| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
Analgesic mechanisms of systemic administration of lidocaine have not fully elucidated. We hypothesized that the one of the lidocaine metabolites, monoethylglycinexylidide (MEGX), had the analgesic action on spinal dorsal horn. First, we used whole-cell patch clamp recording from rat dorsal horn neurons. MEGX inhibited the excitatory synaptic transmission. In contrast, MEGX facilitated the inhibitory synaptic transmission in half of recording cells. However, MEGX did not affect the amplitudes of evoked-excitatory postsynaptic currents induced by the dorsal root electrical stimuli.
Then, we tested analgesic efficacy of MEGX using plantar incision model mice by behavioral analysis. Response rate to von Frey stimuli for a hindpaw was decreased by intrathecal injection of MEGX.
These results suggest that MEGX affects synaptic transmission in spinal dorsal horn neurons and exerts an analgesic action.
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