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• W1992856777 abstract "The objective of this study was to explore the effects of the endogenous opioid peptide dynorphin A(1-13) on the CNS regulation of blood pressure and heart rate. Wistar rats, anesthetized with pentobarbital and halothane, received dynorphin A(1-13) microinjected into the anterior hypothalamus area (AHA), the posterior hypothalamic area (PHA), the nucleus tractus solitarius (NTS), or the lateral cerebral ventricle (ICV). Dynorphin A(1-13), 20 (12 nmol) or 30 micrograms ICV, produced significant (p < 0.05) reductions in blood pressure and heart rate. Naloxone, 50 micrograms/kg ICV, completely prevented the blood pressure response and significantly (p < 0.05) blunted the heart rate response to the highest dynorphin concentration, 30 micrograms ICV (18 nmol). Dynorphin A(1-13), 5 micrograms, in the NTS significantly (p < 0.05) decreased systolic and diastolic blood pressure and heart rate with the response being evident 10 min and persisting for 30 min after injection. In contrast, the same dose of dynorphin A(1-13) in the AHA produced an immediate, marked, and significant (p < 0.05) decrease in systolic and diastolic blood pressure and heart rate that attained its maximum 1-3 min and returned rapidly towards baseline levels. Dynorphin A(1-13), 5 or 10 micrograms in the posterior hypothalamic area, was not associated with any change in blood pressure or heart rate. Injection of the diluent at any site was not associated with any changes in blood pressure or heart rate. The maximum change in blood pressure with dynorphin was greater in the AHA than NTS, and the maximum change in heart rate was greater in the NTS than AHA.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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• W1992856777 date "1993-11-01" @default.
• W1992856777 modified "2023-10-16" @default.
• W1992856777 title "Comparative effects on blood pressure and heart rate of dynorphin A(1–13) in anterior hypothalamic area, posterior hypothalamic area, nucleus tractus solitarius, and lateral cerebral ventricle in the rat" @default.
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• W1992856777 doi "https://doi.org/10.1016/0196-9781(93)90184-i" @default.
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