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J. Biol. Chem., Vol. 277, Issue 33, 29584-29592, August 16, 2002
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B, cAMP RESPONSE
ELEMENT-BINDING PROTEIN, CCAAT/ENHANCER-BINDING PROTEIN-
, AND
ACTIVATING TRANSCRIPTION FACTOR-2*
§,
, and
From the Previous studies have shown that
mitogen-activated protein kinase (MAPK) cascades signal the induction
of inducible nitric-oxide synthase (iNOS) in glial cells (Bhat,
N. R., Zhang, P., Lee, J. C., and Hogan E. L. (1998)
J. Neurosci. 18, 1633-1641; Bhat, N. R., Zhang,
P., and Bhat, A. N. (1999) J. Neurochem. 72, 472-478). This study further investigates the role of p38 MAPK in the
transcriptional activation of the iNOS gene by transient transfection
with constitutively active upstream kinases in the pathway
(i.e. MAPK kinase 3 (MKK3b(E)) and MAPK kinase 6 (MKK6b(E)). Expression in C-6 glial cells of either MKK3b(E) or
MKK6b(E) resulted in an induction of the activity of a cotransfected
rat iNOS promoter-reporter (iNOS-luciferase (Luc)) gene and an
enhancement of cytokine-induced expression of iNOS mRNA, both of
which were inhibitable by the p38 MAPK inhibitor SB203580. The MKK
constructs also induced cAMP response element-mediated (CRE-Luc) and
nuclear factor
Department of Neurology, Medical University
of South Carolina, Charleston, South Carolina 29425 and the
¶ Department of Anesthesiology, University of Illinois,
Chicago, Illinois 60612
B-dependent (nuclear factor
B-Luc) transcriptional activities. Transfection with dominant negative (dn)
forms of CRE-binding protein (CREB) and CCAAT/enhancer-binding protein
(C/EBP), the two CRE-binding transcription factors targeted by the p38
MAPK pathway, resulted in opposite effects; dnCREB enhanced and dnC/EBP
inhibited iNOS-Luc parallel to their effects on CRE-Luc. In addition,
the induction, by MKK3b(E) and MKK6b(E), of iNOS promoter activity was
enhanced by a wild-type activating transcription factor (ATF-2),
whereas a phosphorylation-defective form of ATF-2 had a suppressive
effect. The results of these molecular studies provide evidence for an
important role for the p38 MAPK pathway in the transcriptional
activation of the iNOS gene in rat glial cells involving the
transcription factors nuclear factor
B, C/EBP, and ATF-2.
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