co-immunoprecipitation (co-IP) and Western blotting. The influence of CLEC3A on T cell activity was investigated by co-culturing CD8 Results: CLEC3A expression was significantly upregulated in luminal BC patients and correlated with poor overall survival. In vitro, CLEC3A knockdown suppressed proliferation, migration, invasion and promoted apoptosis, whereas CLEC3A overexpression enhanced these malignant features. CLEC3A also regulated mRNA expression levels of key proliferation-related genes and immune factors, and it regulated the stability of PD-L1 protein in BC cells through ubiquitination. Additionally, CLEC3A knockdown increased tumor cell death and CD8⁺ T cell activity, while overexpression suppressed these responses. Conclusion: CLEC3A promotes BC progression and immune evasion by regulating PD-L1 stability and inhibiting CD8⁺ T cell function. Targeting CLEC3A may enhance anti-tumor immunity and improve patient outcomes in luminal BC.
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