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Ionic changes associated with lead stimulation of DNA synthesis in Balb/c3T3 cells

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Abstract

Lead at slightly subtoxic concentrations markedly stimulated the rate of DNA synthesis in cultured animal cells. This stimulation was closely correlated with formation of a precipitate that was adsorbed and taken up by the cells under certain medium conditions. Data suggest that a precipitate-induced perturbation of the surface membrane leads to intracellular changes responsible for stimulation of DNA synthesis. Maximum stimulation of3H-thymidine incorporation by optimum concentrations of lead is delayed about 8 h compared to that in serum stimulation. In cells stimulated significantly by lead, but not in unstimu-lated cells, a reproducible rise of about 13% in intracellular magnesium occurred over a 24 h period, with an 8 h lag in the increase compared to that observed in serum stimulation. In view of the increases in intracellular magnesium consistently associated with and preceding stimulation of DNA synthesis by several different mitogens including serum and insulin, the present time-coordinated positive correlation between magnesium and DNA synthesis provides evidence for the primary involvement of this divalent cation in growth stimulation produced by lead.

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Authors and Affiliations

  1. Department of Molecular Biology and Virus Laboratory, University of California, 94720, Berkeley, California

    Hisashi Sanui & Harry Rubin

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  1. Hisashi Sanui
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  2. Harry Rubin
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Sanui, H., Rubin, H. Ionic changes associated with lead stimulation of DNA synthesis in Balb/c3T3 cells. Biol Trace Elem Res 6, 289–307 (1984). https://doi.org/10.1007/BF02989237

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  • DOI: https://doi.org/10.1007/BF02989237

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