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Enhanced apoptosis of ovarian cancer cells via nanocarrier-mediated codelivery of siRNA and doxorubicin

Authors Zou S, Cao N, Cheng D, Zheng R, Wang J, Zhu K, Shuai X

Received 19 December 2011

Accepted for publication 3 May 2012

Published 18 July 2012 Volume 2012:7 Pages 3823—3835


Review by Single-blind

Peer reviewer comments 6

Seyin Zou,1,3,† Nuo Cao,1,† Du Cheng,2 Rongqin Zheng,4 Jin Wang,4 Kangshun Zhu,4 Xintao Shuai1,2
1Center of Biomedical Engineering, Zhongshan School of Medicine, 2PCFM Lab of Ministry of Education, School of Chemistry and Chemical Engineering, 3Department of Laboratory Medicine,The Third Affiliated Hospital, Guangzhou Medical University, 4The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China

These authors contributed equally to this work

Abstract: A folate conjugated ternary copolymer, FA–PEG–PEI–PCL, of poly(ethylene glycol) (PEG), poly(ethylene imine) (PEI), and poly(ε-caprolactone) (PCL) was synthesized. The copolymer self-assembled into cationic micelles capable of co-delivering siRNA and the anticancer drug doxorubicin (DOX). This dual functional nanocarrier demonstrated low cytotoxicity and high performance in drug/siRNA delivery. Upon the codelivery of siRNA, targeting the Bcl-2 gene, and DOX, using the folate-targeted nanocarrier, DOX-induced apoptosis in the skov-3 cells overexpressing folate receptor was significantly enhanced through a mechanism of downregulating the antiapoptotic protein Bcl-2, while simultaneously upregulating the proapoptotic protein Bax. This work suggested that the combination of Bcl-2 siRNA and DOX therapies is feasible, based on our dual functional nanocarrier, which set up a good basis for a future in vivo test.

Keywords: codelivery, gene silencing, chemotherapy, apoptosis, tumor targeting

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