Abstract
The cyclin-dependent kinase (cdk) inhibitor p27 preferentially inactivates cdk complexes required for progression through the G1/S transition. Loss of p27 is associated with aggressive behavior in a variety of tumors, including Barrett's associated adenocarcinoma (BAA). We have previously shown that gastroduodenal–esophageal reflux (GDER) together with N-methyl-N-benzylnitrosamine (MBN) induces Barrett's esophagus (BE) and malignant transformation of the esophageal mucosa in mice. This process is enhanced in a p27 null background. Here, we show that chronic flavopiridol administration sharply reduced the prevalence of BE in GDER/MBN-treated p27 knockout mice when compared to animals treated with diluent only (7 vs 26%, P=0.0079). Similarly, flavopiridol reduced the prevalence of BAA (11 vs 32%, P=0.0098) and overall cancer prevalence (15 vs 60%, P<0.0001). In addition, appropriate molecular targeting by flavopiridol in tumor cells was confirmed by downregulation of cyclin D1, a known target of this pan-cdk inhibitor. The results of this study represent the experimental basis for chemoprevention with cdk inhibitors in human BE and BAA.
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Acknowledgements
This work was supported by the Thelma and Jerry Stergios Thoracic Surgery Education and Research Fund (to FHE), an award from the Dana-Farber Cancer Institute Tisch Family Fund for Research in Solid Tumors (to ML and GIS), and by NIH/NCI Grants RO1 CA90687 (GIS), PO1 CA89021 (ML), and SPORE Grants P50 CA90381 (ML) and P20 CA90578 (GIS and ML). We thank GJ Heatley and J Manola for statistical analysis of the data.
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Lechpammer, M., Xu, X., Ellis, F. et al. Flavopiridol reduces malignant transformation of the esophageal mucosa in p27 knockout mice. Oncogene 24, 1683–1688 (2005). https://doi.org/10.1038/sj.onc.1208375
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DOI: https://doi.org/10.1038/sj.onc.1208375
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