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Jet-injection of short hairpin RNA-encoding vectors into tumor cells

Item Type:Article
Title:Jet-injection of short hairpin RNA-encoding vectors into tumor cells
Creators Name:Walther, W., Stein, U. and Lage, H.
Abstract:The use of the RNA interference (RNAi) through the expression of small hairpin RNA (shRNA) is a promising approach for efficient gene silencing for therapeutic applications. In this chapter, we describe the in vivo reversal of the classical MDR1/P-glycoprotein (MDR1/P-gp)-mediated multidrug resistance (MDR) phenotype by shRNA. For local intratumoral delivery of naked shRNA-encoding vector constructs, the nonviral jet-injection was used. This jet-injector system uses compressed air to inject small volumes (5-10 muL) of naked nucleic acid solutions into tumor tissues. Furthermore, the design of the jet-injector allows multiple injections. Under our experimental design, the delivery of plasmid DNA encoding anti-MDR shRNA by jet-injection into human MDR1/P-gp overexpressing MaTu/ADR breast cancer xenografts resulted in a decrease of MDR1 mRNA expression level to more than 90%. Accordingly, the corresponding MDR1/P-gp protein is no longer detectable in the tumors after anti-MDR1 shRNA vector injection. Furthermore, combination of two intratumoral jet-injections of anti-MDR1 shRNA vectors with two intravenous administrations of doxorubicin is sufficient for a complete reversal of the MDR phenotype in association with tumor growth inhibition.
Keywords:Gene Therapy, Nonviral Gene Transfer, Jet-Injection, RNA Interference, Short Hairpin RNA, Multidrug Resistance, Animals, Mice
Source:Methods in Molecular Biology
Publisher:Springer / Humana Press
Page Range:123-139
Official Publication:https://doi.org/10.1007/978-1-60761-657-3_9
PubMed:View item in PubMed

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