Immunomodulatory effects of mesenchymal stromal cells-derived exosome.
The mechanisms underlying immunomodulatory ability of mesenchymal stromal cells (MSCs) remain unknown. Recently, studies suggested that the immunomodulatory activity of MSCs is largely mediated by paracrine factors. Among which, exosome is considered to play a major role in the communication between MSCs and target tissue. The aim of our study is to investigate the effect of MSCs-derived exosome on peripheral blood mononuclear cells (PBMCs), especially T cells. We find that the MSCs-derived exosome extracted from healthy donors' bone marrow suppressed the secretion of pro-inflammatory factor TNF-α and IL-1β, but increased the concentration of anti-inflammatory factor TGF-β during in vitro culture. In addition, exosome may induce conversion of T helper type 1 (Th1) into T helper type 2 (Th2) cells and reduced potential of T cells to differentiate into interleukin 17-producing effector T cells (Th17). Moreover, the level of regulatory T cells (Treg) and cytotoxic T lymphocyte-associated protein 4 were also increased. These results suggested that MSC-derived exosome possesses the immunomodulatory properties. However, it showed no effects on the proliferation of PBMCs or CD3+ T cells, but increases the apoptosis of them. In addition, indoleamine 2, 3-dioxygenase (IDO) was previously shown to mediate the immunoregulation of MSCs, which was increased in PBMCs co-cultured with MSCs. In our study, IDO showed no significant changes in PBMCs exposed to MSCs-derived exosome. We conclude that exosome and MSCs might differ in their immune-modulating activities and mechanisms.
Southern Medical University, Guangzhou, 510515, China.|Department of Hematology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China.
Wancheng
W
Chen
Southern Medical University, Guangzhou, 510515, China.
Yukai
Y
Huang
Southern Medical University, Guangzhou, 510515, China.
Jiaochan
J
Han
Southern Medical University, Guangzhou, 510515, China.
Lili
L
Yu
Southern Medical University, Guangzhou, 510515, China.
Yanli
Y
Li
Southern Medical University, Guangzhou, 510515, China.
Ziyuan
Z
Lu
Southern Medical University, Guangzhou, 510515, China.|Department of Hematology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China.
Hongbo
H
Li
Department of Hematology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China.
Zenghui
Z
Liu
Southern Medical University, Guangzhou, 510515, China.|Department of Hematology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China.
Chenyan
C
Shi
Southern Medical University, Guangzhou, 510515, China.|Department of Hematology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China.
Fengqi
F
Duan
Southern Medical University, Guangzhou, 510515, China. jdxiao111@163.com.|Department of Hematology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China. jdxiao111@163.com.|Department of Hematology, The Third Affiliated Hospital of Southern Medical University (Academy of Orthopedics-Guangdong Province), Guangzhou, 510630, China. jdxiao111@163.com.
Yang
Y
Xiao
D017209:Apoptosis; D060908:CTLA-4 Antigen / Q000378:metabolism; D002454:Cell Differentiation; D055252:Cell-Derived Microparticles / Q000276:immunology*; D002478:Cells, Cultured; D018920:Coculture Techniques; D016207:Cytokines / Q000378:metabolism; D055354:Exosomes / Q000276:immunology*; D006801:Humans; D056747:Immunomodulation; D008213:Lymphocyte Activation; D059630:Mesenchymal Stem Cells / Q000276:immunology*; D019899:Paracrine Communication; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D018417:Th1 Cells / Q000276:immunology*; D058408:Th1-Th2 Balance; D058504:Th17 Cells / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology*
D060908:CTLA-4 Antigen; D016207:Cytokines
Exosome; Immunomodulation; Mesenchymal stem cells; Peripheral blood mononuclear cells