Abstract

Objective: Among modern gene therapy methods for combating oncology, suicidal gene therapy based on the delivery of a cytotoxic agent to target cells is of particular importance and promise. As one of such genes, the gene for ribonuclease of Bacillus pumilus 7P, binase, can be considered; the enzyme has a high antitumor potential and low immunogenicity. In addition to the choice of a transgene, another factor influencing the effectiveness of gene therapy is the method of delivering the nucleic acid to target cells. Surfactants have high functional activity and are promising means of delivering therapeutic nucleic acids. The aim of this work was to evaluate the possibility of using geminal surfactants as a means of delivering a genetic construct based on the cytotoxic binase gene into tumor cells. Methods: To optimize the transfection conditions, a reporter genetic construct carrying the binase gene fused to the gene for the green fluorescent protein TurboGFP was created, which made it possible to evaluate the delivery efficiency by the fluorescence intensity. To eliminate the toxic effect of binase on recipient cells, the RNase inhibitor gene, barstar, was introduced into the genetic construct. Results and Discussion: A high complexing ability of geminal surfactants in relation to the reporter system was shown by methods of dynamic light scattering and fluorescence spectroscopy. For surfactant 16-6-16OH, the highest transfecting activity together with a low level of cytotoxicity was found. Conclusions: Thus, the study proved the possibility of using geminal surfactants for the delivery of therapeutic nucleic acids to target cells.