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1(I) collagen by
TGF-
1 in mesangial cells: role of the p38 MAPK
pathway
1 Toxicological Sciences, Environmental Health Sciences, and 3 Department of Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21205; and Sections of 4 Pulmonary and Critical Care Medicine and 2 Nephrology, Department of Internal Medicine, Yale University School of Medicine and the Veterans Affairs Connecticut Healthcare Systems, New Haven, Connecticut 06520
Transforming growth factor-
1
(TGF-
1) is a potent inducer of extracellular matrix
protein synthesis and a key mediator of renal fibrosis. However, the
intracellular signaling mechanisms by which TGF-
1
stimulates this process remain incompletely understood. In this report,
we examined the role of a major stress-activated intracellular
signaling cascade, belonging to the mitogen-activated protein kinase
(MAPK) superfamily, in mediating TGF-
1 responses in rat
glomerular mesangial cells, using dominant-negative inhibition of
TGF-
1 signaling receptors. We first stably transfected
rat glomerular mesangial cells with a kinase-deleted mutant TGF-
type II receptor (T
R-IIM) designed to inhibit
TGF-
1 signaling in a dominant-negative fashion. Next,
expression of T
R-IIM mRNA was confirmed by Northern
analysis. Cell surface expression and ligand binding of
T
R-IIM protein were demonstrated by affinity cross-linking with 125I-labeled-TGF-
1.
TGF-
1 rapidly induced p38 MAPK phosphorylation in
wild-type and empty vector (pcDNA3)-transfected control mesangial cells. Interestingly, transfection with dominant-negative
T
R-IIM failed to block TGF-
1-induced p38
MAPK phosphorylation. Moreover, dominant-negative T
R-IIM
failed to block TGF-
1-stimulated pro-
1(I) collagen mRNA expression and cellular protein synthesis, whereas TGF-
1-induced extracellular signal-regulated kinase
(ERK) 1/ERK2 activation and antiproliferative responses were blocked by
T
R-IIM. In the presence of a specific inhibitor of p38
MAPK, SB-203580, TGF-
1 was unable to stimulate
pro-
1(I) collagen mRNA expression in the control and
T
R-IIM-transfected mesangial cells. Finally, we
confirmed that both p38 MAPK activation and pro-
1(I)
collagen stimulation were TGF-
1 effects that were
abrogated by dominant-negative inhibition of TGF-
type I receptor.
Thus we show first demonstration of p38 MAPK activation by
TGF-
1 in mesangial cells, and, given the rapid kinetics,
this TGF-
1 effect is likely a direct one. Furthermore,
our findings suggest that the p38 MAPK pathway functions as a component
in the signaling of pro-
1(I) collagen induction by
TGF-
1 in mesangial cells.
transforming growth factor-
receptor; signal transduction; mitogen-activated protein kinase; matrix
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