title: Cord blood CD4(+)CD25(+)-derived T regulatory cell lines express FoxP3 protein and manifest potent suppressor function.
abstract: CD4(+)CD25+ T regulatory (Treg) cells have been shown to critically regulate self and allograft tolerance in mice. Studies of human Treg cells have been hindered by low numbers present in peripheral blood and difficult purification. We found that cord blood was a superior source for Treg-cell isolation and cell line generation compared with adult blood. Cord blood CD4(+)CD25+ cells were readily purified and generated cell lines that consistently exhibited potent suppressor activity, with more than 95% suppression of allogeneic mixed lymphocyte reactions (MLRs) (29 of 30 donors). Cultured Treg cells blocked cytokine accumulation in MLRs, with a less robust inhibition of chemokine production. These cell lines uniformly expressed CD25, CD62L, CCR7, CD27, and intracellular cytotoxic T-lymphocyte antigen-4 (CTLA4). FoxP3 protein, but not mRNA, was specifically expressed. Upon restimulation with anti-CD3/CD28 beads, the cultured Treg cells produced minimal cytokines (interleukin-2 [IL-2], interferon-gamma [IFN-gamma], and IL-10) and preferentially expressed tumor growth factor-beta (TGF-beta) latency associated protein. Cytokine production, however, was restored to normal levels by restimulation with phorbol myristate acetate (PMA)/ionomycin. Cord blood-derived cultured suppressor cell function was predominantly independent of IL-10 and TGF-beta. These results demonstrate cord blood contains a significant number of Treg precursor cells capable of potent suppressor function after culture activation. Banked cord blood specimens may serve as a readily available source of Treg cells for immunotherapy.
authors.affiliation: Department of Pediatrics, University of Minnesota Cancer Center, Division of Hematology, Oncology, and Transplantation, Minneapolis, USA. wgodfrey@dendreon.com
authors.forename: Wayne R
authors.initials: WR
authors.lastname: Godfrey
authors.forename: Darrin J
authors.initials: DJ
authors.lastname: Spoden
authors.forename: Ying G
authors.initials: YG
authors.lastname: Ge
authors.forename: Seth R
authors.initials: SR
authors.lastname: Baker
authors.forename: Baoling
authors.initials: B
authors.lastname: Liu
authors.forename: Bruce L
authors.initials: BL
authors.lastname: Levine
authors.forename: Carl H
authors.initials: CH
authors.lastname: June
authors.forename: Bruce R
authors.initials: BR
authors.lastname: Blazar
authors.forename: Stephen B
authors.initials: SB
authors.lastname: Porter
mesh_terms: D000911:Antibodies, Monoclonal; D015704:CD4 Antigens / Q000378:metabolism; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism*; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005312:Fetal Blood / Q000166:cytology*; D051858:Forkhead Transcription Factors; D015870:Gene Expression / Q000276:immunology; D006801:Humans; D007108:Immune Tolerance / Q000276:immunology*; D016130:Immunophenotyping; D016753:Interleukin-10 / Q000378:metabolism; D010446:Peptide Fragments / Q000378:metabolism; D011498:Protein Precursors / Q000378:metabolism; D015375:Receptors, Interleukin-2 / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000378:metabolism; D053773:Transforming Growth Factor beta1
chemical_list: D000911:Antibodies, Monoclonal; D015704:CD4 Antigens; D004268:DNA-Binding Proteins; C418974:FOXP3 protein, human; D051858:Forkhead Transcription Factors; D010446:Peptide Fragments; D011498:Protein Precursors; D015375:Receptors, Interleukin-2; D016212:Transforming Growth Factor beta; D053773:Transforming Growth Factor beta1; D016753:Interleukin-10