Effect of dextran on platelet activation by polymerizing fibrin

Area of Science:

• Biochemistry
• Hematology
• Biomaterials Science

Background:

• Dextran is known to modify fibrin's mechanical properties and susceptibility to lysis.
• The influence of dextran on fibrin's interaction with platelets remains less understood.

Purpose of the Study:

• To investigate the effect of dextran on the platelet-activating capacity of polymerizing fibrin.
• To determine if dextran alters fibrin-induced platelet aggregation, serotonin release, and adhesion.

Main Methods:

• Incubation of human fibrinogen with thrombin or reptilase, with and without dextran.
• Assessment of fibrin polymerization rates.
• Platelet aggregation assays using washed human platelets.
• Measurement of serotonin release from platelets.
• Scanning electron microscopy for platelet adhesion analysis.
• Evaluation of fibrin clot lysis facilitated by urokinase.

Main Results:

• Dextran significantly accelerated fibrin fibril formation.
• Fibrin polymerized in the presence of dextran showed reduced potency in causing platelet aggregation and serotonin release.
• Scanning electron microscopy revealed decreased platelet adhesion to dextran-modified fibrin.
• Dextran inclusion facilitated the lysis of fibrin clots by urokinase.

Conclusions:

• Dextran alters the platelet-activating properties of polymerizing fibrin, leading to diminished platelet aggregation and adhesion.
• Dextran enhances fibrinolysis, making clots more susceptible to lysis.
• These findings suggest dextran influences critical aspects of hemostasis involving fibrin and platelets.