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- W2083438975 abstract "Chronic-constriction injury (CCI) of the sciatic nerve causes mechanical and heat hyperalgesia and mechanical allodynia in the plantar surface of the hindpaw. The underlying mechanism thought to account for these phenomena include central sensitization induced by peripheral nerve injury, ie, the increase in neuronal activity of spinal dorsal horn neurons. As a marker of neuronal activation of the central nervous system, Fos expression has been used widely to monitor the change in neuronal activity evoked by peripheral input. In this study, we examined the antinociceptive effect of electroacupuncture (EA) on pain behavior and noxious stimulus-evoked Fos expression in dorsal horn neurons of the spinal cord in CCI rats 14 days after injury. Male Sprague-Dawley rats (180 to 200 g) received loose ligation of the left sciatic nerve. Heat and mechanical hyperalgesia and mechanical allodynia were examined by the plantar foot test, the pin-prick test, and the von Frey test before and after the EA treatment (100 Hz, 0.3 millisecond, 3 or 1 mA, 20 minutes) into the Zusanli point (S36). When EA stimulation to the Zusanli point was applied, the mechanical and heat hyperalgesia were significantly suppressed; however, mechanical allodynia was not affected. The EA stimulation to nonacupuncture point did not show any significant effect. Next, pinch stimulation was applied to the plantar surface of the operated hindpaw of the CCI rats for 10 minutes, and the stimulus-evoked Fos expression in dorsal horn neurons in L4-L6 spinal cord levels was then examined by using immunohistochemistry. The number of noxious stimulus-evoked Fos-labeled neurons in both the superficial and deep laminae of the dorsal horn in the CCI rats was increased significantly compared with those in sham-operated rats, suggesting an increased excitability of dorsal horn neurons to noxious stimuli. Concurrent EA treatment to the Zusanli point with the pinch stimulus suppressed the increase in the number of Fos-labeled cells in the spinal dorsal horn in the CCI rats. The present results show that EA treatment has antinociceptive effects on both pain behavior and neuronal activation of the spinal dorsal horn neurons in CCI rats." @default.
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- W2083438975 date "2001-06-01" @default.
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- W2083438975 title "The effect of electroacupuncture on pain behaviors and noxious stimulus-evoked Fos expression in a rat model of neuropathic pain" @default.
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- W2083438975 doi "https://doi.org/10.1054/jpai.2001.19964" @default.
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