{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T17:05:11Z","timestamp":1791392711703,"version":"4.3.3"},"reference-count":42,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2003,5,1]],"date-time":"2003-05-01T00:00:00Z","timestamp":1051747200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2003,5]]},"abstract":"<jats:p>\n                    The role of endogenous GABA and ATP in regulating transmitter release from primary afferent terminals in the superficial dorsal horn of the spinal cord is still controversial. ATP is co\u2010released with GABA from some inhibitory dorsal horn neurons raising the possibility that ATP could act in concert with GABA to regulate transmitter release from primary afferent terminals if receptors to both transmitters are expressed there. Using electrophysiology together with immunocytochemistry, we have investigated the expression of ATP\u2010gated P2X and GABA\n                    <jats:sub>A<\/jats:sub>\n                    receptors by identified subpopulations of dorsal root ganglion (DRG) neurons known to project primarily to the superficial dorsal horn. Expression of the heat\u2010sensitive vanilloid receptor 1 (VR1) and sensitivity to capsaicin were used to characterize DRG neurons sensitive to noxious heat. Both P2X and GABA\n                    <jats:sub>A<\/jats:sub>\n                    receptors were expressed on the majority of DRG neurons examined. Recording compound action potentials (CAPs) from dorsal roots in the presence of muscimol, \u03b1,\u03b2\u2010methylene\u2010ATP (\u03b1,\u03b2\u2010meATP) or capsaicin resulted in depression of CAP in the slow and medium conducting fibres, indicating cognate receptor expression on the small diameter axons. Dorsal root\u2010evoked dorsal root potentials (DR\u2010DRPs), reflecting depolarization of primary afferent terminals by endogenously released substances, were depressed by the GABA\n                    <jats:sub>A<\/jats:sub>\n                    receptor antagonist SR95531 and \u03b1,\u03b2\u2010meATP. These results suggest that GABA\n                    <jats:sub>A<\/jats:sub>\n                    and P2X receptors are expressed on DRG cell bodies and slow fibre axons, many of which are heat\u2010nociceptive. These fibres project to the superficial lamina of the dorsal horn where the receptors may function to modulate transmitter release near their central terminals.\n                  <\/jats:p>","DOI":"10.1113\/jphysiol.2002.031963","type":"journal-article","created":{"date-parts":[[2003,5,14]],"date-time":"2003-05-14T21:19:07Z","timestamp":1052947147000},"page":"131-142","source":"Crossref","is-referenced-by-count":65,"title":["Localization and function of ATP and GABA\n                    <sub>A<\/sub>\n                    receptors expressed by nociceptors and other postnatal sensory neurons in 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