PMID- 21666482 OWN - NLM STAT- MEDLINE DCOM- 20111115 LR - 20211020 IS - 1531-7013 (Electronic) IS - 1087-2418 (Print) IS - 1087-2418 (Linking) VI - 16 IP - 4 DP - 2011 Aug TI - Preclinical and clinical studies on the induction of renal allograft tolerance through transient mixed chimerism. PG - 366-71 LID - 10.1097/MOT.0b013e3283484b2c [doi] AB - PURPOSE OF REVIEW: The present review updates the current status of research for induction of tolerance through a mixed chimerism approach in nonhuman primates and humans. RECENT FINDINGS: Allograft tolerance has been successfully achieved with a nonmyeloablative conditioning regimen and donor bone marrow transplantation in human leukocyte antigen (HLA)-matched and mismatched kidney transplantation. In HLA-matched kidney transplantation, persistent mixed chimerism and renal allograft tolerance has been achieved in some patients. In HLA-mismatched combinations, induction of persistent mixed chimerism has not been achieved using a nonmyeloablative preparative regimen. Nevertheless, the transient mixed chimerism that has been achieved has resulted in long-term renal allograft tolerance in the majority of patients. Recent preclinical studies have demonstrated that the presence of heterologous memory T-cell responses observed in primates, but not in rodents, may be a major barrier for induction of durable chimerism and tolerance in primates. Strategies to overcome such memory T-cell responses may, therefore, be of great value in the development of reliable protocols for clinical tolerance induction. SUMMARY: Induction of tolerance in clinical kidney transplantation has been achieved via mixed chimerism approaches. Improvements in the consistency and safety of tolerance induction and extension of successful protocols to other organs and to organs from deceased donors will all be among the next steps in bringing tolerance to a wider range of clinical applications. FAU - Kawai, Tatsuo AU - Kawai T AD - Transplant Center, Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts 02129, USA. FAU - Cosimi, A Benedict AU - Cosimi AB FAU - Sachs, David H AU - Sachs DH LA - eng GR - N01 AI1541/AI/NIAID NIH HHS/United States GR - U19 AI102405/AI/NIAID NIH HHS/United States GR - U01 DK080653/DK/NIDDK NIH HHS/United States GR - N01 AI015416/AI/NIAID NIH HHS/United States GR - 1U19DK080652-01/DK/NIDDK NIH HHS/United States GR - U19 DK080652/DK/NIDDK NIH HHS/United States GR - U01 DK080653-04/DK/NIDDK NIH HHS/United States GR - U19 DK080652-04/DK/NIDDK NIH HHS/United States GR - 5U01DK080653-04/DK/NIDDK NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Review PL - United States TA - Curr Opin Organ Transplant JT - Current opinion in organ transplantation JID - 9717388 RN - 0 (HLA Antigens) SB - IM MH - Animals MH - Bone Marrow Transplantation/*immunology MH - *Graft Survival MH - HLA Antigens/immunology MH - Histocompatibility MH - Humans MH - Immunologic Memory MH - Kidney Transplantation/*immunology MH - Primates MH - T-Lymphocytes/immunology MH - *Transplantation Chimera MH - *Transplantation Tolerance MH - Transplantation, Homologous MH - Treatment Outcome PMC - PMC3151013 MID - NIHMS313361 EDAT- 2011/06/15 06:00 MHDA- 2011/11/16 06:00 PMCR- 2012/08/01 CRDT- 2011/06/14 06:00 PHST- 2011/06/14 06:00 [entrez] PHST- 2011/06/15 06:00 [pubmed] PHST- 2011/11/16 06:00 [medline] PHST- 2012/08/01 00:00 [pmc-release] AID - 10.1097/MOT.0b013e3283484b2c [doi] PST - ppublish SO - Curr Opin Organ Transplant. 2011 Aug;16(4):366-71. doi: 10.1097/MOT.0b013e3283484b2c.