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2015 ; 146
(3
): 379-91
Nephropedia Template TP
gab.com Text
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English Wikipedia
Polysaccharide Agaricus blazei Murill stimulates myeloid derived suppressor cell
differentiation from M2 to M1 type, which mediates inhibition of tumour
immune-evasion via the Toll-like receptor 2 pathway
#MMPMID26194418
Liu Y
; Zhang L
; Zhu X
; Wang Y
; Liu W
; Gong W
Immunology
2015[Nov]; 146
(3
): 379-91
PMID26194418
show ga
Gr-1(+) CD11b(+) myeloid-derived suppressor cells (MDSCs) accumulate in
tumor-bearing animals and play a critical negative role during tumor
immunotherapy. Strategies for inhibition of MDSCs are expected to improve cancer
immunotherapy. Polysaccharide Agaricus blazei Murill (pAbM) has been found to
have anti-cancer activity, but the underlying mechanism of this is poorly
understood. Here, pAbM directly activated the purified MDSCs through inducing the
expression of interleukin-6 (IL-6), IL-12, tumour necrosis factor and inducible
nitric oxide synthase (iNOS), CD86, MHC II, and pSTAT1 of it, and only affected
natural killer and T cells in the presence of Gr-1(+) CD11b(+) monocytic MDSCs.
On further analysis, we demonstrated that pAbM could selectively block the
Toll-like receptor 2 (TLR2) signal of Gr-1(+) CD11b(+) MDSCs and increased their
M1-type macrophage characteristics, such as producing IL-12, lowering expression
of Arginase 1 and increasing expression of iNOS. Extensive study showed that
Gr-1(+) CD11b(+) MDSCs by pAbM treatment had less ability to convert the CD4(+)
CD25(-) cells into CD4(+) CD25(+) phenotype. Moreover, result from selective
depletion of specific cell populations in xenograft mice model suggested that the
anti-tumour effect of pAbM was dependent on Gr-1(+ ) CD11b(+) monocytes, nether
CD8(+) T cells nor CD4(+) T cells. In addition to, pAbM did not inhibit tumour
growth in TLR2(-/-) mice. All together, these results suggested that pAbM, a
natural product commonly used for cancer treatment, was a specific TLR2 agonist
and had potent anti-tumour effects through the opposite of the suppressive
function of Gr-1(+) CD11b(+) MDSCs.