Clopidogrel Improves Skin Microcirculatory Endothelial Function in Persons With Heightened Platelet Aggregation.

Area of Science:

• Cardiovascular Science
• Pharmacology
• Microcirculation Research

Background:

• Platelet activation contributes to oxidative stress, inflammation, and endothelial dysfunction.
• Assessing platelet inhibition's impact on endothelial function is crucial for understanding vascular health.
• Clopidogrel's potential to enhance endothelial function via platelet attenuation was investigated.

Purpose of the Study:

• To quantify the effects of clopidogrel on endothelial function in healthy individuals.
• To evaluate if clopidogrel attenuates platelet activity and improves microcirculatory endothelial function.
• To explore sex-based differences in clopidogrel's effects on endothelial function.

Main Methods:

• Microcirculatory endothelial function assessed using laser Doppler flowmetry (LDF) with thermal hyperemia (TH).
• Platelet aggregation and LDF measured at baseline and after 7 days of clopidogrel administration.
• Study included 287 participants from the Old Order Amish community, with analysis of TH-LDF and postocclusive reactive hyperemia.

Main Results:

• Clopidogrel administration significantly increased TH-LDF measures in participants with high baseline platelet aggregation.
• The percentage change in TH-LDF was approximately twofold higher in those with high versus low platelet aggregation.
• Clopidogrel's positive effect on TH-LDF was more pronounced in women.

Conclusions:

• Clopidogrel administration improves TH-induced microcirculatory endothelial function in healthy individuals with high platelet aggregation.
• These findings suggest clopidogrel may offer additional vascular benefits through its antiplatelet activity.
• The study highlights a potential therapeutic role for clopidogrel in enhancing microcirculatory endothelial function.