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Electroporation-mediated gene transfer system applied to cultured CNS neurons

Electroporation-mediated gene transfer system applied to cultured CNS neurons

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[Brain Slice] Electroporation-mediated gene transfer system applied to cultured CNS neurons


Schematic representation of an electroporation set-up



Schematic representation of an electroporation set-up.

A fragment of the mouse embryonic hippocampus was placed on a Millipore membrane filter and 5µl EP buffer containing 1mg/ml of plasmid DNA was applied onto the tissue.

A tungsten needle was attached to the surface of a droplet.

After application of square pulses the tissue fragment was returned to a petri dish containing ice-cold HBSS solution.

Electroporation-mediated expression of fluorescent proteins in hippocampal neurons.

(a-c) Organ culture of hippocampal tissue fragments three days after electroporation with CAG-eGFP (a), T1X4 -eGFP (b), and ß-actin-eGFP (c) expression constructs.

(d, e) A mature hippocampal neuron maintained 14 days in dissociated culture after electroporation of a ß-actin-eGFP expression construct. Higher magni¢cation view of the region marked by a rectangle in (d) reveals dendritic spines on the surface of dendritic shafts (arrows in e).

(f, g) A hippocampal neuron 7 days after electroporation of 1:1 mixture of T1X4-eGFP and T1X4-mRFP1. Both eGFP fluorescence (f) and mRFP1 fluorescence (g) can be observed in a single cell.

(h) Relative fluorescence intensity of hippocampal tissue fragments after electroporation of eGFP-expression plasmids with four different promoter sequences. The tissue fragments were maintained in culture for 4 days, fixed and observed under a confocal microscope. Fluorescence intensities per unit area of the tissue fragments were determined.

(i) Relative fluorescence intensity of hippocampal tissue fragments isolated at two different developmental stages and electroporated with ß-actin-eGFP. Tissue fragments were maintained for 4 days in culture and subsequently fixed. Fluorescence intensities were measured using a confocal microscope.

Bars = 50µm (a-d, f, g); 10µm (e).

Department of Anatomy and Cell Biology, School of Medicine, Tokyo Medical and Dental University; Shigeo Okabe

*Neuroreport, Volume 15, Issue 6, Pages 971-975, April 29, 2004

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