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Am J Physiol Lung Cell Mol Physiol 279: L360-L370, 2000;
1040-0605/00 $5.00
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Vol. 279, Issue 2, L360-L370, August 2000

Role of Ras-dependent ERK activation in phorbol ester-induced endothelial cell barrier dysfunction

Alexander D. Verin1, Feng Liu1, Natalia Bogatcheva1, Talaibek Borbiev1, Marc B. Hershenson2, Peiyi Wang1, and Joe G. N. Garcia1

1 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21224; and 2 Department of Pediatrics, University of Chicago School of Medicine, Chicago, Illinois 60637

The treatment of endothelial cell monolayers with phorbol 12-myristate 13-acetate (PMA), a direct protein kinase C (PKC) activator, leads to disruption of endothelial cell monolayer integrity and intercellular gap formation. Selective inhibition of PKC (with bisindolylmaleimide) and extracellular signal-regulated kinases (ERKs; with PD-98059, olomoucine, or ERK antisense oligonucleotides) significantly attenuated PMA-induced reductions in transmonolayer electrical resistance consistent with PKC- and ERK-mediated endothelial cell barrier regulation. An inhibitor of the dual-specificity ERK kinase (MEK), PD-98059, completely abolished PMA-induced ERK activation. PMA also produced significant time-dependent increases in the activity of Raf-1, a Ser/Thr kinase known to activate MEK (~6-fold increase over basal level). Similarly, PMA increased the activity of Ras, which binds and activates Raf-1 (~80% increase over basal level). The Ras inhibitor farnesyltransferase inhibitor III (100 µM for 3 h) completely abolished PMA-induced Raf-1 activation. Taken together, these data suggest that the sequential activation of Ras, Raf-1, and MEK are involved in PKC-dependent endothelial cell barrier regulation.

mitogen-activated protein kinases; extracellular signal-regulated kinase; cytoskeleton


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