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. 1987 Apr;84(8):2282–2286. doi: 10.1073/pnas.84.8.2282

Protein kinase C activation enhances cAMP accumulation in Swiss 3T3 cells: inhibition by pertussis toxin.

E Rozengurt, M Murray, I Zachary, M Collins
PMCID: PMC304634  PMID: 3031676

Abstract

Addition of phorbol 12,13-dibutyrate (PBt2) in the presence of forskolin or cholera toxin caused marked (6- to 8-fold) and rapid accumulation of cAMP in Swiss 3T3 cells. The effect of PBt2 is mediated by protein kinase C because the synthetic diacylglycerol 1-oleoyl-2 acetylglycerol substitutes for PBt2 in enhancing cAMP accumulation and because the enhancing effect of either PBt2 or 1-oleoyl-2-acetylglycerol was prevented by down-regulation of protein kinase C. Vasopressin, which activates protein kinase C but does not directly affect adenylate cyclase in 3T3 cells, also enhanced cAMP accumulation in cells treated with cholera toxin or forskolin. This effect was abolished by down-regulation of protein kinase C. Treatment with pertussis toxin blocked the enhancing effect of PBt2 in a concentration- and time-dependent manner. Pertussis toxin neither prevented protein kinase C activation by PBt2 nor other biologic responses elicited by PBt2. The results presented here suggest an unusual function for a pertussis toxin substrate--namely, coupling protein kinase C activation to cAMP production.

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Selected References

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