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Cardiovascular profile of 5-methyl-2-phenyl-4-imidazole-acetonitrile (MCN-2378), a cerebral vasodilator
Abstract:
I.v. administration of McN-2378 appeared to preferentially increase cerebral blood flow as opposed to systemic (femoral) blood flow in two strains of monkeys. This cerebral vasodilation was not affected by theta-adrenergic blockade. In the anesthetized dog, the compound transiently lowered systemic arterial pressure with an associated transient decrease in femoral vascular resistance and increased heart rate. Cardiac output in the anesthetized dog was also transiently elevated. Although the compound contains a nitrile group, there is no evidence to suggest that cyanide release is mediating the cerebral vasodilation.
Insights
McN-2378 preferentially increases cerebral blood flow in monkeys, independent of theta-adrenergic blockade. In dogs, it caused transient hypotension and increased cardiac output, without evidence of cyanide release.
Area of Science:
- Pharmacology
- Neuroscience
- Cardiovascular Physiology
Background:
- Cerebral blood flow regulation is crucial for brain function.
- Understanding novel vasodilators is important for treating cerebrovascular disorders.
- McN-2378 is a compound with potential vasodilatory properties.
Purpose of the Study:
- To investigate the effects of McN-2378 on cerebral and systemic blood flow.
- To determine the influence of theta-adrenergic blockade on McN-2378's cerebral effects.
- To assess the cardiovascular effects of McN-2378 in an anesthetized model.
Main Methods:
- Intravenous administration of McN-2378 in two strains of monkeys.
- Measurement of cerebral and femoral blood flow.
- Administration of theta-adrenergic blockade in monkeys.
- Assessment of systemic arterial pressure, femoral vascular resistance, heart rate, and cardiac output in anesthetized dogs.
Main Results:
- McN-2378 preferentially increased cerebral blood flow over femoral blood flow in monkeys.
- Cerebral vasodilation induced by McN-2378 was unaffected by theta-adrenergic blockade.
- In dogs, McN-2378 caused transient hypotension, decreased femoral vascular resistance, and increased heart rate and cardiac output.
- No evidence suggested cyanide release mediated the cerebral vasodilation.
Conclusions:
- McN-2378 demonstrates selective cerebral vasodilation.
- The mechanism of cerebral vasodilation is not mediated by theta-adrenergic pathways.
- McN-2378 exhibits transient cardiovascular effects in dogs, with no indication of cyanide toxicity.