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Platelet activation plays an important role in arterial thrombotic disorders. Here we show that the serum-borne phospholipid lysophosphatidic acid (LPA) activates the GTPase Rho and its target Rho-kinase to induce myosin light-chain (MLC) and moesin phosphorylation, leading to platelet shape change. MLC phosphorylation, moesin phosphorylation, and shape change were blocked by preincubating platelets...
Oxidised low density lipoprotein (LDL) plays an important role in the pathogenesis of atherosclerosis. Here we demonstrate that mildly oxidised (mox) LDL engages the GTPase Rho and its effector molecule p160 Rho-kinase to induce phosphorylation of myosin light chain and of moesin leading to platelet shape change. Pretreatment of platelets with the selective Rho inhibitor C3-transferase from Clostridium...
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