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Thrombin-induced platelet aggregation is mediated by a platelet plasma membrane-bound lectin
Science (New York, N.Y.)
|June 16, 1978
Summary
Stimulated human platelets exhibit lectin activity, causing red blood cell agglutination. This platelet lectin activity, crucial for aggregation, is inhibited by specific amino sugars and amino acids.
Area of Science:
- Hematology
- Biochemistry
- Cell Biology
Background:
- Platelets play a critical role in hemostasis and thrombosis.
- Thrombin is a key activator of platelets, leading to aggregation.
- The precise molecular mechanisms of platelet aggregation are still under investigation.
Purpose of the Study:
- To investigate the lectin-like activity of thrombin-activated human platelets.
- To identify molecules involved in thrombin-induced platelet aggregation.
- To elucidate the role of cell surface components in platelet aggregation.
Main Methods:
- Utilized trypsinized and formalinized bovine erythrocytes as target cells.
- Assessed platelet agglutination induced by thrombin-activated human platelets.
- Investigated the inhibitory effects of various sugars and amino acids on platelet lectin activity and aggregation.
Main Results:
- Thrombin-activated human platelets demonstrated agglutination of treated erythrocytes, indicating lectin activity.
- This lectin activity was specifically inhibited by galactosamine, glucosamine, mannosamine, lysine, and arginine.
- Inhibitors of the lectin activity also effectively blocked thrombin-induced platelet aggregation.
Conclusions:
- Human platelets possess a membrane-associated lectin activity upon thrombin activation.
- Specific amino sugars and amino acids are involved in mediating this lectin activity.
- This lectin activity appears to be a key mechanism driving thrombin-induced platelet aggregation.