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T. Kawai, A. Cosimi, R. Colvin, J. Powelson, James Eason, Tomacsz Kozlowski, M. Sykes, R. Monroy, Mayumi Tanaka, D. Sachs (1995)
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L. Bühler, M. Basker, I. Alwayn, C. Goepfert, H. Kitamura, T. Kawai, S. Gojo, T. Kozłowski, F. Ierino, M. Awwad, D. Sachs, R. Sackstein, S. Robson, D. Cooper (2000)
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D. Ko, A. Bartholomew, A. Poncelet, D. Sachs, Christene Huang, A. Leguern, Kakkudiyil Abraham, R. Colvin, S. Boskovic, H. Hong, S. Wee, H. Winn, A. Cosimi (1998)
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The infusion of large numbers of porcine cells into primates in order to induce specific immunologic tolerance by mixed hematopoietic chimerism, results in thrombotic microangiopathy that can be fatal. For this reason, it is important to study in vitro the interaction of primate endothelial cells with pig cells. We show that pig peripheral blood mononuclear cells (p‐PBMC) activate human endothelial cells (hECs) through direct contact. Thus, when endothelial cells are cultured in the presence of p‐PBMC, overexpression of VCAM‐1 and E‐selectin adhesion molecules occurs within 3 h of culture and continues for at least 9 h. The co‐culture of p‐PBMC and hECs also results in an important adhesion of human platelets to both types of cell. Thus, viewed with the microscope, platelets aggregate above the endothelial cells and also around the pig cells. We present data that suggest that the presence of p‐PBMC may be more important with regard to the increase of platelet adhesion to the endothelial cells than the activation alone of the cells. Our results also show that p‐PBMC, and not the activated endothelia or the culture supernatant of activated hECs, are able to activate the coagulation cascade because they are able to generate thrombin when added to defibrinated human plasma. Overall, these findings suggest that p‐PBMC are of primary importance for the development of the thrombotic disorders that occur in primates transplanted with pig progenitor cells.
Xenotransplantation – Wiley
Published: May 1, 2002
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