Pig Heart Grafted to Humans: World First
- A genetically modified pig liver has functioned normally for 10 days in a human patient, showing no signs of rejection, according to a new study.
- A modified pig liver transplanted into a brain-dead patient maintained stable blood flow and performed basic metabolic functions for 10 days, according to researchers.
- The team of doctors, including Kai-Shan Tao, Zhao-Xu Yang, Xuan Zhang, and Hong-Tao Zhang from Fourth Military Medical University in China, monitored the liver's function in a patient...
Gene-Edited Pig Liver Functions in human for 10 Days
Table of Contents
- Gene-Edited Pig Liver Functions in human for 10 Days
- Gene-Edited Pig Liver: A Breakthrough in Xenotransplantation
- What is xenotransplantation?
- What are the Recent Advances in Xenotransplantation?
- How is a Pig liver Modified for human Transplantation?
- How Long Did the Pig Liver Function in the Human Patient?
- What Functions Did the Transplanted Pig Liver Perform?
- What are the Benefits of Xenotransplantation?
- Why are pig Livers Used for Xenotransplantation?
- Are There Any Risks Associated with Pig Liver Transplants?
- What Are the Next Steps in Xenotransplantation Research?
- What are the Potential Implications of this Study?
- Previous Xenotransplantation Trials
- Summary Table
A genetically modified pig liver has functioned normally for 10 days in a human patient, showing no signs of rejection, according to a new study.
A modified pig liver transplanted into a brain-dead patient maintained stable blood flow and performed basic metabolic functions for 10 days, according to researchers. The patient’s original liver was not removed,allowing scientists to test the pig liver’s ability to supplement a failing liver while awaiting a transplant.
The team of doctors, including Kai-Shan Tao, Zhao-Xu Yang, Xuan Zhang, and Hong-Tao Zhang from Fourth Military Medical University in China, monitored the liver’s function in a patient diagnosed with brain death.
The study offers potential hope for patients with advanced liver disease who require transplants.Globally, there were more than 41,000 liver transplants in 2023.
This is an meaningful experiment, wich opens a different way for what has been tried so far in vital organs (heart) and non-vital organs (kidneys), such as temporary replacements of the heart that the human lives can be obtained for definitive transplants.
Rafael Matesz, Nephrology, National Transplant Organization in Spain
The limited availability of donor organs remains a significant obstacle for transplant patients. Xenotransplantation, the transplantation of animal organs into humans, offers a possible solution, acting as a bridge until suitable human donors become available.
Previous clinical trials involving xenotransplantation have shown promise. In 2023,a genetically modified pig liver was installed externally in a brain-dead patient for 3 days. Experiments involving genetically modified pig kidneys have also reported normal function after transplantation into brain-dead patients.
Liver transplants are more complex than kidney transplants due to the liver’s intricate functions. Some scientists have expressed concern that fats, proteins, and glucose produced by pig livers could trigger strong immune responses in humans.
The recent transplant involved six genetic modifications designed to minimize immune rejection, including the removal of genes that mediate hyperacute rejection and the insertion of human genes to enhance compatibility.
The transplanted pig liver was placed in the patient’s abdominal cavity and connected for monitoring, supplementing the original liver. The study was halted after 10 days at the family’s request, but the pig liver continued to function until the end. Immunosuppressants were used to prevent rejection.
The transplanted liver maintained good blood flow and produced bile and albumin,indicating proper function.
Further research is needed to determine if a pig liver can adequately function in patients experiencing liver failure, as the patient in this study retained some liver function.
The study suggests that genetic modification can prevent hyperacute rejection and low platelet counts associated with xenotransplantation, making it a viable area for further investigation.
This study is a milestone in the liver xenotransplantation, because for the frist time explaining the transplant of the liver of pigs that are genetically modified to humans (in this case, humans whose brain is dead).
iván Fernández Vega, Neurologist, Oviedo University
Vega added that the scientific accuracy, clinical characterization, immunology, histology, and hemodynamics of the procedures were comprehensive.
Further studies are needed with more patients to generalize the results. This research, published in *Nature*, represents a promising step toward providing a potential rescue for patients with liver failure awaiting human transplants.
Gene-Edited Pig Liver: A Breakthrough in Xenotransplantation
What is xenotransplantation?
Xenotransplantation refers to the transplantation of organs or tissues from animals into humans. With the shortage of human donor organs, xenotransplantation offers a possible solution, acting as a bridge until suitable human donors become available.
What are the Recent Advances in Xenotransplantation?
A recent study published in Nature highlights a notable advancement in xenotransplantation. Researchers successfully transplanted a genetically modified pig liver into a brain-dead human patient. This modified pig liver maintained stable blood flow and performed basic metabolic functions for 10 days, showing no signs of rejection.
How is a Pig liver Modified for human Transplantation?
The recent transplant involved six genetic modifications, which were designed to minimize immune rejection.These modifications include:
Removal of Genes: Genes were removed that mediate hyperacute rejection.
Insertion of Human genes: Human genes were inserted to enhance compatibility.
How Long Did the Pig Liver Function in the Human Patient?
The pig liver functioned normally for 10 days in the human patient.
What Functions Did the Transplanted Pig Liver Perform?
The transplanted pig liver maintained good blood flow and produced bile and albumin, indicating proper function.
What are the Benefits of Xenotransplantation?
The main benefit of xenotransplantation is addressing the critical shortage of donor organs. This could perhaps save the lives of patients with advanced liver disease waiting for transplants.
Why are pig Livers Used for Xenotransplantation?
Pigs are often chosen for xenotransplantation due to their:
Availability
physiological similarities to humans
Are There Any Risks Associated with Pig Liver Transplants?
some scientists have expressed concern that fats, proteins, and glucose produced by pig livers could trigger strong immune responses in humans.Though, genetic modifications are designed to minimize these risks, such as the modifications in the recent study.
What Are the Next Steps in Xenotransplantation Research?
Further research is needed to determine if a pig liver can adequately function in patients experiencing liver failure, as the patient in this study retained some liver function. Additionally,studies with more patients are needed to generalize the results.
What are the Potential Implications of this Study?
This research represents a promising step toward providing a potential rescue for patients with liver failure awaiting human transplants. As Rafael Matesz, from the National Transplant Association in Spain, stated, “This is a meaningful experiment, which opens a different way for what has been tried so far in vital organs (heart) and non-vital organs (kidneys), such as temporary replacements of the heart that the human lives can be obtained for definitive transplants.”
Previous Xenotransplantation Trials
Previous clinical trials involving xenotransplantation have shown promise:
2023: A genetically modified pig liver was installed externally in a brain-dead patient for 3 days.
Other experiments: Experiments involving genetically modified pig kidneys have also reported normal function after transplantation into brain-dead patients.
Summary Table
| Feature | Details |
| :—————————————- | :——————————————————————————————————– |
| organ | Pig Liver |
| Patient | Brain-dead Human |
| Duration of Function | 10 days |
| Genetic Modifications | Six modifications to minimize rejection |
| Observed Function | Maintained blood flow, produced bile and albumin |
| Goal | Address liver donor shortage and serve as a bridge for patients needing transplants |
| Importance | Promising step toward a potential rescue for patients with liver failure, as stated by iván fernández Vega |