Differential Coupling of the Human P2Y(11) Receptor to Phospholipase C and Adenylyl Cyclase

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 2001 Jan 13

PMID 11156592

Citations 31

Authors

A D Qi

C Kennedy

T K Harden

R A Nicholas

Affiliations

Soon will be listed here.

Abstract

1. The human P2Y(11) (hP2Y(11)) receptor was stably expressed in two cell lines, 1321N1 human astrocytoma cells (1321N1-hP2Y(11)) and Chinese hamster ovary cells (CHO-hP2Y(11)), and its coupling to phospholipase C and adenylyl cyclase was assessed. 2. In 1321N1-hP2Y(11) cells, ATP promoted inositol phosphate (IP) accumulation with low microM potency (EC(50)=8.5+/-0.1 microM), whereas it was 15 fold less potent (130+/-10 microM) in evoking cyclic AMP production. 3. In CHO-hP2Y(11) cells, ATP promoted IP accumulation with slightly higher potency (EC(50)=3.6+/-1.3 microM) than in 1321N1-hP2Y(11) cells, but it was still 15 fold less potent in promoting cyclic AMP accumulation (EC(50)=62.4+/-15.6 microM) than for IP accumulation. Comparable differences in potencies for promoting the two second messenger responses were observed with other adenosine nucleotide analogues. 4. In 1321N1-hP2Y(11) and CHO-hP2Y(11) cells, down regulation of PKC by chronic treatment with phorbol ester decreased ATP-promoted cyclic AMP accumulation by 60--80% (P<0.001) with no change in its potency. Likewise, chelation of intracellular Ca(2+) decreased ATP-promoted cyclic AMP accumulation by approximately 45% in 1321N1-hP2Y(11) cells, whereas chelation had no effect on either the efficacy or potency of ATP in CHO-hP2Y(11) cells. 5. We conclude that coupling of hP2Y(11) receptors to adenylyl cyclase in these cell lines is much weaker than coupling to phospholipase C, and that activation of PKC and intracellular Ca(2+) mobilization as consequences of inositol lipid hydrolysis potentiates the capacity of ATP to increase cyclic AMP accumulation in both 1321N1-hP2Y(11) and CHO-hP2Y(11) cells.

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