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• W1985780560 endingPage "361" @default.
• W1985780560 startingPage "351" @default.
• W1985780560 abstract "The purpose of this study was to investigate the allodynic effect of bicuculline (BIC) given topically to the dorsal surface of the rat spinal cord, and to determine if spinal prostaglandins (PGs) mediate the allodynic state arising from spinal GABAA-receptor blockade. Male Sprague–Dawley rats (325–400 g) were anaesthetized with halothane and maintained with urethane for the continuous monitoring of blood pressure (MAP), heart rate (HR) and cortical electroencephalogram (EEG). A laminectomy was performed to expose the dorsal surface of the spinal cord. Unilateral application of BIC (0.1 μg in 0.1 μl) to the L5 or L6 spinal segment induced a highly localized allodynia (e.g. one or two digits) on the ipsilateral hind paw. Thus, hair deflection (brushing the hair with a cotton-tipped applicator) in the presence, but not absence of BIC, evoked an increase in MAP and HR, abrupt motor responses (MR; e.g. withdrawal of the hind leg, kicking, and/or scratching) on the affected side, and desynchrony of the EEG. BIC-allodynia was dose-dependent, yielding ED50’s (95% CI's) of 45 ng (31–65) for MAP; 68 ng (46–101) for HR and 76 ng (60–97) for MR. Allodynia was sustained for up to 2 h with repeated BIC application without any detectable change in the location or area of peripheral sensitization. Pretreatment with either the EP1- receptor antagonist, SC-51322, the cyclooxygenase (COX)-2 selective inhibitor, NS-398, or the NMDA-receptor antagonist, AP-7, inhibited BIC-allodynia in a dose-dependent manner. The results demonstrate: (a) BIC, applied to the dorsal surface of the spinal cord, induces highly localized allodynia; (b) this effect can be sustained with repeated BIC application; (c) it is evoked by NMDA-dependent afferent input; (d) spinal PGs are synthesized by constitutive COX-2 during BIC-allodynia; and (e) spinal PGs contribute to the abnormal processing of tactile input via spinal EP1-receptors." @default.
• W1985780560 created "2016-06-24" @default.
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• W1985780560 date "2001-06-01" @default.
• W1985780560 modified "2023-10-05" @default.
• W1985780560 title "Topical bicuculline to the rat spinal cord induces highly localized allodynia that is mediated by spinal prostaglandins" @default.
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• W1985780560 doi "https://doi.org/10.1016/s0304-3959(01)00276-7" @default.
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