Transfection of 3′,3′′-bis-peptide-siRNA conjugate by cationic lipoplexes mixed with a neutral cytosin-1-yl-lipid

doi:10.5246/jcps.2017.10.081

Abstract

Abstract:

Cationic lipids have been applied to siRNA delivery for tumor therapeutics. However, the excess positive charges of these nanoplexes may lead to high cytotoxicity and nonnegligible immunogenicity both in vitro and in vivo, which limited the applications of gene drugs. We constructed multi-component lipoplex to delivery 3′,3′′-bis-peptide-siRNA conjugate (pp-siRNA) by the treatment of melanoma. Based on the previous studies that the gemini lipid (CLD) encapsulated pp-siRNA, a novel neutral cytosin-1-yl-lipid (DNCA) was considered to replace a certain ration of CLD by hydrogen bonds and π-π stacking for reducing the cytotoxicity. It similarly retained in both the loading efficiency and targeted mRNA inhibition when DNCA was accounted for 40% in the lipoplex, with lower toxicity. Moreover, CLD/DNCA/pp-siRNA nanoplex could be uptake in A375 cells and internalized mainly by macropinocytosis and caveolin-mediated endocytosis. Besides, 90%CLD/DNCA/pp-siRNA nanoplexes presented the highest efficient knockdown for the mutant B-RAF mRNA (~80%). All the results demonstrated that the mixed cationic and neutral lipids could efficiently realize the delivery of pp-siRNA and had potential application for cancer therapy.

Key words: 3',3''-Bis-peptide siRNA conjugate, Gemini-like cationic lipid, Cytosin-1-yl-lipid, Melanoma therapy

CLC Number:

R916

Supporting:

Mengyi Yang, Jing Sun, Chao Wang, Yanfen Zhang, Lihe Zhang, Zhenjun Yang. Transfection of 3′,3′′-bis-peptide-siRNA conjugate by cationic lipoplexes mixed with a neutral cytosin-1-yl-lipid[J]. Journal of Chinese Pharmaceutical Sciences, 2017, 26(10): 719-726.

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