Transfecting Human Neural Stem Cells with the Amaxa Nucleofector

Published 7/19/2007
4 Comments
  CITE THIS  SHARE 
Biology

You must be subscribed to JoVE to access this content.

Fill out the form below to receive a free trial:

Welcome!

Enter your email below to get your free 10 minute trial to JoVE!





By clicking "Submit," you agree to our policies.

 

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.

Cite this Article

Copy Citation

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.

Subscription Required. Please recommend JoVE to your librarian.

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.

Subscription Required. Please recommend JoVE to your librarian.

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

DOWNLOAD MATERIALS LIST

References

  1. Gresch, O., Engel, F. B., Nesic, D., Tran, T. T., England, H. M., Hickman, E. S., Krner, 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 (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 (2007).

Comments

4 Comments

  1. 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: Anonymous
    May 11, 2011 - 5:57 AM
  2. 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: Anonymous
    May 14, 2011 - 9:15 PM
  3. Hi!
    have you tried any transfection media different to that of the kit?

    Reply
    Posted by: Anonymous
    March 7, 2012 - 9:35 AM
  4. No, we have only used the provided transfection media.

    - Best of luck!

    Reply
    Posted by: Anonymous
    March 7, 2012 - 4:29 PM

Post a Question / Comment / Request

You must be signed in to post a comment. Please or create an account.

Video Stats