Effects of inorganic arsenicals on DNA synthesis in unsensitized human blood lymphocytes in vitro.
Effects of inorganic arsenicals on DNA synthesis in unsensitized human blood lymphocytes were biphasic: The chemicals at very low concentrations enhanced DNA synthesis, whereas higher concentrations inhibited DNA synthesis. The concentrations of arsenicals at which the maximum stimulating effect was found were 1 x 10(-5) M, 1 x 10(-6) or 2 x 10(-6) M, and 0.8 x 10(-6) or 1 x 10(-6) M for sodium arsenite exposure of 1 h, 3 d, and 6 d, respectively; for sodium arsenate, 1 x 10(-5) M, 1 x 10(-5) M, and 2 x 10(-6) or 5 x 10(-6) M, respectively. Arsenicals must be present for the entire 6-d culture period to produce maximum stimulation of DNA synthesis in human lymphocytes. The longer exposure of the lymphocytes to arsenicals, the lower the concentrations of arsenicals at which the maximum stimulating effect on DNA synthesis was found. Stimulating effect of trivalent arsenic (sodium arsenite) on DNA synthesis was stronger than pentavalent arsenic (sodium arsenate), and the stronger the effect of trivalent arsenic than pentavalent, the longer exposure of the cells to the chemicals. Both sodium arsenite and sodium arsenate stimulated DNA synthesis in human lymphocytes to a lower degree than phytohemagglutinin (PHA).
Meng
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Department of Environmental Science, Shanxi University, Taiyuan, P.R. China.
Meng
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D001149:Arsenates / Q000097:blood / Q000633:toxicity*; D020261:Arsenic Poisoning; D001152:Arsenicals / Q000097:blood; D018053:Arsenites / Q000097:blood / Q000633:toxicity*; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects; D008214:Lymphocytes / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D010835:Phytohemagglutinins / Q000633:toxicity; D017670:Sodium Compounds / Q000097:blood / Q000633:toxicity*; D013439:Sulfhydryl Reagents / Q000633:toxicity
D001149:Arsenates; D001152:Arsenicals; D018053:Arsenites; D010835:Phytohemagglutinins; D017670:Sodium Compounds; D013439:Sulfhydryl Reagents; C017947:sodium arsenite; C009277:sodium arsenate; D004247:DNA