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. 1982 Jan 15;202(1):125–132. doi: 10.1042/bj2020125

Simulations of the roles of multiple cyclic nucleotide phosphodiesterases.

C H Reynolds
PMCID: PMC1158081  PMID: 6282269

Abstract

1. Simulations were performed using a model for cellular cyclic AMP metabolism involving a hormone-activated adenylate cyclase and two cyclic nucleotide phosphodiesterases with different Michaelis constants. 2. The response curves of cyclic AMP concentration as a function of hormone concentration were affected by regulating the phosphodiesterases. The maximum velocity of the high-affinity phosphodiesterase (V1) was important in determining the position of the response curve; when v1 was less than the maximal activity of adenylate cyclase (Vc), sigmoid response curves were readily produced. The maximum attainable concentration of cyclic AMP was determined primarily by V1 when Vc less than V1, and primarily by the activity of the low-affinity enzyme when Vc greater than V1 (V2 much greater than Vc in all cases). 3. The glucagon-stimulated adenylate cyclase and insulin-stimulated phosphodiesterase of the rat liver plasma membrane were simulated using experimentally determined values for the enzyme-kinetic parameters, and a considerable potential for regulation of the system by insulin was demonstrated. 4. Other possible functions for the regulation of phosphodiesterases are considered, in particular the value of increasing the speed of response to decreases in hormone concentration.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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