PMID- 30801921 OWN - NLM STAT- MEDLINE DCOM- 20200714 LR - 20230124 IS - 1600-6143 (Electronic) IS - 1600-6135 (Print) IS - 1600-6135 (Linking) VI - 19 IP - 6 DP - 2019 Jun TI - The "other" mTOR complex: New insights into mTORC2 immunobiology and their implications. PG - 1614-1621 LID - 10.1111/ajt.15320 [doi] AB - A central role of the mechanistic target of rapamycin (mTOR) in regulation of fundamental cell processes is well recognized. mTOR functions in two distinct complexes: rapamycin-sensitive mTOR complex (C) 1 and rapamycin-insensitive mTORC2. While the role of mTORC1 in shaping immune responses, including transplant rejection, and the influence of its antagonism in promoting allograft tolerance have been studied extensively using rapamycin, lack of selective small molecule inhibitors has limited understanding of mTORC2 biology. Within the past few years, however, intracellular localization of mTORC2, its contribution to mitochondrial fitness, cell metabolism, cytoskeletal modeling and cell migration, and its role in differentiation and function of immune cells have been described. Studies in mTORC2 knockdown/knockout mouse models and a new class of dual mTORC1/2 inhibitors, have shed light on the immune regulatory functions of mTORC2. These include regulation of antigen-presenting cell, NK cell, T cell subset, and B cell differentiation and function. mTORC2 has been implicated in regulation of ischemia/reperfusion injury and graft rejection. Potential therapeutic benefits of antagonizing mTORC2 to inhibit chronic rejection have also been described, while selective in vivo targeting strategies using nanotechnology have been developed. We briefly review and discuss these developments and their implications. CI - (c) 2019 The American Society of Transplantation and the American Society of Transplant Surgeons. FAU - Dai, Helong AU - Dai H AD - Department of Surgery, Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania. AD - Department of Urological Organ Transplantation, The Second Xiangya Hospital of Central South University, Changsha, Hunan, China. FAU - Thomson, Angus W AU - Thomson AW AD - Department of Surgery, Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania. AD - Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania. LA - eng GR - R21 AI137799/AI/NIAID NIH HHS/United States GR - 81800664/National Natural Science Foundation of China/International GR - U19 AI131453/AI/NIAID NIH HHS/United States GR - U01 AI136779/AI/NIAID NIH HHS/United States GR - R01 AI118777/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20190319 PL - United States TA - Am J Transplant JT - American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons JID - 100968638 RN - EC 2.7.11.1 (Mechanistic Target of Rapamycin Complex 1) RN - EC 2.7.11.1 (Mechanistic Target of Rapamycin Complex 2) SB - IM MH - Animals MH - B-Lymphocytes/immunology MH - Humans MH - Immunity, Innate MH - Mechanistic Target of Rapamycin Complex 1/immunology MH - Mechanistic Target of Rapamycin Complex 2/antagonists & inhibitors/genetics/*immunology MH - Mice MH - Mitochondria/metabolism MH - Models, Immunological MH - Reperfusion Injury/immunology MH - T-Lymphocyte Subsets/immunology MH - Transplantation Immunology PMC - PMC6538441 MID - NIHMS1013742 OTO - NOTNLM OT - basic (laboratory) research/science OT - cellular biology OT - immunobiology OT - immunosuppressant - mechanistic target of rapamycin (mTOR) OT - innate immunity OT - lymphocyte biology OT - molecular biology OT - tissue injury and repair OT - translational research/science COIS- DISCLOSURE The authors of this manuscript have no conflicts of interest to disclose as described by the American Journal of Transplantation. EDAT- 2019/02/26 06:00 MHDA- 2020/07/15 06:00 PMCR- 2020/06/01 CRDT- 2019/02/26 06:00 PHST- 2019/01/16 00:00 [received] PHST- 2019/02/10 00:00 [revised] PHST- 2019/02/15 00:00 [accepted] PHST- 2019/02/26 06:00 [pubmed] PHST- 2020/07/15 06:00 [medline] PHST- 2019/02/26 06:00 [entrez] PHST- 2020/06/01 00:00 [pmc-release] AID - S1600-6135(22)09106-7 [pii] AID - 10.1111/ajt.15320 [doi] PST - ppublish SO - Am J Transplant. 2019 Jun;19(6):1614-1621. doi: 10.1111/ajt.15320. Epub 2019 Mar 19.