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. 1985 Aug;5(8):1984–1992. doi: 10.1128/mcb.5.8.1984

Clonal variants of PC12 pheochromocytoma cells with defects in cAMP-dependent protein kinases induce ornithine decarboxylase in response to nerve growth factor but not to adenosine agonists.

R Van Buskirk, T Corcoran, J A Wagner
PMCID: PMC366916  PMID: 3018542

Abstract

We have isolated and partially characterized three mutants of the pheochromocytoma line PC12 by using dibutyryl cyclic AMP (cAMP) as a selective agent. Each of these variants, A126-1B2, A208-4, and A208-7, was resistant to both dibutyryl cAMP and cholera toxin when cell growth was measured. In comparison to wild-type PC12 cells, each of these mutants was deficient in the ability to induce ornithine decarboxylase (ODC) in response to agents that act via a cAMP-dependent pathway. In contrast, each of these mutants induced ODC in response to nerve growth factor. To understand the nature of the mutations, the cAMP-dependent protein kinases of the wild type and of each of these mutants were studied by measuring both histone kinase activity and 8-N3-[32P]cAMP labeling. Wild-type PC12 cells contained both cAMP-dependent protein kinase type I (cAMP-PKI) and cAMP-dependent protein kinase type II (cAMP-PKII). Regulatory subunits were detected in both soluble and particulate fractions. The mutant A126-1B2 contained near wild-type PC12 levels of cAMP-PKI but greatly reduced levels of cAMP-PKII. Furthermore, when compared with wild-type PC12 cells, this cell line had an altered distribution in ion-exchange chromatography of regulatory subunits of cAMP-PKI and cAMP-PKII. The mutant A208-4 demonstrated wild-type-level binding of 8-N3-[32P]cAMP to both type I and type II regulatory subunits, but only half the wild-type level of type II catalytic activity. The mutant A208-7 had type I and type II catalytic activities equivalent to those in wild-type cells. However, the regulatory subunit of cAMP-PKI occurring in A208-7 demonstrated decreased levels of binding 8-N3-[32P]cAMP in comparison with the wild type. Furthermore, all mutants were defective in their abilities to bind 8-N3-[32P]cAMP to the type II regulatory protein in the particulate fraction. Thus, cAMP-PK was altered in each of these mutants. We conclude that both cAMP-PKI and cAMP-PKII are apparently required to induce ODC in response to increases in cAMP. Finally, since all three mutants induced ODC in response to nerve growth factor, the nerve growth factor-dependent induction of OCD was not mediated by an increase in cAMP that led to an activation of cAMP-PK. These mutants will be useful in the elucidation of the many functions controlled by cAMP and nerve growth factor.

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Selected References

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