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As a global market leader with numerous subsidiaries and distributors, Miltenyi Biotec is committed to providing our customers around the world with the highest quality products. In addition to direct selling in more than 20 countries in North America, Europe and Asia/Pacific, Miltenyi Biotec also provides support for our customers through an extensive distributor network covering dozens of additional countries.
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This application protocol describes the step-by-step dissociation of PSC-derived cerebral organoids into single cells, using the Neural Tissue Dissociation Kit (P) or (T) in combination with the gentleMACS™ Dissociator. After dissociation, single cells can be either analyzed by flow cytometry using the MACSQuant® Analyzer 10 or can be cultivated for immunostaining and microscopy analysis.
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Notes:
Preparation of the enzyme mixes using Neural Tissue Dissociation Kit (T) or (P)
Enzyme T and Enzyme P of the Neural Tissue Dissociation Kit (NTDK) are ready to use. Prepare aliquots of appropriate volume to avoid repeated freeze-thaw-cycles. Store aliquots at –20 °C. This solution is stable for 6 months. Resuspend the lyophilized powder in the vial labeled Enzyme A with 1 mL Buffer A. Do not vortex. This solution should be aliquoted and stored at –20 °C for later use. Avoid repeated freeze-thaw-cycles.
Table 1: Enzyme mixes
Enzyme mix 1 | Enzyme mix 2 | |||
NTDK (P) | Enzyme P | Buffer X | Buffer Y | Enzyme A |
50 µL | 1900 µL | 20 µL | 10 µL | |
NTDK (T) | Enzyme T | Buffer X | Buffer Y | Enzyme A |
200 µL | 1750 µL | 20 µL | 10 µL |
Preparation of stop solution
Prepare a solution of Dulbecco′s Modified Eagle′s Medium (DMEM) containing 20% fetal calf serum.
Staining buffer
Prepare a solution containing phosphate-buffered saline (PBS), pH 7.2, 0.5% bovine serum albumin (BSA), and 2 mM EDTA by diluting MACS® BSA Stock Solution 1:20 with autoMACS® Rinsing Solution. Keep buffer cold (2−8 °C).
Fixation/Permeabilization Solution
To achieve the appropriate working concentration for safe fixation and permeabilization of cells, the Fixation/Permeabilization Solution 1 (component of FoxP3 Staining Buffer Set) must be diluted 1:4 with the Fixation/Permeabilization Solution 2 (component of FoxP3 Staining Buffer Set) (i.e. for 10⁶ cells use 0.25 mL of Fixation/Permeabilization Solution 1 plus 0.75 mL of Fixation/Permeabilization Solution 2).
Permeabilization Buffer
To achieve the appropriate working concentration for safe permeabilization of cells, the 10× Permeabilization Buffer (component of FoxP3 Staining Buffer Set) must be diluted 1:10 with deionized or distilled water before use (i.e. 1 mL of 10× Permeabilization Buffer plus 9 mL of deionized/distilled water).
Poly-L-lysine coating of Imaging Plate CG 1.0 (24 well)
Add 500 µL Poly-L-lysine per well and incubate the plate at 37 °C overnight. Discard the Poly-L-lysine directly before plating of cells.
Culture medium
Prepare the culture medium by adding 2% MACS® NeuroBrew®-21, 1% penicillin/streptomycin and 0.5 mM L-glutamine to the MACS Neuro Medium.
Blocking solution
Prepare a solution containing 1% Triton X 100 and 10% fetal calf serum in D-PBS without calcium and magnesium.
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Unless otherwise specifically indicated, Miltenyi Biotec products and services are for research use only and not for therapeutic or diagnostic use.
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