Development of novel treatment on masticatory muscle pain with TMD

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The mean percentage of FG-labeled P2X3R-positive neurons was significantly increased in TG following successive IL-1beta injections into the MM for 7 days. Successive administration of an IL-1beta receptor-antagonist into the MM attenuated the increase of P2X3-IR cells in the TG. ATP release from MM after 300-g pressure stimulation of MM was also significantly enhanced after CMM. Administration into MM of the selective P2X3,2/3 receptor antagonist A-317491 attenuated the decrement of HWT in CMM rats. A significant increase in HWT was also observed at 30 min after A-317491 (60 µg) injection in IL-1beta-injected rats. These findings suggest that P2X3R expression associated with enhanced IL-1beta expression and ATP release in MM has a possible important role in MM mechanical hyperalgesia after excessive muscular contraction.