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2015 ; 4
(10
): e1031440
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Reciprocal control of miR-197 and IL-6/STAT3 pathway reveals miR-197 as potential
therapeutic target for hepatocellular carcinoma
#MMPMID26451302
Wang H
; Su X
; Yang M
; Chen T
; Hou J
; Li N
; Cao X
Oncoimmunology
2015[Oct]; 4
(10
): e1031440
PMID26451302
show ga
Signal transducer and activator of transcription 3 (STAT3) is one of the key
players in liver cancer. Increased levels of phosphorylated STAT3 (p-STAT3) have
been detected in many cancers including hepatocellular carcinoma (HCC), and are
usually associated with a more aggressive phenotype and poor prognosis. In
addition to aberrant activation of STAT3, upregulation of total STAT3 was also
detected in HCC, for which the underlying mechanisms and significance remain to
be fully elucidated. Here we report that a reciprocal regulation exists between
miR-197 and the IL-6/STAT3 inflammatory signaling pathway in HCC. We found that
IL-6 stimulation increased total STAT3 expression at protein level but not mRNA
level in HCC cells, suggesting the existence of post-transcriptional regulation
of STAT3. Our study showed that IL-6/STAT3 pathway decreases expression of
miR-197 in HCC, which amplifies IL-6/STAT3 pathway and contributes to HCC
progression. miR-197 can significantly inhibit HCC growth both in vitro and in
vivo. In addition, IL-6/STAT3-induced downregulation of miR-197 in HCC may be via
affecting Drosha binding to primary miR-197 (pri-miR-197) and thus reducing
mature miR-197 generation. Our study suggests that miR-197 may serve as a
potential therapeutic target for interfering with the IL-6/STAT3 inflammatory
pathway in HCC.