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. 1991 May;87(5):1732–1738. doi: 10.1172/JCI115191

ATP receptor regulation of adenylate cyclase and protein kinase C activity in cultured renal LLC-PK1 cells.

R J Anderson 1, R Breckon 1, B S Dixon 1
PMCID: PMC295279  PMID: 1850760

Abstract

In cultured intact LLC-PK1 renal epithelial cells, a nonhydrolyzable ATP analogue, ATP gamma S, inhibits AVP-stimulated cAMP formation. In LLC-PK1 membranes, several ATP analogues inhibit basal, GTP-, forskolin-, and AVP-stimulated adenylate cyclase activity in a dose-dependent manner. The rank order potency of inhibition by ATP analogues suggests that a P2y type of ATP receptor is involved in this inhibition. The compound ATP gamma S inhibits agonist-stimulated adenylate cyclase activity in solubilized and in isobutylmethylxanthine (IBMX) and quinacrine pretreated membranes, suggesting that ATP gamma S inhibition occurs independent of AVP and A1 adenosine receptors and of phospholipase A2 activity. The ATP gamma S inhibition of AVP-stimulated adenylate cyclase activity is not affected by pertussis toxin but is attenuated by GDP beta S, suggesting a possible role for a pertussis toxin insensitive G protein in the inhibition. Exposure of intact LLC-PK cells to ATP gamma S results in a significant increase in protein kinase C activity. However, neither of two protein kinase C inhibitors (staurosporine and H-7) prevents ATP gamma S inhibition of AVP-stimulated adenylate cyclase activity, suggesting that this inhibition occurs by a protein kinase C independent mechanism. These findings suggest the presence of functional P2y purinoceptors coupled to two signal transduction pathways in cultured renal epithelial cells. The effect of P2y purinoceptors to inhibit AVP-stimulated adenylate cyclase activity may be mediated, at least in part, by a pertussis toxin insensitive G protein.

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Selected References

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