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- W2076848966 abstract "Beta-endorphin (beta-END) a product of the proopiomelanocortin (POMC) has been demonstrated to play a role in the regulation of metabolic and autonomic responses. Recent studies have suggested the involvement of the endogenous opioid system in cardiovascular control. Previous studies conducted in our laboratory using anesthetized animals investigated the actions of beta-END and other POMC derived peptides on sympathetic and cardiovascular dynamics. In this study, we determined both the acute and chronic effects of beta-END on cardiovascular and behavioral dynamics in conscious unrestrained rats using radio-telemetry. Animals were instrumented with a radio-telemetry transmitter in the abdominal cavity and the attached catheter inserted into the femoral artery for recording of cardiovascular dynamics and activity. They were subsequently implanted with intracerebroventricular (ICV) cannulas. The acute ICV administration of beta-END significantly increased the mean arterial pressure (MAP) and heart rate (HR) compared to controls. The cardiovascular responses returned toward control levels after 2 h. In contrast, the chronic infusion of beta-END significantly decreased the MAP and HR during both the active and inactive phase. Chronic beta-END administration also decreased physical activity. Food intake was increased initially and later declined and water consumption followed a similar pattern. We conclude that in the conscious unrestrained animal the acute administration of beta-END increases MAP and HR while the chronic infusion of beta-END decreases MAP, HR, physical activity, and stimulate a short-term increase in food and water intake." @default.
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- W2076848966 date "2002-10-01" @default.
- W2076848966 modified "2023-10-17" @default.
- W2076848966 title "The effects of β -endorphin ( β -END) on cardiovascular and behavioral dynamics in conscious rats" @default.
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- W2076848966 doi "https://doi.org/10.1016/s0361-9230(02)00834-1" @default.
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