Porcine Tissue Uses in Xenotransplantation

What is Xenotransplantation?

In 2021, doctors in the United States performed over 40,000 organ transplants, but over 100,000 patients remain on a national waiting list because of organ shortages. Thousands more never add their name to the waiting list, considering the likelihood of receiving a transplant to be too low. The kidney waiting list is especially long, with over 90,000 patients waiting for life-saving kidney transplant surgery. Unfortunately, with many organ transplant waiting lists, the demand is greater than the supply and patients are left waiting. 

Xenotransplantation — the process of transplanting animal organs, tissues, or cells into human patients – is emerging as a solution to organ shortages. Porcine organs are a common choice for xenotransplantation studies, as they have already been used in many other medical applications (such as pharmaceutical development, skin grafts, medical research, and more). Porcine tissue is one of the closest matches to human tissue, making porcine xenotransplantation an easier goal to achieve than other xenotransplantation options. In this article, we’ll explore the history of xenotransplantation and where research is now. This is an emerging field, with new advancements every year. There is great hope that porcine xenotransplanation will save thousands — if not tens of thousands — of lives in the coming years.

History of Xenotransplantation

Even before medical researchers stepped into xenotransplantation, ancient mythology has included human and beast hybrid species. Early references to transplants can be found as well, with an Indian surgeon using skin flaps on noses as early as 600 BC. The first recorded instance of xenotransfusion (utilizing the blood of an animal for a human transfusion) was in 1667, and just over 100 years later, a Scottish surgeon used the word “transplant” for the first time. 

The first attempt at xenotransplantation (transplanting animal organs into human patients) is recorded in 1906 when a surgeon transplanted a porcine kidney to a middle-aged woman’s elbow. The same surgeon attempted to transplant a goat kidney to another patient only months later, but both grafts failed due to blood clotting. After a few more attempts from other surgeons, immunosuppression was a significant challenge, and experimentation paused until the 1960s. 

Around 60 years ago, experimentation resumed – this time with immunosuppressant medications. In 1984, a surgeon performed the first cross-species infant transplant, transplanting a baboon heart into a baby girl with lethal hypoplastic left heart syndrome. The patient only survived 21 more days, but the initial success of the transplant made this one of the most famous xenotransplantation cases. 

Scientists continue research in this area, acknowledging xenotransplantation as a potential life-saving treatment for patients waiting on organ donor lists. Although xenotransplantation is not a fully viable or approved treatment yet, this area of research holds great promise for the medical community. Let’s explore porcine kidney, heart, and lung transplantation — three of the leading areas of xenotransplantation research.

Porcine Kidney Xenotransplantation

In a recent article published by the National Kidney Foundation, the NKF Patient Education Team explained more about organ transplant shortages — and how porcine organs could help save lives. Over 90,000 patients are waiting for kidney transplants in America alone, but the demand far exceeds the transplant organ supply. Pig kidneys could offer faster access to life-saving treatments. 

Porcine kidneys are a popular choice for xenotransplantation experimentation because they are so similar to human kidneys in size, function, and abilities. Pig kidney transplants are projected to last around 30 years (based on preclinical modeling), which is comparable to a human kidney transplant. At this point, kidney xenotransplantation is only approved as an experimental treatment (in very rare and serious cases). However, in February of 2025, the U.S. Food and Drug Administration (FDA) approved human clinical trials for porcine kidney xenotransplantation — a significant advancement in this area. Researchers will continue studying infection risk, organ rejection, and porcine kidney success. 

In October of 2025, a porcine kidney transplant came close to setting a new record for xenotransplantation in a living patient, lasting almost nine months. The patient was able to have the porcine kidney removed when his body rejected it. The duration of this transplant demonstrates significant progress in xenotransplantation. As Leigh Peterson, Ph.D. and executive vice president of United Theraputics wrote in a press release, “this first-ever clinical trial of a xenokidney represents a significant step forward in our relentless mission to expand the availability of transplantable organs.”

Porcine Heart Xenotransplantation

While researchers and medical professionals continue to make great progress on porcine kidney xenotransplantation, others are hard at work on the feasibility of pig heart transplants. In 2022, a NYU Langone Health team successfully transplanted two genetically engineered porcine hearts into recently deceased donors, taking a step forward in understanding the mechanical, molecular, and immunological aspects of xenoheart transplantation. These medical professionals are motivated by a drive to help address the national organ shortage, with over 100,000 patients on an organ transplant waiting list and thirteen patients lost each day as they wait for life-saving transplants. 

At the end of 2025, porcine heart xenotransplantation is still currently only experimental, offered to patients who have no other therapy or treatment options. The first living patient to receive a porcine heart transplant survived two months — shorter than hoped, but still demonstrating a breakthrough in this medical field. The second xenoheart transplantation patient lived a remarkable nineteen months, providing a glimmer of hope for the over three thousand patients on the heart transplant waiting list. 

Porcine Lung Xenotransplantation

Another area of xenotransplantation research is porcine lungs, which have now been tested in a brain-dead patient. Transplantation experiments like this are extremely difficult, but surgeons were able to xenotransplant a porcine lung that lasted an impressive nine days. This strategy has been tested on pig-to-baboon lung transfers and is now being explored in human applications. The xenotransplant attempt failed because of the body’s immune rejection of the new lung, which remains one of the biggest challenges in xenotransplantation. However, every new attempt and experiment offers new data, progress, and hope for organ transplant patients. Almost 1,000 patients are on the lung transplant waiting list, and xenotransplantation research offers potential hope in this area. 

Xenotransplantation Challenges

Although there is significant progress in this medical field, xenotransplantation comes with many challenges. Researchers have encountered multiple types of immune rejection, including hyperacute rejection (generally occurring within 24 hours), delayed xenograft rejection, and chronic rejection (several months to years after the transplant). To help prevent rejection, medical researchers use immunosuppressive agents, steroids, calcineurin inhibitors, monoclonal antibodies, and other drugs and treatments. Research continues to advance in this area, attempting to overcome one of the biggest xenotransplantation challenges. 

Another challenge with xenotransplantation is the transmission of viruses. In some pre-clinical trials, researchers have observed the transmission of porcine cytomegalovirus (PCVM) and porcine circovirus type 3 (PCV3). This is one of the reasons it’s critical to work with a high-quality porcine tissue supplier who guarantees the quality and cleanliness of porcine samples. 

Other challenges that must be navigated are organ effectiveness, long-term monitoring, and ethical sourcing concerns. When choosing a porcine tissue supplier, work with a trusted supplier with a strong Quality Management System. Ensure that the supplier has benchmarks and industry certifications, USDA-inspected facilities, FDA compliance, and health certificates. The quality of porcine tissue sources directly influences the success of porcine organ xenotransplantation attempts and research. 

High-Quality Porcine Tissue Sourcing

As medical researchers continue moving forward with xenotransplantation research, porcine models play an important role. At Tissue Source, we are proud to provide high-quality, ethically sourced porcine tissue and organs for clinical, research, and educational use. We provide clients with:

• Customized Solutions: Whether you’re looking for porcine circulatory systems, digestive systems, musculoskeletal systems, nervous systems, or other tissues, organs, and systems, we offer flexible options to meet your needs.

• Traceability and Quality Assurance: We can provide traceability to individual animals as needed, or economical options for less stringent requirements.

• Commitment to Innovation: We are committed to providing ethically sourced, meticulously processed porcine organs, systems, and other tissues that meet the highest medical, scientific, and educational research standards. 

Our porcine tissue Quality Management System includes:

• Corrective and Preventive Action (CAPA)
• Deviations
• Non-Conformances
• Document Control
• Change Control
• Training
• Maintenance
• Preventative Maintenance
• Calibrations
• Supplier Qualifications
• Customer Feedback

Contact Tissue Source today to learn how our customizable solutions can support your next project or research study.

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