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Circulation Research. 2002
Published online before print August 15, 2002, doi: 10.1161/01.RES.0000033520.95242.A2
A more recent version of this article appeared on September 6, 2002
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Submitted on February 8, 2002
Revised on July 9, 2002
Accepted on July 31, 2002

G{alpha}q and Gß{gamma} Regulate PAR-1 Signaling of Thrombin-Induced NF-{kappa}B Activation and ICAM-1 Transcription in Endothelial Cells

Arshad Rahman *; Andrea L. True ; Khandaker N. Anwar ; Richard D. Ye ; Tatyana A. Voyno-Yasenetskaya ; and Asrar B. Malik

From the Department of Pharmacology, College of Medicine, The University of Illinois, Chicago, Ill.

* To whom correspondence should be addressed. E-mail: ARahman{at}uic.edu.

As thrombin binding to the G protein{ndash}coupled proteinase activated receptor-1 (PAR-1) induces endothelial adhesivity to leukocytes through NF-{kappa}B activation and intercellular adhesion molecule-1 (ICAM-1) expression, we determined the signaling pathways mediating the response. Studies showed that the heterotrimeric G proteins, G{alpha}q, and the Gß{gamma} dimer were key determinants of the PAR-1 agonist peptide (TFLLRNPNDK)-induced NF-{kappa}B activation and ICAM-1 expression in endothelial cells. Cotransfection of RGS3T, a regulator of G-protein signaling that inhibits G{alpha}q, or {alpha}-transducin (G{alpha}t), a scavenger of the Gß{gamma}, markedly decreased NF-{kappa}B activity induced by PAR-1 activation. We determined the downstream signaling targets activated by G{alpha}q and Gß{gamma} that mediate NF-{kappa}B activation. Expression of the kinase-defective protein kinase C (PKC)-{delta} mutant inhibited NF-{kappa}B activation induced by the constitutively active G{alpha}q mutant, but had no effect on NF-{kappa}B activity induced by Gß1{gamma}2. In related experiments, NF-{kappa}B as well as ICAM-1 promoter activation induced by Gß1{gamma}2 were inhibited by the expression of the dominant-negative mutant of 85-kDa regulatory subunit of PI 3-kinase; however, the expression of this mutant had no effect on the response induced by activated G{alpha}q. Cotransfection of the catalytically inactive Akt mutant inhibited the NF-{kappa}B activation induced by the constitutively active PI 3-kinase mutant as well as that by the activated forms of G{alpha}q and PKC-{delta}. These results support a model in which ligation of PAR-1 induces NF-{kappa}B activation and ICAM-1 transcription by the engagement of parallel G{alpha}q/PKC-{delta} and Gß{gamma}/PI3-kinase pathways that converge at Akt.


Key words: G proteins • protein kinase C-{delta} • Akt • nuclear factor-{kappa}B • intercellular adhesion molecule-1 • endothelial cells




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