Vanadium ions stimulate DNA synthesis in Swiss mouse 3T3 and 3T6 cells.
AUTOR(ES)
Smith, J B
RESUMO
Vanadyl sulfate and sodium orthovanadate in the concentration range between 5 and 50 microM are shown to be mitogenic for quiescent cultures of Swiss mouse 3T3 and 3T6 cells. The compounds caused a striking shift in the dose-response for the effect of serum on [3H]thymidine incorporation and DNA synthesis. In the absence of serum the effect of vanadium was greatly potentiated by insulin. Vanadium ions produced no more than additive increases in [3H]thymidine incorporation when combined with epidermal growth factor, cholera toxin, or phorbol 12-myristate 13-acetate. Both vanadium compounds stimulated ouabain-inhibitable 86Rb+ uptake, indicating that the vanadium ions increase, rather than inhibit, Na+/K+ pump activity in the intact cell. Neither vanadium compound had any effect on cellular cAMP under a variety of different conditions. The mitogenic effect of the vanadium compounds was similar to that of colchicine. Taxol, which stabilizes cytoplasmic microtubules, prevented the stimulation of DNA synthesis by vanadium.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=394255Documentos Relacionados
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