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Role of von Hippel-Lindau protein in fibroblast proliferation and fibrosis.
FASEB J. 25, 3032-3044 (2011)
Idiopathic pulmonary fibrosis (IPF) is characterized by exaggerated fibroblast proliferation and accumulation of collagens and fibronectin. The extracellular fibronectin and collagen network is regulated by von Hippel-Lindau protein (pVHL). However, it is unknown whether pVHL contributes to pulmonary fibrosis. We found that lungs from patients with IPF expressed increased levels of pVHL in fibroblastic foci. Bleomycin treatment also induced pVHL in lung fibroblasts, but not in alveolar type II cells. Overexpression of pVHL increased lung fibroblast proliferation, protein abundance of fibronectin and collagen, and extracellular fibronectin. In addition, overexpression of pVHL induced expression of the α5 integrin subunit. Overexpression of pVHL did not alter hypoxia-inducible factor luciferase reporter activity and mRNA expression of vascular endothelial growth factor. Fibroblasts overexpressing pVHL were more sensitive to RGD peptide-mediated reduction in proliferation. Activating α5 and β1 integrin increased proliferation of fibroblasts overexpressing pVHL and those cells were more resistant to the inhibition of α5 integrin. Overexpression of pVHL also increased activation of focal adhesion kinase (FAK). Moreover, suppression of pVHL prevented TGF-β1-induced proliferation of mouse embryonic fibroblasts. Taken together, our results indicate that elevated expression of pVHL results in the aberrant fibronectin expression, activation of integrin/FAK signaling, fibroblast proliferation, and fibrosis.-Zhou, Q., Pardo, A., Königshoff, M., Eickelberg, O., Budinger, G. R. S., Thavarajah, K., Gottardi, C. J., Jones, J., Varga, J., Selman, M., Sznajder, J. I., Raj, J. U., Zhou, G. Role of von Hippel-Lindau protein in fibroblast proliferation and fibrosis.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
idiopathic pulmonary fibrosis; extracellular matrix; integrin a5b1-ocal adhesion kinase
Language
Publication Year
2011
HGF-reported in Year
2011
ISSN (print) / ISBN
0892-6638
e-ISSN
1530-6860
Journal
FASEB Journal
Quellenangaben
Volume: 25,
Issue: 9,
Pages: 3032-3044
Publisher
Wiley
Publishing Place
Bethesda, Md.
Reviewing status
Peer reviewed
Institute(s)
Institute of Lung Health and Immunity (LHI)
POF-Topic(s)
30202 - Environmental Health
30503 - Chronic Diseases of the Lung and Allergies
30503 - Chronic Diseases of the Lung and Allergies
Research field(s)
Lung Research
PSP Element(s)
G-501600-001
G-551800-001
G-551800-001
PubMed ID
21642472
WOS ID
WOS:000294435200018
Erfassungsdatum
2011-06-30