NDLI: Hypoxia induces expression of connective tissue growth factor in scleroderma skin fibroblasts

Content Provider	PubMed Central
Author	Hong, K-h Yoo, S-a Kang, S-s Choi, J-j Kim, W-u Cho, C-s
Copyright Year	2006
Abstract	Connective tissue growth factor (CTGF) plays a role in the fibrotic process of systemic sclerosis (SSc). Because hypoxia is associated with fibrosis in several profibrogenic conditions, we investigated whether CTGF expression in SSc fibroblasts is regulated by hypoxia. Dermal fibroblasts from patients with SSc and healthy controls were cultured in the presence of hypoxia or cobalt chloride (CoCl2), a chemical inducer of hypoxia-inducible factor (HIF)-1α. Expression of CTGF was evaluated by Northern and Western blot analyses. Dermal fibroblasts exposed to hypoxia (1% O2) or CoCl2 (1–100 µM) enhanced expression of CTGF mRNA. Skin fibroblasts transfected with HIF-1α showed the increased levels of CTGF protein and mRNA, as well as nuclear staining of HIF-1α, which was enhanced further by treatment of CoCl2. Simultaneous treatment of CoCl2 and transforming growth factor (TGF)-β additively increased CTGF mRNA in dermal fibroblasts. Interferon-γ inhibited the TGF-β-induced CTGF mRNA expression dose-dependently in dermal fibroblasts, but they failed to hamper the CoCl2-induced CTGF mRNA expression. In addition, CoCl2 treatment increased nuclear factor (NF)-κB binding activity for CTGF mRNA, while decreasing IκBα expression in dermal fibroblasts. Our data suggest that hypoxia, caused possibly by microvascular alterations, up-regulates CTGF expression through the activation of HIF-1α in dermal fibroblasts of SSc patients, and thereby contributes to the progression of skin fibrosis.
Related Links	http://dx.doi.org/10.1111/j.1365-2249.2006.03199.x
Starting Page	362
File Format	PDF
ISSN	13652249
e-ISSN	13652249
Journal	Clinical and Experimental Immunology
Issue Number	2
Volume Number	146
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2006-11-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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