Isolating Murine Primary Oligodendrocytes Using Immunomagnetic Beads

Abstract

Source: Flores-Obando, R. E. et al., Rapid and Specific Immunomagnetic Isolation of Mouse Primary Oligodendrocytes. J. Vis. Exp. (2018).

This video demonstrates a method to isolate primary oligodendrocyte cells from a neural cell suspension obtained from a mouse pup using magnetic separation. The technique employs magnetic beads coated with antibodies specific to oligodendrocyte antigens, enabling selective isolation of these cells.

Protocol

All procedures involving animal models have been reviewed by the local institutional animal care committee and the JoVE veterinary review board.

1. Mouse Brain Cortex Dissociation

1. Sacrifice postnatal 5-7-day old C57Bl/6N mouse pups by quick decapitation with scissors previously cleaned in 70% ethanol.    
   NOTE: Cerebral cortices from 5-6 neonatal mice pups were used for each preparation. On average, one mouse brain yields 1-1.5 x 10⁶ primary oligodendrocytes (Ols).
2. Cut the scalp skin along the midline with small dissecting scissors and re....

Materials

List of materials used in this article

Name	Company	Catalog Number	Comments
10ml serological pipets	Fisher Scientific	13-676-10J
10ml syringe Luer-Loc tip	BD, Becton Dickinson	309604
15ml conical tubes	Falcon	352097
24-well tissue culture plates	Falcon	353935
40µm cell strainer	Fisher Scientific	22368547
50ml conical tubes	Falcon	352098
5ml serological pipets	Fisher Scientific	13-676-10H
60mm tissue culture plates	Falcon	353002
70µm cell strainer	Fisher Scientific	22363548
Anti-O4 beads- Anti-O4MicroBeads	Miltenyi Biotec	130-094-543
Autofil complete bottle top filter assembly, 0.22um filter, 250ml	USA Scientific	6032-1101
Autofil complete bottle top filter assembly, 0.22um filter, 250ml	USA Scientific	6032-1102
B27 Supplement	Invitrogen	17504-044
Bovine Growth Serum (BGS)	GE Healthcare Life Sciences	SH30541.03
BSA	Fisher Scientific	BP-1600-100
CNTF	Peprotech	450-50
Desoxyribonuclease I (DNAse I)	Worthington	LS002007
EDTA	Fisher Scientific	S311
Feather disposable scalpels	Andwin Scientific	EF7281C
Glucose	Fisher Scientific	D16-1
GlutaMAX	Invitrogen	35050-61
Insulin	Invitrogen	12585-014
Magnetic separator stand - MACS multistand	Miltenyi Biotec	130-042-303
Magnetic separator-MiniMACS separator	Miltenyi Biotec	130-042-302
Millex PES 0.22µm filter unit	Millipore	SLG033RS
Neurobasal Medium A	Invitrogen	10888-022
Papain	Worthington	LS003126
PBS without Ca2+ and Mg2+	Sigma	D5652
DNase I stock solution			1. Dissolve at 12,500 U Deoxyribonuclease I / ml in HBSS chilled on ice. 2. Filter sterilize on ice 3. Aliquot at 200 µl and freeze overnight at -20°C. 4. Store aliquots at -20 to -30°C.
Dulbecco's Phosphate Buffered Saline (w/o Ca2+ and Mg2+)			Dissolve pouch in 1 Liter of water to yield 1 liter of medium at 9.6 grams of powder per liter of medium. Store at 2-8 °C.
Trypan Blue Solution	Corning	25-900-CI
B27NBMA			487.75 mL Neurobasal Medium A; 10 mL B27 Supplement; 1 mL Primocin; 1.25 mL Glutamax; Filter sterilize and store at 4 °C until use.
B27NBMA + 10% BGS			27 mL B27NBMA; 3 mL Bovine growth serum
CNTF solution stock (10 µg/ml; 1000X)			Order from Peprotech (450-50). Make up at 0.1 to 1 mg/ml according to Manufacturer's instruction (may vary from lot to lot) in buffer (e.g. DPBS + 0.2% BSA). Store at -80 °C. Working solution (10 µg/ml, 1000X) 1. Make on 0.2% BSA (Fisher scientific BP-1600-100) in DPBS solution and filter sterilize. 2. Dilute master stock aliquot to 10µg/ml in sterile, chilled 0.2% BSA/DPBS. 3. Aliquot (20µl/tube) and snap freeze in liquid nitrogen. 4. Store aliquots at -80 °C.
Magnetic Cell Sorting (MCS) Buffer			Prepare the solution containing phosphate-buffered saline (PBS), pH 7.2, and 0.5% bovine serum albumin (BSA), 0.5 mM EDTA, 5µg/ml Insulin, 1 g/L Glucose. Sterilize and degas by filtration the buffer by passing it through a 0.22 µm Millex filter. Store the buffer at 4°C until use
Hank's balanced salts (HBSS) (Sigma			1. Measure 900 ml of water (temperature 15-20 °C) in a cylinder and stir gently. 2. Add the power and stir until dissolved. 3. Rinse original package with a small amount of water to remove all traces of the powder. 4. Add to the solution in step 2. 5. Add 0.35 gr of sodium bicarbonate (7.5% w/v) for each liter of final volume. 6. Keep stirring until dissolved. 7. Adjust the pH of the buffer while stirring to 0.1-0.3 units below pH= 7.4 since it may rise during filtration. The use of 1N HCl or 1N NaOH is recommended to adjust the pH. 8. Add additional water to bring the final volume to 1L. 9. Sterilize by filtration using a membrane with a porosity of 0.22 microns. 10. Store at 2-8 °C.