Oncogenic KRAS requires complete loss of BAP1 function for development of murine intrahepatic cholangiocarcinoma

Rebecca Marcus, Sammy Ferri-Borgogno, Abdel Hosein, Wai Chin Foo, Bidyut Ghosh, Jun Zhao, Kimal Rajapakshe, James Brugarolas, Anirban Maitra, Sonal Gupta

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Intrahepatic cholangiocarcinoma (ICC) is a primary biliary malignancy that harbors a dismal prognosis. Oncogenic mutations of KRAS and loss-of-function mutations of BRCA1-associated protein 1 (BAP1) have been identified as recurrent somatic alterations in ICC. However, an au-tochthonous genetically engineered mouse model of ICC that genocopies the co-occurrence of these mutations has never been developed. By crossing Albumin-Cre mice bearing conditional alleles of mutant Kras and/or floxed Bap1, Cre-mediated recombination within the liver was induced. Mice with hepatic expression of mutant KrasG12D alone (KA), bi-allelic loss of hepatic Bap1 (BhomoA), and heterozygous loss of Bap1 in conjunction with mutant KrasG12D expression (BhetKA) developed primary hepatocellular carcinoma (HCC), but no discernible ICC. In contrast, mice with homozy-gous loss of Bap1 in conjunction with mutant KrasG12D expression (BhomoKA) developed discrete foci of HCC and ICC. Further, the median survival of BhomoKA mice was significantly shorter at 24 weeks when compared to the median survival of ≥40 weeks in BhetKA mice and approximately 50 weeks in BhomoA and KA mice (p < 0.001). Microarray analysis performed on liver tissue from KA and BhomoKA mice identified differentially expressed genes in the setting of BAP1 loss and suggests that deregulation of ferroptosis might be one mechanism by which loss of BAP1 cooperates with oncogenic Ras in hepato-biliary carcinogenesis. Our autochthonous model provides an in vivo platform to further study this lethal class of neoplasm.

Original languageEnglish (US)
Article number5709
JournalCancers
Volume13
Issue number22
DOIs
StatePublished - Nov 1 2021
Externally publishedYes

Keywords

  • BAP1
  • Ferroptosis
  • Intrahepatic cholangiocarcinoma
  • KRAS
  • Mouse model
  • SLC7A11

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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