Name: flow cytometry-based drug screening system for the identification of small molecules that promote cellular differentiation of glioblastoma stem cells
Uploaded: 2018-01-10T14:00:00
Description: Watch this Scientific Journal Video about Flow Cytometry-based Drug Screening System for the Identification of Small Molecules That Promote Cellular Differentiation of Glioblastoma Stem Cells at JoVE.

Detta arbete har varit delvis stöd av NIH R01CA187780.

Obs: Astroglial och neuronala lentivirus reporter system inköptes som färdigförpackade, koncentrerad lentiviral preparat. Grundläggande kunskap om flödet flödescytometri teknik krävs. Även, för ett fullt utnyttjande av detta protokoll måste användaren tillgång till en flödescytometer med hög genomströmning kapacitet (accepterar 96 brunnar som provkällan).
1. lentiviral transkriptionell Reporter systemet
Obs: I alla flödesanalyser flödescytometrisk, a...

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	<li>Maher, E. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Malignant+glioma:+genetics+and+biology+of+a+grave+matter.">Malignant glioma: genetics and biology of a grave matter.</a> Genes Dev. 15 (11), 1311-1333 (2001).</li><li>Bonavia, R., Inda, M. M., Cavenee, W. K., Furnari, F. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heterogeneity+maintenance+in+glioblastoma:+a+social+network.">Heterogeneity maintenance in glioblastoma: a social network.</a> Cancer Res. 71 (12), 4055-4060 (2011).</li><li>Bao, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Glioma+stem+cells+promote+radioresistance+by+preferential+activation+of+the+DNA+damage+response.">Glioma stem cells promote radioresistance by preferential activation of the DNA damage response.</a> Nature. 444 (7120), 756-760 (2006).</li><li>Sul, J., Fine, H. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Malignant+gliomas:+new+translational+therapies.">Malignant gliomas: new translational therapies.</a> Mt Sinai J Med. 77 (6), 655-666 (2010).</li><li>Bar, E. E., Chaudhry, A., Farah, M. H., Eberhart, C. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hedgehog+signaling+promotes+medulloblastoma+survival+via+Bc/II.">Hedgehog signaling promotes medulloblastoma survival via Bc/II.</a> Am J Pathol. 170 (1), 347-355 (2007).</li><li>Chu, Q., Orr, B. A., Semenkow, S., Bar, E. E., Eberhart, C. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Prolonged+inhibition+of+glioblastoma+xenograft+initiation+and+clonogenic+growth+following+in+vivo+Notch+blockade.">Prolonged inhibition of glioblastoma xenograft initiation and clonogenic growth following in vivo Notch blockade.</a> Clin Cancer Res. 19 (12), 3224-3233 (2013).</li><li>Schreck, K. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Notch+target+Hes1+directly+modulates+Gli1+expression+and+Hedgehog+signaling:+a+potential+mechanism+of+therapeutic+resistance.">The Notch target Hes1 directly modulates Gli1 expression and Hedgehog signaling: a potential mechanism of therapeutic resistance.</a> Clin Cancer Res. 16 (24), 6060-6070 (2010).</li><li>Warrell, R. P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differentiation+therapy+of+acute+promyelocytic+leukemia+with+tretinoin+(all-trans-retinoic+acid).">Differentiation therapy of acute promyelocytic leukemia with tretinoin (all-trans-retinoic acid).</a> N Engl J Med. 324 (20), 1385-1393 (1991).</li><li>Piccirillo, S. G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bone+morphogenetic+proteins+inhibit+the+tumorigenic+potential+of+human+brain+tumour-initiating+cells.">Bone morphogenetic proteins inhibit the tumorigenic potential of human brain tumour-initiating cells.</a> Nature. 444 (7120), 761-765 (2006).</li><li>Bar, E. E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cyclopamine-mediated+hedgehog+pathway+inhibition+depletes+stem-like+cancer+cells+in+glioblastoma.">Cyclopamine-mediated hedgehog pathway inhibition depletes stem-like cancer cells in glioblastoma.</a> Stem Cells. 25 (10), 2524-2533 (2007).</li><li>Bar, E. E., Lin, A., Mahairaki, V., Matsui, W., Eberhart, C. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypoxia+increases+the+expression+of+stem-cell+markers+and+promotes+clonogenicity+in+glioblastoma+neurospheres.">Hypoxia increases the expression of stem-cell markers and promotes clonogenicity in glioblastoma neurospheres.</a> Am J Pathol. 177 (3), 1491-1502 (2010).</li><li>Kahlert, U. D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CD133/CD15+defines+distinct+cell+subpopulations+with+differential+in+vitro+clonogenic+activity+and+stem+cell-related+gene+expression+profile+in+in+vitro+propagated+glioblastoma+multiforme-derived+cell+line+with+a+PNET-like+component.">CD133/CD15 defines distinct cell subpopulations with differential in vitro clonogenic activity and stem cell-related gene expression profile in in vitro propagated glioblastoma multiforme-derived cell line with a PNET-like component.</a> Folia Neuropathol. 50 (4), 357-368 (2012).</li><li>Lim, K. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inhibition+of+monocarboxylate+transporter-4+depletes+stem-like+glioblastoma+cells+and+inhibits+HIF+transcriptional+response+in+a+lactate-independent+manner.">Inhibition of monocarboxylate transporter-4 depletes stem-like glioblastoma cells and inhibits HIF transcriptional response in a lactate-independent manner.</a> Oncogene. 33 (35), 4433-4441 (2014).</li><li>Kahlert, U. D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=ZEB1+Promotes+Invasion+in+Human+Fetal+Neural+Stem+Cells+and+Hypoxic+Glioma+Neurospheres.">ZEB1 Promotes Invasion in Human Fetal Neural Stem Cells and Hypoxic Glioma Neurospheres.</a> Brain Pathol. 25 (6), 724-732 (2014).</li><li>Hu, Y., Smyth, G. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=ELDA:+extreme+limiting+dilution+analysis+for+comparing+depleted+and+enriched+populations+in+stem+cell+and+other+assays.">ELDA: extreme limiting dilution analysis for comparing depleted and enriched populations in stem cell and other assays.</a> J Immunol Methods. 347 (1-2), 70-78 (2009).</li><li>Meyer, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Single+cell-derived+clonal+analysis+of+human+glioblastoma+links+functional+and+genomic+heterogeneity.">Single cell-derived clonal analysis of human glioblastoma links functional and genomic heterogeneity.</a> Proc Natl Acad Sci U S A. 112 (3), 851-856 (2015).</li><li>Galli, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+and+characterization+of+tumorigenic,+stem-like+neural+precursors+from+human+glioblastoma.">Isolation and characterization of tumorigenic, stem-like neural precursors from human glioblastoma.</a> Cancer Res. 64 (19), 7011-7021 (2004).</li><li>Spina, R., Voss, D. M., Asnaghi, L., Sloan, A., Bar, E. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Atracurium+Besylate+and+other+neuromuscular+blocking+agents+promote+astroglial+differentiation+and+deplete+glioblastoma+stem+cells.">Atracurium Besylate and other neuromuscular blocking agents promote astroglial differentiation and deplete glioblastoma stem cells.</a> Oncotarget. 7 (1), 459-472 (2016).</li></ol>

Medan de flesta av de tidigare studierna av GSCs inriktades främst på de markörer som definierar dem, i denna studie beslutade vi att ta den omvända strategin. Vi fokuserar främst på de differentierade avkommor som genereras av GSCs (t.ex. celler som uttrycker astroglial och neuronala markörer). Här visar vi ett utnyttjande av en cell-baserad hög genomströmning drug screening system, som bygger på mänskliga Fredsgenomförande arrangören-beroende uttryck för god Jordbrukarsed. Alla experiment utfördes utnyt...

Nyligen genomförda studier har visat att tumörer innehåller en liten population av celler, kallas cancerstamceller (CSCs) eller tumör-inleda celler, som är ansvariga för tumör progression, metastaser och motstånd till chemo - och radio-terapier 1, 2. förekomsten av cancerstamceller och deras mer differentierade avkommor inom tumörer anses vara en viktig faktor att främja intratumoral heterogenitet och utgör därmed ett stort hinder i behandling av cancer3. Tumör cell hierarki, som tillhandahålls av cancer stamceller teorin, har inspirerat utvecklingen av nya strategier för att behandla cancer 4. En metod för inriktning cancerstamceller är att identifiera och hämma signalvägar som är kända att krävas under fosterutvecklingen av det drabbade organet. Faktiskt har vi och andra tidigare publicerat flera artiklar som beskriver pågående kravet för de neurala stamceller-relevanta signalvägar Sonic Hedgehog och skåran i glioblastoma5,6,7. Detta arbete har hjälpt stelnar den logiska grunden för flera GBM kliniska prövningar. En andra strategi för inriktning cancerstamceller är att främja deras differentiering. Detta synsätt har fått mycket stöd på grund av de gynnsamma resultat från prekliniska och kliniska studier vid behandling av akut promyeloisk leukemi med retinoinsyra syror (ATRA, en vitamin A-analog). Här hittades ATRA ta bort blocket mognad och främja cancer cell differentiering8. Mer nyligen, Piccirillo och kollegor har elegant visat att BMP-4 främjar GSC differentiering in astrocyter med betydande anti-GBM effekter in vitro- och in-vivo9.
Den logiska grunden för den aktuella studien är baserad på en ”reversed engineering” strategi för att rikta GSCs. Med tanke på den stora heterogeniteten som är närvarande i GBM och med dålig differentiering är ett av kännetecknen för cancer, frågade vi om vi kunde främja en mer gynnsam fenotyp - differentiering in ett Astrocyten-liknande tillstånd. Här, har vi inte tidigare kunskap om de signalvägar som underhåller GSCs i given tumör prov men snarare syftar till att uppnå en önskad fenotyp (e.g. Fredsgenomförande positivitet).
Rapporten beskriver de förfaranden som används för att fastställa GSC differentiering reporter-linjer från transduktion av GSC-berikad kulturer till GSC klonförädling. De glioblastoma neurosphere linjerna används fastställdes vid Professor Angelo Vescovi laboratorium från patienter med diagnosen primär glioblastoma på sjukhuset San Raffaele - Milano, Italien. Dessa linjer har studerats i flera publikationer 6,10,11,12,13,14. Det rekommenderas att individer som är intresserade av att genomföra dessa tekniker i deras laboratorium avgöra relevansen av reportern till cancer stamceller självförnyelse kapacitet i de celler som de planerar att studera (detta är sant för någon reporter). Ett detaljerat protokoll för en av in vitro- clonogenic analyserna accepteras i fältet finns för att åstadkomma detta15,16. Slutligen finns ett detaljerat protokoll som beskriver användningen av differentiering reporter-raderna i en flödescytometri-baserat drog skärm i slutet. Notera, har likaså till astroglial differentiering systemet beskrivs här, vi framgångsrikt etablerat och validerade GSC reporter linjer att integrera en MAP2:GFP (neuronal differentiering) reporter. Därför, metoderna som Beskriv i detta papper kan användas för att studera celldifferentiering i olika cell härstamningar.
Några av siffrorna i denna rapport kan hittas i en ny publikation: ”Atracurium Besylate och andra neuromuskulärt blockerande medel främja astroglial differentiering och bryter ned glioblastoma stamceller18.

<table>
	<tbody>
		<tr>
			<td>ESGRO Complete Accutase</td>
			<td>EMD Millipore</td>
			<td>SF006</td>
			<td></td>
		</tr>
		<tr>
			<td>Dimethyl Sulfoxide (DMSO)</td>
			<td>Sigma Aldrich</td>
			<td>D2650</td>
			<td></td>
		</tr>
		<tr>
			<td>HBSS (Hank&#39;s Balanced Salt Solution)</td>
			<td>Sigma Aldrich</td>
			<td>H6648</td>
			<td></td>
		</tr>
		<tr>
			<td>Human GFAP Differentiation Reporter (pGreenZeo, Virus)</td>
			<td>SBI (System Biosciences)</td>
			<td>SR10015VA-1</td>
			<td></td>
		</tr>
		<tr>
			<td>50 ml sterile disposable reagent reservoirs</td>
			<td>Corning</td>
			<td>4870</td>
			<td></td>
		</tr>
		<tr>
			<td>6 well plate</td>
			<td>Thermo Fisher Scientific</td>
			<td>130184</td>
			<td></td>
		</tr>
		<tr>
			<td>96 well plate</td>
			<td>Falcon</td>
			<td>353072</td>
			<td></td>
		</tr>
		<tr>
			<td>Biolite T25 cm&#178; Flask Vented</td>
			<td>Thermo Fisher Scientific</td>
			<td>130189</td>
			<td></td>
		</tr>
		<tr>
			<td>Biolite T75 cm&#178; Flask Vented</td>
			<td>Thermo Fisher Scientific</td>
			<td>130190</td>
			<td></td>
		</tr>
		<tr>
			<td>15 ml Centrifuge tubes</td>
			<td>Celltreat</td>
			<td>229411</td>
			<td></td>
		</tr>
		<tr>
			<td>1.5ml Microcentrifuge tubes</td>
			<td>Fisher Scientific</td>
			<td>05-408-129</td>
			<td></td>
		</tr>
		<tr>
			<td>Ovation Multi Channel Pipette, 12 Channel, 0.5 - 20uL</td>
			<td>VistaLab Technologies</td>
			<td>1060-0020</td>
			<td></td>
		</tr>
		<tr>
			<td>Ovation Multi Channel Pipette, 12 Channel, 5-250uL</td>
			<td>VistaLab Technologies</td>
			<td>1060-0250</td>
			<td></td>
		</tr>
		<tr>
			<td>Multi 12-channel pipette tips 25 &#956;l</td>
			<td>VistaLab Technologies</td>
			<td>4060-1002</td>
			<td></td>
		</tr>
		<tr>
			<td>Multi 12-channel pipette tips 250 &#956;l</td>
			<td>VistaLab Technologies</td>
			<td>4060-9025</td>
			<td></td>
		</tr>
		<tr>
			<td>Guava easyCyte 5HT Benchtop Flow Cytometer</td>
			<td>EMD Millipore</td>
			<td>0500-4005</td>
			<td></td>
		</tr>
		<tr>
			<td>NIH Clinical Collections 1 and 2 small molecule libraries</td>
			<td>Evotec</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Name</td>
			<td>Company</td>
			<td>Catalog Number</td>
			<td>Comments</td>
		</tr>
		<tr>
			<td>For the preparation of neural stem cell media (500 mL)</td>
			<td></td>
			<td></td>
			<td>Final concentration</td>
		</tr>
		<tr>
			<td>BSA</td>
			<td>GoldBio.com</td>
			<td>A-421-250</td>
			<td>0.20%</td>
		</tr>
		<tr>
			<td>DMEM/F12 10X</td>
			<td>Corning</td>
			<td>90-091-PB</td>
			<td>1X</td>
		</tr>
		<tr>
			<td>Heparin sodium salt</td>
			<td>Sigma Aldrich</td>
			<td>H3149</td>
			<td>0.0002%</td>
		</tr>
		<tr>
			<td>HEPES 1M</td>
			<td>Sigma Aldrich</td>
			<td>H4036</td>
			<td>5.4 mM</td>
		</tr>
		<tr>
			<td>Insulin-Transferrin- Selenium (ITS -G) (100X)</td>
			<td>Life Technologies</td>
			<td>41400-045</td>
			<td>1X</td>
		</tr>
		<tr>
			<td>NaHCO3</td>
			<td>Sigma Aldrich</td>
			<td>S-5761</td>
			<td>14.5 mM</td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin (10,000 U/mL) 100X</td>
			<td>Gibco</td>
			<td>15140-122</td>
			<td>1X</td>
		</tr>
		<tr>
			<td>Progesterone</td>
			<td>Sigma Aldrich</td>
			<td>P8783</td>
			<td>16 nM</td>
		</tr>
		<tr>
			<td>Putrescine</td>
			<td>Sigma Aldrich</td>
			<td>P5780</td>
			<td>4.8 &#181;M</td>
		</tr>
		<tr>
			<td>Basic FGF (FGF2), Human</td>
			<td>GoldBio</td>
			<td>1140-02-50</td>
			<td>10 ng/ml</td>
		</tr>
		<tr>
			<td>EGF, Human</td>
			<td>GoldBio</td>
			<td>1150-04-100</td>
			<td>20 ng/ml</td>
		</tr>
		<tr>
			<td>Bottle-Top Filter, 150ml, 33mm, 0.22um, Pes, S, Ind</td>
			<td>Corning</td>
			<td>431160</td>
			<td>Use to filter sterlize media</td>
		</tr>
	</tbody>
</table>

flow cytometry-based drug screening system for the identification of small molecules that promote cellular differentiation of glioblastoma stem cells

Glioblastom (GBM) är den vanligaste och mest dödliga primär hjärntumör hos vuxna, orsakar ungefär 14 000 dödsfall varje år enbart i USA. Medianöverlevnad efter diagnos är mindre än 15 månader med maximal kirurgisk resektion, strålning och temozolomide kemoterapi. Utmaningarna som utveckla effektivare GBM behandlingar har blivit allt tydligare, och dess orubbliga invasivitet, dess motstånd mot standardbehandlingar, dess genetiska komplexiteten och molekylär anpassningsförmåga och subpopulationer av GBM celler med fenotypiska likheterna med normala stamceller, hädanefter kallas glioblastom stamceller (GSCs). Eftersom GSCs krävs för tumörtillväxt och progression, representerar differentiering-baserad terapi en livskraftig behandling modaliteten för dessa obotlig neoplasmer.
Följande protokoll beskriver en samling av förfaranden för att en hög genomströmning screening plattform syftar till identifiering av små molekyler som främjar GSC astroglial differentiering. Kärnan i systemet är en glial fibrillary sura protein (Fredsgenomförande) differentiering reporter-konstruktion. Protokollet innehåller följande allmänna procedurer: (1) om inrättande av GSC differentiering reporter linjer; (2) testning/validera relevansen av reportern till GSC self-förnyelse/clonogenic kapacitet; och (3) hög kapacitet-flödescytometri baserat drogkontroll.
Screening plattformen ger en enkel och billig metod för att identifiera små molekyler som främjar GSCs differentiering. Dessutom innehar utnyttjande av bibliotek av FDA-godkända läkemedel risken för identifiering av ämnen som kan vara repurposed snabbare. Också, terapier som främjar cancer stamcellers differentiering förväntas arbeta synergistiskt med nuvarande ”standard of care” behandlingar som har visat att identifiera och eliminera primärt mer differentierad cancerceller.

Tre oberoende patientderiverade neurospheres linjer var sensorik med lentivirus astroglial reporter kodning för ett grönt fluorescerande protein (GFP) smält i-ram med en Zeocin motstånd kassett och drivs av den mänskliga Fredsgenomförande arrangör faktorn ( Figur 1). Nästa enskilda kloner isolerades av plätering 0.7 celler per brunn i en 96 väl platta (figur 2), Detta följdes av flöde flödescytometrisk bestämning av...

Watch this Scientific Journal Video about Flow Cytometry-based Drug Screening System for the Identification of Small Molecules That Promote Cellular Differentiation of Glioblastoma Stem Cells at JoVE.

Flow Cytometry-based Drug Screening System for the Identification of Small Molecules That Promote Cellular Differentiation of Glioblastoma Stem Cells

Flöde flödescytometri-baserade Drug Screening System för identifiering av små molekyler som främjar celldifferentiering av Glioblastoma stamceller

En effektiv screening protokoll presenteras för identifiering av små molekyler som främjar astroglial differentiering i glioblastoma stamceller (GSCs). Analysen är baserad på stamcells differentiering reporter varvid uttrycket av den förbättrade GFP (andra) drivs av mänskliga Fredsgenomförande arrangören.

Glioblastoma (GBM) is the most common and most lethal primary brain tumor in adults, causing roughly 14,000 deaths each year in the U.S. alone. Median ...

The overall goal of this procedure is to screen small molecule libraries for agents that promote astroglial differentiation in glioblastoma stem cells. This method can help answer key questions in the cancer stem cell field, such as what are the signaling pathways that are required for maintaining glioblastoma stem cells in the undifferentiated state. Proper execution of this technique allows for the straightforward identification of small molecules that promote glioblastoma stem cell differentiation.The implication of this technique extend toward therapy for Ehlers-Danlos glioblastoma because reducing the percentage of glioblastoma stem cells may decrease the likelihood of recurrence. This method can also be applied to setting differentiation into other cell lineages using other reporter constructs. Our report is the first to establish a high throughput approach to screen for agents that force glioma stem cells to differentiate.Working with lentivirus particles in cancer cells derived from patients can be extremely hazardous. Therefore standard procedure for working with bloodborne pathogens should always be followed. To begin, seed one million glioblastoma stem cells or GSCs in two milliliters of complete neural stem cell growth medium in a six-well plate.Next, transduce the cells with the lentivirus reporter at a multiplicity of infection equal to five. To the cell and virus mixture, add two microliters of polybrene such that the final concentration is eight micrograms per milliliter, and incubate the cells at 37 degrees Celsius and 5%CO2 overnight. After incubation, replace the growth medium to remove unbound virus.And centrifuge cells at 360 times G for five minutes. Then carefully aspirate medium and plate cells back in a six-well plate. And continue to incubate the cells for 24 hours.Harvest 0.5 milliliters of the total culture volume. Pellet cells by centrifugation at 360 times G for five minutes at room temperature. Resuspend cells in 0.5 milliliters fresh neural stem cell growth medium.Place the plate back in the incubator to allow for expansion for at least 72 hours. Add 200 microliters of dissociation reagent and incubate for five minutes in a water bath set to 37 degrees Celsius. Dissociate cells by pippetting up and down gently.To the dissociated cells add 800 microliters of HBSS to ensure minimal cell attachment or aggregation. Next, transfer 200 microliters of each cell suspension into wells of a 96-multiwell plate. Determine the percentage of cells expressing the green fluorescent protein by flow cytometry.Record at least 10, 000 viable cells in each acquisition. In all flow cytometric analysis use parental non-transduced cells or vector-transduced nonfluorescent cells to establish baseline fluorescence. To select and expand individual subclones seed cells at a density of 0.7 cells per well in 100 microliters of neural stem cell medium in a 96-well plate.Maintain these clones in culture for 11 days. Look out for neurospheres with a diameter greater than 100 microns. We have previously established this cutoff size to retrospectively determine if the neuorsphere was originated by a self-renewing glioblastoma stem cell.This cutoff size may need optimization when working with different glioblastoma cell models. Observe the cells under a fluorescence microscope equipped with a FITC filter and mark wells that contain a single neurosphere in which approximately one 1%to 5%of the cells are GFP-positive. After marking, expand individual clones until a sufficient number of cells is available for flow cytometry analysis.Assuming the reporter clones contain 1%to 5%of GFP-positive cells, harvest 0.5 milliliters from each clone along with an equal quantity of non-transduced control cells to determine the exact percentage of GFP-positive cells. After pelleting cells at 360 times G for five minutes at room temperature, aspirate the supernatant. Add 200 microliters of dissociation reagent to each pellet and incubate the tubes in a water bath set to 37 degrees Celsius.After incubation, triturate the cells about 20 to 30 times to achieve a single cell suspension. Then add 800 microliters of HBSS to ensure minimal cell attachment or aggregation. Now transfer 200 microliters of each cell suspension into wells of a 96-multiwell plate.Finally, perform flow cytometry, recording at least 10, 000 viable cells in each acquisition. To assess the clonogenic capacity prepare single cell suspensions of differentiation reporter subclones by triturating the cells about 20 to 30 times. Then plate these cells in 100 microliters of complete neural stem cell growth medium at a density of about five to 500 cells per well in 96-multiwell plates.Maintain these cells in culture for nine to 11 days. Look for neurospheres under a light microscope. A well containing at least one single large neurosphere is considered positive.Considering parental non-transduced cells and GFP-positive lentivirus-transduced cells as controls input the total wells analyzed and the number of positive cells on the ELDA online interface. To begin screening, plate 5000 cells in 99 microliters of complete neural stem cell growth medium in a 96-well plate. Then with a 12-channel pipettor treat cells with two micromolar final concentration of diluted library compounds or with the DMSO control.Incubate the cells for 72 hours. Now add 150 microliters of cell dissociation reagent using a 12-channel pipettor in each well and incubate at 37 degrees Celsius for 20 minutes. Then gently triturate the cells in each well about 20 to 30 times using a 12-channel pipettor until a single cell suspension is achieved.Now perform flow cytometry and determine the percentage of cells expressing the GFAP:GFP reporter. First determine the cell size and viability from the forward and side scatters and gate the viable cell population. Then determine the GFP-positive cells within the viable cell population.An increase of percentage of GFP-positive cells by three standard deviations over controls is considered to be a positive hit which may be adjusted to accommodate user preference of stringency. Representative images of HSR-GBM1 GSC subclones expressing low and high levels of GFAP:GFP are shown. The subclones positive for GFAP:GFP expression were selected by flow cytometry for the patient-derived neurosphere line.Here, low GFAP:GFP indicates that less than 5%of the cells in the clone are GFP-positive, while high GFAP:GFP indicates that greater than 75%of the cells in the clone are GFP-positive. These results show that in vitro self-renewal capacity of GFAP-low subclones is higher than their GFAP-high counterparts as determined by ELDA. Therefore GH subclones are more differentiated than GL subclones.Finally, drug libraries were screened to identify agents capable to induce astroglial differentiation in GSCs. 12 drugs were found to significantly increase the percentage of cells expressing the GFAP:GFP reporter. Once mastered, this technique can be done in a few weeks if it is performed properly.Following this procedure other methods like alamarBlue assay, clonogenic assay in semisolid media, flank or intracranial xenograph injection can be performed in order to answer additional questions like the effect of selective drugs on cellular proliferation and clonogenicity in vitro and tumorigenicity in vivo. After watching this video, you should have a good understanding of how to identify compounds capable of inducing astroglial differentiation in glioblastoma stem cells.

Research

JoVE Journal

Cancer Research

Generation of High-Throughput Three-Dimensional Tumor Spheroids for Drug Screening

Generation av High-Throughput tredimensionella tumör Spheroids för drogkontroll

Cancer cells have routinely been cultured in two dimensions (2D) on a plastic surface. This technique, however, lacks the true environment a tumor mass is ...

Live-Cell Imaging Assays to Study Glioblastoma Brain Tumor Stem Cell Migration and Invasion

Live-Cell Imaging analyser för studien Glioblastoma hjärnan tumören Stem cellmigration och Invasion

Glioblastoma (GBM) is an aggressive brain tumor that is poorly controlled with the currently available treatment options. Key features of GBMs include ...

Flow Cytometric Detection of Newly-formed Breast Cancer Stem Cell-like Cells After Apoptosis Reversal

Flöde flödescytometrisk påvisa nybildade Stem Cell-liknande bröstcancerceller efter apoptos återföring

Cancer recurrence has long been studied by oncologists while the underlying mechanisms remain unclear. Recently, we and others found that a phenomenon ...

Physiologic Patient Derived 3D Spheroids for Anti-neoplastic Drug Screening to Target Cancer Stem Cells

Fysiologisk patient härledda 3D spheroids för anti-neoplastisk drog screening för att rikta cancer stamceller

In this protocol, we outline the procedure for generation of tumor spheroids within 384-well hanging droplets to allow for high-throughput screening of ...

Differentiation of Mouse Breast Epithelial HC11 and EpH4 Cells

Differentiering av Musbröstepitel HC11 och EpH4 Celler

Cadherins play an important role in the regulation of cell differentiation as well as neoplasia. Here we describe the origins and methods of the induction ...

Establishment and Characterization of Small Bowel Neuroendocrine Tumor Spheroids

Etablering och karakterisering av små tarm neuroendokrina tumör spheroids

Small bowel neuroendocrine tumors (SBNETs) are rare cancers originating from enterochromaffin cells of the gut. Research in this field has been limited ...

Identification of Transcription Factor Regulators using Medium-Throughput Screening of Arrayed Libraries and a Dual-Luciferase-Based Reporter

Identifiering av transkriptionsfaktor regulatorer med hjälp av Medium-Genomströmning Screening av arrayed bibliotek och en Dual-Luciferase-Based Reporter

Transcription factors can alter the expression of numerous target genes that influence a variety of downstream processes making them good targets for ...

Drug Screening of Primary Patient Derived Tumor Xenografts in Zebrafish

Läkemedelsscreening av primär patient härledd tumör Xenografts i Zebrafish

Patient derived xenograft models are critical in defining how different cancers respond to drug treatment in an in vivo system. Mouse models are the ...

Co-culture of Glioblastoma Stem-like Cells on Patterned Neurons to Study Migration and Cellular Interactions

Samkultur av Glioblastoma stamliknande celler på mönstrade nervceller för att studera migration och cellulära interaktioner

Glioblastomas (GBMs), grade IV malignant gliomas, are one of the deadliest types of human cancer because of their aggressive characteristics. Despite ...

In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells

In Vivo Immunogenicity Screening of Tumor-Derived Extracellular Vesicles by Flow Cytometry of Splenic T Cells

In Vivo Immunogenicitet Screening av tumör-härledda extracellulära vesicles av flöde cytometri av splenic T-celler

Immunogenic cell death of tumors, caused by chemotherapy or irradiation, can trigger tumor-specific T cell responses by releasing danger-associated ...