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- Title
Complete In Vivo Reversal of the Multidrug Resistance Phenotype by Jet-injection of Anti-MDR1 Short Hairpin RNA-encoding Plasmid DNA.
- Authors
Stein, Ulrike; Walther, Wolfgang; Stege, Alexandra; Kaszubiak, Alexander; Fichtner, Iduna; Lage, Hermann
- Abstract
Triggering the RNA interference (RNAi) pathway by inducing the expression of short hairpin RNA (shRNA) molecules has become a promising tool for efficient silencing of a given gene in gene therapy applications. In this study, shRNA encoding DNA was utilized to reverse the classical MDR1/P-glycoprotein (MDR1/P-gp)-mediated multidrug resistance (MDR) phenotype in vivo. For the first time, the nonviral jet-injection technology was applied for delivering naked shRNA-vector constructs for direct intratumoral in vivo transfer. The highly efficient anti-MDR1 shRNA expression vectors were applied twice in the human MDR1/P-gp overexpressing MaTu/ADR cancer xenograft-bearing mice, and twice in the corresponding drug-sensitive parental MaTu tumor xenograft bearing mice as well. Two days after anti-MDR1 shRNA vector injection, the expression level of the MDR1 messenger RNA (mRNA) was decreased by more than 90% and the corresponding MDR1/P-gp protein was no longer detectable in the tumors. Two jet-injections of anti-MDR1 shRNA vectors into the tumors, combined with two intravenous (IV) administrations of doxorubicin, were sufficient to achieve complete reversal of the drug-resistant phenotype. The data show that jet-injection delivery of shRNA-expressing vectors is effective in reversing MDR1/P-gp-mediated MDR in vivo, and is therefore a promising strategy for making tumors with an MDR1/Pgp-dependent MDR phenotype revert to a drug-sensitive state.Molecular Therapy (2007) 16 1, 178–186. doi:10.1038/sj.mt.6300304
- Subjects
GENE therapy; GLYCOPROTEINS; XENOGRAFTS; DOXORUBICIN; TUMORS
- Publication
Molecular Therapy, 2008, Vol 16, Issue 1, p178
- ISSN
1525-0016
- Publication type
Article
- DOI
10.1038/sj.mt.6300304