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J Appl Physiol 84: 2089-2098, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 6, 2089-2098, June 1998

Nicotine stimulates DNA synthesis and proliferation in vascular endothelial cells in vitro

Amparo C. Villablanca

Division of Cardiovascular Medicine, University of California, Davis, California 95616

Nicotine is a major component of cigarette smoke and has been postulated to play an important role in atherogenesis and malignancy. Endothelial cell growth may be regulated by nicotine, yet operative mechanisms at the endothelial level are poorly understood. We studied the effects of nicotine (10-14-10-4 M) on endothelial DNA synthesis, DNA repair, proliferation, and cytotoxicity by using cultures of bovine pulmonary artery endothelial cells. Assays were performed on cells incubated with nicotine in the presence and absence of hydroxyurea (an inhibitor of scheduled DNA synthesis), serum, human platelet-poor plasma, and platelet-derived growth factor and endothelial cell growth factor (PDGF and PDECGF, respectively). Nicotine significantly stimulated endothelial cell DNA synthesis and proliferation at concentrations lower than those obtained in blood after smoking (<10-8 M). The stimulatory effects of nicotine were enhanced by serum (0.5%) and PDECGF and were blocked by the nicotinic-receptor antagonist hexamethonium. The response to nicotine was bimodal because cytotoxicity was observed at higher concentrations (>10-6 M). This study has implications for understanding cellular mechanisms of nicotine action. The results may be important in tumor angiogenesis, atherogenesis, and vascular dysfunction in smokers.

tumor; angiogenesis; serum; plasma; hydroxyurea; platelet-derived growth factors; smoking; hexamethonium


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