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  • Title: Beta(3)-integrin-deficient mice but not P-selectin-deficient mice develop intimal hyperplasia after vascular injury: correlation with leukocyte recruitment to adherent platelets 1 hour after injury.
    Author: Smyth SS, Reis ED, Zhang W, Fallon JT, Gordon RE, Coller BS.
    Journal: Circulation; 2001 May 22; 103(20):2501-7. PubMed ID: 11369692.
    Abstract:
    BACKGROUND: Intimal hyperplasia contributes to restenosis after percutaneous vascular interventions. Both beta(3)-integrins, alpha(V)beta(3) and alpha(IIb)beta(3) (glycoprotein IIb/IIIa), and leukocytes have been implicated in neointimal formation, based in part on the results obtained using antagonists to 1 or both receptors in animal models. METHODS AND RESULTS: The responses in wild-type mice, beta(3)-integrin-deficient mice, and P-selectin-deficient mice were studied in a model of transluminal endothelial injury of the femoral artery. At 4 weeks, beta(3)-integrin-deficient mice were not protected from developing intimal hyperplasia, whereas P-selectin-deficient mice were protected. Within 1 hour of injury, several layers of platelets deposited on the arteries of wild-type mice and a single layer of platelets deposited on the vessels of beta(3)-integrin-deficient mice; in both cases, leukocytes were recruited to the platelet layer. In P-selectin-deficient mice, the platelet layer was less compact and extended further into the lumen but did not recruit leukocytes. CONCLUSIONS: In a model of transluminal arterial injury, absence of early leukocyte recruitment and not deficiency of beta(3)-integrins correlated with a reduction in neointimal formation. Blockade of P-selectins may be an effective therapeutic strategy to decrease restenosis after percutaneous vascular interventions.
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