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• W2012134243 endingPage "1935" @default.
• W2012134243 startingPage "1924" @default.
• W2012134243 abstract "The FOXO family of Forkhead transcription factors, regulated by the phosphoinositide-3-kinase–Akt pathway, is involved in cell cycle regulation and apoptosis. Strong expression of HER2, a receptor tyrosine kinase oncogene, in cancers has been associated with a poor prognosis. Recently, FOXO4 was shown to regulate the transcription of the cyclin-dependent kinase inhibitor p27 Kip1 gene directly. Also, we have shown that HER2 promotes mitogenic growth and transformation of cancer cells by downregulation of p27 Kip1. Given the fact that FOXO4 mediates p27 transcription, we hypothesize that an Akt phosphorylation mutant of FOXO4 (FOXO4A3), which maintains the activity to transactivate p27 Kip1, may be used as an anticancer agent for HER2-overexpressing cancers. Here, we applied the FOXO4 gene as a novel anticancer agent for HER2-overexpressing cells under the control of a tetracycline (tet)-regulated gene expression system. Overexpression of FOXO4A3 inhibits HER2-activated cell growth. We found that FOXO4A3 inhibited the kinase activity of protein kinase B/Akt and reversed HER2-mediated p27 mislocation in the cytoplasm. FOXO4A3 expression also led to decreased levels of CSN5, a protein involved in p27 degradation. These data suggest that FOXO4A3 also can regulate p27 post-transcriptionally. In addition, we found that FOXO4A3 sensitized cells to apoptosis induced by the chemotherapeutic agent 2-methoxyestradiol. Most significantly for clinical application, FOXO4A3 expression in HER2-overexpressing cells can be regulated in vivo and reduces the tumor volume in a tumor model. These findings indicate the applicability of employing FOXO4 regulation as a therapeutic intervention in HER2-overexpressing cancers." @default.
• W2012134243 created "2016-06-24" @default.
• W2012134243 creator A5013437001 @default.
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• W2012134243 date "2005-01-31" @default.
• W2012134243 modified "2023-09-26" @default.
• W2012134243 title "Constitutively active FOXO4 inhibits Akt activity, regulates p27 Kip1 stability, and suppresses HER2-mediated tumorigenicity" @default.
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• W2012134243 doi "https://doi.org/10.1038/sj.onc.1208352" @default.
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