BM stromal cells ameliorate experimental autoimmune myasthenia gravis by altering the balance of Th cells through the secretion of IDO.
In addition to their capacity to differentiate, BM stromal cells (BMSC) have immunosuppressive qualities that make them strong candidates for use in cell therapy against human autoimmune diseases. We studied the immunoregulatory activities of BMSC on experimental autoimmune myasthenia gravis (EAMG) in vitro and in vivo. Intravenous administration of syngenic BMSC to EAMG-model rats on the day of their second immunization was effective in ameliorating the pathological features of the disease. In vitro, the proliferative ability of T cells or B cells from EAMG rats was inhibited when they were cocultured with BMSC at proper ratios. This inhibitory effect was at least partially dependent on the secretion of IDO. We also determined that the development of EAMG is accompanied by an imbalance among the Th1, Th2, Th17, and Treg cell subsets, and that this can be corrected by the administration of BMSC, which leads to an increase of Th2 (IL-4) and Treg (Foxp3) cells, and a reduction of Th1 (IFN-gamma) and Th17 (IL-17) cells, through an IDO-dependent mechanism. These results provide further insights into the pathogenesis of MG, EAMG, and other immune-mediated diseases, and support a potential role for BMSC in their treatment.
Kong
Qing-fei
QF
Department of Neurobiology, Harbin Medical University, Heilongjiang Provincial Key Laboratory of Neurobiology, Harbin, PR China.
Sun
Bo
B
Wang
Guang-you
GY
Zhai
Dong-xu
DX
Mu
Li-li
LL
Wang
Dan-dan
DD
Wang
Jing-hua
JH
Li
Rui
R
Li
Hu-lun
HL
D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D001854:Bone Marrow Cells / Q000276:immunology* / Q000378:metabolism; D016207:Cytokines / Q000096:biosynthesis / Q000276:immunology*; D005260:Female; D050503:Indoleamine-Pyrrole 2,3,-Dioxygenase / Q000276:immunology* / Q000378:metabolism; D020720:Myasthenia Gravis, Autoimmune, Experimental / Q000139:chemically induced / Q000276:immunology* / Q000378:metabolism; D010455:Peptides / Q000494:pharmacology; D051381:Rats; D011917:Rats, Inbred Lew; D017154:Stromal Cells / Q000276:immunology* / Q000378:metabolism; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000276:immunology / Q000378:metabolism
D016207:Cytokines; D050503:Indoleamine-Pyrrole 2,3,-Dioxygenase; D010455:Peptides