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RA Nicholas, WC Watt, ER Lazarowski, Q Li and K Harden
Department of Pharmacology, University of North Carolina, School of Medicine, Chapel Hill 27599-7365, USA. nicholas@med.unc.edu
Observation that the G protein-coupled P2U receptor (P2Y2 receptor) is activated by UTP as well as ATP provided the first indication that a class of uridine nucleotide-responsive receptors might exist. This hypothesis was confirmed by our identification of a uridine nucleotide- specific receptor on C6-2B rat glioma cells and by the recent cloning of two uridine nucleotide-responsive receptors, the P2Y6 receptor [J. Biol. Chem. 270:26152-26158 (1995)] and the P2Y4 receptor [J. Biol. Chem. 270:30849-30852 (1995) and J. Biol. Chem. 270:30845-30848 (1995)]. The relative nucleotide selectivities of these uridine nucleotide-activated receptors have not been established. Therefore, we cloned and expressed the P2Y6 and P2Y4 receptors in 1321N1 human astrocytoma cells and compared their relative selectivities for UDP, UTP, and other uridine and adenine nucleotides with that of the P2Y2 receptor expressed in the same cells. These comparisons were made by measuring inositol phosphate accumulation under conditions in which the initial purity and stability of agonists were rigidly ensured and quantitatively assessed. The data indicate that the P2Y2 receptor is activated with similar potencies by ATP and UTP but not by ADP or UDP; the P2Y6 receptor is activated most potently by UDP but weakly by UTP, ATP, and ADP; and the P2Y4 receptor is activated most potently by UTP, less potently by ATP, and not at all by nucleotide diphosphates. Furthermore, the P2Y6 receptor, which displays a uridine nucleotide selectivity essentially identical to that of the uridine nucleotide- specific receptor in C6-2B cells, was shown to be natively expressed in C6-2B cells and to account for the uridine nucleotide responses originally identified in these cells. These results define the uridine nucleotide selectivity of three phospholipase C-linked receptors: a receptor that is selectively activated by UDP (P2Y6 receptor), selectively activated by UTP (P2Y4 receptor), and activated by UTP and ATP but not by diphosphate nucleotides (P2Y2 receptor).
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