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J Biol Chem, Vol. 275, Issue 17, 12475-12480, April 28, 2000
From the Expression of the kinin B1 receptor is
up-regulated in chronic inflammatory and fibrotic disorders; however,
little is known about its role in fibrogenesis. We examined human
embryonic lung fibroblasts that constitutively express the B1 receptor
and report that engagement of the B1 receptor by
des-Arg10-kallidin stabilized connective tissue
growth factor (CTGF) mRNA, stimulated an increase in
Des-Arg10-kallidin Engagement of the B1 Receptor
Stimulates Type I Collagen Synthesis via Stabilization of
Connective Tissue Growth Factor mRNA*
§,
,
**, and
Pulmonary Center, Departments of Medicine
and Biochemistry, Boston University School of Medicine and the
Boston Veterans Affairs Medical Center and the
¶ Endocrine-Hypertension Division, Department of Medicine, Harvard
Medical School, Boston, Massachusetts 02118-2394
1(I)
collagen mRNA, and stimulated type I collagen production. These
events were not observed in B2 receptor-activated fibroblasts. In
addition, B1 receptor activation by des-Arg10-kallidin
induced a rise in cytosolic Ca2+ that is consistent with B1
receptor pharmacology. Our results show that the
des-Arg10-kallidin-stimulated increase in
1(I) collagen
mRNA was time- and dose-dependent, with a peak response
observed at 20 h with 100 nM
des-Arg10-kallidin. The increase in CTGF mRNA was also
time- and dose-dependent, with a peak response observed at
4 h with 100 nM des-Arg10-kallidin. The
increase in CTGF mRNA was blocked by the B1 receptor antagonist
des-Arg10,Leu9-kallidin. Inhibition of protein
synthesis by cycloheximide did not block the
des-Arg10-kallidin-induced increase in CTGF mRNA. These
results suggest that engagement of the kinin B1 receptor contributes to
fibrogenesis through increased expression of CTGF.
*
This work was supported in part by NHLBI Grant P50HL56386
from the National Institutes of Health and by the Veterans Affairs Medical Center Merit Review Research Program.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
Supported by NIDDK Grant R03DK53538 from the National
Institutes of Health.
**
Boston Veterans Affairs Medical Center Research Enhancement Awards
Program Fellow.
§
To whom correspondence should be addressed: Pulmonary Center,
Boston University School of Medicine, 715 Albany St., R3, Boston, MA
02118-2394. Tel.: 617-638-4860; Fax: 617-536-8093l; E-mail: ricupero@ bu.edu.
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