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2016 ; 64
(3
): 828-42
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Chromosome 8p tumor suppressor genes SH2D4A and SORBS3 cooperate to inhibit
interleukin-6 signaling in hepatocellular carcinoma
#MMPMID27311882
Ploeger C
; Waldburger N
; Fraas A
; Goeppert B
; Pusch S
; Breuhahn K
; Wang XW
; Schirmacher P
; Roessler S
Hepatology
2016[Sep]; 64
(3
): 828-42
PMID27311882
show ga
Several chronic inflammatory liver diseases, e.g., chronic hepatitis B or C viral
infection and steatohepatitis, have been shown to predispose to the development
of hepatocellular carcinoma (HCC). In patients with chronic liver disease,
interleukin-6 (IL-6) serum levels are elevated and increase even more when HCC
develops. However, the impact and regulatory mechanisms of IL-6 signaling during
hepatocarcinogenesis are still poorly defined. Here, we show that gene expression
profiles of patients with chromosome 8p loss correlate with increased IL-6
signaling. In addition, the chromosome 8p tumor suppressor genes Src homology 2
domain containing 4A (SH2D4A) and Sorbin and Src homology 3 domain containing 3
(SORBS3) together exerted greater inhibition of cell growth and clonogenicity
compared to a single gene. Overexpression of SH2D4A and SORBS3 in HCC cells led
to decreased IL-6 target gene expression and reduced signal transducer and
activator of transcription 3 (STAT3) signaling. In situ and in vitro
coimmunoprecipitation assays revealed that SH2D4A directly interacts with STAT3,
thereby retaining STAT3 in the cytoplasm and inhibiting STAT3 transcriptional
activity. On the other hand, SORBS3 coactivated estrogen receptor ? signaling,
leading indirectly to repression of STAT3 signaling. In human HCC tissues, SH2D4A
was positively associated with infiltrating regulatory and cytotoxic T-cell
populations, suggesting distinct immunophenotypes in HCC subgroups with
chromosome 8p loss. Thus, the genetically linked tumor suppressors SH2D4A and
SORBS3 functionally cooperate to inhibit STAT3 signaling in HCC. CONCLUSION: The
chromosome 8p tumor suppressor genes SORBS3 and SH2D4A are physically and
functionally linked and provide a molecular mechanism of inhibiting
STAT3-mediated IL-6 signaling in HCC cells. (Hepatology 2016;64:828-842).
|Adaptor Proteins, Signal Transducing/genetics/*metabolism
[MESH]