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Am J Physiol Lung Cell Mol Physiol 286: L539-L545, 2004. First published November 21, 2003; doi:10.1152/ajplung.00130.2003
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Vascular endothelial growth factor-induced secretion of fibronectin is ERK dependent

Altaf S. Kazi, Shidan Lotfi, Elena A. Goncharova, Omar Tliba, Yassine Amrani, Vera P. Krymskaya, and Aili L. Lazaar

Pulmonary, Allergy, and Critical Care Division, Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104

Submitted 30 April 2003 ; accepted in final form 10 November 2003

In severe asthma, cytokines and growth factors contribute to the proliferation of smooth muscle cells and blood vessels, and to the increased extracellular matrix deposition that constitutes the process of airway remodeling. Vascular endothelial growth factor (VEGF), which regulates vascular permeability and angiogenesis, also modulates the function of nonendothelial cell types. In this study, we demonstrate that VEGF induces fibronectin secretion by human airway smooth muscle (ASM) cells. In addition, stimulation of ASM with VEGF activates ERK, but not p38MAPK, and fibronectin secretion is ERK dependent. Both ERK activation and fibronectin secretion appear to be mediated through the VEGF receptor flt-1, as evidenced by the effects of the flt-1-specific ligand placenta growth factor. Finally, we demonstrate that ASM cells constitutively secrete VEGF, which is increased in response to PDGF, transforming growth factor-{beta}, IL-1{beta}, and PGE2. We conclude that ASM-derived VEGF, through modulation of the extracellular matrix, may play an important role in airway remodeling seen in asthma.

extracellular matrix; signal transduction; asthma; extracellular signal-related kinase; airway smooth muscle


Address for reprint requests and other correspondence: A. L. Lazaar, Pulmonary, Allergy, and Critical Care Division, Univ. of Pennsylvania School of Medicine, 852 BRB II/III, 421 Curie Blvd., Philadelphia, PA 19104 (E-mail: alazaar{at}mail.med.upenn.edu).




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