title: Expansion of Valpha24(+)Vbeta11(+) NKT cells from cord blood mononuclear cells using IL-15, IL-7 and Flt3-L depends on monocytes.
abstract: Human Valpha24(+)Vbeta11(+) NKT cells are a unique T cell population specifically and potently activated by alpha-galactosylceramide (alphaGalCer; KRN7000) presented by CD1d. Here, we present a simple and efficient method for expanding Valpha24(+)Vbeta11(+) NKT cells from human cord blood mononuclear cells (CBMNC) using alphaGalCer in the presence of interleukin (IL)-15, IL-7 and Flt3-L. The addition of alphaGalCer from day 0, compared to its addition from day 8 or day 15, induced a greater expansion of NKT cells. The maximal expansion of NKT cells was observed after 15 days (2300-fold). Thereafter, the number of NKT cells decreased slowly, a decrease that was correlated with the diminution of CD1d-positive cells. NKT cell proliferation induced by alphaGalCer was not observed when CD1d-expressing monocytes were depleted from CBMNC, whereas B cell and dendritic cell depletions had no effect. Expanded NKT cells were CD4(+)CD8(-) and secreted both IL-4 and IFN-gamma. In this system, CD3(+) T cells and CD3(-)CD56(+) NK cells were also expanded. However, the expansion of NKT cells had no significant functional effect on T and NK cells. This expansion method of CBMNC-derived NKT cells is simple and may be helpful for clinical use.
authors.affiliation: Division of Cell Processing, Research Hospital, Institute of Medical Science, University of Tokyo, Tokyo, Japan.
authors.forename: Hikaru
authors.initials: H
authors.lastname: Okada
authors.forename: Tokiko
authors.initials: T
authors.lastname: Nagamura-Inoue
authors.forename: Yuka
authors.initials: Y
authors.lastname: Mori
authors.forename: Tsuneo A
authors.initials: TA
authors.lastname: Takahashi
mesh_terms: D018929:Cell Culture Techniques; D005312:Fetal Blood / Q000166:cytology; D005434:Flow Cytometry; D005699:Galactosylceramides / Q000276:immunology; D006801:Humans; D016130:Immunophenotyping; D019409:Interleukin-15 / Q000276:immunology; D015851:Interleukin-7 / Q000276:immunology; D007694:Killer Cells, Natural / Q000166:cytology* / Q000276:immunology; D007963:Leukocytes, Mononuclear / Q000166:cytology* / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D016131:Lymphocyte Subsets / Q000166:cytology* / Q000276:immunology; D051941:fms-Like Tyrosine Kinase 3 / Q000276:immunology
chemical_list: D005699:Galactosylceramides; D019409:Interleukin-15; D015851:Interleukin-7; C493154:alpha-galactosylceramide; C497970:FLT3 protein, human; D051941:fms-Like Tyrosine Kinase 3