Establishment and characterization of a Brca1−/−, p53−/− mouse mammary tumor cell line

Lilla Hámori, Gyöngyi Kudlik, Kornélia Szebényi, Nóra Kucsma, Bálint Szeder, Ádám Póti, Ferenc Uher, György Várady, Dávid Szüts, József Tóvári, András Füredi, Gergely Szakács

Research output: Contribution to journalArticle

Abstract

Breast cancer is the most commonly occurring cancer in women and the second most common cancer overall. By the age of 80, the estimated risk for breast cancer for women with germline BRCA1 or BRCA2 mutations is around 80%. Genetically engineered BRCA1-deficient mouse models offer a unique opportunity to study the pathogenesis and therapy of triple negative breast cancer. Here we present a newly established Brca1−/−, p53−/− mouse mammary tumor cell line, designated as CST. CST shows prominent features of BRCA1-mutated triple-negative breast cancers including increased motility, high proliferation rate, genome instability and sensitivity to platinum chemotherapy and PARP inhibitors (olaparib, veliparib, rucaparib and talazoparib). Genomic instability of CST cells was confirmed by whole genome sequencing, which also revealed the presence of COSMIC (Catalogue of Somatic Mutations in Cancer) mutation signatures 3 and 8 associated with homologous recombination (HR) deficiency. In vitro sensitivity of CST cells was tested against 11 chemotherapy agents. Tumors derived from orthotopically injected CST-mCherry cells in FVB-GFP mice showed sensitivity to cisplatin, providing a new model to study the cooperation of BRCA1-KO, mCherry-positive tumor cells and the GFP-expressing stromal compartment in therapy resistance and metastasis formation. In summary, we have established CST cells as a new model recapitulating major characteristics of BRCA1-negative breast cancers.

Original languageEnglish
Article number1185
JournalInternational journal of molecular sciences
Volume21
Issue number4
DOIs
Publication statusPublished - Feb 2 2020

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Keywords

  • BRCA1
  • Breast cancer
  • Cancer cell line
  • Genetically engineered mouse model

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Hámori, L., Kudlik, G., Szebényi, K., Kucsma, N., Szeder, B., Póti, Á., Uher, F., Várady, G., Szüts, D., Tóvári, J., Füredi, A., & Szakács, G. (2020). Establishment and characterization of a Brca1−/−, p53−/− mouse mammary tumor cell line. International journal of molecular sciences, 21(4), [1185]. https://doi.org/10.3390/ijms21041185