AMMF’s Virtual 2021 European Cholangiocarcinoma Conference

Abstract No 5

KLF5 upregulation is a common event in cholangiocarcinoma, acting as an oncogene and constituting a bad prognostic factor

Rodrigues PM*,1,2 Erice O*,1 Landa-Magdalena A*,1 Paiva NA,1 Fernandez-Barrena MG,2,3 Olaizola P,1 Lapitz A,1 O’Rourke CJ,4 Andersen JB,4 Calvisi DF,5 Azkargorta M,2,6 Elortza F,2,6 Goicoechea I7, Lawrie CH7,8,9, Bujanda L,1,2 Perugorria MJ,1,2 Banales JM1,2,9

1Department of Liver and Gastrointestinal Diseases, Biodonostia Health Research Institute – Donostia University Hospital –, University of the Basque Country (UPV/EHU), San Sebastian, Spain; 2National Institute for the Study of Liver and Gastrointestinal Diseases (CIBERehd, “Instituto de Salud Carlos III”), Spain; 3Division of Hepatology, CIMA-University of Navarra, Pamplona, Spain; 4Biotech Research and Innovation Centre (BRIC), Department of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; Spain; 5Institute of Pathology, Uiversity of Regensburg, Regensburg, Germany; 6Proteomics Platform, CIC bioGUNE, CIBERehd, ProteoRed-ISCIII, Bizkaia Science and Technology Park, Derio, Spain; 7Molecular Oncology group, Biodonostia Research Institute, San Sebastian, Spain; 8Radcliffe Department of Medicine, University of Oxford, UK; 9IKERBASQUE, Basque Foundation for Science, Bilbao, Spain.

*shared first authorship

Corresponding authors:
Pedro M. Rodrigues (pedro.rodrigues@biodonostia.org; +34943006067)
Jesus M. Banales (jesus.banales@biodonostia.org; +34943006067)

Background and Aims

Cholangiocarcinoma (CCA) comprises a heterogeneous group of malignant tumors with poor prognosis. Krüppel-like factors (KLF) are a family of transcription factors involved in large variety of biological processes, including organogenesis, differentiation and cellular homeostasis. Here, we investigated the role of KLF5 in cholangiocarcinogenesis and evaluated the therapeutic potential of its inhibition during CCA tumorigenesis.

Methods

KLF5 expression was determined in human CCA tissues [Copenhagen (n=210), TCGA (n=36), Job (n=78), TIGER-LC (n=90) and San Sebastian cohorts (n=12)] and cell lines. KLF5-/- CCA cells were generated by CRISPR/Cas9. Proteomic analyses were carried out by mass spectrometry and the functional effects of KLF5 genetic ablation or chemical inhibition with ML264 were evaluated in vitro and in vivo.

Results

KLF5 expression was upregulated in human CCA tissues from 5 different patient cohorts compared to surrounding normal liver tissue. High KLF5 levels correlated with lymph node invasion and worse overall survival. In vitro, KLF5 protein and mRNA levels were found upregulated in human CCA cells compared to normal human cholangiocytes. Proteomic analysis of KLF5-/- CCA cells revealed that most of the altered pathways are related with the modulation of cell cycle, proliferation, survival and migration. In agreement, KLF5-/- CCA cells displayed decreased cell proliferation, colony formation and migration while promoting cell cycle arrest at G1/S and apoptosis in vitro, when compared with CCA control cells. Instead, no signs of tumor development were evident after subcutaneous or orthotopic injection in a xenograft animal model of CCA. Likewise, KLF5 inhibition with ML264 hampered CCA cells proliferation and migration in vitro and blocked tumor growth in vivo.

Conclusion

Increased KLF5 is a general event in CCA, contributing to cancer progression by promoting cell survival and proliferation. KLF5 inhibition with ML264 may represent a potential therapeutic strategy for CCA.

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