Summary
SV3T3 cells, originally responsive to epidermal growth factor (EGF) and displaying density-dependent inhibition of growth, lose responsiveness to the growth factor after several passages and then proliferate without restriction, but continue to display EGF receptor sites at the cell surface. Proliferation of primary fetal rat hepatocytes is not stimulated by EGF, but cells bind it to an extent comparable to that of responsive 3T3 cells. Therefore presence of EGF receptors does not imply that cells are responsive to the growth factor. The relevance of some growth-factor-induced events for DNA synthesis initiation is dicussed. In various primary and secondary cell cultures, Ca++-levels appear to be involved in controlling cell proliferation. In contrast, in 3T3-4a cells, levels of Ca++ ions are not tightly coupled to DNA synthesis initiation; effects of growth factors are not mediated by extracellular Ca++ ions, but cells have a Ca++-sensitive restriction, point in G1. In various cell types in primary or secondary culture or in 3T3-4a cells, polyamine, levels are not tightly coupled to induction of proliferation. Therefore growth-factor-induced ornithine decarboxylase is not an event essential for DNA synthesis initiation. Normal but not transformed cells have a spermidine/spermine-sensitive restriction point in G1. Although rRNA synthesis appears to be necessary for induction of proliferation, preliminary data obtained by double-beam flow microfluorometry suggest that cellular RNA levels might not affect rate of entry into S phase and, furthermore, that 3T3-4a cells can enter S without accumulating RNA above levels present in quiescent cells. It appears that none of the events induced during the prereplicative phase that have been studied in 3T3 cells are essential for DNA synthesis initiation under normal culture conditions.
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This work was supported by Research Grants GM 20101, CA 15087, CA 14195, CA 12227 and CA 11176 from the USPHS, and Grant BC-30D from the American Cancer Society.
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Paul, D., Brown, K.D., Thomas Rupniak, H. et al. Cell cycle regulation by growth factors and nutrients in normal and transformed cells. In Vitro 14, 76–84 (1978). https://doi.org/10.1007/BF02618176
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DOI: https://doi.org/10.1007/BF02618176