Abstract
ApoJ/Clusterin (CLU) is a heterodimeric protein localized in the nucleus, cytoplasm or secretory organelles and involved in cell survival and neoplastic transformation. Its function in human cancer is still highly controversial. In this study, we examined the prostate of mice in which CLU has been genetically inactivated. Surprisingly, we observed transformation of the prostate epithelium in the majority of CLU knockout mice. Either PIN (prostate intraepithelial neoplasia) or differentiated carcinoma was observed in 100 and 87% of mice with homozygous or heterozygous deletion of CLU, respectively. Crossing CLU knockout with TRAMP (prostate cancer prone) mice results in a strong enhancement of metastatic spread. Finally, CLU depletion causes tumourigenesis in female TRAMP mice, which are normally cancer free. Mechanistically, deletion of CLU induces activation of nuclear factor-kB, a potentially oncogenic transcription factor important for the proliferation and survival of prostate cells.
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Acknowledgements
We thank Marina Gardinam for her help with the interpretation of the pathological sections. This work was supported by grants from the Association for International Cancer Research (AICR Grant No. 06-711) to SB and AS; FIL 2008, University of Parma to SB; Sport Aiding Medical Research for Kids (SPARKS) to AS.
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Bettuzzi, S., Davalli, P., Davoli, S. et al. Genetic inactivation of ApoJ/clusterin: effects on prostate tumourigenesis and metastatic spread. Oncogene 28, 4344–4352 (2009). https://doi.org/10.1038/onc.2009.286
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DOI: https://doi.org/10.1038/onc.2009.286
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