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Sci. Signal., 19 March 2013
Vol. 6, Issue 267, p. ra18
Breaking the Endothelial Barrier
Thrombin is an endogenous ligand that induces vasoconstriction and can also disrupt the barrier formed by blood vessel endothelial cells, which leads to increased vascular permeability and leakage of plasma into the tissue. Using the thrombin-induced decrease in transendothelial resistance in two types of cultured endothelial cells as a model of barrier disruption, Shinde et al. found that the calcium-responsive protein STIM1 coupled the thrombin receptor to activation of the guanosine triphosphatase RhoA and rearrangement of the actin cytoskeleton, which contribute to loss of cell-cell contact. Surprisingly, this role did not involve various cation channels that are targets of STIM1. How STIM1 couples the thrombin receptor to RhoA remains an open question.
Citation: A. V. Shinde, R. K. Motiani, X. Zhang, I. F. Abdullaev, A. P. Adam, J. C. González-Cobos, W. Zhang, K. Matrougui, P. A. Vincent, M. Trebak, STIM1 Controls Endothelial Barrier Function Independently of Orai1 and Ca2+ Entry. Sci. Signal.6, ra18 (2013).