Enhanced Fibrinolysis with Magnetically Powered Colloidal Microwheels

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Hematology

Background:

• Thrombus resolution relies on fibrinolytic agents to degrade fibrin, but delivery and penetration are limited.
• Current fibrinolysis methods face challenges in reaching and effectively dissolving blood clots.

Purpose of the Study:

• To overcome transport limitations in fibrinolysis using magnetically actuated colloidal microwheels.
• To enhance the speed and efficacy of thrombus dissolution through targeted delivery and mechanical action.

Main Methods:

• Development of colloidal microwheel assemblies functionalized with tissue-type plasminogen activator (tPA).
• Utilizing applied magnetic fields to control microwheel assembly, rotation, translation, and disassembly.
• Investigating fibrinolysis rates in plasma-derived fibrin gels and microfluidic models of platelet-rich thrombi.

Main Results:

• tPA-microwheels achieved fivefold faster fibrinolysis of fibrin gels compared to free tPA.
• Microwheels demonstrated mechanical penetration into 100 µm platelet-rich thrombi within approximately 5 minutes.
• Demonstrated a combined surface and bulk dissolution mechanism with mechanical action.

Conclusions:

• Magnetically guided microwheels offer a novel strategy for rapid and targeted fibrinolysis.
• This approach overcomes diffusion limitations, showing potential for treating occlusions in small or deep vessels.
• Microwheel technology presents a promising advancement over traditional fibrinolytic therapies.