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High efficiency, Site-specific Transfection of Adherent Cells with siRNA Using Microelectrode Arrays MEA
Published on: September 13, 2012
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Imaging of Electrotransferred siRNA
Muriel Golzio1,2, Justin Teissié3,4
1IPBS (Institut de Pharmacologie et de Biologie Structurale), CNRS, BP 64182, 205 route de Narbonne, 31077, Toulouse, France.
Methods in Molecular Biology (Clifton, N.J.)
|November 5, 2015
Summary
Electroporation delivers small interfering RNA (siRNA) directly into the cell cytoplasm using electric pulses. This method ensures rapid uptake during the pulse, with no further transfer observed after. The siRNA remains confined to the cytoplasm, not entering the nucleus.
Area of Science:
- Cell biology
- Molecular biology
- Biophysics
Background:
- Efficient delivery of nucleic acids like small interfering RNA (siRNA) into cells is crucial for gene silencing applications.
- Electroporation is a known method for enhancing cell membrane permeability.
Purpose of the Study:
- To investigate the precise pathway and kinetics of siRNA uptake into cells following electroporation.
- To visualize the intracellular localization and diffusion of siRNA post-electroporation.
Main Methods:
- Utilizing time-lapse confocal fluorescence microscopy to track siRNA movement within living cells.
- Applying calibrated electric field pulses to a mixture of cells and fluorescently labeled siRNA.
Main Results:
- siRNA is directly translocated to the cytoplasm during the electric field pulse via electrophoresis.
- No significant siRNA transfer into cells was observed after the electric pulse concluded.
- The delivered siRNA molecules diffused freely within the cytoplasm.
- siRNA did not exhibit any detectable access to the cell nucleus.
Conclusions:
- Electroporation provides a direct and immediate route for siRNA delivery into the cytoplasm.
- The intracellular fate of electroporated siRNA is confined to cytoplasmic diffusion, without nuclear entry.
- This targeted cytoplasmic delivery mechanism is effective for gene silencing strategies requiring nuclear exclusion.
