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Transmembrane protein 88 (TMEM88) belongs to a member of the TMEM family, and was reported to be involved in fibrogenesis. However, the biological role of TMEM88 in renal fibrosis has not been elucidated. Therefore, the objective of this study was to investigate the effect of TMEM88 on cell proliferation and extracellular matrix (ECM) accumulation in a TGF-β1-induced human renal proximal tubular epithelial cell line (HK2). Our results showed that TMEM88 was downregulated in renal fibrotic tissues and TGF-β1-treated HK2 cells. In addition, TMEM88 overexpression inhibited TGF-β1-induced cell proliferation and migration in HK2 cells. Furthermore, TMEM88 overexpression reduced the production of α-SMA, collagen I, and collagen III in TGF-β1-stimulated HK2 cells. Mechanistically, TMEM88 overexpression suppressed the phosphorylation status of Smad2 and Smad3 in TGF-β1-stimulated HK2 cells. In conclusion, data from our experiments demonstrate that TMEM88 plays a pivotal role in the pathological process of renal fibrosis. TMEM88 inhibited fibrosis in renal proximal tubular epithelial cells by suppressing the TGF-β1/Smad signaling pathway.

rsc advances

Retracted Article: TMEM88 inhibits fibrosis in renal proximal tubular epithelial cells by suppressing the transforming growth factor-β1/Smad signaling pathway