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- W2063044743 abstract "Abstract: To explore the mechanism of rejection of vascularized xenografts, we performed discordant and concordant transplantation of aortic grafts. Forty-one guinea pig-to-rat and 50 hamster-to-rat aortic transplantations were performed successfully. Recipient rats were either untreated or treated three times per week with 10 mg/kg of cyclosporine (CsA) starting the day before transplantation. Recipients were sacrificed at various timepoints after transplantation and the grafts were processed for histology and immunohistochemistry. Guinea pig aortic grafts were rejected hyperacutely in both the control and CsA treated group. Four hours after transplantation all endothelial cells and some of the medial smooth muscle cells had disappeared. Seven days after transplantation the media were totally acellular, whereas the adventitia was enlarged due to infiltrating cells, consisting mainly of macrophages. At day 56, only traces of the original graft could be identified. Hamster aortic grafts developed signs of chronic rejection. In control rats, the intimal lesions could already be demonstrated in 17% of the rats at day 14, and in all rats from day 28. CsA treatment inhibited the development of the intimal lesions. At days 56 and 84 the difference in intimal thickness between the control group and the CsA treated group was statistically significant. The cellularity of the media of the hamster grafts remained constant during the first 21 days in both groups but declined sharply thereafter as a consequence of migration or necrosis of myocytes. The thickness of the adventitia in both groups increased after transplantation, due to infiltrating macrophages and T cells, reaching a peak at day 14. In conclusion, the aorta transplantation model provides useful information with regard to the development of chronic rejection in concordant grafts. Discordant aortic grafts are rejected hyperacutely just like discordant heart grafts." @default.
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- W2063044743 date "1996-08-01" @default.
- W2063044743 modified "2023-09-24" @default.
- W2063044743 title "Aorta transplantation as a model to study hyperacute, acute, and chronic rejection of xenografts" @default.
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- W2063044743 doi "https://doi.org/10.1111/j.1399-3089.1996.tb00142.x" @default.
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