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2016 ; 7
(42
): 68303-68313
Nephropedia Template TP
gab.com Text
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English Wikipedia
CD74 interacts with CD44 and enhances tumorigenesis and metastasis via
RHOA-mediated cofilin phosphorylation in human breast cancer cells
#MMPMID27626171
Liu Z
; Chu S
; Yao S
; Li Y
; Fan S
; Sun X
; Su L
; Liu X
Oncotarget
2016[Oct]; 7
(42
): 68303-68313
PMID27626171
show ga
CD74, also known as Ii, was initially considered to participate primarily in
antigen presentation. Subsequent studies have shown that CD74 is highly expressed
in various types of tumor cells and has multiple roles in a variety of biological
processes. CD74 is thought to promote breast cancer metastasis, but the molecular
mechanism remains elusive. In the present study, our results showed that CD74 was
more highly expressed on the membrane and in the cytoplasm of breast cancer
tissues than in control breast tissues. Consistently, CD74 downregulation reduced
MDA-MB-231 cell invasion and migration and suppressed protrusions in breast
cancer cells. Moreover, CD74 overexpression promoted the phosphorylation of the
actin-severing protein cofilin (CFL1), resulting in actin polymerization in
breast cancer cells. CD44 was required for the up-regulation of CFL1
phosphorylation by CD74 because CD44 knockdown downregulated CD74-induced CFL1
phosphorylation, while CD74 overexpression could not rescue CFL1 phosphorylation.
Moreover, RHOA is necessary for CFL1 phosphorylation and cell migration induced
by CD74 in breast cancer cells. Our findings highlight the critical role of CD74
in breast cancer metastasis. New drugs and antibodies targeting CD74 may be
effective strategies for breast cancer therapy.