Abstract
Extracellular ATP activates cell-surface metabotropic and ionotropic nucleotide (P2) receptors in vascular, neural, connective, and immune tissues. These P2 receptors mediate a wealth of physiological processes, including nitric oxide-dependent vasodilation of vascular smooth muscle and fast excitatory neurotransmission in sensory afferents. Although ATP is now recognized as a signaling molecule, the cellular and molecular mechanisms underlying its actions have been difficult to study due to the absence of selective P2 receptor antagonists and cloned receptor genes. Nonetheless, five mammalian P2 receptor subtypes have been tentatively assigned based solely on agonist specificity and signaling properties. Here we report the cloning of a mouse cDNA encoding a P2 receptor that shares striking homology with several G protein-coupled peptide receptors. When expressed in Xenopus laevis oocytes, the cloned receptor resembles a metabotropic P2U receptor; activation by either ATP or UTP elicits the mobilization of intracellular calcium. mRNA encoding the P2U purinergic receptor is found in neural and nonneural tissues.
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