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. 1979 Jul;76(7):3251–3255. doi: 10.1073/pnas.76.7.3251

Presence of free cyclic AMP receptor protein and regulation of its level by cyclic AMP in neuroblastoma-glioma hybrid cells.

U Walter, M R Costa, X O Breakefield, P Greengard
PMCID: PMC383802  PMID: 226964

Abstract

Neuroblastoma-glioma hybrid cells of line 108CC-5 were found to contain high levels of soluble adenosine 3',5'-cyclic monophosphate (cAMP)-dependent protein kinase activity and high levels of two specific cAMP receptor proteins, RI and RII. Treatment of the hybrid cells with dibutyryl cAMP increased the level of RI but did not significantly affect the level either of RII or of cAMP-dependent protein kinase activity. The effect of dibutyryl cAMP could be mimicked by prostaglandin E1 and 3-isobutyl-1-methylxanthine, both of which are known to raise cAMP levels in neuroblastoma-glioma hybrid cells. Both in control as well as in dibutyryl cAMP-treated cells, RII but not RI was associated with cAMP-dependent protein kinase. Several lines of evidence suggest that RI represents the free regulatory subunit of type I cAMP-dependent protein kinase. The presence of this regulatory subunit as free cAMP receptor protein in neuroblastoma-glioma hybrid cells may be of significance with respect to the regulation of growth and differentiation in tumor cells.

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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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