Protocol for Murine/Mouse Platelets Isolation and Their Reintroduction in vivo

Area of Science:

• Hematology
• Oncology
• Cell Biology

Background:

• Platelets and coagulation are recognized as critical factors in cancer metastasis.
• Understanding the intricate interactions between tumor cells, platelets, and the endothelium is vital for developing anti-metastatic strategies.

Purpose of the Study:

• To establish a reliable method for isolating, labeling, and reintroducing functional platelets into mice.
• To facilitate the study of platelet-tumor cell-endothelium interactions in both in vitro and in vivo models.

Main Methods:

• Adapted coagulation research techniques for platelet isolation from anti-coagulated murine blood.
• Utilized centrifugation and inhibitors of platelet activation to maintain platelet integrity.
• Employed the vital dye PKH26 for fluorescently labeling platelets, enabling microscopic observation and identification.

Main Results:

• Developed a method for isolating and reintroducing functional platelets that comprise approximately 50% of the total platelet count.
• Fluorescently labeled platelets were successfully observed and appeared to function normally post-reintroduction.
• The method allows for the study of platelet interactions with tumor cells and endothelium in murine models and tissue culture.

Conclusions:

• The described methods provide a robust approach for studying platelet function and interactions in vivo.
• This technique is valuable for investigating the role of platelets in metastasis and for exploring the effects of genetic modifications in platelets.
• The approach is adaptable for advanced imaging techniques like video microscopy.