Abstract
Latexin, the endogenous protein inhibitor of the A/B subfamily of metallocarboxypeptidases, is expressed in small nociceptive neurons in sensory ganglia and in a subset of neurons in the telencephalon. In this study, we generated latexin-deficient mice that exhibited increased tail-flick latency compared to wild-type animals upon noxious heat stimulation. The reduced pain sensitivity in the mutants was rescued by the systemic administration of a plant carboxypeptidase inhibitor that inhibits the A/B subfamily of metallocarboxypeptidases. These findings suggest that latexin is involved in the transmission of pain.
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