癌症研究
生物
胆管上皮细胞
转分化
PTEN公司
肝细胞生长因子
细胞生物学
信号转导
PI3K/AKT/mTOR通路
干细胞
内分泌学
受体
遗传学
作者
Yuto Shiode,Tatsuhiko Kodama,Satoshi Shigeno,Kazuhiro Murai,Satoshi Tanaka,Justin Y. Newberg,Jumpei Kondo,Shogo Kobayashi,Ryotaro Yamada,Hayato Hikita,Ryotaro Sakamori,Hiroshi Suemizu,Tomohide Tatsumi,Hidetoshi Eguchi,Nancy A. Jenkins,Neal G. Copeland,Tetsuo Takehara
出处
期刊:Hepatology
[Wiley]
日期:2022-02-01
卷期号:77 (2): 395-410
被引量:8
摘要
Intrahepatic cholangiocarcinoma (ICC) is a deadly but poorly understood disease, and its treatment options are very limited. The aim of this study was to identify the molecular drivers of ICC and search for therapeutic targets.We performed a Sleeping Beauty transposon-based in vivo insertional mutagenesis screen in liver-specific Pten -deficient mice and identified TNF receptor-related factor 3 ( Traf3 ) as the most significantly mutated gene in murine ICCs in a loss-of-function manner. Liver-specific Traf3 deletion caused marked cholangiocyte overgrowth and spontaneous development of ICC in Pten knockout and KrasG12D mutant mice. Hepatocyte-specific, but not cholangiocyte-specific, Traf3 -deficient and Pten -deficient mice recapitulated these phenotypes. Lineage tracing and single-cell RNA sequencing suggested that these ICCs were derived from hepatocytes through transdifferentiation. TRAF3 and PTEN inhibition induced a transdifferentiation-like phenotype of hepatocyte-lineage cells into proliferative cholangiocytes through NF-κB-inducing kinase (NIK) up-regulation in vitro. Intrahepatic NIK levels were elevated in liver-specific Traf3 -deficient and Pten -deficient mice, and NIK inhibition alleviated cholangiocyte overgrowth. In human ICCs, we identified an inverse correlation between TRAF3 and NIK expression, with low TRAF3 or high NIK expression associated with poor prognosis. Finally, we showed that NIK inhibition by a small molecule inhibitor or gene silencing suppressed the growth of multiple human ICC cells in vitro and ICC xenografts in vivo.TRAF3 inactivation promotes ICC development through NIK-mediated hepatocyte transdifferentiation. The oncogenic TRAF3-NIK axis may be a potential therapeutic target for ICC.
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