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- W2000695181 abstract "Systemic (s.c.) administration of α2 agonists clonidine (25–100 μg/kg) or guanfacine (50–400 μg/kg) elicited antinociception as assessed by the cat tail-flick model and potentiated in a dose-dependent manner the antinociceptive effect of etorphine (2.5 μg) administered directly into the periaqueductal gray. Conversely, systemic yohimbine (1 mg/kg) attenuated the effects of central etorphine, and diminished potentiation of etorphine by theα2 agonists. Prior microinjection of clonidine (5μg) or guanfacine (5 μg) into the locus coeruleus (LC) reduced the intensity of central etorphine antinociception whereas central yohimbine (20 μg) pretreatment increased peak antinociceptive activity and prolonged the duration of etorphine. Thus, systemicα2 agonists are inherently antinociceptive and potentiate central narcotic antinociception; however, the site of interaction betweenα2 agonists and opiates does not appear to be the LC inasmuch asα2 agonists attenuate the antinociceptive effect of etorphine when administered directly into the LC. A spinal site of action is suggested based upon known LC-spinal projections and our experimental observations." @default.
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- W2000695181 date "1984-08-01" @default.
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- W2000695181 title "Effect of α2 adrenergic agents upon central etorphine antinociception in the cat" @default.
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- W2000695181 doi "https://doi.org/10.1016/0006-8993(84)91017-5" @default.
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