title: Umbilical cord blood dendritic cells are a rich source of soluble HLA-DR: synergistic effect of exosomes and dendritic cells on autologous or allogeneic T-Cell proliferation.
abstract: In this study, we compared soluble HLA-DR (sHLA-DR) production in the culture supernatants of various cell sources [T and B cells, monocytes and dendritic cells (DCs) either from adult peripheral blood (PB) or umbilical cord blood (UCB)]. DCs produced the highest amount of sHLA-DR molecules as compared to other cell sources, with UCB DCs producing the highest amount. Different kinetics of sHLA-DR production were found between immature and mature UCB DCs (mDC, iDC) (derived either from CD34(+) or CD14(+) cells). Maximum production of sHLA-DR was observed in 72-hour culture supernatants of both CD34- and CD14-derived mDCs, whereas it peaked in the 24-hour culture supernatants from iDC. sHLA-DR molecules were pelleted after sequential centrifugation from UCB CD34(+) DCs and were found to contain both 36 kD alpha-chain and 29 kD beta-chain of HLA-DR, CD86, and Fas molecules. These sHLA-DR containing vesicles/exosomes alone evoked weak proliferative responses from autologous and allogeneic T cells, but the immune response was significantly increased when vesicles/exosomes were presented with DCs.
authors.affiliation: Departments of Hematology and Rheumatology, Tokai University School of Medicine, Kanagawa, Japan.
authors.forename: Balgansuren
authors.initials: B
authors.lastname: Gansuvd
authors.forename: Masao
authors.initials: M
authors.lastname: Hagihara
authors.forename: Ayako
authors.initials: A
authors.lastname: Higuchi
authors.forename: Yoko
authors.initials: Y
authors.lastname: Ueda
authors.forename: Kei
authors.initials: K
authors.lastname: Tazume
authors.forename: Takahide
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: Namid
authors.initials: N
authors.lastname: Munkhtuvshin
authors.forename: Shunichi
authors.initials: S
authors.lastname: Kato
authors.forename: Tomomitsu
authors.initials: T
authors.lastname: Hotta
mesh_terms: D000328:Adult; D017951:Antigen Presentation; D001402:B-Lymphocytes / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002454:Cell Differentiation; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology*; D005260:Female; D005312:Fetal Blood / Q000166:cytology / Q000276:immunology*; D006684:HLA-DR Antigens / Q000097:blood* / Q000378:metabolism; D006801:Humans; D008213:Lymphocyte Activation; D009000:Monocytes / Q000276:immunology; D011247:Pregnancy; D013601:T-Lymphocytes / Q000276:immunology; D022161:Transport Vesicles / Q000378:metabolism*
chemical_list: D006684:HLA-DR Antigens