Abstract

HVJ(Sendai virus)-induced fusion of Ehrlich ascites tumor cells was found to be stimulated by treatments which increase the intracellular level of cyclic AMP. This stimulation was optimal at an external concentration of Ca ++ of about 0.5 mM. During the process of cell fusion, the intracellular concentration of cyclic AMP was increased with a maximum at 2 min after the initiation of the fusion reaction. Evidence is also presented which suggests that the increase of the cyclic nucleotide is a part of control mechanism of HVJ-induced fusion of eukariotic cells. Thus, this cyclic AMP-stimulated process could be one of the step(s) requiring ATP and Ca ++, both of which are necessary for the overall fusion process of the tumor cells.

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