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Effect of vascular endothelial growth factor on nitric oxide production by cultured rat mesangial cells


Effect of vascular endothelial growth factor on nitric oxide production by cultured rat mesangial cells



Biochemical and Biophysical Research Communications 245(2): 443-446



ISSN/ISBN: 0006-291X

PMID: 9571172

DOI: 10.1006/bbrc.1998.8454

Vascular endothelial growth factor (VEGF) stimulates nitric oxide (NO) production by endothelial cells in vitro and in vivo. However, the impact of VEGF on inducible nitric oxide synthase (iNOS) activity and NO synthesis in cultured mesangial cells is not known. Therefore, we measured nitrite accumulation in cytokine-stimulated, rat mesangial cells (RMC) in response to graded concentrations of VEGF. Addition of VEGF (10-50 ng/ml) did not alter RMC viability or NO production in either normal (5.6 mM) or high (33.3 mM) glucose conditions. Exposure of RMC to VEGF did not modify the effects of L-arginine (20 mM) or L-NAME (1 mM) on nitrite accumulation in normal or high glucose media. The steady state abundance of iNOS mRNA and the cytosolic content of iNOS protein were unaffected by addition of VEGF. Cultured RMC expressed the high-affinity tyrosine kinase VEGF receptors, flt and flk/KDR, and the levels were not modulated by incubation in normal or high glucose media. We conclude that VEGF does not regulate proliferation or NO production in cultured RMC. These findings suggest that disturbances in the normal interaction between VEGF and NO are not involved in the pathogenesis of abnormal mesangial cell structure or function in diabetic nephropathy.

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