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The Down-regulation of LINE-1 Encoded ORF-1p Impacts the Characters of A549 Cells |
GAO Xu-dong,HU Ming-ming,ZHU Yun-feng |
Department of Oncology, Affiliated Hospital, Academy of Military Medical Sciences, Beijing 100071,China |
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Abstract Objective: To investigate the mechanism of LINE-1 encoded ORF-1p in the tumorigenesis of lung cancer. Methods: The down-regulation of ORF-1p was conducted by RNAi approach and the features of transfected A549 cells were characterized by the approaches of MTT,flow cytometry and soft-agar anchored colony formation. Results: With the constructs of recombinant plasmids, LINE-1 encoded ORF-1p was down-regulated significantly in transfected A549 cells. The characters of transfected A549 cells were appeared to change as follows: Cell proliferation was significantly reduced, which was probably attributed to up-regulation of p21 and p15; cell cycle exhibited S phase arrest (P<0.05); colony formation was significantly attenuated. Conclusion: The down-regulation of ORF-1p can attenuated the A549 characters significantly upon its tumor formation ability.
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Received: 08 February 2010
Published: 12 June 2010
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