Abstract
During lung development, cells proliferate for a defined length of time before they begin to differentiate. Factors that control this proliferative process and how this growth process is related to lung cancer are currently unknown. Here, we found that the WD40-containing protein (p44/wdr77) was expressed in growing epithelial cells at the early stages of lung development. In contrast, p44/wdr77 expression was diminished in fully differentiated epithelial cells in the adult lung. Loss of p44/wdr77 gene expression led to cell growth arrest and differentiation. Re-expression of p44/wdr77 caused terminally differentiated cells to re-enter the cell cycle. Our findings suggest that p44/wdr77 is essential and sufficient for proliferation of lung epithelial cells. P44/Wdr77 was re-expressed in lung cancer, and silencing p44/wdr77 expression strongly inhibited growth of lung adenocarcinoma cells in tissue culture and abolished growth of lung adenocarcinoma tumor xenografts in mice. The growth arrest induced by loss of p44/wdr77 expression was partially through the p21–Rb signaling. Our results suggest that p44/wdr77 controls cellular proliferation during lung development, and this growth process is reactivated during lung tumorigenesis.
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Acknowledgements
We thank Joe Munch in MD Anderson’s Department of Scientific Publications for editing the manuscript and Shen Gao for performing the experiment as described in Supplementary Figure S1. This work was supported in part by the National Institutes of Health through MD Anderson’s Cancer Center Support Grant CA16672, National Natural Science Foundation of China (81171922) and Key Project Research Fund of Shaanxi Provincial Science and Technology Program, China (2008K27G01). No additional external funding for this study was received. The funding agency had no role in study design, data collection or analysis, decision to publish, or manuscript preparation.
Author contributions: FZ performed orthotopic injection of cells and bioluminescent imaging. ZG performed the other experiments. ZQW, WM and RED performed DNA microarray analysis. ZW wrote the manuscript.
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Gu, Z., Zhang, F., Wang, ZQ. et al. The p44/wdr77-dependent cellular proliferation process during lung development is reactivated in lung cancer. Oncogene 32, 1888–1900 (2013). https://doi.org/10.1038/onc.2012.207
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DOI: https://doi.org/10.1038/onc.2012.207
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