Preparation of thrombomodulin from human placenta

Area of Science:

• Biochemistry
• Hematology
• Cell Biology

Background:

• Thrombomodulin is a crucial cell surface protein.
• It acts as a cofactor for thrombin, facilitating protein C activation.
• Understanding thrombomodulin's properties is key to blood coagulation research.

Purpose of the Study:

• To isolate and characterize human thrombomodulin from placental tissue.
• To determine its molecular weight, solubility, and stability.
• To confirm its cofactor activity in protein C activation.

Main Methods:

• Affinity chromatography and gel filtration for thrombomodulin isolation.
• Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for molecular weight determination.
• Assays to assess cofactor activity and stability under various conditions.

Main Results:

• Human thrombomodulin was successfully isolated from placenta.
• Purified thrombomodulin has a molecular weight of 88,000 Da and an isoelectric point around pH 4.
• It is soluble in detergent, inactivated by disulfide bond reduction, but stable to heat and pH extremes.
• Thrombomodulin demonstrated cofactor activity for thrombin-catalyzed protein C activation in both human and bovine systems.

Conclusions:

• Human thrombomodulin is a stable cofactor protein with specific biochemical properties.
• Its role in protein C activation is conserved across species.
• The findings provide a basis for further investigation into thrombomodulin's function in hemostasis.