Emma Samelson-Jones investigates the intricacies of kidney transplants, particularly how the body can accept a new kidney without rejecting it. She studies factors that contribute to this acceptance, known as 'tolerance,' including the ongoing presence of donor tissue and how the immune system detects and interacts with the transplanted organ. By understanding these mechanisms, she aims to improve long-term outcomes for kidney transplant patients and develop strategies that enhance transplant success.
Key findings
Kidney transplant tolerance is dependent on the presence of donor tissue, suggesting that ongoing exposure is crucial for maintaining acceptance of the organ.
Tolerance to transplanted kidneys fades when the donor kidney is removed, indicating that it is not a permanent state but rather an active process.
Switching the pathways through which the immune system recognizes donor antigens can change how tolerance is maintained, highlighting the importance of antigen recognition in transplant success.
Frequently asked questions
Does Dr. Samelson-Jones study kidney transplants?
Yes, she specifically studies kidney transplant tolerance and the factors that influence the body's acceptance of transplanted kidneys.
What treatments has Dr. Samelson-Jones researched for kidney transplant patients?
She has researched how the drug cyclosporine, when used in a short course, can induce tolerance to transplanted kidneys.
Is Dr. Samelson-Jones's work relevant to patients who have received a kidney transplant?
Yes, her findings directly influence strategies aimed at improving the long-term success of kidney transplants for patients.
Publications in plain English
Clinical Neurosciences Training for Psychiatry Residents: Implementing the Competency-Based Medical Education Framework.
2025
Academic psychiatry : the journal of the American Association of Directors of Psychiatric Residency Training and the Association for Academic Psychiatry
Seritan AL, Kaplan LE, Duong T, Peterson A, Hung E +4 more
Cardiac transplantation in adult patients with mental retardation: do outcomes support consensus guidelines?
2012
Psychosomatics
Samelson-Jones E, Mancini DM, Shapiro PA
Plain English This study examined the outcomes of five adult patients with mental retardation or similar intellectual disabilities who received heart transplants. The researchers found that these patients had survival times ranging from 4 to 16 years, with an average of over 12 years, and only one experienced issues adhering to medical advice due to caregiver challenges. This indicates that with proper support, individuals with intellectual disabilities can benefit greatly from heart transplants, suggesting that mental retardation should not automatically disqualify patients from receiving this life-saving procedure.
Who this helps: This helps patients with intellectual disabilities who need heart transplants and their families.
Carbon monoxide reduces pulmonary ischemia-reperfusion injury in miniature swine.
2010
The Journal of thoracic and cardiovascular surgery
Sahara H, Shimizu A, Setoyama K, Okumi M, Oku M +2 more
Plain English This study looked at how low doses of inhaled carbon monoxide can protect pig lungs from damage caused by a lack of blood flow followed by its restoration. Researchers found that pigs treated with carbon monoxide had nearly double the levels of oxygen in their blood (454 mm Hg) compared to those that were not treated (227 mm Hg) two hours after the procedure. This is important because it shows that carbon monoxide can reduce lung injury and inflammation, which may lead to better recovery outcomes in similar situations.
Who this helps: This helps patients undergoing surgeries that can lead to lung damage from blood flow issues.
Role of persistence of antigen and indirect recognition in the maintenance of tolerance to renal allografts.
2008
Transplantation
Okumi M, Fishbein JM, Griesemer AD, Gianello PR, Hirakata A +6 more
Plain English Kidney transplant tolerance induced by a short course of cyclosporine depends on the ongoing presence of donor tissue and on how the immune system recognizes donor antigens. Removing the donor kidney caused tolerance to fade over time, and switching antigen recognition pathways shifted the mechanism of tolerance maintenance. These findings reveal that tolerance is an active, antigen-dependent process rather than a permanent state.
Long-term acceptance of fully allogeneic cardiac grafts by cotransplantation of vascularized thymus in miniature swine.
2006
Transplantation
Nobori S, Samelson-Jones E, Shimizu A, Hisashi Y, Yamamoto S +9 more
Plain English This study looked at how well hearts from different donors could be accepted by miniature pigs after being transplanted along with a piece of a thymus, an organ important for immune response. The results showed that the pigs that received both a heart and a thymus piece kept their heart grafts for much longer—significantly longer than those that only received a heart, with some lasting long-term after a 28-day period of immunosuppressive treatment. This is important because it demonstrates a new way to improve organ transplant acceptance even when there is a major mismatch between the donor and recipient.
Who this helps: Patients needing heart transplants may benefit from this research.
Role of the thymus in transplantation tolerance in miniature swine: V. Deficiency of the graft-to-thymus pathway of tolerance induction in recipients of cardiac transplants.
2006
Transplantation
Yamamoto S, Teranishi K, Kamano C, Samelson-Jones E, Arakawa H +6 more
Plain English This study looked at how the thymus, a part of the immune system, affects the acceptance of heart transplants in miniature pigs. Researchers found that while the thymus is important for creating tolerance to kidney transplants, it doesn't work as well for heart transplants. In this study, when they treated pigs with immune-suppressing drugs but didn't enhance thymus function, all pigs rejected their heart transplants within 35 days, showing a clear failure in developing tolerance.
Who this helps: This research can benefit doctors and researchers working on improving heart transplant outcomes.
Thymic rejuvenation and the induction of tolerance by adult thymic grafts.
2006
Proceedings of the National Academy of Sciences of the United States of America
Nobori S, Shimizu A, Okumi M, Samelson-Jones E, Griesemer A +3 more
Plain English This study looked at whether an older, shriveled thymus could still function well enough to help the body tolerate transplanted organs if it was grafted into younger patients without a thymus. The researchers found that when they transplanted aged thymus tissue into young animals, it could regain its structure and function, boosting its ability to prevent rejection of transplanted organs. This is important because it shows that older thymus tissue can still support organ transplants, potentially improving outcomes for patients needing transplants later in life.
Who this helps: This helps patients who need organ transplants, particularly older adults.
Vascularized thymic lobe transplantation in a pig-to-baboon model: a novel strategy for xenogeneic tolerance induction and T-cell reconstitution.
2005
Transplantation
Yamamoto S, Lavelle JM, Vagefi PA, Arakawa H, Samelson-Jones E +10 more
Plain English Researchers studied a new method of transplanting thymus tissue from pigs to baboons to see if it could help the baboons' immune systems accept the foreign tissue without rejecting it. They found that, in the short term, the transplanted thymus tissue helped the baboons produce immune cells that recognized the pig tissue as safe; however, these positive effects lasted only about two months before their immune systems started rejecting the grafts. This matters because finding a way to make organ transplants from pigs to humans successful could address shortages in human organ donations.
Who this helps: This could benefit patients waiting for organ transplants.