Title : Role of protein kinase C on the steroidogenic effect of angiotensin II in the rat adrenal glomerulosa cell.

Pub. Date : 1990 Jan

PMID : 2293979






6 Functional Relationships(s)
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1 Incubation of the cells with 100 nM 12-O-tetradecanoylphorbol-13-acetate (TPA) resulted in transient translocation of PKC activity to the membrane (15 min) which was followed by a 64% decrease in total cellular enzyme activity after 3 h. In PKC-depleted cells, the aldosterone response to ACTH was increased by 25% but AII-stimulated steroidogenesis was unchanged. Tetradecanoylphorbol Acetate angiotensinogen Rattus norvegicus
2 Incubation of the cells with 100 nM 12-O-tetradecanoylphorbol-13-acetate (TPA) resulted in transient translocation of PKC activity to the membrane (15 min) which was followed by a 64% decrease in total cellular enzyme activity after 3 h. In PKC-depleted cells, the aldosterone response to ACTH was increased by 25% but AII-stimulated steroidogenesis was unchanged. Tetradecanoylphorbol Acetate angiotensinogen Rattus norvegicus
3 In contrast, in cells in which PKC was translocated to the membrane by a 15 min preincubation with TPA, aldosterone response to AII was enhanced by 40%, while the response to ACTH was reduced by 30%; under these conditions membrane PKC levels rapidly returned to basal. Tetradecanoylphorbol Acetate angiotensinogen Rattus norvegicus
4 However, the changes in aldosterone response were still evident when addition of AII or ACTH was delayed for up to 30 min after removal of TPA, indicating a persistent modification in the cell membrane secondary to PKC activation. Tetradecanoylphorbol Acetate angiotensinogen Rattus norvegicus
5 However, the fact that aldosterone responses to AII are potentiated during TPA-induced PKC translocation to the membrane suggests that AII and phorbol esters do not share the same mechanism of action in the regulation of steroidogenesis. Tetradecanoylphorbol Acetate angiotensinogen Rattus norvegicus
6 However, the fact that aldosterone responses to AII are potentiated during TPA-induced PKC translocation to the membrane suggests that AII and phorbol esters do not share the same mechanism of action in the regulation of steroidogenesis. Tetradecanoylphorbol Acetate angiotensinogen Rattus norvegicus