Prospects for xenotransplantation.

Pig-to-primate organ survival has been extended from a few minutes to weeks and occasionally months, following the development of transgenic pigs that express human complement-regulatory proteins, efficient antibody removal technologies and immunosuppressive strategies. The current limitation to the clinical application of this technology is acute vascular rejection, and an understanding of the mechanisms of this process and the development of modalities to overcome it are key to making significant progress at solving the critical shortage of organs for transplantation. Approaches that address this issue are underway in a number of laboratories.