Opposite effects of dibutyryl adenosine 3′:5′ cyclic monophosphate and serum on growth of Chinese hamster cells

The effect of dibutyryl adenosine cyclic 3′:5′ monophosphate and testosterone on growth, response to serum and transport properties of Chinese hamster ovary cells was studied. There was a marked depression of growth in the presence of both compounds. A change of medium was sufficient to permit a partially synchronized burst of growth of the treated cells either in the presence or absence of dibutyryl adenosine cyclic 3′:5′ monophosphate plus testosterone. However, in the presence of these compounds a second round of cell division was prevented. Initiation of the cell cycle by cells exposed to dibutyryl adenosine cyclic 3′:5′ monophosphate plus testosterone displayed a greater serum requirement than untreated cells. It is concluded that serum and cyclic AMP could have antagonistic interactions in growth regulation.

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