Cell proliferation and cell death appear in several systems as mutually exclusive, which raises the assumption that a same factor or secondary signal(s) might exert opposite control on the two processes. To test this assumption we investigated the time-course evolution of the S phase and apoptotic indices in rat liver during cyproterone acetate (CPA) induced hyperplasia and during the recovery of normal liver mass provoked, respectively, by cyproterone acetate (CPA) treatment and withdrawal. The levels of c-myc and c-ras transcripts were also followed in view of the indications of a positive role of these oncogenes in proliferation. The data showed that proliferation and cell death are not always mutually exclusive and that a high rate of cell death was indifferently associated with high or low c-ras expression. Our data are consistent with a role of this gene in proliferation but exclude that it plays an opposite role in controlling cell death.
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