Back to Journals » International Journal of Nanomedicine » Volume 5

The investigation of polymer-siRNA nanoparticle for gene therapy of gastric cancer in vitro

Authors Wu, Wang W, Chen Y, Huang K, Shuai X, Chen Q, Li X, Lian G

Published 5 March 2010 Volume 2010:5 Pages 129—136


Review by Single anonymous peer review

Peer reviewer comments 4

Ying Wu1, Weiwei Wang2, Yinting Chen1, Kaihong Huang1, Xintao Shuai2, Qikui Chen1, Xuexian Li1, Guoda Lian1

1Department of Gastroenterology, The Second Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China; 2BME Center, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, China

Abstract: Small interfering RNA (siRNA) molecules have significant therapeutic promise for the genetic treatment of cancer. To overcome instability and low transfection efficiency, polyethylene glycol-polyethyleneimine (PEG-PEI) was synthesized and investigated as a non-viral carrier of siRNA targeting CD44v6 in gastric carcinoma cells. The size, surface charge using zeta potential, and morphology via scanning electron microscopy (SEM) of PEG-PEI/siRNA nanoparticles was characterized, and their cytotoxicity, transfection efficiency, and interaction with SGC7901 human gastric carcinoma cells was evaluated. The transfection efficiency of PEG-PEI/siRNA nanocomplexes was dependant on the charge ratio between amino groups of PEG-PEI and phosphate groups of siRNA (N/P) values, which reflected the molar ratio of PEG-PEI to siRNA during complex formation. The transfection efficiency of PEG-PEI/siRNA at N/P 15 was 72.53% ± 2.38%, which was higher than that observed using Lipofectamine 2000 and PEI as delivery carriers. Cytotoxicity of PEG-PEI was determined by MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay and was obviously lower than that of PEI. Moreover, when N/P was below 15, PEG-PEI/siRNA was less toxic than Lipofectamine 2000/siRNA. RT-PCR (real time polymerase chain reaction) and Western blot analyses of CD44v6 expression demonstrated the gene silencing effect of PEG-PEI/siRNA at N/P 15. These data indicate that PEG-PEI may be a promising non-viral carrier for altering gene expression in the treatment of gastric cancer with many advantages, such as relatively high gene transfection efficiency and low cytotoxicity.

Keywords: siRNA, PEG-PEI, nanoparticles, CD44v6 gene, gastric carcinoma cells

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.