MojoSort™ Human anti-PE Nanobeads Protocol

 

Reagent List

Anti-human PE conjugated antibodies MojoSort™ Buffer (5X) (Cat. No. 480017) MojoSort™ Magnet (Cat. No. 480019/480020) or compatible magnetic separation system Adjustable pipettes 70µm filters (one per sample)

5mL (12 x 75mm) or 14mL (17 x 100mm) polypropylene tubes Reagents for sample preparation Reagents and instruments (Flow cytometer) to determine yield and purity

Important Note

MojoSort™ magnetic particles can be used with other commercially available magnetic separators, both free standing magnets and column-based systems. Because MojoSort™ protocols are optimized for the MojoSort™ separator, the protocols may need to be adjusted for other systems. Please contact BioLegend Technical Service (tech@biolegend.com) for more information and guidance. We do not recommend using MojoSort™ particles for BD’s IMag™ or Life Technologies’ DynaMag™.

 

Protocol Steps

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Product description and procedure summary: Target cells are positively selected or depleted by incubating the sample with an anti-human PE conjugated antibody, followed by incubation with magnetic anti-PE Nanobeads. The magnetically labeled fraction is retained by the use of a magnetic separator. These are the PE+ cells, do not discard them if those are the cells of interest. Some of the downstream applications include functional assays, gene expression, phenotypic characterization, etc.

 

Note: This procedure is optimized for the isolation of 10⁷ to 2 x 10⁸ cells per tube. If working with fewer than 10⁷ cells, keep volumes as indicated for 10⁷ cells. For best results, optimize the conditions to your specific cell number and tissue. Prepare fresh MojoSort™ Buffer solution by diluting the 5X concentrate with sterile distilled water. Scale up volumes if using 14mL tubes and Magnet, and place the tube in the magnet for 10 minutes.

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1. Prepare cells from your tissue of interest or blood without lysing erythrocytes. Kits for human samples have been optimized for PBMCs, please prepare the cells using a suitable method.  


2. In the final wash of your sample preparation, resuspend the cells in MojoSort™ Buffer by adding up to 4 mL in a 5 mL (12 x 75 mm) polypropylene tube.
   Note: Keep MojoSort™ Buffer on ice throughout the procedure.  


3. Filter the cells with a 70µm cell strainer, cenrifuge at 300xg for 5 minutes, and resuspend in a small volume of MojoSort™ Buffer. Count and adjust the cell concentration to 1 x 10⁸ cells/mL by adding MojoSort™ Buffer.


4. Aliquot 100µL of cell suspension (10⁷ cells) into a new tube. Add 5µL of Human TruStain FcX™ (Fc Receptor Blocking Solution), mix well and incubate at room temperature for 10 minutes. Scale up the volume accordingly if separating more cells. For example, if the volume of Human TruStain FcX™ for 1x10⁷ cells is 5µL, add 50µL for 1 x 10⁸ cells. When working with less than 10⁷ cells, use indicated volumes for 10⁷ cells.


5. Check the recommended usage for flow cytometric staining of the PE-conjugated antibody indicated in the antibody technical datasheet. Calculate the volume to stain 10⁷ cells (or desired amount of cells). Add the appropriate volume of PE-conjugated antibody to the cell suspension, mix well and incubate on ice for 15 minutes.
   Optional: Take an aliquot before adding the antibody to monitor purity and yield.


6. Wash the cells by adding MojoSort™ Buffer up to 4mL; centrifuge the cells at 300xg for 5 minutes.


7. Discard supernatant and resuspend in 100µL of MojoSort™ Buffer.  


8. Resuspend the beads by vortexing, maximum speed, 5 touches. Add the appropriate volume of Human anti-PE Nanobeads to the cell suspension, mix well and incubate on ice for 15 minutes. The volume of MojoSort™ Human anti-PE Nanobeads should be adjusted depending on starting percentage of cell type to be isolated. For 1x10⁷ cells in 100 µl of buffer, use the following volumes:

 

Cell type	Cell Frequency in PBMCs	Volume of MojoSort™ anti-PE Nanobeads (for 1x107 cells in 100 µl of buffer)
CD3	50-60%	20 µL
CD4 (including monocytes)	50-55%	20 µL
CD8a (including low expressing cells)	15-20%	10 µL
CD19	5-10%	4 µL
TCR Vδ9	1-3%	2 µL

 

For low frequency cells, pre-dilute the Nanobeads in order to pipette a minimum of 5 µL of any solution. For example, to isolate TCR Vγ9+ cells, pre-dilute 10 µL of PE Nanobeads in 40 µL of MojoSort™ buffer and add 10 µL of that dilution per sample. Avoid working with small volumes.

Scale up the volume accordingly if separating more cells. For example, if the volume of Nanobeads for 1x10⁷ cells is 10µL, add 100µL for 1 x 10⁸ cells. When working with less than 10⁷ cells, use indicated volumes for 10⁷ cells.

 

9. Wash the cells by adding MojoSort™ Buffer up to 4mL; centrifuge the cells at 300xg for 5 minutes.


10. Discard the supernatant.  


11. Add 2.5mL of MojoSort™ Buffer.
    Note: If you observe aggregates, filter the suspension. To maximize yield, you can disrupt the aggregates by pipetting the solution up and down.  


12. Place the tube in the magnet for 5 minutes.
    Optional: Take a small aliquot before placing the tube in the magnet to monitor purity and yield. Keep unused cells to be used as control or other applications if needed.


13. Pour out the unlabeled fraction. If these are your cells of interest, DO NOT DISCARD. Resuspend the labeled cells in 2.5mL MojoSort™ Buffer.  


14. Repeat steps 11-13 on the labeled fraction twice more for a total of 3 separations. Pool the unlabeled fractions and keep the labeled cells. The fraction that is not of interest may be useful as staining controls, to monitor purity/yield, or other purposes.
    Optional: Take a small aliquot to monitor purity and yield.  

 

Chart Protocol:

 

 

Application notes: To use this product in magnetic separation columns, a titration of the Nanobeads should be performed. Optimal concentration for magnetic separation columns is lot-specific. Please contact BioLegend Technical Service (tech@biolegend.com) for further assistance on how to use MojoSort™ Nanobeads in magnetic separation columns.