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      Relationship between Platelets and Neutrophil Adhesion and Neointimal Growth after Repeated Arterial Wall Injury Induced by Angioplasty in Pigs

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          Platelet and neutrophil interactions with injured vascular wall may contribute to restenosis. Their importance was mainly examined following balloon injury of intact arteries. However, dilation of diseased arteries is clinically more relevant and may elicit different responses. We investigated the relationship between platelets and neutrophil adhesion, neointima formation and P-selectin expression on damaged arteries after repeated balloon injury. In an acute single-injury model, 8 pigs were subjected to bilateral carotid angioplasty and sacrificed 1 h later. In a chronic model, 19 pigs were subjected to similar procedures and allowed to recover for 4 weeks; then 18 arteries were redilated at the same previously injured sites (double injury) while the remaining arteries were not redilated and used to investigate the extent and the adhesive properties of the neointima. After single injury, <sup>51</sup>Cr-platelet adhesion (×10<sup>6</sup>/cm<sup>2</sup>) increased significantly from 3.8 ± 0.6 to 45.9 ± 6.5 (p < 0.05) on mildly and deeply injured segments, respectively, and were statistically similar after double injury. After single injury, <sup>111</sup>In-neutrophil adhesion (×10<sup>3</sup>/cm<sup>2</sup>) increased from 226.6 ± 45.5 to 512.5 ± 70.3 (p < 0.05) on mildly and deeply injured segments, and were significantly higher (p < 0.05) after double injury (mild: 1,289.1 ± 227.9 and deep: 2,411.8 ± 333.9). As well, the neo-endothelium expresses P-selectin at 4 weeks and platelet and neutrophil adhesion was directly related to neointimal growth. These results, which indicate ongoing proinflammatory processes 1 month post-angioplasty, suggest that neutrophils may participate in the progression of restenosis.

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          Most cited references 5

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          Leukocyte accumulation promoting fibrin deposition is mediated in vivo by P-selectin on adherent platelets.

          The glycoprotein P-selectin is a cell adhesion molecule of stimulated platelets and endothelial cells, which mediates the interaction of these cells with neutrophils and monocytes. It is a membrane component of cell storage granules, and is a member of the selectin family which includes E-selectin and L-selectin. P-selectin recognizes both lineage-specific carbohydrate ligands on monocytes and neutrophils, including the Lewis x antigen, sialic acid, and a protein component. In inflammation and thrombosis, P-selectin may mediate the interaction of leukocytes with platelets bound in the region of tissue injury and with stimulated endothelium. To evaluate the role of P-selectin in platelet-leukocyte adhesion in vivo, the accumulation of leukocytes within an experimental thrombus was explored in an arteriovenous shunt model in baboons. A Dacron graft implanted within an arteriovenous shunt is thrombogenic, accumulating platelets and fibrin within its lumen. These bound platelets express P-selectin. Here we show that antibody inhibition of leukocyte binding to P-selectin expressed on platelets immobilized on the graft blocks leukocyte accumulation and inhibits the deposition of fibrin within the thrombus. These results indicate that P-selectin is an important adhesion molecule on platelets, mediating platelet-leukocyte binding in vivo, that the presence of leukocytes in thrombi is mediated by P-selectin, and that these leukocytes promote fibrin deposition.
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            A subpopulation of Mac-1 (CD11b/CD18) molecules mediates neutrophil adhesion to ICAM-1 and fibrinogen

             T Springer,  M Diamond (1993)
            We report that a subpopulation (10%) of the Mac-1 (CD1 1b/CD18) molecules on activated neutrophils mediates adhesion to ICAM-1 and fibrinogen. We describe a novel mAb (CBRM1/5) that binds to an activation-specific neoepitope on a subset of Mac-1 molecules on neutrophils and monocytes after stimulation with chemoattractants or phorobol esters but does not recognize Mac-1 on resting myeloid cells. CBRM1/5 immunoprecipitates a subpopulation of Mac-1 molecules from detergent lysates of neutrophils, binds to immunoaffinity-purified Mac- 1, and localizes to the I domain on the alpha chain of Mac-1. Because CBRM1/5 recognizes a fraction of Mac-1 on activated neutrophils, but still blocks Mac-1-dependent adhesion to fibrinogen and ICAM-1, we suggest that only a small subset of Mac-1 molecules is competent to mediate adhesion.
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              Neutrophil and platelet activation at balloon-injured coronary artery plaque in patients undergoing angioplasty.

              This study sought to investigate changes in the expression of activation-dependent adhesion receptors on neutrophils and platelets after exposure to the balloon-injured coronary artery plaque. Activation of blood cells at the balloon-injured coronary artery plaque may contribute to abrupt vessel closure and late restenosis after percutaneous transluminal coronary angioplasty. In 30 patients undergoing elective coronary angioplasty, blood specimens were obtained through the balloon catheter proximal to the plaque before dilation and distal to the plaque after dilation. Simultaneous blood samples obtained through the guiding catheter served as control samples. Total surface expression of the inducible fibrinogen receptor (CD41) and surface expression of the activated fibrinogen receptor (LIBS1) on platelets as well as Mac-1 (CD11b) and L-selectin (CD62L) surface expression on neutrophils were assessed by flow cytometry. After exposure to the dilated coronary artery plaque, surface expression of LIBS1 on platelets increased by 40.5 +/- 11.0 mean (+/-SE) fluorescence (p=0.001) and that of CD11b on neutrophils increased by 20.1 +/- 4.4 mean fluorescence (p=0.018). Concomitantly, anti-CD62L binding on neutrophils decreased by 6.6 +/- 2.4 mean fluorescence (p=0.022). In contrast, surface expression of the adhesion receptors did not change significantly between the coronary ostium and the prestenotic coronary segment. The results of this study demonstrate neutrophil and platelet activation at the balloon-injured coronary artery plaque. This cellular activation may serve as a target for pharmacologic interventions to improve the outcome of coronary angioplasty.

                Author and article information

                J Vasc Res
                Journal of Vascular Research
                S. Karger AG
                April 2001
                13 April 2001
                : 38
                : 2
                : 153-162
                aLaboratory of Experimental Pathology and bExperimental Interventional Laboratory, Montreal Heart Institute, University of Montreal, Q.C., Canada
                51042 J Vasc Res 2001;38:153–162
                © 2001 S. Karger AG, Basel

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                Page count
                Figures: 6, Tables: 3, References: 51, Pages: 10
                Research Paper


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