In this study, we investigated the effect of histamine on capsaicin-induced current and its influence by suplatast in rat trigeminal ganglia neurons using a patch-clamp technique. We found that histamine directly potentiated capsaicin-induced currents in rat sensory neurons, and suplatast had little effect on this potentiation. Since it has been known that suplatast suppresses histamine release from mast cells, it is possible that suplatast inhibits the activation of nociceptive fibers in the pathological condition via prevention of histamine-induced potentiation of the transient receptor potential vanilloid 1 receptor-mediated currents.

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