Disruption of Abi1/Hssh3bp1 expression induces prostatic intraepithelial neoplasia in the conditional Abi1/Hssh3bp1 KO mice Journal Article


Authors: Xiong, X.; Chorzalska, A.; Dubielecka, P. M.; White, J. R.; Vedvyas, Y.; Hedvat, C. V.; Haimovitz-Friedman, A.; Koutcher, J. A.; Reimand, J.; Bader, G. D.; Sawicki, J. A.; Kotula, L.
Article Title: Disruption of Abi1/Hssh3bp1 expression induces prostatic intraepithelial neoplasia in the conditional Abi1/Hssh3bp1 KO mice
Abstract: Prostate cancer is one of the leading causes of cancer-related deaths in the United States and a leading diagnosed non-skin cancer in American men. Genetic mutations underlying prostate tumorigenesis include alterations of tumor suppressor genes. We tested the tumor suppressor hypothesis for ABI1/hSSH3BP1 by searching for gene mutations in primary prostate tumors from patients, and by analyzing the consequences of prostate-specific disruption of the mouse Abi1/Hssh3bp1 ortholog. We sequenced the ABI1/hSSH3BP1 gene and identified recurring mutations in 6 out of 35 prostate tumors. Moreover, complementation and anchorage-independent growth, proliferation, cellular adhesion and xenograft assays using the LNCaP cell line, which contains a loss-of-function Abi1 mutation, and a stably expressed wild-type or mutated ABI gene, were consistent with the tumor suppressor hypothesis. To test the hypothesis further, we disrupted the gene in the mouse prostate by breeding the Abi1 floxed strain with the probasin promoter-driven Cre recombinase strain. Histopathological evaluation of mice indicated development of prostatic intraepithelial neoplasia (PIN) in Abi1/Hssh3bp1 knockout mouse as early as the eighth month, but no progression beyond PIN was observed in mice as old as 12 months. Observed decreased levels of E-cadherin, β-catenin and WAVE2 in mouse prostate suggest abnormal cellular adhesion as the mechanism underlying PIN development owing to Abi1 disruption. Analysis of syngeneic cell lines point to the possibility that upregulation of phospho-Akt underlies the enhanced cellular proliferation phenotype of cells lacking Abi1. This study provides proof-of-concept for the hypothesis that Abi1 downregulation has a role in the development of prostate cancer. © 2012 Macmillan Publishers Limited All rights reserved.
Keywords: prostate cancer; mouse model; hssh3bp1; abi1; gene mutations
Journal Title: Oncogenesis
Volume: 1
Issue: 9
ISSN: 2157-9024
Publisher: Nature Publishing Group  
Date Published: 2012-01-01
Start Page: e26
Language: English
DOI: 10.1038/oncsis.2012.28
PROVIDER: scopus
PMCID: PMC3503296
PUBMED: 23552839
DOI/URL:
Notes: --- - "Export Date: 3 December 2012" - "Source: Scopus"
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  1. Cyrus Hedvat
    126 Hedvat
  2. Jason A Koutcher
    278 Koutcher
  3. Julie R White
    29 White
  4. Gary David Bader
    10 Bader