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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
Caveolin-1 regulates transforming growth factor (TGF)-beta/SMAD signaling through an interaction with the TGF-beta type I receptor.
Journal of Biological Chemistry 2001 March 3
Transforming growth factor-beta (TGF-beta) signaling proceeds from the cell membrane to the nucleus through the cooperation of the type I and II serine/threonine kinase receptors and their downstream SMAD effectors. Although various regulatory proteins affecting TGF-beta-mediated events have been described, relatively little is known about receptor interactions at the level of the plasma membrane. Caveolae are cholesterol-rich membrane microdomains that, along with their marker protein caveolin-1 (Cav-1), have been implicated in the compartmentalization and regulation of certain signaling events. Here, we demonstrate that specific components of the TGF-beta cascade are associated with caveolin-1 in caveolae and that Cav-1 interacts with the Type I TGF-beta receptor. Additionally, Cav-1 is able to suppress TGF-beta-mediated phosphorylation of Smad-2 and subsequent downstream events. We localize the Type I TGF-beta receptor interaction to the scaffolding domain of Cav-1 and show that it occurs in a physiologically relevant time frame, acting to rapidly dampen signaling initiated by the TGF-beta receptor complex.
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