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2015 ; 144
(4
): 661-7
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Bright expression of CD91 identifies highly activated human dendritic cells that
can be expanded by defensins
#MMPMID25351513
Cappelletti M
; Presicce P
; Calcaterra F
; Mavilio D
; Della Bella S
Immunology
2015[Apr]; 144
(4
): 661-7
PMID25351513
show ga
CD91 is a scavenger receptor expressed by different immune cells and its ligands
defensins have been demonstrated to contribute to immune responses against
infections and tumours. We previously demonstrated that CD91 is expressed on
human monocyte-derived dendritic cells (moDCs) and that human defensins stimulate
in vitro the activation of these cells. In this study, we observed that CD91 is
expressed at different levels on two distinct moDC subsets: CD91(dim) and
CD91(bright) moDCs. Although CD91(bright) moDCs represented a small proportion of
total moDCs, this subset showed higher levels of activation and maturation
markers compared with CD91(dim) moDCs. The frequency of CD91(bright) moDCs
increased by ~ 50% after in vitro stimulation with recombinant human neutrophil
peptide-1 (rHNP-1) and recombinant human ? defensin-1 (rHBD-1), while
lipopolysaccharide (LPS) stimulation decreased it by ~ 35%. Both defensins
up-regulated moDC expression of CD80, CD40, CD83 and HLA-DR, although to a lower
extent compared with LPS. Notably, upon culture with rHNP-1 and rHBD-1,
CD91(bright) moDCs maintained their higher activation/maturation status, whereas
this was lost upon culture with LPS. Our findings suggest that defensins promote
the differentiation into activated CD91(bright) DCs and may encourage the
exploitation of the CD91/defensins axis as a novel therapeutic strategy to
potentiate antimicrobial and anti-tumour immune response.