Present Advances and Emerging Challenges in Kidney Xenotransplantation

Area of Science:

• Transplantation immunology
• Genetic engineering
• Veterinary medicine

Background:

• The critical shortage of human organs for transplantation necessitates alternative solutions.
• Xenotransplantation, using animal organs in humans, is a potential strategy.
• Pigs are favored donors due to physiological similarities and rapid breeding.

Purpose of the Study:

• To explore the potential of genetically modified pig kidneys for human transplantation.
• To address barriers of immune rejection and zoonotic disease transmission in xenotransplantation.
• To evaluate the feasibility of pig kidney function in human recipients.

Main Methods:

• Utilizing gene editing technologies like CRISPR to modify pig genomes.
• Developing pigs that express human-compatible molecules and lack specific xenogeneic antigens (e.g., Galα1-3Gal).
• Conducting preclinical studies in non-human primates and with deceased human donors.

Main Results:

• Genetically modified pigs demonstrate reduced hyperacute and acute rejection markers.
• Short-term function of pig kidneys in human recipients has been observed in preclinical settings.
• Significant challenges remain, including long-term survival uncertainty and zoonotic disease concerns.

Conclusions:

• Genetically modified pig kidneys represent a promising avenue for addressing organ shortages.
• Further research is crucial to overcome immunological barriers, ensure long-term efficacy, and guarantee safety.
• Ethical considerations and robust pathogen surveillance are essential for advancing xenotransplantation.