Mice that are homozygous null for the <i>P2rx3</i> gene are viable, fertile, normal in size and do not display any gross physical abnormalities. A significantly decreased nociceptive response (hindpaw lifting, licking, biting) is observed in response to injection of ATP, and to a lesser extent formalin. Responses to noxious thermal and mechanical stimuli are similar to that seen in wild-type mice. Aged mice may develop cutaneous hypersensitivity. Mice also exhibit urinary bladder hyporeflexia, characterized by decreased micturition (urination) frequencies and increased bladder capacities. Whole-cell patch-clamp analysis indicates that homozygote null mice lose the rapidly desensitizing ATP-induced currents in dorsal root ganglion. This strain is suitable for use in studies examining afferent sensory pathways.

These <i> P2rx3</i> knock-out mice exhibit a marked urinary bladder hyporeflexia along with reduced pain-related behavior in response to injection of ATP and formalin.

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