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. 1973 Dec;70(12 Pt 1-2):3802–3805. doi: 10.1073/pnas.70.12.3802

Interrelationship Between Adenylate Cyclase Activity, Adenosine 3′:5′ Cyclic Monophosphate Phosphodiesterase Activity, Adenosine 3′:5′ Cyclic Monophosphate Levels, and Growth of Cells in Culture

Wayne B Anderson 1, Thomas R Russell 1, Richard A Carchman 1,*, Ira Pastan 1
PMCID: PMC427332  PMID: 4359490

Abstract

To investigate how cell population density influences the intracellular concentration of cyclic AMP we have measured adenylate cyclase and cyclic AMP phosphodiesterase activities and cyclic AMP levels at various stages of cell density in normal rat-kidney (NRK) cells, which exhibit contact-inhibition of growth, and in normal chick-embryo fibroblasts (CEF), which do not show contact inhibition of growth under our conditions. Until NRK cells reach confluency, both activities increase with increasing cell population and cyclic AMP levels are low. As NRK cells reach confluency, cyclic AMP phosphodiesterase activity decreases somewhat whereas adenylate cyclase activity continues to rise. This increase in synthetic ability is accompanied by the increase in cyclic AMP levels which occurs in these cells at confluency. In CEF grown in 5% serum where density-dependent inhibition of growth is not observed, both adenylate cyclase and cyclic AMP phosphodiesterase activities increase proportionately with increasing cell population density. No significant alteration occurs in the ratio between these two enzyme activities and no change is observed in cyclic AMP levels.

The NaF-stimulated activity in NRK cells increases with increasing cell density until the cells reach confluency; thereafter the NaF-stimulated activity remains constant. In contrast, the NaF-stimulated activity observed in CEF does not vary appreciably between light and heavy density.

The observed changes in the enzymes of cyclic AMP metabolism accurately reflect the changes in cyclic AMP concentration as a function of cell population density. The data indicate that these two enzyme activities respond to increasing cell density to elicit a rise in intracellular cyclic AMP levels. The elevated cyclic AMP levels are thought to be involved in the regulation of cellular growth rate and the mediation of contact inhibition of growth.

Keywords: contact inhibition of growth, NRK cells, CEF

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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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