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Gene delivery into ischemic myocardium by double-targeted lipoplexes with anti-myosin antibody and TAT peptide

Gene Therapy volume 16, pages 52–59 (2009)Cite this article

Abstract

The treatment of myocardial ischemia using gene therapy is a rather novel but promising approach. Gene delivery to target cells may be enhanced by using double-targeted delivery systems simultaneously capable of extracellular accumulation and intracellular penetration. With this in mind, we have used low cationic liposomes–plasmid DNA complexes (lipoplexes) modified with cell-penetrating transactivating transcriptional activator (TAT) peptide (TATp) and/or with monoclonal anti-myosin monoclonal antibody 2G4 (mAb 2G4) specific toward cardiac myosin, for targeted gene delivery to ischemic myocardium. In vitro transfection of both normoxic and hypoxic cardiomyocytes was enhanced by the presence of TATp as determined by fluorescence microscopy and ELISA. The in vitro transfection was further enhanced by the additional modification with mAb 2G4 antibody in the case of hypoxic, but not normoxic cardiomyocytes. However, we did not observe a synergism between TATp and mAb 2G4 ligands under our experimental condition. In in vivo experiments, we have clearly demonstrated an increased accumulation of mAb 2G4-modified TATp lipoplexes in the ischemic rat myocardium and significantly enhanced transfection of cardiomyocytes in the ischemic zone. Thus, the genetic transformation of normoxic and hypoxic cardiomyocytes can be enhanced by using lipoplexes modified with TATp and/or mAb 2G4. Such complexes also demonstrate an increased accumulation in the ischemic myocardium and effective transfection of hypoxic cardiomyocytes in vivo.

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Acknowledgements

This research study was supported by the NIH grant RO1 HL55519 to VPT.

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  1. Department of Pharmaceutical Sciences, Center for Pharmaceutical Biotechnology and Nanomedicine, Northeastern University, Boston, MA, USA

    Y T Ko, W C Hartner, A Kale & V P Torchilin

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  1. Y T Ko
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Correspondence to V P Torchilin.

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Ko, Y., Hartner, W., Kale, A. et al. Gene delivery into ischemic myocardium by double-targeted lipoplexes with anti-myosin antibody and TAT peptide. Gene Ther 16, 52–59 (2009). https://doi.org/10.1038/gt.2008.135

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