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- W2081845005 abstract "Abstract TGF‐β plays an important role in regulating cell differentiation and proliferation in human cancers such as colorectal cancer. Id‐1 has been identified as a marker in colorectal cancer progression. The aim of this study was to investigate the role of TGF‐β in regulating Id‐1 in LoVo cells. siRNA was used to silence smad2, smad3, and p38 MAPK gene expression in Lovo cells. Interference efficiency and the role of TGF‐β on Id‐1 expression were analyzed using a luciferase reporter assay, RT‐PCR, and Western blotting. Cell viability was determined using the MTT assay. In this study, we demonstrated that TGF‐β1 downregulated Id‐1 protein expression in LoVo cells. Smad2 and smad3 siRNA inhibited TGF‐β1‐induced 4×SBE luciferase reporter activity. p38 MAPK siRNA inhibited TGF‐β1‐induced 3×AP‐1 luciferase reporter activity. However, the suppression of Id‐1 by TGF‐β1 was recovered by smad3 siRNA but not smad2 or p38 MAPK siRNA. Moreover, TGF‐β1 stimulated cellular proliferation and p21 Waf1 protein expression, which might be mediated by suppressing Id‐1 expression. In conclusion, this study demonstrated that TGF‐β1 suppressed Id‐1 expression in a smad3‐dependent manner in LoVo cells using RNAi technology. These results provide new insight into the mechanisms of TGF‐β function in colorectal cancer cells. Anat Rec, 2010. © 2009 Wiley‐Liss, Inc." @default.
- W2081845005 created "2016-06-24" @default.
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- W2081845005 date "2009-12-28" @default.
- W2081845005 modified "2023-10-18" @default.
- W2081845005 title "Transforming Growth Factor-β Suppressed Id-1 Expression in a smad3-Dependent Manner in LoVo Cells" @default.
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- W2081845005 doi "https://doi.org/10.1002/ar.21012" @default.
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