ArticleJournal of cancer research and clinical oncology2025
CAA-derived IL-6 promoted the PD-L1 expression of breast cancer via STAT3/miR-497a-5p signaling.
Article in Journal of cancer research and clinical oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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6 authors.
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Abstract
backgroundAdipocytes are engaged in the development and progression of breast cancer (BC). Cancer-associated adipocytes (CAAs) are specific adipocytes located at the invasive front of BC that modulate tumor behaviors. This study aimed to investigate the effect of CAA-derived IL-6 in regulating BC progression.
methodsHuman BC specimens and adipocytes co-cultured with BC cells were used to explore the characteristics of CAAs. Adipocytes and 4T1 cells co-implanted in mouse model and tail vein metastasis model were used to explore the effect of CAAs on malignant progression and immunosuppressive tumor microenvironment (TME) of BC in vivo. The functional assays, flow cytometry, ELISA, miRNAs sequencing and dual-luciferase reporter assay were implemented to investigate the role of CAA-derived IL-6 in regulating programmed cell death protein ligand 1 (PD-L1) expression.
resultsCAAs were present at the invasive front of BC with a de-differentiated fibroblast phenotype. CAAs enhanced the malignant behaviors of 4T1 BC cells in vitro, and promoted 4T1 tumor growth and lung metastasis with decreased CD8
conclusionsOur study demonstrated that CAAs promoted the malignant behaviors of BC and enhanced immunosuppression in TME. Specifically, CAA-derived IL-6 promoted the PD-L1 expression of BC via STAT3/miR-497a-5p signaling, thereby contributing to BC progression.
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