Abstract

In the second messenger concept, adenylate cyclase and its hormonal receptors translate specific extracellular signals into intracellular cyclic adenosine 3′:5′-monophosphate (cyclic AMP) production. Cyclic AMP, in turn, interacts with the regulatory subunits of protein kinase, and also is degraded into 5’-AMP by cyclic nucleotide 3’:5’-phosphodiesterase (phosphodiesterase) (1). For these reasons it is common to use measurements of adenylate cyclase activities and phosphodiesterase activities in cell-free preparations as indicators of the kinetics of cyclic AMP metabolism in intact cells. Alternatively, the accumulation of cyclic AMP in intact cells often is viewed as a measure of the rate of intracellular production and destruction of cyclic AMP. In this report we would like to discuss these notions.

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