Abstract
Rat 3Y1 cell lines that express either adenovirus type 12 E1A 13S mRNA or 12S mRNA in response to dexamethasone treatment were established by introduction of recombinant vector DNA containing the E1A 13S- or 12S-mRNA cDNA placed downstream of the hormone-inducible promoter of mouse mammary tumor virus. These cell lines were growth arrested, and the induction of cell cycle progression was analyzed by flow cytometry after switch on of the cDNA by the addition of dexamethasone. The results indicate that the 13S- or 12S-mRNA product alone has the ability to cause progression of the cell cycle at a similar rate. The simultaneous addition of epidermal growth factor accelerated the rate of cell cycle progression in the transition from the G0/G1 phase to the S phase.
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