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The effect of mitogens on phospholipase D activity was investigated in NIH-3T3 fibroblasts by measuring the accumulation of phosphatidylpropanol, produced by phospholipase D phosphatidyl transferase activity when 1-propanol acts as the phosphatidyl group acceptor. Platelet-derived growth factor (PDGF) and 12-O-tetradecanoylphorbol 13-acetate (TPA) stimulated phosphatidylpropanol production by the cells. The dose-response relationships for activation of phospholipase D and stimulation of thymidine incorporation by PDGF and TPA were comparable. The possibility that activation of phospholipase D is utilized by mitogens as a trans-membrane pathway for signalling cell growth is discussed.
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Ben-Av et al. (1989) studied this question.
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