PMID- 36277038 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20221025 IS - 1687-966X (Print) IS - 1687-9678 (Electronic) VI - 2022 DP - 2022 TI - hUC-MSCs Attenuate Acute Graft-Versus-Host Disease through Chi3l1 Repression of Th17 Differentiation. PG - 1052166 LID - 10.1155/2022/1052166 [doi] LID - 1052166 AB - Mesenchymal stem cells (MSCs) have already demonstrated definitive evidence of their clinical benefits in acute graft-versus-host disease (aGvHD) and other inflammatory diseases. However, the comprehensive mechanism of MSCs' immunomodulation properties has not been elucidated. To reveal their potential immunosuppressive molecules, we used RNA sequencing to analyze gene expression in different tissue-derived MSCs, including human bone marrow, umbilical cord, amniotic membrane, and placenta, and found that chitinase-3-like protein 1 (Chi3l1) was highly expressed in human umbilical cord mesenchymal stem cells (hUC-MSCs). We found that hUC-MSCs treated with interferon-gamma (IFN-gamma) and tumor necrosis factor-alpha (TNF-alpha) exhibited increased expression of Chi3l1 and concurrently repressed T-helper 17 cell (Th17) differentiation through inhibition of signal transducer and activator of transcription 3 (STAT3) activation. Furthermore, Chi3l1 knockdown hUC-MSCs exhibited impaired therapeutic efficacy in aGvHD mice with an increased inflammatory response by promoting Th17 cell differentiation, including an increase in IL-17A in the spleen, intestine, and serum. Collectively, these results reveal a new immunosuppressive molecule, Chi3l1, in hUC-MSCs in the treatment of aGvHD that regulates Th17 differentiation and inhibits STAT3 activation. These novel insights into the mechanisms of hUC-MSC immunoregulation may lead to the consistent production of hUC-MSCs with strong immunosuppressive functions and thus improved clinical utility. CI - Copyright (c) 2022 Weijiang Liu et al. FAU - Liu, Weijiang AU - Liu W AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. FAU - Yuan, Fulin AU - Yuan F AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. FAU - Bai, Haitao AU - Bai H AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. AD - Institute of Life Science, Hebei University, Baoding 071002, China. FAU - Liu, Yuanlin AU - Liu Y AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. FAU - Li, Xue AU - Li X AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. FAU - Wang, Yang AU - Wang Y AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. FAU - Zhang, Yi AU - Zhang Y AUID- ORCID: 0000-0003-2498-3948 AD - Department of Experimental Hematology and Biochemistry, Beijing Institute of Radiation Medicine, Beijing 100850, China. LA - eng PT - Journal Article DEP - 20221012 PL - United States TA - Stem Cells Int JT - Stem cells international JID - 101535822 PMC - PMC9582900 COIS- The authors declare that they have no competing interests. EDAT- 2022/10/25 06:00 MHDA- 2022/10/25 06:01 PMCR- 2022/10/12 CRDT- 2022/10/24 04:25 PHST- 2022/03/18 00:00 [received] PHST- 2022/06/04 00:00 [accepted] PHST- 2022/10/24 04:25 [entrez] PHST- 2022/10/25 06:00 [pubmed] PHST- 2022/10/25 06:01 [medline] PHST- 2022/10/12 00:00 [pmc-release] AID - 10.1155/2022/1052166 [doi] PST - epublish SO - Stem Cells Int. 2022 Oct 12;2022:1052166. doi: 10.1155/2022/1052166. eCollection 2022.