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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Rho-ROCK-LIMK-cofilin pathway regulates shear stress activation of sterol regulatory element binding proteins.
Circulation Research 2003 June 28
Previous studies have shown that integrin activation and fluid shear stress can modulate the activity of sterol regulatory element binding proteins (SREBPs) in vascular endothelial cells. We investigated the role of small GTPase Rho-mediated signal transduction pathway in this mode of SREBP activation. Fluid shear stress activates the Rho downstream effectors ROCK, LIM kinase (LIMK), and cofilin. The various negative mutants of RhoA, ROCK, LIMK, and cofilin can block the shear stress activation of SREBPs. The shear stress-activated SREBP depends on S2P proteases but not caspase-3. Mechanistically, the endoplasmic reticulum-to-Golgi transport of SREBP cleavage-activating protein requires the actin-based cytoskeleton and is enhanced by the Rho-ROCK-LIMK-cofilin pathway. By enhancing the SREBP-mediated cholesterol metabolism, this unique mechanism may contribute to endothelial cell functions under flow.
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