A patient with platelets deficient in glycoprotein VI that lack both collagen-induced aggregation and adhesion
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Summary
This summary is machine-generated.Platelet glycoprotein VI (GPVI) is crucial for collagen-induced aggregation. Studies show GPVI deficiency impairs platelet function, identifying it as a key collagen receptor.
Area Of Science
- Hematology
- Molecular Biology
- Immunology
Background
- Platelet aggregation is vital for hemostasis.
- Identifying platelet collagen receptors is essential for understanding bleeding disorders.
- Glycoprotein VI (GPVI) is a candidate collagen receptor.
Observation
- A patient's platelets showed impaired collagen-induced aggregation and adhesion, but normal responses to other agonists.
- Radioactive labeling revealed significantly reduced incorporation into a 61-kD glycoprotein (GPVI) in the patient's platelets.
- The patient's platelets lacked an antigen recognized by an antibody from an idiopathic thrombocytopenic purpura (ITP) patient, which targets GPVI.
Findings
- Platelets deficient in GPVI exhibit defective collagen-induced aggregation and adhesion.
- GPVI is identified as a 61-kD protein crucial for platelet response to collagen.
- The patient's platelets did not bind to types I and III collagen fibrils, supporting GPVI's role.
Implications
- GPVI functions as a primary collagen receptor on platelets.
- Understanding GPVI's role can lead to new diagnostics and therapeutics for bleeding disorders.
- Partial GPVI deficiency in parents did not impair platelet function, suggesting a threshold effect or compensatory mechanisms.