Why does tissue rejection occur? how is this problem overcome? ?

Tissue rejection occurs when an organ is not recognized by the immune system of the body. This usually occurs in organ transplantation due to incompatibility of the donor's tissues with that of the recipient's. This tissue rejection mechanism is initiated by the Major Histocompatibility Cells of the immune system that are activated and recognize the outsider cells as foreign.

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Tissue rejection :Tissue rejection occurs when the transplanted tissue is not accepted by the body of the transplant recipient.During tissue rejection, the tissues of the transplanted organ are treated as foreign bodies by the recipient’s immune system and are attacked by phagocytes. This causes the transplanted tissue to fail.Prevention of tissue rejection:Required tissue can be transplanted from genetically-similar donors.Tissue can be transplanted from one part of the body to another, e.g. skin grafting, as the tissue will be recognised as the recipient’s own tissue.Immunosuppressive drugs can be taken to suppress the immune system of the recipient.

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