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2016 ; 44
(4
): 913-923
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gab.com Text
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CD5 Binds to Interleukin-6 and Induces a Feed-Forward Loop with the Transcription
Factor STAT3 in B Cells to Promote Cancer
#MMPMID27096320
Zhang C
; Xin H
; Zhang W
; Yazaki PJ
; Zhang Z
; Le K
; Li W
; Lee H
; Kwak L
; Forman S
; Jove R
; Yu H
Immunity
2016[Apr]; 44
(4
): 913-923
PMID27096320
show ga
The participation of a specific subset of B cells and how they are regulated in
cancer is unclear. Here, we demonstrate that the proportion of CD5(+) relative to
interleukin-6 receptor ? (IL-6R?)-expressing B cells was greatly increased in
tumors. CD5(+) B cells responded to IL-6 in the absence of IL-6R?. IL-6 directly
bound to CD5, leading to activation of the transcription factor STAT3 via gp130
and its downstream kinase JAK2. STAT3 upregulated CD5 expression, thereby forming
a feed-forward loop in the B cells. In mouse tumor models, CD5(+) but not CD5(-)
B cells promoted tumor growth. CD5(+) B cells also showed activation of STAT3 in
multiple types of human tumor tissues. Thus, our findings demonstrate a critical
role of CD5(+) B cells in promoting cancer.