PMID- 31892638 OWN - NLM STAT- MEDLINE DCOM- 20210713 LR - 20210713 IS - 1708-8267 (Electronic) IS - 1081-5589 (Linking) VI - 68 IP - 3 DP - 2020 Mar TI - Indoleamine 2,3-dioxgenase-transfected mesenchymal stem cells suppress heart allograft rejection by increasing the production and activity of dendritic cells and regulatory T cells. PG - 728-737 LID - 10.1136/jim-2019-001160 [doi] AB - Expression of indoleamine 2,3-dioxygenase (IDO) in mesenchymal stem cells (MSC) is thought to contribute to MSC-mediated immunosuppression. A lentiviral-based transgenic system was used to generate bone marrow stem cells (BMSC) which stably expressed IDO (IDO-BMSCs). Coculture of IDO-BMSCs with dendritic cells (DC) or T cells was used to evaluate the immunomodulatory effect of IDO-BMSCs. A heterotopic heart transplant model in rats was used to evaluate allograft rejection after IDO-BMSC treatment. Mechanisms of IDO-BMSC-mediated immunosuppression were investigated by evaluating levels of proinflammatory and anti-inflammatory cytokines, and production of Tregs. A significant decrease in DC marker-positive cells and a significant increase in Tregs were observed in IDO-BMSC cocultured. Treatment of transplanted rats with IDO-BMSCs was associated with significantly prolonged graft survival. Compared with the control groups, transplanted animals treated with IDO-BMSCs had a (1) significantly higher ejection fraction and fractional shortening, (2) significantly lower expression of CD86, CD80, and MHCII, and significantly higher expression in CD274, and Tregs, and (3) significantly higher levels of interleukin-10 (IL-10), transforming growth factor beta-1 (TGF-beta1), TGF-beta2, and TGF-beta3, and significantly lower levels of IL-2 and interferon gamma. Our results expand our understanding of the molecular mechanisms underlying suppression of heart allograft rejection via IDO-expressing BMSCs. CI - (c) American Federation for Medical Research 2020. No commercial re-use. See rights and permissions. Published by BMJ. FAU - He, Ji-Gang AU - He JG AD - Department of Cardiac and Vascular Surgery, First People's Hospital of Yunnan Province, Kunming, China. FAU - Li, Bei-Bei AU - Li BB AD - Department of Cardiac and Vascular Surgery, First People's Hospital of Yunnan Province, Kunming, China. FAU - Zhou, Liang AU - Zhou L AD - Department of Cardiology, First People's Hospital of Yunnan Province, Kunming, China. FAU - Yan, Dan AU - Yan D AD - Intensive Care Unit, First People's Hospital of Yunnan Province, Kunming, China. FAU - Xie, Qiao-Li AU - Xie QL AD - Department of Cardiac and Vascular Surgery, First People's Hospital of Yunnan Province, Kunming, China. FAU - Zhao, Wei AU - Zhao W AUID- ORCID: 0000-0003-0187-9224 AD - Department of Cardiac and Vascular Surgery, First People's Hospital of Yunnan Province, Kunming, China jiganghe999@163.com. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20191231 PL - England TA - J Investig Med JT - Journal of investigative medicine : the official publication of the American Federation for Clinical Research JID - 9501229 RN - 0 (Cytokines) RN - 0 (Indoleamine-Pyrrole 2,3,-Dioxygenase) RN - 130068-27-8 (Interleukin-10) SB - IM MH - Allografts MH - Animals MH - Bone Marrow Cells MH - Cells, Cultured MH - Coculture Techniques MH - Cytokines/metabolism MH - Dendritic Cells/metabolism MH - Graft Rejection/*prevention & control MH - *Heart Transplantation MH - Indoleamine-Pyrrole 2,3,-Dioxygenase/immunology/*metabolism MH - Interleukin-10/metabolism MH - Lentivirus/genetics MH - Male MH - Mesenchymal Stem Cells/drug effects/*metabolism MH - Rats MH - Rats, Sprague-Dawley MH - Rats, Wistar MH - Stem Cells/metabolism MH - T-Lymphocytes, Regulatory/metabolism MH - Transfection MH - Transplantation Tolerance OTO - NOTNLM OT - stem cells COIS- Competing interests: None declared. EDAT- 2020/01/02 06:00 MHDA- 2021/07/14 06:00 CRDT- 2020/01/02 06:00 PHST- 2019/12/07 00:00 [accepted] PHST- 2020/01/02 06:00 [pubmed] PHST- 2021/07/14 06:00 [medline] PHST- 2020/01/02 06:00 [entrez] AID - jim-2019-001160 [pii] AID - 10.1136/jim-2019-001160 [doi] PST - ppublish SO - J Investig Med. 2020 Mar;68(3):728-737. doi: 10.1136/jim-2019-001160. Epub 2019 Dec 31.