title: B7-H1 inhibits T cell proliferation through MHC class II in human mesenchymal stem cells.
abstract: B7-H1 on mesenchymal stem cells (MSCs) is known to modulate immune response. However, its expression pattern and exact immunomodulatory mechanism are unclear. In this study, we examined the immunomodulatory mechanism through the expression pattern of B7-H1 and major histocompatibility complex class II in various MSCs. Human bone marrow, adipose tissue, and cord blood MSCs were isolated and cultured. B7-H1, HLA-ABC, and HLA-DR expression on MSCs by interferon-γ (IFN-γ) was detected time-dependently by flow cytometry. The inhibitory effect of MSCs on T lymphocytes was observed in phytohemagglutinin antigen-induced T cell proliferation assay. The expression of B7-H1 was rapidly induced, but the expression of HLA-DR was induced at 48 hours after IFN-γ treatment. The inhibitory effect of MSCs on T cell proliferation could be restored when the anti-B7-H1 monoclonal antibody was used to block the B7-H1, or when the HLA-DRα small interfering RNA was used to interfere with its expression. These results show that MSCs could inhibit the T cell proliferation and activation by B7-H1 depending on the presence of HLA-DR. Therefore, MSCs would have a strong effect on immune diseases such as graft-versus-host disease and autoimmune diseases when MSCs are primed with IFN-γ 48 hours before transplantation.
authors.affiliation: Department of Pediatrics, Ajou University School of Medicine, Suwon, Republic of Korea; Biomedical Research Institute, Lifeliver Co Ltd, Yongin, Republic of Korea.
authors.forename: I K
authors.initials: IK
authors.lastname: Jang
authors.affiliation: Dongguk University Research Institute of Biotechnology, Dongguk University, Seoul, Republic of Korea.
authors.forename: H H
authors.initials: HH
authors.lastname: Yoon
authors.affiliation: Biomedical Research Institute, Lifeliver Co Ltd, Yongin, Republic of Korea.
authors.forename: M S
authors.initials: MS
authors.lastname: Yang
authors.affiliation: Biomedical Research Institute, Lifeliver Co Ltd, Yongin, Republic of Korea.
authors.forename: J E
authors.initials: JE
authors.lastname: Lee
authors.affiliation: Biomedical Research Institute, Lifeliver Co Ltd, Yongin, Republic of Korea.
authors.forename: D-H
authors.initials: DH
authors.lastname: Lee
authors.affiliation: Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
authors.forename: M W
authors.initials: MW
authors.lastname: Lee
authors.affiliation: Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
authors.forename: D S
authors.initials: DS
authors.lastname: Kim
authors.affiliation: Department of Pediatrics, Ajou University School of Medicine, Suwon, Republic of Korea. Electronic address: pedpje@ajou.ac.kr.
authors.forename: J E
authors.initials: JE
authors.lastname: Park
mesh_terms: D060890:B7-H1 Antigen / Q000502:physiology*; D049109:Cell Proliferation; D005434:Flow Cytometry; D000949:Histocompatibility Antigens Class II / Q000502:physiology*; D006801:Humans; D059630:Mesenchymal Stem Cells / Q000166:cytology*; D034622:RNA Interference; D013601:T-Lymphocytes / Q000502:physiology*
chemical_list: D060890:B7-H1 Antigen; C423236:CD274 protein, human; D000949:Histocompatibility Antigens Class II