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- W2025853810 abstract "The majority of adenosine triphosphate (ATP)-induced nociceptive transduction and pain has been attributed to ionotropic P2X3 receptors. Metabotropic P2Y receptors, some of which bind pyrimidines as well as purines, have received little attention. Here we have examined the ability of P2Y receptor signaling to evoke action potential firing in functionally identified afferent fibers using the skin nerve preparation from adult mouse. The P2Y2/P2Y4 ligand UTP activated sustained action potential firing in 54% of C fibers in a concentration-dependent manner. The effect was specific for P2Y2/P2Y4 receptors, as the P2Y6 ligand UDP never activated C fibers. In comparison to C fibers, few thinly myelinated A-mechanoreceptors (AM) (12%) were activated by UTP. The majority (70–80%) of the UTP-sensitive C and Aδ fibers responded to the algogen capsaicin with a barrage of action potentials, whereas the UTP-insensitive fibers were largely unresponsive to capsaicin. Furthermore, 86% of the UTP-sensitive C fibers and 100% of the UTP-sensitive AM fibers also responded to the P2X agonist α,β-methylene ATP, indicating that P2Y and P2X receptors are widely co-expressed. Surprisingly, a significant proportion (20–40%) of low threshold slowly and rapidly adapting Aβ fibers were also activated by UTP and α,β-methylene ATP. These data indicate that P2Y receptors on the terminals of capsaicin-sensitive cutaneous sensory neurons effectively evoke nociceptive transmission, and support the hypothesis that UTP may be an endogenous nociceptive messenger. Furthermore, P2Y signaling may contribute to mechanotransduction in low threshold Aβ fibers under normal or pathological conditions." @default.
- W2025853810 created "2016-06-24" @default.
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- W2025853810 creator A5040894139 @default.
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- W2025853810 date "2004-05-01" @default.
- W2025853810 modified "2023-10-12" @default.
- W2025853810 title "The P2Y agonist UTP activates cutaneous afferent fibers" @default.
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- W2025853810 doi "https://doi.org/10.1016/j.pain.2004.01.007" @default.
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