Tissue transplantation allograft immunity

After tissue transplantation, the severity and the period of rejection depend on the tissue type, and this process involves the specificity and memory components of the immune response. Avrion Mitchison in the 1950s observed that allograft immunity could be transferred by the components of the cellular immune response, and antibodies present in the serum that were part of the humoral response were not associated with this process. Future studies delineated the role of T lymphocytes in the allograft rejection process, and the role of both CD4+ and CD8+ cells was established. 

Allograft Tissue or organ transplanted from a donor of the same species but different genetic makeup the recipient s immune system must be suppressed to prevent rejection of the allograft (graft). 

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