title: Limited Immunogenicity of Human Induced Pluripotent Stem Cell-Derived Cartilages.
abstract: Articular cartilage damage does not spontaneously heal and could ultimately result in a loss of joint function. Damaged cartilage can be repaired with cell/tissue sources that are transplanted, however, autologous chondrocytes are limited in number as a cell source. Induced pluripotent stem cells (iPSCs) are a relatively new and abundant cell source and can be made from the patient, but at a considerable cost. Because cartilage is immunoprivileged tissue, allogeneic cartilages have been transplanted effectively without matching for human leukocyte antigen (HLA), but are difficult to acquire due to scarcity of donors. In this study, we examined the immunogenicity of human iPSC-derived cartilages (hiPS-Carts) in vitro to evaluate whether allogeneic hiPS-Carts can be a new cell/tissue source. The cells in hiPS-Carts expressed limited amounts of major histocompatibility complex (MHC) class I (HLA-ABC) and MHC class II (HLA-DRDQDP). Treatment with interferon γ (IFNγ) induced the expression of MHC class I, but not MHC class II in hiPS-Carts. A mixed lymphocyte reaction assay showed that hiPS-Carts stimulated the proliferation of neither T cells nor the activation of NK cells. Furthermore, hiPS-Carts suppressed the proliferation of T cells stimulated with interleukin 2 and phytohemagglutinin (PHA). Together with previously reported findings, these results suggest that hiPS-Carts are no more antigenic than human cartilage. Additionally, in combination with the fact that iPSCs are unlimitedly expandable and thus can supply unlimited amounts of iPS-Carts from even one iPSC line, they suggest that allogeneic hiPS-Carts are a candidate source for transplantation to treat articular cartilage damage.
authors.affiliation: 1 Cell Induction and Regulation Field, Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University , Kyoto, Japan .|2 Department of Pediatrics, Osaka University Graduate School of Medicine , Osaka, Japan .
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kimura
authors.affiliation: 1 Cell Induction and Regulation Field, Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University , Kyoto, Japan .
authors.forename: Akihiro
authors.initials: A
authors.lastname: Yamashita
authors.affiliation: 2 Department of Pediatrics, Osaka University Graduate School of Medicine , Osaka, Japan .
authors.forename: Keiichi
authors.initials: K
authors.lastname: Ozono
authors.affiliation: 1 Cell Induction and Regulation Field, Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University , Kyoto, Japan .
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Tsumaki
mesh_terms: D001705:Bioprosthesis; D002358:Cartilage, Articular; D006680:HLA Antigens / Q000276:immunology*; D006801:Humans; D057026:Induced Pluripotent Stem Cells / Q000276:immunology*; D007371:Interferon-gamma / Q000276:immunology*; D012038:Regeneration / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006680:HLA Antigens; C573415:IFNG protein, human; D007371:Interferon-gamma
keywords: allogeneic transplantation; articular cartilage; induced pluripotent stem (iPS) cells; regeneration