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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Oncoimmunology
2015 ; 4
(9
): e1034918
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Cancer associated fibroblasts have phenotypic and functional characteristics
similar to the fibrocytes that represent a novel MDSC subset
#MMPMID26405600
Gunaydin G
; Kesikli SA
; Guc D
Oncoimmunology
2015[Sep]; 4
(9
): e1034918
PMID26405600
show ga
Circulating fibrocytes were reported to represent a novel myeloid-derived
suppressor cell (MDSC) subset and they were also proposed to be involved in the
tumor immune escape. This novel fibrocyte subset had a surface phenotype
resembling non-monocytic MDSCs (CD14(-)CD11c(hi)CD123(-)) and exhibited
immunomodulatory roles. Most effector functions of fibrocytes (circulating
fibroblast-progenitors) are accomplished as tissue fibroblasts, likewise in the
tumor microenvironment. Therefore, fibroblasts at tumor tissues should be
evaluated whether they display similar molecular/gene expression patterns and
functional roles to the blood-borne fibrocytes. A chemically induced rat breast
carcinogenesis model was utilized to obtain cancer associated fibroblasts (CAFs).
CAFs and normal tissue fibroblasts (NFs) were isolated from cancerous and healthy
breast tissues, respectively, using a previously described enzymatic protocol.
Both CAFs and NFs were analyzed for cell surface phenotypes by flow cytometry and
for gene expression profiles by gene set enrichment analysis (GSEA). PBMCs were
cocultured with either NFs or CAFs and proliferations of PBMCs were assessed by
CFSE assays. Morphological analyses were performed by immunocytochemistry
stainings with vimentin. CAFs were spindle shaped cells unlike their blood-borne
counterparts. They did not express CD80 and their MHC-II expression was lower
than NFs. Although CAFs expressed the myeloid marker CD11b/c, its expression was
lower than that on the circulating fibrocytes. CAFs did not express
granulocytic/neutrophilic markers and they seemed to have developed in an
environment containing T(HELPER)2-like cytokines. They also showed
immunosuppressive effects similar to their blood-borne counterparts. In summary,
CAFs showed similar phenotypic and functional characteristics to the circulating
fibrocytes that were reported to represent a unique MDSC subset.