New NO-donors with antithrombotic and vasodilating activities, Part 14. 1,3,4-Triazol-1-oles

Area of Science:

• Medicinal Chemistry
• Pharmacology
• Cardiovascular Research

Background:

• Thrombosis poses a significant health risk, necessitating the development of novel antithrombotic agents.
• Nitric oxide (NO) plays a crucial role in regulating vascular tone and platelet function.

Purpose of the Study:

• To synthesize and evaluate a series of 1,3,4-triazol-1-ole derivatives for their antithrombotic potential.
• To investigate the mechanism of action underlying the observed antithrombotic effects.

Main Methods:

• Synthesis of five 1,3,4-triazol-1-ole derivatives (5a-f) with varying substituents.
• In vivo assessment of antithrombotic activity in rats using laser-induced thrombus formation.
• Measurement of blood pressure in spontaneously hypertensive rats (SHR).
• Evaluation of platelet aggregation inhibition using the Born assay for the synthetic precursor.

Main Results:

• The 2,5-dimethyl-1,3,4-triazol-1-ole (5a) demonstrated significant antithrombotic activity, inhibiting thrombus formation by 42% in arterioles and 33% in venules at 2 hours post-administration (60 mg/kg).
• Compound 5a caused a sustained, significant 5% decrease in blood pressure in SHR rats up to 4 hours.
• The synthetic precursor, 1,1'-Azo-bis-ethanone oxime (7), inhibited platelet aggregation with an IC50 of 15 μmol/L.
• The observed pharmacological profile suggests a mechanism involving nitric oxide.

Conclusions:

• 1,3,4-triazol-1-ole derivatives, particularly the 2,5-dimethyl analog (5a), exhibit promising antithrombotic properties.
• The findings support a potential therapeutic role for these compounds in managing thrombotic disorders.
• Further research into the nitric oxide-mediated pathway is warranted to fully elucidate the mechanism of action.