Abstract
Conventional plasmids for gene therapy produce low-level and short-term gene expression. Here, we first created minicircle carrying endostatin (mc-hES) for measurement of transfection efficiency. Compared with pcDNA-hES, MC-mediated endostatin gene transfer in vitro resulted in seven-fold greater endostatin expression levels in transfected cells and inhibited the growth of Human umbilical vein endothelial cells (HUVEC) more efficiently. HUVEC cell migration and tube-formation assays suggested that MC-mediated endostatin gene has significant anti-migration and anti-tube-formation capacity than that in pcDNA-hES. In vivo experiments showed that after transfection, mc-hES inhibited the growth of nasopharyngeal carcinoma xenografts. The tumor inhibition rates of mc-hES and pcDNA-hES were 60.8% and 26.9%, respectively (P<0.05). MC-mediated intratumoral endostatin expression in vivo was 2.2–17.9 times higher than pcDNA-hES in xenografted mice and lasted for 20 days. Our results suggest that minicircle DNA vectors might be a promising vector for biotherapy and should be further investigated.
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Acknowledgements
We are most grateful to Dr Zhiying Chen (Stanford University, Stanford, CA), who generously provided p2ϕC31 and advice on this work; we are also grateful to Dr Saiwah Tsao (University of Hong Kong, PR China) who generously provided HUVEC. This work was supported by National Natural Science Foundation of China (Grant No. 81001212 and 30801360), National Basic Research Program of China (973 Program Grant No.2010CB529904 and 2010CB912201), Foundation of Zhejiang Provincial Educational Committee (Grant No. Y201019175) and Zhejiang Provincial Health Bureau Foundation (Grant No. 2010KYB036).
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Xu, BL., Yuan, L., Wu, JX. et al. Mc-hES, a novel plasmid carrying human endostatin gene, inhibits nasopharyngeal carcinoma growth. Cancer Gene Ther 19, 110–117 (2012). https://doi.org/10.1038/cgt.2011.72
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DOI: https://doi.org/10.1038/cgt.2011.72


