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Abstract
The monoamine oxidase (MAO) inhibitor pargyline induced a moderate (about 20 mm Hg) but persistent (48 h) decrease of systolic blood pressure in unanesthetized adult spontaneously hypertensive rats (SHR) but not in normotensive rats. The fall of blood pressure correlated with the blockade of norepinephrine (NE) deamination by brain homogenates. After an intracerebroventricular (icv) injection of 6-hydroxydopamine, which lowered brain NE content by about 70%, pargyline was unable to diminish arterial pressure. Blockade of central α-adrenoreceptors by the treatment with phenitolamine (100 μg icv) could either prevent or reverse the fall of blood pressure in SHR induced by pargyline. Moreover, a low dose of pargyline injected directly into the brain lowered arterial pressure. We conclude that the hypotensive action of pargyline in SHR appears to be consequence of NE accumulating at an inhibitory α-adrenoceptor in brain.
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