title: [Mesenchymal stem cells suppress allogeneic T cell responses by secretion of TGF-beta1].
abstract: To investigate the mechanisms underlying the issue that bone marrow mesenchymal stem cells (MSC) could trigger low responsiveness of allogeneic T lymphocytes against alloantigens, phenotypes of T cells were analysed with flow cytometry before and after coculture of allogeneic T lymphocytes with MSC. Further, expression of cytokines including IL-4, IFN-gamma and TGF-beta1 was evaluated by RT-PCR and ELISA as well. The results showed that CD8(+) subpopulation was increased and CD25(+) subset was decreased in proportion after coculture of allogeneic T lymphocytes with MSC for 2 weeks. RT-PCR assay showed that MSC expressed TGF-beta1 but not IL-4 and IFN-gamma, and the result was further proved by ELISA assay showing that the secretion of TGF-beta1 reached to 1 ng/ml in 72 hours. It was concluded that allogeneic MSC suppressed T cells activation by alteration of T cell subpopulations. The suppressive effect was at least in part due to the secretion of TGF-beta1. The results indicate that MSC pretreatment might be useful in the prevention of GVHD in HLA-mismatched bone marrow transplantation and further donors for hematopoietic stem cells could be selected from greater potentials.
authors.affiliation: Center of Hematopoietic Stem Cell Transplantation, Hospital Affiliated to Academy of Military Medical Sciences, Beijing 100039, China. JianLin-Chen@hotmail.com
authors.forename: Jian-Lin
authors.initials: JL
authors.lastname: Chen
authors.forename: Zi-Kuan
authors.initials: ZK
authors.lastname: Guo
authors.forename: Chen
authors.initials: C
authors.lastname: Xu
authors.forename: Yu-Hang
authors.initials: YH
authors.lastname: Li
authors.forename: Chun-Mei
authors.initials: CM
authors.lastname: Hou
authors.forename: Ning
authors.initials: N
authors.lastname: Mao
authors.forename: Hu
authors.initials: H
authors.lastname: Chen
mesh_terms: D001854:Bone Marrow Cells / Q000502:physiology*; D016026:Bone Marrow Transplantation / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D006801:Humans; D007519:Isoantigens / Q000276:immunology*; D007959:Lymphocyte Culture Test, Mixed; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000378:metabolism / Q000502:physiology*; D013601:T-Lymphocytes / Q000276:immunology*; D016212:Transforming Growth Factor beta / Q000502:physiology*; D053773:Transforming Growth Factor beta1
chemical_list: D007519:Isoantigens; C508960:TGFB1 protein, human; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1