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Research Article

Growth Retardation of Poorly Transfectable Tumor by Multiple Injections of Plasmids Encoding PE40 Based Targeted Toxin Complexed with Polyethylenimine

Author(s): Yuriy Khodarovich*, Darya Rakhmaninova, German Kagarlitskiy, Anastasia Baryshnikova and Sergey Deyev

Volume 20, Issue 4, 2020

Page: [289 - 296] Pages: 8

DOI: 10.2174/1566523220999200817101422

Price: $65

Abstract

Background: One of the approaches to cancer gene therapy relies on tumor transfection with DNA encoding toxins under the control of tumor-specific promoters.

Methods: Here, we used DNA plasmids encoding very potent anti-ERBB2 targeted toxin, driven by the human telomerase promoter or by the ubiquitous CAG promoter (pTERT-ETA and pCAG-ETA) and linear polyethylenimine to target cancer cells.

Results: We showed that the selectivity of cancer cell killing by the pTERT-ETA plasmid is highly dependent upon the method of preparation of DNA-polyethylenimine complexes. After adjustment of complex preparation protocol, cell lines with high activity of telomerase promoter can be selectively killed by transfection with the pTERT-ETA plasmid. We also showed that cells transfected with pTERT-ETA and pCAG-ETA plasmids do not exert any detectable bystander effect in vitro.

Conclusion: Despite this, three intratumoral injections of a plasmid-polyethylenimine complex resulted in substantial growth retardation of a poorly transfectable D2F2/E2 tumor in mice. There were no significant differences in anti-tumor properties between DNA constructs with telomerase or CAG promoters in vivo.

Keywords: Gene therapy, pseudomonas exotoxin A, PE40, targeted therapy, transfection, polyethylenimine.

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