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2018 ; 9
(ä): 608
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Factors Influencing the Differentiation of Human Monocytic Myeloid-Derived
Suppressor Cells Into Inflammatory Macrophages
#MMPMID29632539
Bayik D
; Tross D
; Klinman DM
Front Immunol
2018[]; 9
(ä): 608
PMID29632539
show ga
Monocytic myeloid-derived suppressor cells (mMDSC) accumulate within tumors where
they create an immunosuppressive milieu that inhibits the activity of cytotoxic T
and NK cells thereby allowing cancers to evade immune elimination. The toll-like
receptors 7/8 agonist R848 induces human mMDSC to mature into inflammatory
macrophage (MAC(inflam)). This work demonstrates that TNF?, IL-6, and IL-10
produced by maturing mMDSC are critical to the generation of MAC(inflam).
Neutralizing any one of these cytokines significantly inhibits R848-dependent
mMDSC differentiation. mMDSC cultured in pro-inflammatory cytokine IFN? or the
combination of TNF? plus IL-6 differentiate into MAC(inflam) more efficiently
than those treated with R848. These mMDSC-derived macrophages exert anti-tumor
activity by killing cancer cells. RNA-Seq analysis of the genes expressed when
mMDSC differentiate into MAC(inflam) indicates that TNF? and the transcription
factors NF-?B and STAT4 are major hubs regulating this process. These findings
support the clinical evaluation of R848, IFN?, and/or TNF? plus IL-6 for
intratumoral therapy of established cancers.