Endogenous Leu332Gln mutation in p53 disrupts the tetramerization ability in a canine mammary gland tumor cell line

Ochiai,Kazuhiko; Azakami,Daigo; Morimatsu,Masami; Hirama,Hinako; Kawakami,Shota; Nakagawa,Takayuki; Michishita,Masaki; Egusa,Ai S.; Sasaki,Takanori; Watanabe,Masami; Omi,Toshinori

doi:10.3892/or.2018.6409

Endogenous Leu332Gln mutation in p53 disrupts the tetramerization ability in a canine mammary gland tumor cell line

Authors:
- Kazuhiko Ochiai
- Daigo Azakami
- Masami Morimatsu
- Hinako Hirama
- Shota Kawakami
- Takayuki Nakagawa
- Masaki Michishita
- Ai S. Egusa
- Takanori Sasaki
- Masami Watanabe
- Toshinori Omi
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Affiliations: School of Veterinary Nursing and Technology, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, Tokyo 180-8602, Japan, Laboratory of Laboratory Animal Science and Medicine, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan, Department of Veterinary Surgery, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan, Department of Veterinary Pathology, Faculty of Veterinary Science, Nippon Veterinary and Life Science University, Tokyo 180-8602, Japan, Department of Applied Life Science, Faculty of Food Science, Nippon Veterinary and Life Science University, Tokyo 180-8602, Japan, Department of Urology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama 700-8558, Japan
Published online on: May 2, 2018 https://doi.org/10.3892/or.2018.6409
Pages: 488-494

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Abstract

Mutations in the p53 gene are associated with more than half of all human cancers. These mutations often cause a disruption of the tumor-suppressor function of p53 and induce genomic instabilities. Wild‑type p53 requires tetramerization to function as an initiator of cell cycle arrest and apoptosis. Although alterations in p53 tetramerization caused by mutation have been well studied, there are few cell lines containing an endogenous mutation in the tetramerization domain of p53. Here, we report the discovery of a canine mammary gland tumor cell line CTB‑m2, which contains the Leu332Gln (L332Q) mutation corresponding to Leu344 in the tetramerization domain of human p53. Although CTB‑m2 cells are genetically heterozygous for the Leu332Gln mutation, the mutant mRNA was almost exclusively expressed. CTB‑m2 cells showed enhanced cell proliferation compared to wild‑type p53-expressing CTB‑m cells of the same lineage. A p53 tetramerization reporter assay showed that the ability of the p53 mutant to form tetramers was significantly lower than that of wild‑type p53. An immunoblot analysis of cross-linked p53 oligomerized forms demonstrated that the L332Q mutant lacked the ability to form tetramers but retained the ability to form dimers. These data suggest that the p53 mutant cell line CTB‑m2 could be a useful tool for analyzing the precise tetramerization mechanisms of p53 and verifying the effects of therapeutic agents against tumors expressing p53 mutants that lack the ability to tetramerize.

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