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2014 ; 2
(7
): 655-67
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gab.com Text
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The tumor microenvironment shapes lineage, transcriptional, and functional
diversity of infiltrating myeloid cells
#MMPMID24801837
Elpek KG
; Cremasco V
; Shen H
; Harvey CJ
; Wucherpfennig KW
; Goldstein DR
; Monach PA
; Turley SJ
Cancer Immunol Res
2014[Jul]; 2
(7
): 655-67
PMID24801837
show ga
Myeloid cells play important regulatory roles within the tumor environment by
directly promoting tumor progression and modulating the function of
tumor-infiltrating lymphocytes, and as such, they represent a potential
therapeutic target for the treatment of cancer. Although distinct subsets of
tumor-associated myeloid cells have been identified, a broader analysis of the
complete myeloid cell landscape within individual tumors and also across
different tumor types has been lacking. By establishing the developmental and
transcriptomic signatures of infiltrating myeloid cells from multiple primary
tumors, we found that tumor-associated macrophages (TAM) and tumor-associated
neutrophils (TAN), while present within all tumors analyzed, exhibited strikingly
different frequencies, gene expression profiles, and functions across cancer
types. We also evaluated the impact of anatomic location and circulating factors
on the myeloid cell composition of tumors. The makeup of the myeloid compartment
was determined by the tumor microenvironment rather than the anatomic location of
tumor development or tumor-derived circulating factors. Protumorigenic and
hypoxia-associated genes were enriched in TAMs and TANs compared with splenic
myeloid-derived suppressor cells. Although all TANs had an altered expression
pattern of secretory effector molecules, in each tumor type they exhibited a
unique cytokine, chemokine, and associated receptor expression profile. One such
molecule, haptoglobin, was uniquely expressed by 4T1 TANs and identified as a
possible diagnostic biomarker for tumors characterized by the accumulation of
myeloid cells. Thus, we have identified considerable cancer-specific diversity in
the lineage, gene expression, and function of tumor-infiltrating myeloid cells.