title: Expression of CD1a and Type-1 Polarization Are Dissociated in Human Monocyte-Derived Dendritic Cells.
abstract: Ex vivo generated monocyte-derived dendritic cell (moDC)-vaccines have long been touted as promising immunotherapeutic agents for cancer treatment, although the response rate generally remains low. The reasons for this are still unclear and confounded by the diversity in manufacturing protocols that may affect moDC function. Preclinical studies have shown that the stimulatory function of dendritic cells can be improved by engaging invariant NKT cells in vivo through the presentation of the glycolipid alpha-galactosylceramide via CD1d. However, expression of CD1d on moDC has been shown to be negatively correlated with expression of CD1a, which in turn has been suggested to be a surrogate marker for IL-12 secreting type-1 polarized moDC, the preferred functional characteristics for cancer vaccines. Here we challenge this notion by showing that plasma-derived lipids drive functional levels of CD1d expression, while CD1a expression can vary considerably in these cells without being correlated with a loss of polarization or immunogenicity.
authors.affiliation: Malaghan Institute of Medical Research, Wellington, New Zealand.
authors.forename: Brigitta
authors.initials: B
authors.lastname: Mester
authors.affiliation: Malaghan Institute of Medical Research, Wellington, New Zealand.
authors.forename: Evelyn
authors.initials: E
authors.lastname: Bauer
authors.affiliation: Malaghan Institute of Medical Research, Wellington, New Zealand; Capital and Coast District Health Board, Wellington, New Zealand.
authors.forename: Catherine E
authors.initials: CE
authors.lastname: Wood
authors.affiliation: Malaghan Institute of Medical Research, Wellington, New Zealand; School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand; Maurice Wilkins Centre, Wellington, New Zealand.
authors.forename: Ian F
authors.initials: IF
authors.lastname: Hermans
authors.affiliation: Malaghan Institute of Medical Research, Wellington, New Zealand.
authors.forename: Olivier
authors.initials: O
authors.lastname: Gasser
mesh_terms: D018949:Antigens, CD1 / Q000378:metabolism*; D016764:Cell Polarity; D003713:Dendritic Cells / Q000166:cytology* / Q000378:metabolism*; D006801:Humans; D009000:Monocytes / Q000166:cytology*; D010641:Phenotype; D010949:Plasma
chemical_list: D018949:Antigens, CD1; C419393:CD1a antigen