Abstract
Class II major histocompatibility complex (MHC) antigen induction was investigated on enterocytes of heterotopic rat small bowel allografts in the Lewis-Brown Norway strain combination and on isografts in the Lewis-Lewis strain combination. I a antigens were detected with monoclonal antibodies using an immunoperoxidase technique. Generally, MHC class II antigens were not exhibited in the isografted group, with the exception of two long-term isografts that presented the same pattern as normal small bowel. In these cases, I a was expressed in a patchy distribution predominantly in the villi, and only very few enterocytes stained positive in Lieberkühn's crypts. Allografted rats showed a typical pattern of I a expression on the enterocytes during the rejection course. The initial expression was confined to the crypts, indicating a very early stage of rejection when compared to histological findings. More advanced stages of rejection were accompanied by increasing I a biosynthesis in the crypts and I a expression by the epithelium lining the villi. Cyclosporin (CyA) was not able to fully inhibit MHC class II antigen expression; however, the appearance of I a was delayed.
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Schmid, T., Oberhuber, G., Körözsi, G. et al. Altered distribution of MHC class II antigens on enterocytes during acute small bowel allograft rejection in rats. Transplant Int 3, 73–77 (1990). https://doi.org/10.1007/BF00336207
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DOI: https://doi.org/10.1007/BF00336207