Author/Editor		Reberšek, Matej; Kandušer, Maša; Miklavčič, Damijan
Title		Pipette tip with integrated electrodes for gene electrotransfer of cells in suspension: a feasibility study in CHO cells
Translated title		Koničasta komora z vgrajenimi elektrodami za gensko elektrotransfekcijo celic v suspenziji: raziskava izvedljivosti v CHO celicah
Type		članek
Source		Radiol Oncol
Vol. and No.		Letnik 45, št. 3
Publication year		2011
Volume		str. 204-8
Language		eng
Abstract		Background. Gene electrotransfer is a non-viral gene delivery method that requires successful electroporation for DNA delivery into the cells. Changing the direction of the electric field during the pulse application improves the efficacy of gene delivery. In our study, we tested a pipette tip with integrated electrodes that enables changing the direction of the electric field for electroporation of cell suspension for gene electrotransfer. Materials and methods. A new pipette tip consists of four cylindrical rod electrodes that allow the application of electric pulses in different electric field directions. The experiments were performed on cell suspension of CHO cells in phosphate buffer. Plasmid DNA encoding for green fluorescent protein (GFP) was used and the efficiency of gene electrotransfer was determined by counting cells expressing GFP 24 h after the experiment. Results. Experimental results showed that the percentage of cells expressing GFP increased when the electric field orientation was changed during the application. The GFP expression was almost two times higher when the pulses were applied in orthogonal directions in comparison with single direction, while cell viability was not significantly affected. Conclusions. We can conclude that results obtained with the described pipette tip are comparable to previously published results on gene electrotransfer using similar electrode geometry and electric pulse parameters. The tested pipette tip, however, allows work with small volumes/samples and requires less cell manipulation. Key words: electrodes; gene electrotransfer; pipette tip, CHO cell line
Descriptors		CHO CELLS GENE TRANSFER ELECTROPORATION PLASMIDS