Phloretin suppresses thrombin-mediated leukocyte-platelet-endothelial interactions

Area of Science:

• Biochemistry
• Cardiovascular Biology
• Pharmacology

Background:

• Thrombin is a key pro-inflammatory mediator in the coagulation cascade, potentially driving atherosclerosis.
• Phloretin, a natural compound from apple tree leaves, is investigated for its anti-thrombotic and anti-atherosclerotic properties.

Purpose of the Study:

• To determine if phloretin can disrupt the link between thrombin-mediated thrombosis and atherosclerosis.
• To elucidate the molecular mechanisms by which phloretin exerts its effects.

Main Methods:

• Human endothelial cells were treated with phloretin and stimulated with thrombin.
• Assessed the adhesion of monocytes and platelets to endothelial cells.
• Measured the expression of key inflammatory markers like PAR-1, CD40, CD40L, MCP-1, IL-6, IL-8, COX-2, PGE2, PAI-1, tissue factor, and connective tissue growth factor.

Main Results:

• Phloretin significantly attenuated monocyte and platelet adhesion to thrombin-activated endothelial cells.
• Inhibited thrombin-induced expression of PAR-1, CD40, CD40L, integrin β3, P-selectin, MCP-1, IL-6, IL-8, COX-2, PGE2, PAI-1, and tissue factor.
• Phloretin reversed thrombin-induced expression of endothelial connective tissue growth factor.

Conclusions:

• Phloretin effectively inhibits thrombin-induced thrombosis by preventing monocyte and platelet adhesion.
• Phloretin demonstrates potential as a therapeutic agent for preventing thrombosis and atherosclerosis.