| 1 | Caveolin-1-deficient fibroblasts promote migration,invasion,and stemness via activating the TGF-β/Smad signaling pathway in breast cancer cells显示文摘Cancer-associated fibroblasts(CAFs)represent one of the main components in the tumor stroma and play a key role in breast cancer progression.Transforming growth factor-β(TGF-β)has been established to mediate breast cancer metastasis by regulating the epithelial-mesenchymal transition(EMT)and stemness of cancer cells.Caveolin-1(CAV-1)is a scaffold protein of caveolae that is related to the proliferation and metabolism of cancer cells.It is now well demonstrated that CAV-1 deficiency in the tumor stroma is positively correlated with distant metastasis,but the mechanism remains unclear.Here,we explore whether CAV-1-deficient fibroblasts play an essential role in the EMT and stemness of breast cancer cells(BCCs)through TGF-βsignaling.We establish a specific small interfering RNA(siRNA)to inhibit CAV-1 expression in fibroblasts and coculture them with BCCs to investigate the effect of CAV-1-deficient fibroblasts and the tumor microenvironment on breast cancer progression.This study refreshingly points out that CAV-1 deficiency in fibroblasts enhances TGF-β1 secretion and then activates the TGF-β1/Smad signaling pathway of BCCs,thus promoting the metastasis and stemness of BCCs.Collectively,our findings indicate an unexpected role of CAV-1 deficiency in fibroblasts and the tumor microenvironment as a permissive factor,which is regulated by the TGF-β1 signaling pathway in BCCs. | Qingyun Huang Longyuan Wu Yi Wang Xinyu Kong Xinhua Xiao Qiyuan Huang Miao Li Yujia Zhai Fuxiu Shi Ruichen Zhao Junpei Zhong Lixia Xiong | 2022 | Acta Biochimica et Biophysica Sinica2022，54，11： | 1 |
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