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2015 ; 4
(7
): e1014242
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Immunoglobulin-like transcript 3 is expressed by myeloid-derived suppressor cells
and correlates with survival in patients with non-small cell lung cancer
#MMPMID26140237
de Goeje PL
; Bezemer K
; Heuvers ME
; Dingemans AC
; Groen HJ
; Smit EF
; Hoogsteden HC
; Hendriks RW
; Aerts JG
; Hegmans JP
Oncoimmunology
2015[Jul]; 4
(7
): e1014242
PMID26140237
show ga
Myeloid-derived suppressor cells (MDSCs) play an important role in immune
suppression and accumulate under pathologic conditions such as cancer and chronic
inflammation. They comprise a heterogeneous population of immature myeloid cells
that exert their immunosuppressive function via a variety of mechanisms.
Immunoglobulin-like transcript 3 (ILT3) is a receptor containing immunoreceptor
tyrosine-based inhibition motifs (ITIMs) that can be expressed on
antigen-presenting cells and is an important regulator of dendritic cell
tolerance. ILT3 exists in a membrane-bound and a soluble form and can interact
with a yet unidentified ligand on T cells and thereby induce T-cell anergy,
regulatory T cells, or T suppressor cells. In this study, we analyzed freshly
isolated peripheral blood mononuclear cells (PBMCs) of 105 patients with
non-small cell lung cancer and 20 healthy controls and demonstrated for the first
time that ILT3 is expressed on MDSCs. We show that increased levels of
circulating MDSCs correlate with reduced survival. On the basis of ILT3 cell
surface expression, an ILT3(low) and ILT3(high) population of polymorphonuclear
(PMN)-MDSCs could be distinguished. Interestingly, in line with the
immunosuppressive function of ILT3 on dendritic cells, patients with an increased
proportion of PMN-MDSCs and an increased fraction of the ILT3(high) subset had a
shorter median survival than patients with elevated PMN-MDSC and a smaller
ILT3(high) fraction. No correlation between the ILT3(high) subset and other
immune variables was found. ILT3 expressed on MDSCs might reflect a previously
unknown mechanism by which this cell population induces immune suppression and
could therefore be an attractive target for immune intervention.