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2016 ; 196
(5
): 2167-80
Nephropedia Template TP
gab.com Text
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English Wikipedia
Yeast-Derived Particulate ?-Glucan Treatment Subverts the Suppression of
Myeloid-Derived Suppressor Cells (MDSC) by Inducing Polymorphonuclear MDSC
Apoptosis and Monocytic MDSC Differentiation to APC in Cancer
#MMPMID26810222
Albeituni SH
; Ding C
; Liu M
; Hu X
; Luo F
; Kloecker G
; Bousamra M 2nd
; Zhang HG
; Yan J
J Immunol
2016[Mar]; 196
(5
): 2167-80
PMID26810222
show ga
Myeloid-derived suppressor cells (MDSC) are a heterogeneous population of
immature myeloid cells that promote tumor progression. In this study, we
demonstrated that activation of a C-type lectin receptor, dectin-1, in MDSC
differentially modulates the function of different MDSC subsets. Yeast-derived
whole ?-glucan particles (WGP; a ligand to engage and activate dectin-1, oral
treatment in vivo) significantly decreased tumor weight and splenomegaly in
tumor-bearing mice with reduced accumulation of polymorphonuclear MDSC but not
monocytic MDSC (M-MDSC), and decreased polymorphonuclear MDSC suppression in
vitro through the induction of respiratory burst and apoptosis. On a different
axis, WGP-treated M-MDSC differentiated into F4/80(+)CD11c(+) cells in vitro that
served as potent APC to induce Ag-specific CD4(+) and CD8(+) T cell responses in
a dectin-1-dependent manner. Additionally, Erk1/2 phosphorylation was required
for the acquisition of APC properties in M-MDSC. Moreover, WGP-treated M-MDSC
differentiated into CD11c(+) cells in vivo with high MHC class II expression and
induced decreased tumor burden when inoculated s.c. with Lewis lung carcinoma
cells. This effect was dependent on the dectin-1 receptor. Strikingly, patients
with non-small cell lung carcinoma that had received WGP treatment for 10-14 d
prior to any other treatment had a decreased frequency of
CD14(-)HLA-DR(-)CD11b(+)CD33(+) MDSC in the peripheral blood. Overall, these data
indicate that WGP may be a potent immune modulator of MDSC suppressive function
and differentiation in cancer.