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Reduced thrombin binding and aggregation in Bernard-Soulier platelets.

G A Jamieson, T Okumura

The Journal of Clinical Investigation

|March 1, 1978

Summary

This summary is machine-generated.

Platelets from Bernard-Soulier disease patients exhibit reduced thrombin binding and aggregation, potentially explaining their bleeding issues. This study quantifies these binding differences in Bernard-Soulier platelets versus normal controls.

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Area of Science:

Hematology
Platelet Biology
Hemostasis

Background:

Bernard-Soulier disease is a rare inherited bleeding disorder.
Platelets play a crucial role in hemostasis, and their interaction with thrombin is vital.

Purpose of the Study:

To investigate thrombin binding and aggregation in platelets from Bernard-Soulier disease patients.
To compare thrombin binding characteristics between Bernard-Soulier platelets and normal controls.

Main Methods:

Thrombin binding assays were performed on platelets from two Bernard-Soulier patients and normal controls.
High and low affinity binding sites and dissociation constants (Kd) were determined.
Platelet aggregation rates induced by various thrombin concentrations were measured.

Main Results:

Bernard-Soulier platelets showed significantly fewer high-affinity (1,500 vs. 4,000 sites) and low-affinity (8,800 vs. 24,000 sites) thrombin binding sites compared to controls.
The dissociation constant (Kd) for thrombin binding was identical in both high (4.4 nM) and low (37 nM) affinity ranges for patients and controls.
Platelets from Bernard-Soulier patients exhibited a decreased rate of thrombin-induced aggregation at both optimal and suboptimal thrombin concentrations.

Conclusions:

Reduced thrombin binding and impaired thrombin-induced aggregation in Bernard-Soulier platelets may contribute to the hemostatic defect.
The findings suggest a single class of thrombin binding sites on the platelet surface with consistent affinity in both normal and Bernard-Soulier platelets.