Requirement for cAMP-PKA pathway activation by M phase-promoting factor in the transition from mitosis to interphase

Science
D GriecoM E Gottesman

Abstract

Cell cycle progression in cycling Xenopus egg extracts is accompanied by fluctuations in the concentration of adenosine 3',5'-monophosphate (cAMP) and in the activity of the cAMP-dependent protein kinase (PKA). The concentration of cAMP and the activity of PKA decrease at the onset of mitosis and increase at the transition between mitosis and interphase. Blocking the activation of PKA at metaphase prevented the transition into interphase; the activity of M phase-promoting factor (MPF; the cyclin B-p34cdc2 complex) remained high, and mitotic cyclins were not degraded. The arrest in mitosis was reversed by the reactivation of PKA. The inhibition of protein synthesis prevented the accumulation of cyclin and the oscillations of MPF, PKA, and cAMP. Addition of recombinant nondegradable cyclin B activated p34cdc2 and PKA and induced the degradation of full-length cyclin B. Addition of cyclin A activated p34cdc2 but not PKA, nor did it induce the degradation of full-length cyclin B. These findings suggest that cyclin degradation and exit from mitosis require MPF-dependent activation of the cAMP-PKA pathway.

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