Cardiovascular activity of aromatic guanidine compounds

Area of Science:

• Pharmacology
• Medicinal Chemistry
• Cardiovascular Science

Background:

• Aromatic guanidines and phenylbiguanides are classes of compounds with potential biological activity.
• Understanding their cardiovascular effects is crucial for developing new therapeutic agents.

Purpose of the Study:

• To synthesize and evaluate the cardiovascular (CV) effects of aromatic guanidines and 1-phenylbiguanides.
• To explore structure-activity relationships (SAR) and preliminary mechanisms of action.

Main Methods:

• Cardiovascular parameters (heart rate, blood pressure, carotid artery blood flow, myocardial force) were measured in anesthetized dogs.
• Synthesis of aromatic guanidines and 1-phenylbiguanides.
• Structure-activity relationship analysis and preliminary mechanism studies.

Main Results:

• The predominant CV effect observed was vasoconstriction, independent of cardiac stimulation.
• Phenylguanidines with hydroxy or chloro substituents at the 3 and 4 positions were the most potent.
• Preliminary studies suggested a direct alpha-adrenergic mechanism for 3,4-dihydroxyphenylguanidines.

Conclusions:

• Aromatic guanidines and phenylbiguanides exhibit significant cardiovascular effects, primarily vasoconstriction.
• Specific structural features, such as 3,4-disubstitution on the phenyl ring, enhance potency.
• The alpha-adrenergic system is implicated in the mechanism of action for some of these compounds.