Aminomethylpiperazines as selective urotensin antagonists

Area of Science:

• Pharmacology
• Medicinal Chemistry

Background:

• Aminomethylpiperazines were previously identified as kappa-opioid receptor agonists.
• Urotensin receptors are implicated in physiological processes such as vasoconstriction.

Purpose of the Study:

• To develop selective urotensin receptor antagonists.
• To explore the therapeutic potential of urotensin antagonists for hypertension.

Main Methods:

• Chemical optimization of aminomethylpiperazine derivatives.
• Assays for receptor binding affinity and selectivity (urotensin vs. kappa-opioid receptors).
• In vitro testing of vasoconstriction inhibition in rat aortic rings.

Main Results:

• Optimized piperazine substitutions yielded high-affinity urotensin receptor antagonists.
• Compounds exhibited >100-fold selectivity for urotensin receptors over kappa-opioid receptors.
• Selected antagonists inhibited urotensin-induced vasoconstriction in isolated rat aortic rings.

Conclusions:

• Aminomethylpiperazine derivatives can be developed into selective urotensin receptor antagonists.
• These antagonists demonstrate potential for treating hypertension by counteracting urotensin-mediated vasoconstriction.