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• W1989333670 abstract "Pontine A5, A6 (locus coeruleus) and A7 cell groups provide noradrenergic innervation of the spinal cord. Here, we assessed whether activation of α(2) -adrenoceptors in A7 influences peripheral nerve injury-induced hypersensitivity in the rat, and whether spinal α(2) -adrenoceptors mediate the descending effect. Fadolmidine, an α(2) -adrenoceptor agonist that because of its pharmacokinetic properties has a limited spread from the injection site, was microinjected through a chronic guide cannula into A7 or for comparison into A6 ipsilateral to the nerve injury. Moreover, atipamezole, an α(2) -adrenoceptor antagonist, was injected intrathecally in an attempt to reverse the possible antihypersensitivity effect. Tactile hypersensitivity was assessed in the injured limb by determining limb withdrawal evoked by calibrated monofilaments, mechanical hyperalgesia by determining withdrawal evoked by noxious mechanical stimulation of the paw, and thermal nociception by assessing heat-induced withdrawal of the intact tail. Fadolmidine (1.0 or 3.0 μg) in A7, but not in A6, produced a tactile antihypersensitivity effect. Intrathecal atipamezole (5 μg) reversed the tactile antihypersensitivity effect by fadolmidine in A7. Atipamezole alone (5.0 μg) intrathecally or in A7 failed to influence tactile hypersensitivity. Fadolmidine in A7 failed to influence mechanical hyperalgesia or heat nociception at doses that produced a tactile antihypersensitivity effect. We propose that tonic noradrenergic drive of A6 by A7 promotes neuropathic hypersensitivity by suppressing descending noradrenergic inhibition originating in A6. Consequently, the activation of inhibitory α(2) -adrenoceptors within the pontine A7 cell group suppresses neuropathic hypersensitivity by disinhibiting A6 and its descending noradrenergic pathways acting on spinal α(2) -adrenoceptors." @default.
• W1989333670 created "2016-06-24" @default.
• W1989333670 creator A5005184266 @default.
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• W1989333670 date "2012-09-25" @default.
• W1989333670 modified "2023-10-17" @default.
• W1989333670 title "Regulation of Neuropathic Hypersensitivity by α2-Adrenoceptors in the Pontine A7 Cell Group" @default.
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• W1989333670 doi "https://doi.org/10.1111/j.1742-7843.2012.00930.x" @default.
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