Effects of Welsh onion extracts on human platelet function in vitro

Area of Science:

• Biochemistry
• Pharmacology
• Food Science

Background:

• Welsh onion is traditionally used for cardiovascular health.
• The specific mechanisms behind its cardioprotective effects are not well understood.
• Platelet function is crucial in cardiovascular disorders.

Purpose of the Study:

• To investigate the impact of Welsh onion extracts on human platelet functions, including adhesion, aggregation, and thromboxane release.
• To elucidate the underlying mechanisms by measuring intracellular calcium ([Ca2+]i) and cyclic nucleotide levels in platelets.
• To differentiate the effects of raw versus boiled Welsh onion extracts.

Main Methods:

• Preparation of raw and boiled Welsh onion extracts.
• Assay of human platelet adhesion and adenosine diphosphate (ADP)-evoked aggregation.
• Measurement of platelet thromboxane production, intracellular calcium ([Ca2+]i) levels, and cyclic adenosine monophosphate (cAMP) levels.
• Microscopic observation of platelet morphology.

Main Results:

• Raw extracts inhibited platelet adhesion and ADP-evoked aggregation, suppressed [Ca2+]i elevation and thromboxane production, and increased cAMP levels.
• Boiled extracts induced platelet aggregation dose-dependently, enhanced adhesion and aggregation, increased [Ca2+]i and thromboxane production, and caused morphological changes.
• Boiled extracts did not affect cAMP levels.

Conclusions:

• Raw Welsh onion extracts exhibit anti-platelet activity in vitro, suggesting a potential mechanism for cardiovascular protection.
• Boiled Welsh onion extracts demonstrate pro-platelet activity, potentially increasing thrombotic risk.
• The contrasting effects depend on the preparation method (raw vs. boiled) and influence platelet signaling pathways.