Xenotransplantation: Transplantable Transgenic Animal
Organs
An innovative use of transgenics for the production of useful proteins
is the generation of clinically transplantable transgenic animal organs. The
success of human-to-human transplantation of heart, kidney, liver, and other
vascularized organs (allotransplan-tation) created the significant expectation
and need for donor organs. Primate-to-human transplantation
(xenotransplantation was successful, but ethical issues and limited number of
donor animals were significant barriers. Transplant surgeons recognized early
on that organs from the pig were a rational choice for xenotransplantation (due
to physiological, anatomical, ethical, and supply reasons) if the serious
hyperacute rejection could be overcome. Several research groups in academia and
industry have pioneered the transgenic engineering of pigs expressing both
human complement inhibitory proteins as well as key human blood group proteins
(antigens) (Makowka, 1993; Fodor et al., 1994; McCurry et al., 1995; Saadi and
Platt, 1997; Dunn et al., 2005). Cloning has now produced transgenic pigs for
xenotransplantation. Cells, tissues and organs from these double transgenic
animals appear to be very resistant to the humoral immune system mediated
reactions of both primates and likely humans. These findings begin to pave the
way for potential xenograft transplantation of animalcomponents into humans
with a lessened chance of acute rejection.
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