Influence of Platelet Collagen Receptor Polymorphisms on Risk for Arterial Thrombosis

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Abstract
Context.—Collagens are major components of the vascular subendothelium, and the interaction of platelets with collagens initiates normal hemostasis or pathologic arteriothrombosis. Genetic factors that affect the interaction of platelets with collagens could represent risk factors for either arteriothrombosis or excessive hemorrhage. In this regard, we first found that platelet levels of one of the major platelet collagen receptors, integrin α2β1, vary up to 10-fold in normal healthy individuals and that the higher-level phenotype is associated with allele 1 (807T) of the integrin α2 gene. More recently, we found that there is roughly a fivefold range in platelet glycoprotein VI content among normal individuals, which may also influence risk for thromboembolism. Objective.—To determine if genetic polymorphisms of platelet glycoproteins involved in collagen-related function are associated with higher risk for thrombotic disorders, such as coronary heart disease, myocardial infarction, or stroke. Methods.—We examined the genetic mechanisms responsible for variation in expression levels of the collagen receptor integrin α2β1 and the potential influence of this variation on risk for thrombotic diseases. Results.—We found that patients with arteriothrombotic diseases have a higher frequency of α2 allele 1 (associated with higher levels of platelet integrin α2β1). We further found that platelet glycoprotein VI content directly correlates with platelet prothrombinase activity, suggesting that a higher phenotype of platelet glycoprotein VI also may contribute to increased risk of arteriothrombotic diseases. Conclusion.—Genetic polymorphisms that influence the level or function of platelet collagen receptors need to be seriously considered as genetic risk factors for arteriothrombotic diseases.

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