Skip to Main content Skip to Navigation
Journal articles

SOX9 expression decreases survival of patients with intrahepatic cholangiocarcinoma by conferring chemoresistance

Abstract : BACKGROUND:Sex-determining region Y-box (SRY-box) containing gene 9 (SOX9) expression confers cancer stem cell features. However, SOX9 function in intrahepatic cholangiocarcinoma (iCCA) is unknown. This study investigated the effects and underlying mechanisms of SOX9 in iCCA.METHODS:SOX9 expression in 59 iCCA patients was examined by immunohistochemistry. The association between SOX9 expression and clinical outcome was evaluated. Gene signature and biological functions of SOX9 in iCCA were examined in vitro.RESULTS:iCCA patients with high SOX9 expression had shorter survival time than those with low SOX9. In patients receiving chemotherapy, median survival time in patients with low and high levels of SOX9 were 62 and 22 months, respectively. In vitro, gemcitabine increased SOX9 expression in iCCA cells. When SOX9 was knocked down, gemcitabine-induced apoptosis was markedly increased. Silencing SOX9 significantly inhibited gemcitabine-induced phosphorylation of checkpoint kinase 1, a key cell cycle checkpoint protein that coordinates the DNA damage response and inhibited the expression of multidrug resistance genes. Microarray analyses showed that SOX9 knockdown in CCA cells altered gene signatures associated with multidrug resistance and p53 signalling.CONCLUSIONS:SOX9 governs the response of CCA cells to chemotherapy. SOX9 is a biomarker to select iCCA patients eligible for efficient chemotherapy.
Document type :
Journal articles
Complete list of metadata

Cited literature [37 references]  Display  Hide  Download
Contributor : Laurent Jonchère <>
Submitted on : Tuesday, December 4, 2018 - 9:52:01 AM
Last modification on : Tuesday, May 25, 2021 - 9:30:02 AM
Long-term archiving on: : Tuesday, March 5, 2019 - 1:37:10 PM


Yuan_SOX9 expression decreases...
Files produced by the author(s)



Xiaodong Yuan, Jun Li, Cédric Coulouarn, Tao Lin, Laurent Sulpice, et al.. SOX9 expression decreases survival of patients with intrahepatic cholangiocarcinoma by conferring chemoresistance. Breast Cancer Research and Treatment, Springer Verlag, 2018, 119 (11), pp.1358-1366. ⟨10.1038/s41416-018-0338-9⟩. ⟨hal-01937262⟩



Record views


Files downloads