Underexpression of LKB1 tumor suppressor is associated with enhanced Wnt signaling and malignant characteristics of human intrahepatic cholangiocarcinoma

Oncotarget. 2015 Aug 7;6(22):18905-20. doi: 10.18632/oncotarget.4305.


Intrahepatic cholangiocarcinoma (ICC) is a rare and highly aggressive malignancy. In this study, we identified the presence of gene deletion and missense mutation leading to inactivation or underexpression of liver kinase B1 (LKB1) tumor suppressor and excluded the involvement of LKB1 gene hypermethylation in ICC tissues. Immunohistochemical analysis showed that LKB1 was underexpressed in a portion of 326 ICC tissues compared to their adjacent normal tissues. By statistical analysis underexpression of LKB1 in ICC tissues significantly correlated with poor survival and malignant disease characteristics in ICC patients. Moreover, we showed that knockdown of LKB1 significantly enhanced growth, migration, and invasion of three LKB1-competent ICC cell lines. Global transcriptional profiling analysis identified multiple malignancy-promoting genes, such as HIF-1α, CD24, Talin1, Vinculin, Wnt5, and signaling pathways including Hedgehog, Wnt/β-catenin, and cell adhesion as novel targets of LKB1 underexpression in ICC cells. Furthermore, knockdown of LKB1 gene expression dramatically enhanced Wnt/β-catenin signaling in ICC cells, while an inverse correlation between LKB1 and nuclear β-catenin was observed in ICC tissues. Our findings suggest a novel mechanism for ICC carcinogenesis in which LKB1 underexpression enhances multiple signaling pathways including Wnt/β-catenin to promote disease progression.

Keywords: Wnt/β-catenin; global transcriptional profiling; intrahepatic cholangiocarcinoma (ICC); liver kinase B1 (LKB1); recurrence and metastasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • AMP-Activated Protein Kinase Kinases
  • Base Sequence
  • Bile Duct Neoplasms / enzymology
  • Bile Duct Neoplasms / genetics
  • Bile Duct Neoplasms / metabolism*
  • Bile Duct Neoplasms / pathology*
  • Cell Growth Processes / physiology
  • Cell Line, Tumor
  • Cell Movement / physiology
  • Cholangiocarcinoma / enzymology
  • Cholangiocarcinoma / genetics
  • Cholangiocarcinoma / metabolism*
  • Cholangiocarcinoma / pathology*
  • DNA Methylation
  • Down-Regulation
  • Female
  • Gene Knockdown Techniques
  • Genes, Tumor Suppressor
  • Humans
  • Male
  • Middle Aged
  • Molecular Sequence Data
  • Protein Serine-Threonine Kinases / biosynthesis*
  • Protein Serine-Threonine Kinases / metabolism
  • Wnt Signaling Pathway*
  • beta Catenin / metabolism


  • CTNNB1 protein, human
  • beta Catenin
  • Protein Serine-Threonine Kinases
  • STK11 protein, human
  • AMP-Activated Protein Kinase Kinases