期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 366, 期 4, 页码 905-909出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2007.12.033
关键词
clusterin; TGF-beta; Smad2; Smad3
Clusterin (CLU) is known as a multifunctional protein involved in a variety of physiological processes including lipid transport, epithelial cell differentiation, tumorigenesis, and apoptosis. It is known that CLU interacts with TGF-beta type 11 receptor (T beta R11). However, the relationship of CLU and TGF-beta signaling is unclear. Here we present that CLU is a novel modulator of TGF-beta signaling by regulating Smad2/3 proteins. Overexpression of CLU enhanced TGF-beta-induced transcriptional activity and increased the amount of Smad2/3 proteins, while CLU siRNA repressed TGF-beta-induced transcriptional activity and decreased the amount of Smad2/3 proteins in Hep3B cells. We also found that CLU was involved in Smad2/3 stability at the protein level. These findings suggest that CLU regulates TGF-beta signaling pathway by modulating the stability of Smad2/3 proteins. (c) 2007 Elsevier Inc. All rights reserved.
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