Method Article

Snelle en specifieke Immunomagnetic isolatie van de primaire oligodendrocyten muis

DOI:

10.3791/57543

May 21st, 2018

In This Article

Summary

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We beschrijven de immunomagnetic isolatie van primaire muisknop oligodendrocyten, waarmee het snelle en specifieke isolement van de cellen voor in vitro cultuur.

Abstract

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De efficiënte en robuuste isolatie en de cultuur van primaire oligodendrocyten (OLs) is een waardevol instrument voor het in vitro onderzoek naar de ontwikkeling van oligodendroglia, alsook de biologie van demyeliniserende ziekten zoals multiple sclerose en Pelizaeus-Merzbacher-achtige ziekte (PMLD). Hier presenteren we een eenvoudige en efficiënte selectiemethode voor de isolatie van de immunomagnetic van fase drie O4+ preoligodendrocytes cellen van neonatale muizen pups. Aangezien onvolwassen OL vormen meer dan 80% van de knaagdier-hersenen witte stof op postnatale dag 7 (P7) deze methode isolatie zorgt niet alleen voor hoge cellulaire opbrengst, maar ook de specifieke Isolatievan OLs al toegezegd om de oligodendroglial afstamming, daalt het mogelijkheid van het isoleren van contaminerende cellen zoals astrocyten en andere cellen uit de hersenen van de muis. Deze methode is een wijziging van de technieken die eerder gerapporteerd en biedt Oligodendrocyt voorbereiding zuiverheid boven de 80% in ongeveer 4 uur.

Introduction

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Oligodendrocyten (OLs) zijn de cellen van de myelinating van het centrale zenuwstelsel (CNS)1. De isolatie en de cultuur van primaire oligodendrocyten in een strak gereguleerde omgeving is een waardevol instrument voor het in vitro onderzoek naar de ontwikkeling van oligodendroglia, alsook de biologie van demyeliniserende ziekten zoals multiple sclerose,2 . Dit vereist een efficiënte en robuuste Oligodendrocyt isolatie en cultuur methode3. In deze studie profiteerde we van de expressie van een onderscheidende Oligodendrocyt cel oppervlakte markering om een gemodificeerde isolatie-techniek....

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Protocol

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De muizen gebruikt in deze studie werden verzorgd volgens de richtlijnen van het protocolnummer SUNY Downstate Medical Center divisie van laboratorium dier middelen (DLAR) 15-10492.

Opmerking: Primaire oligodendrocyten werden geïsoleerd van neonatale (P5-P7 wild-type C57Bl/6N) muizen. In dit stadium vormen onvolwassen OLs meer dan 80% van de knaagdier witte stof zorgen voor hoge cellulaire opbrengst. Alle buffer en reagens composities zijn beschikbaar aan het einde van de Tabel van materialen.

1. Coverslips voorbereiding

Opmerking: Poly-D-lysine (PDL) / laminin gecoat co....

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Results

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Het doel van deze studie was om een verbeterde isolatie methode voor O4+ primaire muisknop oligodendrocyten waarvoor de minste mogelijke manipulatie van de doelcellen. De hele procedure van euthanasie voor de pups aan de beplating van de cellen in coverslips duurt ongeveer 4 uur en gegevens hieronder vertegenwoordigen drie onafhankelijke experimenten. Na weefsel dissociatie, gemiddeld 4,3 ± 0,46 x 107 cellen waren geïsoleerd voor elke onafhankelijke experiment met ee.......

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Discussion

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In deze mededeling presenteren we een methode voor de efficiënte isolatie van hoogst gezuiverde onvolwassen muis Oligodendrocyt culturen. In vergelijking met eerder gepubliceerde protocollen39,40, leverde deze methode een hogere zuiverheid met een veel lager niveau van GFAP-positieve astrocyten en een zeer laag percentage van andere cellen niet-gekenmerkt. Het is belangrijk om erop te wijzen dat deze onrijpe OLs al toegezegd om de oligodendroglial afstamming. Dus.......

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Disclosures

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De auteurs hebben geen informatieverschaffing.

Acknowledgements

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Deze studie werd ondersteund door subsidies van de National Multiple Sclerosis Society (RG4591A1/2) en de National Institutes of Health (R03NS06740402). De auteurs bedanken Dr Ivan Hernandez en zijn leden van de lab voor het verstrekken van laboratorium ruimte, apparatuur en advies.

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Materials

List of materials used in this article
NameCompanyCatalog NumberComments
10ml serological pipetsFisher Scientific13-676-10J
10ml syringe Luer-Loc tipBD, Becton Dickinson309604
15ml conical tubesFalcon352097
24-well tissue culture platesFalcon353935
40µm cell strainerFisher Scientific22368547
50ml conical tubesFalcon352098
5ml serological pipetsFisher Scientific13-676-10H
60mm tissue culture platesFalcon353002
70µm cell strainerFisher Scientific22363548
Alexa Fluor 488 goat anti-mouse IgG (H+L) secondary antibodyInvitrogenA11001
Alexa Fluor 488 goat anti-rabbit IgM (H+L) secondary antibodyInvitrogenA21042
Alexa Fluor 488 goat anti-rabbit IgM (H+L) secondary antibodyInvitrogenA11008
Alexa Fluor 594 goat anti-chicken IgG (H+L) secondary antibodyInvitrogenA11042
Anti-O4 beads- Anti-O4MicroBeadsMiltenyi Biotec130-094-543
Apo-Transferrin humanSigmaT1147
Autofil complete bottle top filter assembly, 0.22um filter, 250mlUSA Scientific6032-1101
Autofil complete bottle top filter assembly, 0.22um filter, 250mlUSA Scientific6032-1102
B27 SupplementInvitrogen17504-044
Boric acidSigmaB7660
Bovine Growth Serum (BGS)GE Healthcare Life SciencesSH30541.03
BSAFisher ScientificBP-1600-100
CNTFPeprotech450-50
d-BiotinSigmaB4639
Desoxyribonuclease I (DNAse I)WorthingtonLS002007
EDTAFisher ScientificS311
Epifluorescence microscope with an Olympus DP70 cameraOlympusBx51
Feather disposable scalpelsAndwin ScientificEF7281C
ForskolinSigmaF6886
German glass coverslips, #1 thickness, 12mm diameter roundNeuVitroGG-12-oz
GFAP antibodyAvesGFAP
GlucoseFisher ScientificD16-1
GlutaMAXInvitrogen35050-61
InsulinInvitrogen12585-014
Magnetic separator stand - MACS multistandMiltenyi Biotec130-042-303
Magnetic separator-MiniMACS separatorMiltenyi Biotec130-042-302
Millex PES 0.22µm filter unitMilliporeSLG033RS
Mounting media- Prolong Gold with DAPIThermo FisherP36930
N-acetyl-cysteine (NAC)SigmaA8199
Natural mouse lamininInvitrogen23017-015
Neurobasal Medium AInvitrogen10888-022
Neurotrophin-3 (NT-3)Peprotech450-03
NG2 antibodyMilliporeAB5320
PapainWorthingtonLS003126
PBS without Ca2+ and Mg2+SigmaD5652
PDGFPeprotech100-13A
Petri dishesFalcon351029
Poly-D-LysineSigmaP6407
PrimocinInvivogenant-pm-2
ProgesteroneSigmaP8783
PutrescineSigmaP5780
Selection column-LS columnsMiltenyi Biotec130-042-401
Sodium SeleniteSigmaS5261
Trace elements BCorning25-000-CI
Triiodothyronine (T3)SigmaT6397
Triton-XSigmaT8787
Trypan Blue SolutionCorning25-900-CI
Tween 20SigmaP1379
B27NBMA487.75 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% BGS27 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.
d-Biotin stock solution (50 µg/ml; 5000X)Resuspend d-Biotin (Sigma-B4639) in double-distilled H2O at 50 µg/ml (e.g. 2.5 mg in 50 ml of ddH2O). Resuspension might take fair amount of agitation/vortexing, or mild warming briefly at 37°C. If the d-Biotin still will not solubilize, it is fine to make up a less concentrated (e.g. 10µg/ml), and to add a higher volume to the B27NBMA (1/1000), instead of 1/5000). Store at 4°C.
DNase I stock solution1. 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.
Forskolin stock solution (4.2 mg/ml; 1000X)Add 1 ml of sterile DMSO to 50 mg Forskolin in bottle (Sigma-F6886) and pipette until resuspended. Transfer to a 15 ml centrifuge tube and add 11 ml of sterile DMSO to bring to 4.2 mg/ml. Aliquot (e.g. 20 µl) and store at -20°C.
Hank’s balanced salts (HBSS) (Sigma1. 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.
Insulin stock solution (4000 µg/ml)Thaw the bottle and aliquot 25 µl per microcentrifuge tube and store at -20°C.
Laminin solutionSlowly thaw laminin in the cold (2°C to 8°C) to avoid gel formation. Then, aliquot into polypropylene tubes. Store at 5° C to -20° C in aliquots (e.g. 20 µl) and do not freeze/thaw repeatedly. Laminin may be stored at these temperatures for up to six months.
Magnetic Cell Sorting (MCS) BufferPrepare 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
N-Acetyl-L-cysteine (NAC) stock solution (5mg/ml; 1000X)Dissolve N-Acetyl-L-cysteine (Sigma-A8199) at 5 mg/ml in DMEM (e.g. 50 mg NAC in 10 ml B27NBMA). Filter sterilize and aliquot (e.g. 20 µl). Store at -20°C.
NT3 stock solution (1 µg/ml; 1000X)Master stock:
Order from Peprotech (450-03). Make up at 0.1 to 1 mg/ml according to manufacturer’s instructions (may vary from lot to lot), in buffer (e.g. DPBS + 0.2% BSA). Store at -80°C.

Working stock (1µg/ml; 1000X):
1. Make on 0.2% BSA in DPBS solution and filter sterilize.
2. Dilute master stock aliquot to 1 µg/ml in sterile, chilled 0.2% BSA/DPBS.
3. Aliquot (e.g. 20µl/tube) and snap freeze in liquid nitrogen.
4. Store aliquots at -80°C.
PDGF stock solution (10 µg/ml; 1000X)Master stock:
Order from Peprotech (100-13A). Make up at 0.1 to 1 mg/ml according to manufacturer’s instructions (may vary from lot to lot) in buffer (e.g. DPBS) + 0.2% BSA). Store at -80°C.

Working stock (1µg/ml; 1000X):
1. Make on 0.2% BSA in DPBS solution and filter sterilize.
2. Dilute master stock aliquot to 1µg/ml in sterile, chilled 0.2% BSA/DPBS.
3. Aliquot (e.g. 20µl/tube) and snap freeze in liquid nitrogen.
4. Store aliquots at -80°C.
Poly-D-lysine (1mg/ml; 100X)Resuspend poly-D-lysine, molecular weight 70-150 kD (Sigma P6407) at 0.5mg/ml in 0.15M boric acid pH 8.4 (e.g. 50mg in 50ml borate buffer). Filter sterilize and aliquot (e.g. 100µl/tube). Store at -20°C. Prior to use, dilute the 100X stock (1mg/ml) to 50 µg/ml in sterile water.
Oligodendrocyte proliferation mediasee Supplementary Table 1
Oligodendrocyte differentiation mediasee Supplementary Table 1
Sato supplement (100X)see Supplementary Table 1
References: the list of reagents and recipes were adopted from the protocols previously described by Emery et. al. 2013 (Emery, B. & Dugas, J. C. Purification of oligodendrocyte lineage cells from mouse cortices by immunopanning. Cold Spring Harb Protoc. 2013 (9), 854-868, doi:10.1101/pdb.prot073973, (2013)) and Dincman et. al. (Dincman, T. A., Beare, J. E., Ohri, S. S. & Whittemore, S. R. Isolation of cortical mouse oligodendrocyte precursor cells. J Neurosci Methods. 209 (1), 219-226, doi:10.1016/j.jneumeth.2012.06.017, (2012))

References

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  1. Emery, B. Regulation of oligodendrocyte differentiation and myelination. Science. 330 (6005), 779-782 (2010).
  2. Yang, Z., Watanabe, M., Nishiyama, A. Optimization of oligodendrocyte progenitor cell culture method for enhanced survival. J Neurosci Methods.

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Tags

Oligodendrocyte IsolationImmunomagnetic SeparationO4 Positive CellsPrimary OligodendrocytesNeonatal Mouse PupsMagnetic Cell SortingCell Strainer FiltrationCentrifugation ProtocolOligodendrocyte ProliferationImmunofluorescence Staining

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