Agradecemos al Dr. Soshana Svendsen para la revisión y edición de este informe crítico. Este trabajo ha sido aportada por el NIH / NINDS 1U24NS078370-01 y el CIRM Dr2a-05320.

Los autores no tienen nada que revelar.

<img alt="La figura 6" fo:content-width="5in" src="/files/ftp_upload/51219/51219fig6highres.jpg" width="500" /> Figura 6. Esquema de cortar. Expandiendo las células madre esferoide / progenitoras en la cultura con el método de cortar mecánica. Pasos críticos Una visión general del paradigma de la expansión de picar se muestra en la Figura 6. HNPC tamaño de la esfera es uno de los ...

A correction was made to <a href="/video/51219">A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue</a>. The corresponding author was changed from:
Brandon C. Shelley 
to:
Clive Svendsen

A correction was made to <a href="/video/51219">A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue</a>. The corresponding author was changed.

Erratum: A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue

Hay una larga historia de la expansión de las células madre neurales de roedores en la cultura, ya sea como una monocapa 1-3 o 4-7 neuroesferas agregados. Además, las células progenitoras neurales humanas (hNPCs) aisladas a partir de diversas regiones del sistema nervioso central en desarrollo 8-17 han sido expandidas in vitro. Estas células son bi-potentes, capaces de diferenciarse en astrocitos y neuronas y han sido una herramienta muy útil en el estudio del desarrollo neural 18,19 y las enfermedades mecanismo de 20,21. hNPCs también se han trasplantado en muchos modelos animales diferentes de enfermedad del sistema nervioso central con diferentes niveles de integración, la supervivencia y efectos funcionales 22-24. Tradicionalmente, roedor o NPC derivadas de fetos humanos están expuestos a factores de crecimiento - factor de frecuencia de crecimiento epidérmico (EGF) y / o factor de crecimiento de fibroblastos-2 (FGF-2) 25-28 - y tanto adherente 29 y tresSistemas de esferoide-dimensionales se pasan típicamente usando disociación enzimática en una suspensión de una sola célula 30-34. El método estándar para expandir las células para la investigación o el uso clínico es como una monocapa adherente debido a la fácil manipulación. Sin embargo, hemos demostrado que los pases en monocapa y de neuroesferas con hNPCs enzimática o soluciones químicas resultaron en la senescencia temprana 35. Además, la disociación enzimática puede dar lugar a mayores niveles de diferenciación y anomalías del cariotipo basados ​​en datos demostrados con células madre embrionarias 36-38. Aunque el método estándar de hNPCs pases ha producido buenas prácticas de fabricación actuales (cGMP) productos de calidad que han pasado a la fase 1 de pruebas clínicas (Stem Cells Inc., Neuralstem Inc.), el método permite únicamente un par de rondas de amplificación de células, lo que limita la banca potencial. Está claro que los grandes experimentos de investigación y ensayos clínicos futuros podrían beneficiarse de la capacidad depropagar células en grandes cantidades y con el retraso en la senescencia para permitir el crecimiento a gran escala y de bancos de células. Para satisfacer esta necesidad, hemos desarrollado una forma novedosa y automatizado de neuroesferas intactos mecánicamente pases por &quot;picar&quot; en pequeños grupos para mantener el contacto de célula a célula. Este método aumenta en gran medida su vida útil 39 y suspensión de cultivo permite un uso más eficiente del espacio de la incubadora en comparación con cultivos en monocapa, como se ve con un método de cultivo del biorreactor 3D alternativa 40. El protocolo de cortar proporcionado permite la producción de bancos a gran escala a partir de una muestra fetal mayor que el paso 10, una hazaña poco probable utilizando métodos estándar pases. Si bien este método para hNPCs pases es poco convencional, que está creciendo en popularidad y fue recientemente publicado con otros tipos de células, como las células madre neurales derivadas de células madre pluripotentes inducidas de embriones humanos y, lo que permite la expansión a gran escala para diversas aplicaciones incluyendo en vitro modelado enfermedad 41-46. Es importante destacar que un cGMP grado banco de células hNPC ya se ha producido con el método de cortar, lo que demuestra que la técnica se puede aplicar a futuras aplicaciones clínicas.

<table border="0" cellpadding="0" cellspacing="0" width="1230">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;">Beaker, 50 mL</td>
			<td style="width:159px;">Fisherbrand</td>
			<td>FB-100-50</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">Bio-Safety Cabinet, class II</td>
			<td style="width:159px;">Baker</td>
			<td style="width:128px;">SG-603A</td>
			<td style="width:464px;">4 ft. or 6 ft. model.&#160; 6 ft. model recommended; multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Blades, Double-edge Prep</td>
			<td style="width:159px;">Personna</td>
			<td style="width:128px;">74-0002</td>
			<td style="width:464px;">multiple manufacturers/suppliers.&#160; CAUTION: Sharp</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Cell Freezing Media</td>
			<td style="width:159px;">Sigma-Aldrich</td>
			<td style="width:128px;">C6295-50ML</td>
			<td style="width:464px;">DMSO, serum-free</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Centrifuge, swing-bucket with 15 mL inserts</td>
			<td style="width:159px;">Eppendorf</td>
			<td style="width:128px;">5810 R</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Conical Tubes, 15 mL</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">S50712</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Conical Tubes, 50 mL</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">352074</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Controlled Rate Freezer</td>
			<td style="width:159px;">Planer&#160;</td>
			<td style="width:128px;">Kryo 750</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Cryovials, 2 mL</td>
			<td style="width:159px;">Corning</td>
			<td style="width:128px;">430488</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Culture Flask, Vented, T12.5</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">353107</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Culture Flask, Vented, T25</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">353081</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Culture Flask, Vented, T175</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">353045</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Culture Flask, Vented, T75&#160;</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">353110</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Filter, 0.22 &#181;m, attached cup, 1 L</td>
			<td style="width:159px;">Millipore</td>
			<td style="width:128px;">SCGPU11RE</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Filter, 0.22 &#181;m, attached cup, 150 mL</td>
			<td style="width:159px;">Millipore</td>
			<td style="width:128px;">SCGVU01RE</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Filter, 0.22 &#181;m, attached cup, 500 mL</td>
			<td style="width:159px;">Millipore</td>
			<td style="width:128px;">SCGPU05RE</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Filter, 0.22 &#181;m, attached cup, 50 mL</td>
			<td style="width:159px;">Millipore</td>
			<td style="width:128px;">SCGP00525</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Filter Paper, 8.5 cm circles</td>
			<td style="width:159px;">Whatman/GE</td>
			<td style="width:128px;">1001-085</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Forceps, Standard Pattern - Serrated/Curved/18 cm</td>
			<td style="width:159px;">Fine Science Tools</td>
			<td style="width:128px;">11001-18</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Freezing Chamber, Isopropyl Alcohol</td>
			<td style="width:159px;">Nalgene</td>
			<td style="width:128px;">5100-0001</td>
			<td style="width:464px;">&#34;Mr. Frosty&#34;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Incubator, 37&#176;C/5% CO2</td>
			<td style="width:159px;">Forma</td>
			<td style="width:128px;">370 series</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Hemacytometer, Phase</td>
			<td style="width:159px;">Hausser Scientific</td>
			<td style="width:128px;">1475</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">McIlwain Tissue Chopper</td>
			<td style="width:159px;">Lafayette Instruments</td>
			<td style="width:128px;">TC752-PD</td>
			<td style="width:464px;">&#160;Petri dish modification required.&#160;&#160; CAUTION:&#160; Moving, sharp blade.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Micropipettor, 1 - 10 &#956;L</td>
			<td style="width:159px;">Gilson</td>
			<td style="width:128px;">F144562</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Micropipettor, 100 - 1000 &#956;L (starter kit)</td>
			<td style="width:159px;">Gilson</td>
			<td style="width:128px;">F167700</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Micropipettor, 2 - 20 &#956;L (starter kit)</td>
			<td style="width:159px;">Gilson</td>
			<td style="width:128px;">F167700</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Micropipettor, 20 - 200 &#956;L (starter kit)</td>
			<td style="width:159px;">Gilson</td>
			<td style="width:128px;">F167700</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Nutdriver, Autoclavable, 5/16&#34;</td>
			<td style="width:159px;">Steritool</td>
			<td style="width:128px;">10302</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Pasteur Pipets, cotton-plugged</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">13-678-8B</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Petri Dish, Glass, Autoclavable</td>
			<td style="width:159px;">Corning</td>
			<td style="width:128px;">3160-100</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Pipet Aid</td>
			<td style="width:159px;">Drummond</td>
			<td style="width:128px;">4-000-101</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Shim disc</td>
			<td style="width:159px;">McMaster-Carr</td>
			<td style="width:128px;">VARIABLE</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile barrier pipet tips, 10 &#956;L</td>
			<td style="width:159px;">AvantGuard</td>
			<td style="width:128px;">AV10R-H</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile barrier pipet tips, 1000 &#956;L</td>
			<td style="width:159px;">AvantGuard</td>
			<td style="width:128px;">AV1000</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile barrier pipet tips, 20 &#956;L</td>
			<td style="width:159px;">AvantGuard</td>
			<td style="width:128px;">AV20-H</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile barrier pipet tips, 200 &#956;L</td>
			<td style="width:159px;">AvantGuard</td>
			<td style="width:128px;">AV200-H</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile Disposable pipettes, all-plastic wrap, 10 mL</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">13-676-10J</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile Disposable pipettes, all-plastic wrap, 2 mL</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">13-675-3C</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile Disposable pipettes, all-plastic wrap, 25 mL</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">13-676-10K</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterile Disposable pipettes, all-plastic wrap, 5 mL</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">13-676-10H</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Sterilization Pouches, 19 x 33 cm</td>
			<td style="width:159px;">Crosstex</td>
			<td style="width:128px;">SCL</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:479px;">Strainer, 40 &#181;m</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">352340</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Tissue Culture Dishes, 60 mm</td>
			<td style="width:159px;">BD Falcon</td>
			<td style="width:128px;">351007</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Tube Racks, Interlocking Four-Way</td>
			<td style="width:159px;">Fisherbrand</td>
			<td style="width:128px;">03-448-17</td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Water Bath</td>
			<td style="width:159px;">Fisherbrand</td>
			<td>S52602Q</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;"></td>
			<td style="width:159px;"></td>
			<td></td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Neural Progenitor Cell-Specific Processing Reagents</td>
			<td style="width:159px;"></td>
			<td style="width:128px;"></td>
			<td style="width:464px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Neural Stem Cell Expansion Medium (Stemline)</td>
			<td style="width:159px;">Sigma-Aldrich</td>
			<td style="width:128px;">S3194-500ML</td>
			<td style="width:464px;">Important to use the Stemline brand</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Recombinant Human Epidermal Growth Factor (EGF)</td>
			<td style="width:159px;">Millipore</td>
			<td style="width:128px;">GF316</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Recombinant Human Leukemia Inhibitory Factor (LIF)</td>
			<td style="width:159px;">Millipore</td>
			<td style="width:128px;">LIF1010</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">Trypan Blue (0.4%)</td>
			<td style="width:159px;">Sigma-Aldrich</td>
			<td style="width:128px;">T8154-100ML</td>
			<td style="width:464px;">multiple manufacturers/suppliers</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:479px;">TrypLE Select (1X)</td>
			<td style="width:159px;">Life Technologies</td>
			<td style="width:128px;">12563-011</td>
			<td style="width:464px;"></td>
		</tr>
	</tbody>
</table>

a cgmp-applicable expansion method for aggregates of human neural stem and progenitor cells derived from pluripotent stem cells or fetal brain tissue

Una técnica de expansión de células para acumular grandes cantidades de células a partir de una sola muestra para experimentos de investigación y ensayos clínicos se beneficiaría en gran medida a la comunidad de células madre. Muchos métodos actuales de expansión son laboriosos y costosos, y los que implican la disociación completa pueden causar varios tipos madre y células progenitoras a someterse a la diferenciación o la senescencia temprana. Para superar estos problemas, hemos desarrollado un método de pases mecánica automática que se refiere como &quot;cortar&quot; que es simple y de bajo costo. Esta técnica evita la disociación química o enzimática en células individuales y en su lugar permite la expansión a gran escala de suspensión, cultivos de esferoides que mantienen el contacto célula / célula constante. El método de cortar se ha usado principalmente para células derivadas de cerebro fetal neurales progenitoras o neuroesferas, y recientemente ha sido publicado para su uso con células madre neurales derivadas de células madre pluripotentes embrionarias e inducidos. El procedimiento involvES siembra neuroesferas en un cultivo de tejidos plato de Petri y posteriormente pasa a una, la cuchilla afilada estéril a través de las células de la automatización de manera efectiva el tedioso proceso de manualmente disociar mecánicamente cada esfera. La suspensión de células en cultivo proporciona una relación superficie-área-volumen favorable; como más de 500.000 células pueden ser cultivadas en una sola neuroesfera de menos de 0,5 mm de diámetro. En un matraz T175, más de 50 millones de células pueden crecer en cultivos en suspensión en comparación con sólo 15 millones en cultivos adherentes. Es importante señalar que el procedimiento de cortar ha sido utilizada bajo buenas prácticas de fabricación actuales (cGMP), que permite la producción de cantidades masivas de productos celulares de grado clínico.

<img alt="La figura 5" fo:content-width="5in" src="/files/ftp_upload/51219/51219fig5highres.jpg" width="500" /> El número de células Figura 5. Los datos representativos. A) proyectados de hNPCs congelados en p19, luego descongelados y se expandieron como una monocapa adherente mediante disociación enzimática en comparación con neuroesferas con pases a través del método de cortar. Día 0 representa cuando las células se descongelaron a p20. B)</s...

Watch this Scientific Journal Video about A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue at JoVE.

A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue

Este protocolo describe un nuevo método de cortar mecánico que permite la expansión de la madre y de células progenitoras neurales agregados esféricos sin disociación a una única suspensión de células. Mantener el contacto célula / célula permite un crecimiento rápido y estable durante más de 40 pasajes.

Un método de expansión de GMPc aplicable para agregados de Neural humano madre y células progenitoras derivadas de células madre pluripotentes o tejido cerebral fetal

A cell expansion technique to amass large numbers of cells from a single specimen for research experiments and clinical trials would greatly benefit the ...

a-cgmp-applicable-expansion-method-for-aggregates-human-neural-stem

Research

JoVE Journal

Neuroscience

13.4K vistas.  Cedars-Sinai Medical Center.  Este protocolo describe un nuevo método de cortar mecánico que permite la expansión de la madre y de células progenitoras neurales agregados esféricos sin disociación a una única suspensión de células. Mantener el contacto célula / célula permite un crecimiento rápido y estable durante más de 40 pasajes. 

Video: A cGMP-applicable Expansion Method for Aggregates of Human Neural Stem and Progenitor Cells Derived From Pluripotent Stem Cells or Fetal Brain Tissue

Neural-Colony Forming Cell Assay: An Assay To Discriminate Bona Fide Neural Stem Cells from Neural Progenitor Cells

The neurosphere assay (NSA) is one of the most frequently used methods to isolate, expand and also calculate the frequency of neural stem cells (NSCs). Furthermore, this serum-free culture system has also been employed to expand stem cells and determine their frequency from a variety of tumors and normal tissues. It has been shown recently that a one-to-one relationship does not exist between neurosphere formation and NSCs. This suggests that the NSA as currently applied, overestimates the frequency of NSCs in a mixed population of neural precursor cells isolated from both the embryonic and adult mammalian brain. This video practically demonstrates a novel collagen based semi- solid assay, the neural-colony forming cell assay (N-CFCA), which has the ability to discriminate stem from progenitor cells based on their long-term proliferative potential, and thus provides a method to enumerate NSC frequency. In the N-CFCA, colonies &ge;2 mm in diameter are derived from cells that meet all the functional criteria of a NSC, while colonies &lt; 2mm are derived from progenitors. The N-CFCA procedure can be used for cells prepared from different sources including primary and cultured adult or embryonic mouse CNS cells. Here we use cells prepared from passage one neurospheres generated from embryonic day 14 mice brain to perform N-CFCA. The cultures are replenished with proliferation medium every seven days for three weeks to allow the plated cells to exhibit their full proliferative potential and then the frequency of neural progenitor and bona fide neural stem cells is calculated respectively by counting the number of colonies that are &lt; 2mm and the ones that are &ge;2mm in reference to the number of cells that were initially plated.

This video protocol demonstrates how to discriminate and enumerate bona fide neural stem cells in a mixed population of neural precursor cells using the neural colony-forming cell assay.

Neural formadoras de colonias ensayo de células: un ensayo para discriminar Bona Fide células troncales nerviosas de células progenitoras neurales

The neurosphere assay (NSA) is one of the most frequently used methods to isolate, expand and also calculate the frequency of neural stem cells (NSCs). ...

Investigación

Neurociencias

Generation of Neural Stem Cells from Discarded Human Fetal Cortical Tissue

Neural stem cells (NSCs) reside along the ventricular zone neuroepithelium during the development of the cortical plate. These early progenitors ultimately give rise to intermediate progenitors and later, the various neuronal and glial cell subtypes that form the cerebral cortex. The capacity to generate and expand human NSCs (so called neurospheres) from discarded normal fetal tissue provides a means with which to directly study the functional aspects of normal human NSC development 1-5. This approach can also be directed toward the generation of NSCs from known neurological disorders, thereby affording the opportunity to identify disease processes that alter progenitor proliferation, migration and differentiation 6-9. We have focused on identifying pathological mechanisms in human Down syndrome NSCs that might contribute to the accelerated Alzheimer's disease phenotype 10,11. Neither in vivo nor in vitro mouse models can replicate the identical repertoire of genes located on human chromosome 21. 
Here we use a simple and reliable method to isolate Down syndrome NSCs from aborted human fetal cortices and grow them in culture. The methodology provides specific aspects of harvesting the tissue, dissection with limited anatomical landmarks, cell sorting, plating and passaging of human NSCs. We also provide some basic protocols for inducing differentiation of human NSCs into more selective cell subtypes.

A simple and reliable method on isolation and culture of neural stem cells from discarded human fetal cortical tissue is described. Cultures derived from known human neurological disorders can be used for characterization of pathological cellular and molecular processes, as well as provide a platform to assess pharmacological efficacy.

Generación de las células troncales nerviosas de desechados Humanos tejido cortical fetal

Neural stem cells (NSCs) reside along the ventricular zone neuroepithelium during the development of the cortical plate. These early progenitors ...

Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae

Since the discovery of Green Fluorescent Protein (GFP), there has been a revolutionary change in the use of live-cell imaging as a tool for understanding fundamental biological mechanisms. Striking progress has been particularly evident in Drosophila, whose extensive toolkit of mutants and transgenic lines provides a convenient model to study evolutionarily-conserved developmental and cell biological mechanisms. We are interested in understanding the mechanisms that control cell fate specification in the adult peripheral nervous system (PNS) in Drosophila. Bristles that cover the head, thorax, abdomen, legs and wings of the adult fly are individual mechanosensory organs, and have been studied as a model system for understanding mechanisms of Notch-dependent cell fate decisions. Sensory organ precursor (SOP) cells of the microchaetes (or small bristles), are distributed throughout the epithelium of the pupal thorax, and are specified during the first 12 hours after the onset of pupariation. After specification, the SOP cells begin to divide, segregating the cell fate determinant Numb to one daughter cell during mitosis. Numb functions as a cell-autonomous inhibitor of the Notch signaling pathway.
Here, we show a method to follow protein dynamics in SOP cell and its progeny within the intact pupal thorax using a combination of tissue-specific Gal4 drivers and GFP-tagged fusion proteins 1,2.This technique has the advantage over fixed tissue or cultured explants because it allows us to follow the entire development of an organ from specification of the neural precursor to growth and terminal differentiation of the organ. We can therefore directly correlate changes in cell behavior to changes in terminal differentiation. Moreover, we can combine the live imaging technique with mosaic analysis with a repressible cell marker (MARCM) system to assess the dynamics of tagged proteins in mitotic SOPs under mutant or wildtype conditions. Using this technique, we and others have revealed novel insights into regulation of asymmetric cell division and the control of Notch signaling activation in SOP cells (examples include references 1-6,7 ,8).

Live-cell Imaging of Sensory Organ Precursor Cells in Intact Drosophila Pupae

In this video, we describe a method for live cell imaging of asymmetrically dividing sensory organ progenitor cells and epidermal cells in intact Drosophila pupae

Células vivas imágenes de células de los órganos sensoriales Precursor en Intacto Drosophila Las pupas

Since the discovery of Green Fluorescent Protein (GFP), there has been a revolutionary change in the use of live-cell imaging as a tool for understanding ...

Isolation and Culture of Neural Crest Cells from Embryonic Murine Neural Tube

The embryonic neural crest (NC) is a multipotent progenitor population that originates at the dorsal aspect of the neural tube, undergoes an epithelial to mesenchymal transition (EMT) and migrates throughout the embryo, giving rise to diverse cell types 1-3. NC also has the unique ability to influence the differentiation and maturation of target organs4-6. When explanted in vitro, NC progenitors undergo self-renewal, migrate and differentiate into a variety of tissue types including neurons, glia, smooth muscle cells, cartilage and bone. 
NC multipotency was first described from explants of the avian neural tube7-9. In vitro isolation of NC cells facilitates the study of NC dynamics including proliferation, migration, and multipotency. Further work in the avian and rat systems demonstrated that explanted NC cells retain their NC potential when transplanted back into the embryo10-13. Because these inherent cellular properties are preserved in explanted NC progenitors, the neural tube explant assay provides an attractive option for studying the NC in vitro. 
To attain a better understanding of the mammalian NC, many methods have been employed to isolate NC populations. NC-derived progenitors can be cultured from post-migratory locations in both the embryo and adult to study the dynamics of post-migratory NC progenitors11,14-20, however isolation of NC progenitors as they emigrate from the neural tube provides optimal preservation of NC cell potential and migratory properties13,21,22. Some protocols employ fluorescence activated cell sorting (FACS) to isolate a NC population enriched for particular progenitors11,13,14,17. However, when starting with early stage embryos, cell numbers adequate for analyses are difficult to obtain with FACS, complicating the isolation of early NC populations from individual embryos. Here, we describe an approach that does not rely on FACS and results in an approximately 96% pure NC population based on a Wnt1-Cre activated lineage reporter23. 
The method presented here is adapted from protocols optimized for the culture of rat NC11,13. The advantages of this protocol compared to previous methods are that 1) the cells are not grown on a feeder layer, 2) FACS is not required to obtain a relatively pure NC population, 3) premigratory NC cells are isolated and 4) results are easily quantified. Furthermore, this protocol can be used for isolation of NC from any mutant mouse model, facilitating the study of NC characteristics with different genetic manipulations. The limitation of this approach is that the NC is removed from the context of the embryo, which is known to influence the survival, migration and differentiation of the NC2,24-28.

Isolation of embryonic neural crest from the neural tube facilitates the use of in vitro methods for studying migration, self-renewal, and multipotency of neural crest.

Aislamiento y cultivo de células de la cresta neural de embriones murinos del Tubo Neural

The embryonic neural crest (NC) is a multipotent progenitor population that originates at the dorsal aspect of the neural tube, undergoes an epithelial to ...

Progenitor-derived Oligodendrocyte Culture System from Human Fetal Brain

Differentiation of human neural progenitors into neuronal and glial cell types offers a model to study and compare molecular regulation of neural cell lineage development. In vitro expansion of neural progenitors from fetal CNS tissue has been well characterized. Despite the identification and isolation of glial progenitors from adult human sub-cortical white matter and development of various culture conditions to direct differentiation of fetal neural progenitors into myelin producing oligodendrocytes, acquiring sufficient human oligodendrocytes for in vitro experimentation remains difficult. Differentiation of galactocerebroside+ (GalC) and O4+ oligodendrocyte precursor or progenitor cells (OPC) from neural precursor cells has been reported using second trimester fetal brain. However, these cells do not proliferate in the absence of support cells including astrocytes and neurons, and are lost quickly over time in culture. The need remains for a culture system to produce cells of the oligodendrocyte lineage suitable for in vitro experimentation.
Culture of primary human oligodendrocytes could, for example, be a useful model to study the pathogenesis of neurotropic infectious agents like the human polyomavirus, JCV, that in vivo infects those cells. These cultured cells could also provide models of other demyelinating diseases of the central nervous system (CNS). Primary, human fetal brain-derived, multipotential neural progenitor cells proliferate in vitro while maintaining the capacity to differentiate into neurons (progenitor-derived neurons, PDN) and astrocytes (progenitor-derived astrocytes, PDA) This study shows that neural progenitors can be induced to differentiate through many of the stages of oligodendrocytic lineage development (progenitor-derived oligodendrocytes, PDO). We culture neural progenitor cells in DMEM-F12 serum-free media supplemented with basic fibroblast growth factor (bFGF), platelet derived growth factor (PDGF-AA), Sonic hedgehog (Shh), neurotrophic factor 3 (NT-3), N-2 and triiodothyronine (T3). The cultured cells are passaged at 2.5e6 cells per 75cm flasks approximately every seven days. Using these conditions, the majority of the cells in culture maintain a morphology characterized by few processes and express markers of pre-oligodendrocyte cells, such as A2B5 and O-4. When we remove the four growth factors (GF) (bFGF, PDGF-AA, Shh, NT-3) and add conditioned media from PDN, the cells start to acquire more processes and express markers specific of oligodendrocyte differentiation, such as GalC and myelin basic protein (MBP). We performed phenotypic characterization using multicolor flow cytometry to identify unique markers of oligodendrocyte.

Primary, human fetal brain-derived, multipotential progenitor cells proliferate in vitro while maintaining the capacity to differentiate into neurons and astrocytes. This work shows that neural progenitors can be induced to differentiate through stages of the oligodendrocytic lineage by conditioning with select growth factors.

Progenitor derivado de sistema de cultivo de oligodendrocitos de cerebro fetal humano

Differentiation of human neural progenitors into neuronal and glial cell types offers a model to study and compare molecular regulation of neural cell ...

Feeder-free Derivation of Neural Crest Progenitor Cells from Human Pluripotent Stem Cells

Human pluripotent stem cells (hPSCs) have great potential for studying human embryonic development, for modeling human diseases in the dish and as a source of transplantable cells for regenerative applications after disease or accidents. Neural crest (NC) cells are the precursors for a large variety of adult somatic cells, such as cells from the peripheral nervous system and glia, melanocytes and mesenchymal cells. They are a valuable source of cells to study aspects of human embryonic development, including cell fate specification and migration. Further differentiation of NC progenitor cells into terminally differentiated cell types offers the possibility to model human diseases in vitro, investigate disease mechanisms and generate cells for regenerative medicine. This article presents the adaptation of a currently available in vitro differentiation protocol for the derivation of NC cells from hPSCs. This new protocol requires 18 days of differentiation, is feeder-free, easily scalable and highly reproducible among human embryonic stem cell (hESC) lines as well as human induced pluripotent stem cell (hiPSC) lines. Both old and new protocols yield NC cells of equal identity.

Neural crest (NC) cells derived from human pluripotent stem cells (hPSC) have great potential for modeling human development and disease and for cell replacement therapies. Here, a feeder-free adaptation of the currently widely used in vitro differentiation protocol for the derivation of NC cells from hPSCs is presented.

Derivación-Feeder libres de Células Progenitoras de la cresta neural Pluripotentes Células Madre

Human pluripotent stem cells (hPSCs) have great potential for studying human embryonic development, for modeling human diseases in the dish and as a ...

Directed Dopaminergic Neuron Differentiation from Human Pluripotent Stem Cells

Dopaminergic (DA) neurons in the substantia nigra pars compacta (also known as A9 DA neurons) are the specific cell type that is lost in Parkinson&#8217;s disease (PD). There is great interest in deriving A9 DA neurons from human pluripotent stem cells (hPSCs) for regenerative cell replacement therapy for PD. During neural development, A9 DA neurons originate from the floor plate (FP) precursors located at the ventral midline of the central nervous system. Here, we optimized the culture conditions for the stepwise differentiation of hPSCs to A9 DA neurons, which mimics embryonic DA neuron development. In our protocol, we first describe the efficient generation of FP precursor cells from hPSCs using a small molecule method, and then convert the FP cells to A9 DA neurons, which could be maintained in vitro for several months. This efficient, repeatable and controllable protocol works well in human embryonic stem cells (hESCs) and human induced pluripotent stem cells (hiPSCs) from normal persons and PD patients, in which one could derive A9 DA neurons to perform in vitro disease modeling and drug screening and in vivo cell transplantation therapy for PD.

We, based on knowledge from developmental biology and published research, developed an optimized protocol to efficiently generate A9 midbrain dopaminergic neurons from both human embryonic stem cells and human induced pluripotent stem cells, which would be useful for disease modeling and cell replacement therapy for Parkinson&#8217;s disease.

Dirigida dopaminérgica Neurona La diferenciación de las células madre pluripotentes humanas

Dopaminergic (DA) neurons in the substantia nigra pars compacta  (also known as A9 DA neurons) are the specific cell type that is lost in ...

Identifying Cell Surface Markers of Primary Neural Stem and Progenitor Cells by Metabolic Labeling of Sialoglycan

Neural stem and progenitor cells (NSPCs) are the cellular basis for the complex structures and functions of the brain. They are located in specialized niches in vivo and can be isolated and expanded in vitro, serving as an important resource for cell transplantation to repair brain damage. However, NSPCs are heterogeneous and not clearly defined at the molecular level or purified due to a lack of specific cell surface markers. The protocol presented, which has been previously reported, combines a neural-endothelial co-culture system with a metabolic glycan labeling method to identify the surface sialoglycoproteome of primary NSPCs. The NSPC-endothelial co-culture system allows self-renewal and expansion of primary NSPCs in vitro, generating a sufficient number of NSPCs. Sialoglycans in cultured NSPCs are labeled using an unnatural sialic acid metabolic reporter with bioorthogonal functional groups. By comparing the sialoglycoproteome from self-renewing NSPCs expanded in an endothelial co-culture with differentiating neural culture, we identify a list of membrane proteins that are enriched in NSPCs. In detail, the protocol involves: 1) set-up of an NSPC-endothelial co-culture and NSPC differentiating culture; 2) labeling with azidosugar per-O-acetylated N-azidoacetylmannosamine (Ac4ManNAz); and 3) biotin conjugation to modified sialoglycan for imaging after fixation of neural culture or protein extraction from neural culture for mass spectrometry analysis. Then, the NSPC-enriched surface marker candidates are selected by comparative analysis of mass spectrometry data from both the expanded NSPC and differentiated neural cultures. This protocol is highly sensitive for identifying membrane proteins of low abundance in the starting materials, and it can be applied to marker discovery in other systems with appropriate modifications

Presented here is a protocol that combines an in vitro neural-endothelial co-culture system and metabolic incorporation of sialoglycan with bioorthogonal functional groups to expand primary neural stem and progenitor cells and label their surface sialoglycoproteins for imaging or mass-spectrometry analysis of cell surface markers.

Identificación de marcadores de superficie celular de células madre neuronales primarias y células progenitoras por etiquetado metabólico de sialoglicano

Neural stem and progenitor cells (NSPCs) are the cellular basis for the complex structures and functions of the brain. They are located in specialized ...

Derivation, Expansion, Cryopreservation and Characterization of Brain Microvascular Endothelial Cells from Human Induced Pluripotent Stem Cells

Brain microvascular endothelial cells (BMECs) can be differentiated from human induced pluripotent stem cells (iPSCs) to develop ex vivo cellular models for studying blood-brain barrier (BBB) function. This modified protocol provides detailed steps to derive, expand, and cryopreserve BMECs from human iPSCs using a different donor and reagents than those reported in previous protocols. iPSCs are treated with essential 6 medium for 4 days, followed by 2 days of human endothelial serum-free culture medium supplemented with basic fibroblast growth factor, retinoic acid, and B27 supplement. At day 6, cells are sub-cultured onto a collagen/fibronectin matrix for 2 days. Immunocytochemistry is performed at day 8 for BMEC marker analysis using CLDN5, OCLN, TJP1, PECAM1, and SLC2A1. Western blotting is performed to confirm BMEC marker expression, and absence of SOX17, an endodermal marker. Angiogenic potential is demonstrated with a sprouting assay. Trans-endothelial electrical resistance (TEER) is measured using chopstick electrodes and voltohmmeter starting at day 7. Efflux transporter activity for ATP binding cassette subfamily B member 1 and ATP binding cassette subfamily C member 1 is measured using a multi-plate reader at day 8. Successful derivation of BMECs is confirmed by the presence of relevant cell markers, low levels of SOX17, angiogenic potential, transporter activity, and TEER values ~2000 &#937; x cm2. BMECs are expanded until day 10 before passaging onto freshly coated collagen/fibronectin plates or cryopreserved. This protocol demonstrates that iPSC-derived BMECs can be expanded and passaged at least once. However, lower TEER values and poorer localization of BMEC markers was observed after cryopreservation. BMECs can be utilized in co-culture experiments with other cell types (neurons, glia, pericytes), in three-dimensional brain models (organ-chip and hydrogel), for vascularization of brain organoids, and for studying BBB dysfunction in neuropsychiatric disorders.

This protocol details an adapted method to derive, expand, and cryopreserve brain microvascular endothelial cells obtained by differentiating human induced pluripotent stem cells, and to study blood brain barrier properties in an ex vivo model.

Derivación, expansión, criopreservación y caracterización de células endoteliales microvasculares cerebrales de células madre pluripotentes inducidas por humanos

Brain microvascular endothelial cells (BMECs) can be differentiated from human induced pluripotent stem cells (iPSCs) to develop ex vivo cellular models ...

Flow Cytometric Analysis of Multiple Mitochondrial Parameters in Human Induced Pluripotent Stem Cells and Their Neural and Glial Derivatives

Mitochondria are important in the pathophysiology of many neurodegenerative diseases. Changes in mitochondrial volume, mitochondrial membrane potential (MMP), mitochondrial production of reactive oxygen species (ROS), and mitochondrial DNA (mtDNA) copy number are often features of these processes. This report details a novel flow cytometry-based approach to measure multiple mitochondrial parameters in different cell types, including human induced pluripotent stem cells (iPSCs) and iPSC-derived neural and glial cells. This flow-based strategy uses live cells to measure mitochondrial volume, MMP, and ROS levels, as well as fixed cells to estimate components of the mitochondrial respiratory chain (MRC) and mtDNA-associated proteins such as mitochondrial transcription factor A (TFAM). 
By co-staining with fluorescent reporters, including MitoTracker Green (MTG), tetramethylrhodamine ethyl ester (TMRE), and MitoSox Red, changes in mitochondrial volume, MMP, and mitochondrial ROS can be quantified and related to mitochondrial content. Double staining with antibodies against MRC complex subunits and translocase of outer mitochondrial membrane 20 (TOMM20) permits the assessment of MRC subunit expression. As the amount of TFAM is proportional to mtDNA copy number, the measurement of TFAM per TOMM20 gives an indirect measurement of mtDNA per mitochondrial volume. The entire protocol can be carried out within 2-3 h. Importantly, these protocols allow the measurement of mitochondrial parameters, both at the total level and the specific level per mitochondrial volume, using flow cytometry.

This study reports a novel approach to measure multiple mitochondrial functional parameters based on flow cytometry and double staining with two fluorescent reporters or antibodies to detect changes in mitochondrial volume, mitochondrial membrane potential, reactive oxygen species level, mitochondrial respiratory chain composition, and mitochondrial DNA.

Análisis citométrico de flujo de múltiples parámetros mitocondriales en células madre pluripotentes inducidas por humanos y sus derivados neuronales y gliales

Mitochondria are important in the pathophysiology of many neurodegenerative diseases. Changes in mitochondrial volume, mitochondrial membrane potential ...