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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 Int+J+Cancer
2016 ; 138
(8
): 1971-81
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CD90(+) stromal cells are the major source of IL-6, which supports cancer
stem-like cells and inflammation in colorectal cancer
#MMPMID26595254
Huynh PT
; Beswick EJ
; Coronado YA
; Johnson P
; O'Connell MR
; Watts T
; Singh P
; Qiu S
; Morris K
; Powell DW
; Pinchuk IV
Int J Cancer
2016[Apr]; 138
(8
): 1971-81
PMID26595254
show ga
IL-6 is a pleiotropic cytokine increased in CRC and known to directly promote
tumor growth. Colonic myofibroblasts/fibroblasts (CMFs or stromal cells) are
CD90(+) innate immune cells representing up to 30% of normal colonic mucosal
lamina propria cells. They are expanded in CRC tumor stroma, where they also
known as a cancer associated fibroblasts (CAFs). Cells of mesenchymal origin,
such as normal myofibroblasts/fibroblasts, are known to secrete IL-6; however,
their contribution to the increase in IL-6 in CRC and to tumor-promoting
inflammation is not well defined. Using in situ, ex vivo and coculture analyses
we have demonstrated that the number of IL-6 producing CMFs is increased in CRC
(C-CMFs) and they represent the major source of IL-6 in T2-T3 CRC tumors.
Activity/expression of stem cell markers-aldehyde dehydrogenase and LGR5- was
significantly up-regulated in colon cancer cells (SW480, Caco-2 or HT29) cultured
in the presence of conditioned medium from tumor isolated C-CMFs in an IL-6
dependent manner. C-CMF and its derived condition medium, but not normal CMF
isolated from syngeneic normal colons, induced differentiation of tumor promoting
inflammatory T helper 17 cells (Th17) cell responses in an IL-6 dependent manner.
Our study suggests that CD90(+) fibroblasts/myofibroblasts may be the major
source of IL-6 in T2-T3 CRC tumors, which supports the stemness of tumor cells
and induces an immune adaptive inflammatory response (a.k.a. Th17) favoring tumor
growth. Taken together our data supports the notion that IL-6 producing CAFs
(a.k.a. C-CMFs) may provide a useful target for treating or preventing CRCs.