NDLI: 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.

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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.

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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.

Content Provider	PubMed Central
Author	Buskirk, R. Van Corcoran, T. Wagner, J. A.
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.
Starting Page	1984
File Format	PDF
ISSN	10985549
e-ISSN	10985549
Journal	Molecular and Cellular Biology
Issue Number	8
Volume Number	5
Language	English
Publisher Date	1985-08-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology

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