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• W2028480100 abstract "Synthetic human β-endorphin, 7.25 nmol intracisternally, in conscious, freely moving, cannulated adult male rats increased plasma concentrations of the 3 catecholamines, epinephrine, norepinephrine and dopamine. Similarly administered equimolar morphine increased only plasma epinephrine concentration significantly. A 10-fold greater intracisternal dose of morphine significantly increased plasma concentrations of all 3 catecholamines. This effect was inhibited by prior intra-arterial naloxone administration. Intracisternal administration of the selective μ receptor agonist [d-Ala2,NMe-Phe4,Gly-ol5]enkephalin (DAGO), 2.9 nmol, also increased plasma concentrations of the 3 catecholamines and, furthermore, these effects were significantly greater than those noted in response to equimolar β-endorphin. The greater potency of DAGO than β-endorphin to increase catecholamine secretion suggests that this opioid peptide-induced effect is mediated at μ receptors. Administration of DAGO, 0.1 nmol, directly into either the hypothalamic paraventricular nucleus (PVN) or brainstem nucleus of the solitary tract (NTS) significantly increased plasma concentrations of all 3 catecholamines when compared with either saline-infused controls or animals administered DAGO into other brain areas. These catecholamine-stimulating effects of DAGO administered into either PVN or NTS were prevented by prior intra-arterial naloxone administration. Heart rate, but not mean arterial blood pressure, increased in response to DAGO administration into the NTS while no significant cardiovascular changes were noted among the experimental groups in response to DAGO administered into the PVN. These data support a hypothesis that μ receptors at discrete and anatomically distant brain sites mediate opioid peptide-induced catecholamine secretion through activation of the central sympathetic outflow to the adrenal medulla and sympathetic nerve terminals." @default.
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• W2028480100 date "1986-07-01" @default.
• W2028480100 modified "2023-10-18" @default.
• W2028480100 title "Mu receptors at discrete hypothalamic and brainstem sites mediate opioid peptide-induced increases in central sympathetic outflow" @default.
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• W2028480100 doi "https://doi.org/10.1016/0006-8993(86)90281-7" @default.
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