Abstract
Injection of prostaglandin F2 alpha (1 nmol/rat) into the paraventricular, dorsomedial and posterior hypothalamic nuclei of halothane anesthetized rats elicited rapid increases of heart rate and blood pressure. The injection of this same dose of prostaglandin F2 alpha into the cerebroventricular system or intravenously had no effect on these parameters. The cardiovascular responses observed following prostaglandin F2 alpha injection into these hypothalamic nuclei were accompanied by increases in plasma levels of norepinephrine and epinephrine, with peak levels at the maximal cardiovascular response. This study suggests a possible role for prostaglandin F2 alpha in modulation of the cardiovascular system via specific hypothalamic nuclei.
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