Abstract
Systemic administration of local anesthetics has been shown to transiently reverse thermal and tactile hypersensitivity induced by peripheral nerve injury, effects that have been taken as suggesting direct actions on the peripheral nerves. The present study sought to determine whether a central site of action could contribute to, or account for, the effects of lidocaine on nerve injury-induced thermal and tactile hypersensitivity. Systemic lidocaine and its peripherally restricted analogues, QX-314 or QX-222, effectively reversed thermal hypersensitivity after spinal nerve ligation injury. Nerve injury-induced tactile hypersensitivity, however, was reversed by systemic lidocaine but not QX-314 or QX-222. Microinjection of either lidocaine or QX-314 into the rostral ventromedial medulla fully reversed spinal nerve ligation-induced thermal and tactile hypersensitivity. The data strongly suggest that nerve injury-induced thermal and tactile hypersensitivity are mediated through different mechanisms. In addition, the present study supports a prominent contribution of the central nervous system in the activity of systemically given lidocaine against nerve injury-induced tactile and thermal hypersensitivity. Thus, lidocaine might rev...Continue Reading
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