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Endogenous production of nitric oxide by vascular endothelial growth factor down-regulates proliferation of choriocarcinoma cells.

Abstract：

:The trophoblast-like choriocarcinoma cell line BeWo expresses a receptor for vascular endothelial growth factor (VEGF) and proliferates in response to VEGF. Nitric oxide (NO) seems to play a key role in the VEGF-induced proliferation of endothelial cells but the NO mechanistic regulation of VEGF-stimulated trophoblast proliferation is presently unclear. We assessed the effect of exogenous VEGF on BeWo cell proliferation by [3H]thymidine incorporation. The VEGF-induced proliferation of BeWo cells was significantly increased by the NO synthase (NOS) inhibitor, N(omega)-nitro-l-arginine methyl ester (L-NAME), but was inhibited by the NO donor, sodium nitroprusside. Treatment of the cells with 10 ng/ml of VEGF increased not only eNOS expression but also NO production. The extracellular signal-regulated kinase (Erk) of the mitogen-activated protein kinase (MAPK) family was activated by VEGF as demonstrated by the phosphorylation of Erk in Western blots. The effects of VEGF on NO production and the expression of endothelial NOS (eNOS) were attenuated by treating BeWo cells with the selective inhibitor of MAPK kinase, PD98059. VEGF-stimulated proliferation of BeWo cells was inhibited by the tyrosine kinase inhibitor genistein but increased by PD98059. Other kinase inhibitors, including LY294002 (phosphoinositide 3-kinase inhibitor) and SB203580 (P38 MAPK inhibitor), had no effect on the proliferation of the cells and NO production. These results indicate that endogenous NO production down-regulates the VEGF-stimulated proliferation of BeWo cells and that the activation of Erk plays an important role in this mechanism.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Cha MS,Lee MJ,Je GH,Kwak JY

doi

10.1006/bbrc.2001.4682

subject

Has Abstract

pub_date

2001-04-13 00:00:00

pages

1061-6

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(01)94682-0

journal_volume

282

pub_type

杂志文章

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