Intense light as anticoagulant therapy in humans

Area of Science:

• Cardiovascular Biology
• Hematology
• Chronobiology

Background:

• Blood coagulation is critical in myocardial ischemia and reperfusion (IR) injury.
• Conflicting data exist regarding the role of Period 2 (PER2) in IR injury and clotting.
• Platelet-specific PER2 function in coagulation and IR injury requires clarification.

Purpose of the Study:

• To investigate the role of platelet-specific PER2 in blood coagulation.
• To determine the impact of platelet-specific PER2 on myocardial IR injury.
• To assess the translational potential of intense light therapy in modulating coagulation.

Main Methods:

• Generated mice with tissue-specific deletion of Per2 in megakaryocytes (Per2loxP/loxP-PF4-CRE).
• Assessed platelet aggregation and clotting times in knockout and control mice.
• Evaluated myocardial infarct size and plasma troponin levels.
• Conducted translational studies using intense light therapy in healthy human subjects to assess effects on coagulation.

Main Results:

• Platelets from Per2loxP/loxP-PF4-CRE mice exhibited significantly faster clotting.
• Per2-deficient mice showed increased infarct sizes and plasma troponin levels.
• Intense light therapy repressed procoagulant pathways and reduced clot rate in human plasma samples.

Conclusions:

• Platelet-specific PER2 deficiency accelerates blood clotting.
• Intense light-induced PER2 inhibits platelet aggregation.
• Intense light therapy shows promise as a novel clinical approach for managing clotting disorders.