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. 1978 Jun 15;172(3):433–442. doi: 10.1042/bj1720433

Adenosine 3′:5′-cyclic monophosphate-dependent protein kinase(s) of rat ovarian cells. Gonadotropin regulation of adenosine 3′:5′-cyclic monophosphate-receptor activity

K M Jairam Menon 1, Salman Azhar 1
PMCID: PMC1185717  PMID: 210760

Abstract

Regulation of cyclic AMP-dependent protein kinase, cyclic AMP-receptor activity and intracellular cyclic AMP concentrations by choriogonadotropin was studied in ovarian cells prepared from 26-day-old rats. A close correlation was observed between phospho-transferase activity and cyclic AMP-receptor activity in 12000g supernatant fractions from rat ovarian homogenate. The apparent activation constant (Ka) and I50 (concentration required to produce 50% inhibition) of different cyclic nucleotides for phosphotransferase and cyclic AMP receptor activities respectively were also determined. Cyclic AMP and 8-bromo cyclic AMP were most effective, giving Ka values of 0.08 and 0.09μm and I50 of 0.12 and 0.16μm respectively. Other nucleotides were also effective, but required higher concentrations to give a comparable effect. An increased concentration of cyclic AMP produced by choriogonadotropin (1μg/ml) treatment was accompanied by decreased cyclic AMP binding as early as 5min after hormone addition. Choriogonadotropin also stimulated the protein kinase activity ratio (−cyclic AMP/+cyclic AMP) under identical experimental conditions. The phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine potentiated the action of choriogonadotropin on the three parameters measured in a dose- and time-dependent manner. The maximal cyclic AMP-binding capacity, as determined by cyclic AMP-exchange assay, remained unchanged before and after hormone addition. The endogenously bound cyclic AMP was determined from the difference between the maximal binding capacity and the exogenously bound cyclic AMP. With different choriogonadotropin concentrations, a quantitative correlation was established between maximal binding capacity, exogenous binding and endogenous binding activities. Approx. 60% of total binding sites were endogenously occupied in untreated cells, and choriogonadotropin (1μg/ml) treatment fully saturated available binding sites with a parallel 10-fold increase in cellular cyclic AMP. The present results provide evidence for a probable intracellular compartmentalization of cyclic AMP in the ovarian cell, and suggest that in the unstimulated state all cyclic AMP present in the ovarian cell may not be available for protein kinase activation.

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Selected References

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