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 JoVE Biology

Transfecting Human Neural Stem Cells with the Amaxa Nucleofector

1, 1

1Department of Pathology, University of California, Irvine (UCI)

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    Summary

    Introducing a gene of interest into a cell is a powerful method for elucidating its function in vivo. This protocol describes an efficient method of transfecting a culture of human neural stem/precursor cells (hNSPCs) using the Nucleofector electroporation apparatus made by Amaxa.

    Date Published: 7/19/2007, Issue 6; doi: 10.3791/240

    Cite this Article

    Marchenko, S., Flanagan, L. Transfecting Human Neural Stem Cells with the Amaxa Nucleofector. J. Vis. Exp. (6), e240, doi:10.3791/240 (2007).

    Abstract

    Transfection of primary mammalian neural cells, such as human neural stem/precursor cells (hNSPCs), with commonly used cationic lipid transfection reagents has often resulted in poor cell viability and low transfection efficiency. Other mechanical methods of introducing a gene of interest, such as a “gene gun” or microinjection, are also limited by poor cell viability and low numbers of transfected cells. The strategy of using viral constructs to introduce an exogenous gene into primary cells has been constrained by both the amount of time and labor required to create viral vectors and potential safety concerns. We describe here a step-by-step protocol for transfecting hNSPCs using Amaxa's Nucleofector device and technology with electrical current parameters and buffer solutions specifically optimized for transfecting neural stem cells. Using this protocol, we have achieved initial transfection efficiencies of ~35% and ~70% after stable transfection The protocol entails combining a high number of hNSPCs with the DNA to be transfected in the appropriate buffer followed by electroporation with the Nucleofector device.

    Protocol

    Note: Refer to the Passaging Human Neural Stem Cells article (http://www.jove.com/index/Details.stp?ID=263) and the Counting Human Neural Stem Cells article (http://www.jove.com/index/Details.stp?ID=262) to learn how to resuspend and count hNSPCs.

    Preparation

    1. Make sure that there are plenty of cells available for transfection (several million cells for each DNA to be transfected).
    2. Coat a tissue culture dish, into which the transfected cells will be seeded, with 10 µg/ml human fibronectin the night before transfection. Right before starting the transfection protocol, remove the fibronectin, rinse the dish with PBS, and place culture media in the dish. Leave the dish in the 37°C tissue culture incubator to warm the media. Also, place 1 ml of culture media in the incubator to pre-warm to 37°C.
    3. Place the DNA(s) to be transfected, and transfection solution (from Amaxa), on ice.

    Transfection

    1. Wash a defined number of cells with PBS (we usually use ~ 5 x 106 cells per transfection). Pellet the cells by centrifugation (1000 rpm (~200xg) for 5 minutes), remove as much PBS as possible, and resuspend the cell pellet in 100 µl of the transfection solution provided with the transfection kit. Transfer the cell suspension to a 1.7 ml eppendorf tube.
    2. Add 5 µl of the DNA (~5-10 µg of DNA per transfection) to the cell suspension and mix gently.
    3. Using the Amaxa mini-pipette, transfer the cell-DNA mix into the Amaxa transfection cuvette Make sure you have 1 ml of pre-warmed culture media for the next step. Also, remove the cell dish with culture media from the incubator and place it in the tissue culture hood
    4. Place the cuvette into the Nucleofector, rotate the wheel clockwise, and select program "A-033". Press Enter.
    5. A successful transfection is indicated by the presence of a very dense layer of bubbles on top of the solution in the cuvette. Add 500 µl warm media into the cuvette, and using the Amaxa mini-pipette, transfer the transfected cells into the dish with pre-warmed media. Rinse the cuvette with more warm media and add the rinse to the same dish. Place the dish with cells in the 37°C tissue culture incubator.

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    Discussion

    This protocol describes a relatively rapid and efficient transfection procedure for hNSPCs. Using this procedure, we have obtained initial transfection efficiencies of ~35%. Cells transfected by this procedure can be used for short-term studies (transiently transfected cells) or for longer-term studies if a selection agent is used to generate a stably transfected population. We have generated stably transfected cells in which ~70% of the cells express the exogenous protein. In transiently transfected hNSPCs, we have observed continued expression of the exogenous protein for ~7 days.

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    Disclosures

    Acknowledgements

    The authors would like to acknowledge Dr. Philip H. Schwartz of the National Human Neural Stem Cell Resource at the Children s Hospital, Orange County Research Institute for providing hNSPC cultures.

    Materials

    Name Type Company Catalog Number Comments
    The Nucleofector Device Tool Amaxa AAD-1001
    Mouse neural stem cell nucleofector kit Reagent Amaxa VPG-1004

    References

    1. Gresch O, Engel FB, Nesic D, Tran TT, England HM, Hickman ES, K rner I, Gan L, Chen S, Castro-Obregon S, Hammermann R, Wolf J, M ller-Hartmann H, Nix M, Siebenkotten G, Kraus G, Lun K. New non-viral method for gene transfer into primary cells. Methods 33, 151-163, (2004).

    2. Marchenko, S., Flanagan, L.A. Passaging Human Neural Stem Cells. Journal of Visualized Experiments, (7). http://www.jove.com/index/Details.stp?ID=263 (22 August 2007).

    3. Marchenko, S., Flanagan, L.A. Counting Human Neural Stem Cells. Journal of Visualized Experiments, (7). http://www.jove.com/index/Details.stp?ID=262 (22 August 2007).

    Comments

    4 Comments

    Hi, thank you so much for nice video. please let me know do you use medium contains serum after transfection or normal medium that you use in normal passage of NSC?
    thank you in advance
    Narges
    institute of neurophysiology
    KŒln university
    Germany
    Reply

    Posted by: AnonymousMay 11, 2011, 5:57 AM

    Dear Narges, we never used media with serum in it. We used normal culture medium after transfection. Serum contains a variety of factors that may induce differentiation of human neural stem cells prematurely, so we used serum-free culturing conditions for culturing and for transfection of these cells. For further details regarding the media check out a previous protocol:
    http://www.jove.com/Details.stp?ID=²63#
    Reply

    Posted by: AnonymousMay 14, 2011, 9:15 PM

    Hi!
    have you tried any transfection media different to that of the kit?
    Reply

    Posted by: AnonymousMarch 7, 2012, 9:35 AM

    No, we have only used the provided transfection media.

    - Best of luck!
    Reply

    Posted by: AnonymousMarch 7, 2012, 4:29 PM

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