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- W2297556377 abstract "The effect of alpha-2 adrenergic receptor antagonists on sympathetic nerve discharge (SND) recorded from the external carotid and splanchnic nerves were studied in baroreceptor-denervated cats. Low i.v. doses of piperoxane and rauwolscine dramatically increased SND and produced a concomitant rise in mean arterial pressure and heart rate. High doses of piperoxane also resulted in an increase in SND. High doses of rauwolscine, however, markedly reduced mean arterial pressure, heart rate and SND. The pressor response to i.v. norepinephrine was greatly attenuated by high doses of rauwolscine and slightly reduced by piperoxane. Piperoxane failed to alter SND in catecholamine-depleted animals. In vitro binding experiments indicated that piperoxane and rauwolscine bound selectively to the alpha-2 adrenergic receptor and had little affinity for alpha-1 receptor sites. In addition, rauwolscine displaced [3H]LSD binding. These data indicate that low doses of the alpha-2 receptor antagonist piperoxane and rauwolscine act centrally to increase SND. In addition, the nature of the interactions between central noradrenergic neurons and neurons involved in the genesis of sympathetic nerve activity is discussed." @default.
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- W2297556377 date "1983-03-01" @default.
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- W2297556377 title "Evidence for a central sympathoexcitatory action of alpha-2 adrenergic antagonists." @default.
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