Preservation, reperfusion, and rejection in transgenic xenograft organs

The success of transplantation has resulted in increasing demand, despite a continuing fall, in donor organ supply. This widening gap encourages the a rgument for animals to act as a reservoir for donor organs (xenografts). De spite genetic manipulation, transgenic xenograft organs are at risk of vasc ular rejection in man (delayed xenograft rejection), a process in part invo lving endothelial cell activation. It appears that ischemia-reperfusion inj ury also involves endothelial cell activation. Evidence already exists to s upport the suggestion that ischemia-reperfusion injury may promote delayed xenograft rejection. The mechanisms of both these processes are briefly des cribed and a case is made for optimum organ preservation of transgenic xeno graft donor organs before clinical work is proposed.