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Reductive nanocomplex encapsulation of cRGD-siRNA conjugates for enhanced targeting to cancer cells

Authors Zhou Z, Liu S, Zhang Y, Yang X, Ma Y, Guan Z, Wu Y, Zhang L, Yang ZJ

Received 11 March 2017

Accepted for publication 13 June 2017

Published 4 October 2017 Volume 2017:12 Pages 7255—7272


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Linlin Sun

Zhaoxiu Zhou,* Shuang Liu,* Yanfen Zhang, Xiantao Yang, Yuan Ma, Zhu Guan, Yun Wu, Lihe Zhang, Zhenjun Yang

State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, People’s Republic of China

*These authors contributed equally to this work

Abstract: In this study, through covalent conjugation and lipid material entrapment, a combined modification strategy was established for effective delivery of small interfering RNA (siRNA). Single strands of siRNA targeting to BRAFV600E gene (siMB3) conjugated with cRGD peptide at 3'-terminus or 5'-terminus via cleavable disulfide bond was synthesized and then annealed with corresponding strands to obtain single and bis-cRGD-siRNA conjugates. A cationic lipid material (CLD) developed by our laboratory was mixed with the conjugates to generate nanocomplexes; their uniformity and electrical property were revealed by particle size and zeta potential measurement. Compared with CLD/siBraf, CLD/cRGD-siBraf achieved higher cell uptake and more excellent tumor-targeting ability, especially 21 (sense-5′/antisense-3″-cRGD-congjugate) nanocomplex. Moreover, they can regulate multiple pathways to varying degree and reduce acidification of endosome. Compared with the gene silencing of different conjugates, single or bis-cRGD-conjugated siRNA showed little differences except 22 (5/5) which cRGD was conjugated at 5'-terminus of antisense strand and sense strand. However bis-cRGD conjugate 21 nanocomplex exhibited better specific target gene silencing at multiple time points. Furthermore, the serum stabilities of the bis-cRGD conjugates were higher than those of the single-cRGD conjugates. In conclusion, all these data suggested that CLD/bis-conjugates, especially CLD/21, can be an effective system for delivery of siRNA to target BRAFV600E gene for therapy of melanoma.

Keywords: cRGD-siRNA conjugates, cationic lipids, targeting, silencing, intracellular pathways, CLD

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