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Molecular and Cellular Biology, August 2001, p. 5554-5565, Vol. 21, No. 16
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.16.5554-5565.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Protein Kinase C-
Regulates Thrombin-Induced
ICAM-1 Gene Expression in Endothelial Cells via Activation of p38
Mitogen-Activated Protein Kinase
Arshad
Rahman,1,*
Khandaker N.
Anwar,1
Shahab
Uddin,2,3
Ning
Xu,1
Richard D.
Ye,1
Leonidas C.
Platanias,2,3 and
Asrar B.
Malik1
Department of
Pharmacology1 and Section of
Hematology-Oncology,2 The University of Illinois
College of Medicine, Chicago, Illinois 60612, and West Side
Veteran Affairs Hospital, Chicago, Illinois 606073
Received 30 October 2000/Returned for modification 16 January
2001/Accepted 25 May 2001
The procoagulant thrombin promotes the adhesion of
polymorphonuclear leukocytes to endothelial cells by a mechanism
involving expression of intercellular adhesion molecule 1 (ICAM-1) via
an NF-
B-dependent pathway. We now provide evidence that
protein kinase C-
(PKC-
) and the p38 mitogen-activated protein
(MAP) kinase pathway play a critical role in the mechanism of
thrombin-induced ICAM-1 gene expression in endothelial cells. We
observed the phosphorylation of PKC-
and p38 MAP kinase within 1 min
after thrombin challenge of human umbilical vein endothelial
cells. Pretreatment of these cells with the PKC-
inhibitor rottlerin
prevented the thrombin-induced phosphorylation of p38 MAP kinase,
suggesting that p38 MAP kinase signals downstream of PKC-
.
Inhibition of PKC-
or p38 MAP kinase by pharmacological and genetic
approaches markedly decreased the thrombin-induced NF-
B
activity and resultant ICAM-1 expression. The effects of
PKC-
inhibition were secondary to inhibition of IKK
activation and of subsequent NF-
B binding to the ICAM-1 promoter.
The effects of p38 MAP kinase inhibition occurred downstream of
I
B
degradation without affecting the DNA binding
function of nuclear NF-
B. Thus, PKC-
signals thrombin-induced
ICAM-1 gene transcription by a dual mechanism involving activation
of IKK
, which mediates NF-
B binding to the ICAM-1 promoter, and p38 MAP kinase, which enhances transactivation potential of the bound
NF-
B p65 (RelA).
*
Corresponding author. Mailing address: Department of
Pharmacology (M/C 868), University of Illinois College of Medicine, 835 South Wolcott Ave., Chicago, IL 60612-7343. Phone: (312) 355-0242. Fax:
(312) 413-0222. E-mail: ARahman{at}uic.edu.
Molecular and Cellular Biology, August 2001, p. 5554-5565, Vol. 21, No. 16
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.16.5554-5565.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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