Samantha Khoury y Pamela Ajuyah son compatibles con el Premio de Postgrado de Australia. También nos gustaría agradecer la Red de Investigación Traslacional del Cáncer, Centro de Investigación del Cáncer de Lowy, Universidad de Nueva Gales del Sur y la Unidad de Investigación Traslacional de Cáncer del Norte por su apoyo adicional de Samantha Khoury.

Nota: Las muestras de suero humano de pacientes sanos o pacientes con cáncer se obtuvieron con el consentimiento informado bajo protocolos éticos humanos aprobados desde el Royal Prince Alfred Hospital de Sydney (Número de protocolo X10-0016 y HREC/10/RPAH/24) y la Universidad de Tecnología, Sydney. Las muestras de suero se obtuvieron de los pacientes antes de la cirugía de diversos hospitales de Sydney y se colocan en almacenamiento a -80 ° C. 1. Pequeño aislamiento de ARN a partir de suero El ARN total se preparó a partir de suero humano usando una versión modificada del protocolo de LS Tri-Reactivo RT. <ol><li> Descongelar la muestra de suero congelado en hielo y luego transferir 400 l de suero recién descongelado en un tubo de microcentrífuga etiquetado. </li><li> Diluir el suero con 100 l de RNasa H 2 O y libre de agregar proteinasa K a una concentración de 1 mg / ml. </li><li> Incubar a 37 ° C durante 20 minutos para permitir la digestión de la proteína por la proteinasa K. </li><li> To asegurar la completa solubilización, añadir 1,5 veces su volumen de Tri-Reactivo RT LS y 100 l de 4-bromoanisol. </li><li> Brevemente invertir el homogeneizado, realice pipeteo repetitivo durante 5 segundos y transferir a un tubo de 2 ml pesada cerradura de la fase etiquetada. </li><li> Haga girar el homogeneizado a 12.000 × g durante 20 min a 4 ° C. </li><li> Decantar cuidadosamente al menos 1 ml de la solución acuosa resultante en un tubo de ADN LoBind fresco. La interfase orgánica y debe ser atrapado debajo el gel blanco del tubo de cerradura de la fase. </li><li> Añadir 5,0 l de glucógeno (5 mg / ml) y 500 l de isopropanol al 100% a la solución acuosa, mezclar por inversión e incubar O / N a -20 ° C. </li><li> Después de O / N de incubación, centrífuga la muestra durante 20 min a 12.000 x g en una centrífuga de 4 ° C. </li><li> Descartar el sobrenadante claro y efectuar un lanzamiento &quot;flash&quot; durante 2 minutos a 16.000 xg en un 4 ° C centrífuga. </li><li> Retire con cuidado el sol clarolución que rodea el sedimento usando una pipeta. </li><li> Lavar el pellet con 1 ml de etanol al 70% y se centrifuga a 10.000 × g durante 10 min. Decantar la solución de lavado y repetir el paso de lavado. </li></ol> 2. ARN resuspensión en solución <ol><li> Resuspender el precipitado en 10 l de RNasa H 2 O libre, asegurando el sedimento se disolvió completamente. Para garantizar que el ARN se solubiliza completamente la muestra se puede calentar a 55 ° C durante 5 min. Durante este tiempo, la mezcla de la muestra con pipeteo repetido. Para un mayor rendimiento total de ARN, aunar dos preparaciones de ARN de la misma paciente. </li><li> Cuantificar el ARN se resuspendió utilizando un espectrofotómetro UV-Vis y evaluar la calidad del ARN utilizando un 2100 Bioanalyzer. Almacenar las muestras de ARN agrupados a -80 ° C para su uso en aplicaciones posteriores. </li></ol>

<ol>
	<li>Babu, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Monitoring+extraction+efficiency+of+small+RNAs+with+the+Agilent+2100+Bioanalyzer+and+the+Small+RNA+Kit.">Monitoring extraction efficiency of small RNAs with the Agilent 2100 Bioanalyzer and the Small RNA Kit.</a> Agilent Application Note. , (2010).</li><li>Tran, N., Hutvagner, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Biogenesis+and+the+regulation+of+the+maturation+of+miRNAs.">Biogenesis and the regulation of the maturation of miRNAs.</a> Essays Biochem. 54, 17-28 (2013).</li><li>Chim, S. 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=Detection+and+characterization+of+placental+microRNAs+in+maternal+plasma.">Detection and characterization of placental microRNAs in maternal plasma.</a> Clin. Chem. 54, 482-490 (2008).</li><li>Lodes, M. J., 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=Detection+of+cancer+with+serum+miRNAs+on+an+oligonucleotide+microarray.">Detection of cancer with serum miRNAs on an oligonucleotide microarray.</a> PLoS One. 4, (2009).</li><li>Chen, X., 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=Characterization+of+microRNAs+in+serum:+a+novel+class+of+biomarkers+for+diagnosis+of+cancer+and+other+diseases.">Characterization of microRNAs in serum: a novel class of biomarkers for diagnosis of cancer and other diseases.</a> Cell Res. 18, 997-1006 (2008).</li><li>Burgos, K. L., 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=Identification+of+extracellular+miRNA+in+human+cerebrospinal+fluid+by+next-generation+sequencing.">Identification of extracellular miRNA in human cerebrospinal fluid by next-generation sequencing.</a> RNA. 19, 712-722 (2013).</li><li>Chomczynski, P., Sacchi, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Single-step+method+of+RNA+isolation+by+acid+guanidinium+thiocyanate-phenol-chloroform+extraction.">Single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction.</a> Anal. Biochem. 162, 156-159 (1987).</li><li>Zhang, X., 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=Alterations+in+miRNA+processing+and+expression+in+pleomorphic+adenomas+of+the+salivary+gland.">Alterations in miRNA processing and expression in pleomorphic adenomas of the salivary gland.</a> Int. J. Cancer. 124, 2855-2863 (2009).</li><li>Chomczynski, P., Sacchi, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+single-step+method+of+RNA+isolation+by+acid+guanidinium+thiocyanate-phenol-chloroform+extraction:+twenty-something+years+on.">The single-step method of RNA isolation by acid guanidinium thiocyanate-phenol-chloroform extraction: twenty-something years on.</a> Nat. Protoc. 1, 581-585 (2006).</li><li>Kirschner, M. B., 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=Haemolysis+during+sample+preparation+alters+microRNA+content+of+plasma.">Haemolysis during sample preparation alters microRNA content of plasma.</a> PLoS One. 6, (2011).</li><li>Murphy, N. R., Hellwig, R. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Improved+nucleic+acid+organic+extraction+through+use+of+a+unique+gel+barrier+material.">Improved nucleic acid organic extraction through use of a unique gel barrier material.</a> Biotechniques. 21, 934-936 (1996).</li><li>Taylor, C. J., Satoor, S. N., Ranjan, A. K., Pereira e Cotta, M. V., Joglekar, M. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+protocol+for+measurement+of+noncoding+RNA+in+human+serum.">A protocol for measurement of noncoding RNA in human serum.</a> Experimental Diabetes Research. 2012, (2012).</li><li>Ichikawa, M., Akiyama, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+Combination+of+Extraction+Reagent+and+DNA+Microarray+That+Allows+for+the+Detection+of+Global+MiRNA+Profiles+from+Serum/Plasma.">A Combination of Extraction Reagent and DNA Microarray That Allows for the Detection of Global MiRNA Profiles from Serum/Plasma.</a> Methods Mol. Biol. 1024, 247-253 (2013).</li><li>Fromm, B., Harris, P. D., Bachmann, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=MicroRNA+preparations+from+individual+monogenean+Gyrodactylus+salaris-a+comparison+of+six+commercially+available+totalRNA+extraction+kits.">MicroRNA preparations from individual monogenean Gyrodactylus salaris-a comparison of six commercially available totalRNA extraction kits.</a> BMC Res. Notes. 4, 217 (2011).</li><li>Li, Y., Kowdley, K. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Method+for+microRNA+isolation+from+clinical+serum+samples.">Method for microRNA isolation from clinical serum samples.</a> Anal. Biochem. 431, 69-75 (2012).</li><li>McAlexander, M. A., Phillips, M. J., Witwer, K. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Comparison+of+Methods+for+miRNA+Extraction+from+Plasma+and+Quantitative+Recovery+of+RNA+from+Cerebrospinal+Fluid.">Comparison of Methods for miRNA Extraction from Plasma and Quantitative Recovery of RNA from Cerebrospinal Fluid.</a> Frontiers in Genetics. 4, 83 (2013).</li><li>Kim, Y. K., Yeo, J., Kim, B., Ha, M., Kim, V. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Short+structured+RNAs+with+low+GC+content+are+selectively+lost+during+extraction+from+a+small+number+of+cells.">Short structured RNAs with low GC content are selectively lost during extraction from a small number of cells.</a> Mol. Cell. 46, 893-895 (2012).</li></ol>

No hay nada que revelar.

La población de microRNAs constituye aproximadamente el 0,4 a 0,5% del total de ARN que se encuentra en el suero. Además también hay un alto contenido de proteína que se encuentra en el suero humano. Para mejorar ARN y reducir tanto la proteína y fenol contamina hemos modificado el enfoque tradicional Chomczynski 9 con la adición de varios pasos. El ARN total se aisló a partir de suero utilizando el estándar de Tri-reactivo de RT-LS (Molecular Research Centre) sin embargo ...

En los últimos años, ha habido un creciente impulso para descubrir nuevos biomarcadores para la detección precoz de enfermedades humanas. Mucha atención se ha centrado en el uso de pequeños RNAs como microRNAs 2 (miRNAs o MIR) como marcadores potenciales. Estos pequeños RNAs se encuentran en los fluidos corporales tales como suero y los estudios han mostrado que son resistentes a la degradación y son estables en un intervalo de diferentes condiciones ambientales 3. Teniendo en cuenta estas características, suero o circulan miRNAs son el marcador ideal 4, 5. Actualmente hay dos enfoques principales para el aislamiento de ARN pequeño de los fluidos biológicos. El primer enfoque utiliza tecnología basada en columnas para atar y eluir los pequeños RNAs 6, mientras que el segundo enfoque utiliza el protocolo de larga data con fenol y tiocianato de guanidina reactivos 7. Hemos desarrollado un protocolo simple, eficaz, libre de columnas para aislar ARN pequeños a partir de suero humano. El ARN aislado es inmediatamentetamente utilizable en aplicaciones posteriores, incluyendo arrays de oligonucleótidos de ADN y la secuencia de ARN. Este protocolo fue desarrollado porque nos enfrentamos a varios problemas cuando se utilizan métodos basados ​​en fenol para aislar el ARN de suero. El enfoque tradicional Chomczynski se utiliza con frecuencia en la mayoría de laboratorios con una gama de reactivos disponibles de la mayoría de los proveedores comerciales. Sin embargo teniendo en cuenta su uso generalizado, las estrictas directrices no se han desarrollado para producir consistentemente ARN de alta calidad a partir de fluidos corporales, en sangre o suero particular. Los problemas comunes asociados con el aislamiento de ARN a partir de suero incluyen los rendimientos de ARN bajos y la contaminación con los reactivos utilizados durante el aislamiento, en particular fenol. Nuestro enfoque elimina estos contaminantes fenol para proporcionar ARN de alta calidad para el análisis de aguas abajo tal como la PCR cuantitativa (qPCR) y la secuenciación de ARN. Hemos probado más este ARN en arrays miARN.

<table border="0" cellpadding="0" cellspacing="0" style="width:852px;" width="851">
	<colgroup>
		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Name of the Material/Equipment&#160;</td>
			<td style="width:223px;">Company&#160;</td>
			<td style="width:123px;">Catalog Number&#160;</td>
			<td style="width:248px;">Comments/ Description (optional)&#160;</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Tri-Reagent RT LS</td>
			<td style="width:223px;">Molecular Research Centre, USA</td>
			<td style="width:123px;">TR 118</td>
			<td style="width:248px;">-</td>
		</tr>
		<tr height="26">
			<td height="26" style="height:26px;width:259px;">RNase free H20</td>
			<td style="width:223px;">GIBCO Invitrogen</td>
			<td style="width:123px;">10977-023</td>
			<td style="width:248px;">-</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Proteinase K&#160;</td>
			<td style="width:223px;">Finnzymes, Finland</td>
			<td style="width:123px;">EO0491</td>
			<td style="width:248px;">-</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Heavy Phaselock Tube</td>
			<td style="width:223px;">5PRIME</td>
			<td>2302830</td>
			<td style="width:248px;">2ml capacity</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">DNA Lobind tube</td>
			<td style="width:223px;">Eppendorf</td>
			<td style="width:123px;">0030 108.078</td>
			<td style="width:248px;">1.5ml capacity</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Glycogen&#160;</td>
			<td style="width:223px;">Invitrogen, USA</td>
			<td style="width:123px;">10814-010</td>
			<td style="width:248px;">5mg/ml</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">RNA grade Isopropanol&#160;</td>
			<td style="width:223px;">Sigma Aldrich, USA</td>
			<td style="width:123px;">I9516</td>
			<td style="width:248px;">100%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Refrigerated Centrifuge</td>
			<td style="width:223px;">John Morris</td>
			<td style="width:123px;">-</td>
			<td style="width:248px;">-</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Nanodrop UV-Vis spectrophotometer</td>
			<td style="width:223px;">Thermo Fisher Scientific, USA</td>
			<td style="width:123px;">-</td>
			<td style="width:248px;">-</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">RNA grade Ethanol</td>
			<td style="width:223px;">Sigma Aldrich, USA</td>
			<td style="width:123px;">E7023</td>
			<td style="width:248px;">70%</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:259px;">Agilent 2100 Bioanalyser</td>
			<td style="width:223px;">Agilent, USA</td>
			<td style="width:123px;">-</td>
			<td style="width:248px;">-</td>
		</tr>
	</tbody>
</table>

isolation of small noncoding rnas from human serum

El análisis de ARN y su expresión es una característica común en muchos laboratorios. De importancia es la aparición de pequeños RNAs como microARN, que se encuentran en células de mamífero. Estos pequeños RNAs son potentes reguladores de genes que controlan las vías vitales como el crecimiento, el desarrollo y la muerte y un gran interés se ha dirigido a su expresión en los fluidos corporales. Esto es debido a su desregulación en enfermedades humanas tales como el cáncer y su aplicación potencial como biomarcadores séricos. Sin embargo, el análisis de la expresión de los genes miARN en el suero puede ser problemático. En la mayoría de los casos, la cantidad de suero es limitante y el suero contiene bajas cantidades de ARN total, de los cuales los pequeños RNAs sólo constituyen 0,4-0,5% 1. Así, el aislamiento de cantidades suficientes de ARN de calidad a partir de suero es un gran desafío para los investigadores en la actualidad. En este documento técnico, se demuestra un método que utiliza solamente 400 l de suero humano para obtener suficiente ARN, ya sea para los arrays de ADN o análisis qPCR. El unV entajas de este método son su simplicidad y la capacidad para producir ARN de alta calidad. No requiere de columnas especializadas para la purificación de ARN pequeños y utiliza reactivos generales y hardware que se encuentran en los laboratorios comunes. Nuestro método utiliza un gel de bloqueo de fase para eliminar la contaminación de fenol mientras que al mismo tiempo produciendo ARN de alta calidad. También introducimos un paso adicional para quitar aún más todos los contaminantes durante la etapa de aislamiento. Este protocolo es muy eficaz en el aislamiento de los rendimientos de ARN total de hasta 100 ng / l de suero, pero también se puede adaptar para otros tejidos biológicos.

La figura 1 representa un típico espectro UV / Vis de ARN aislado a partir de suero. A partir de este perfil notamos la contaminación de proteínas a 280 nm con fenol y contaminantes orgánicos tanto a 270 nm y 230 nm, respectivamente. Residuo guanidinio tiocianato También se observó a 260 nm. Para reducir los contaminantes, se realizaron una serie de pasos de optimización para el procedimiento de RT-LS estándar de Tri-reactivo. Añadimos 5 mg / ml de glucógeno para aumentar tanto el rendimiento ...

Watch this Scientific Journal Video about Isolation of Small Noncoding RNAs from Human Serum at JoVE.com

Isolation of Small Noncoding RNAs from Human Serum

Este protocolo describe un método para la extracción de ARN pequeños a partir de suero humano. Hemos utilizado este método para aislar los microARNs de suero de cáncer para su uso en arrays de ADN y PCR cuantitativa singleplex. El protocolo utiliza fenol y tiocianato de guanidina reactivos con modificaciones para producir ARN de alta calidad.

El aislamiento de los pequeños RNAs no codificantes de suero humano

The analysis of RNA and its expression is a common feature in many laboratories. Of significance is the emergence of small RNAs like microRNAs, which are ...

isolation-of-small-noncoding-rnas-from-human-serum

Research

JoVE Journal

Biology

18.0K vistas.  University of Technology, Sydney.  Este protocolo describe un método para la extracción de ARN pequeños a partir de suero humano. Hemos utilizado este método para aislar los microARNs de suero de cáncer para su uso en arrays de ADN y PCR cuantitativa singleplex. El protocolo utiliza fenol y tiocianato de guanidina reactivos con modificaciones para producir ARN de alta calidad. 

Video: Isolation of Small Noncoding RNAs from Human Serum

Neuronal Nuclei Isolation from Human Postmortem Brain Tissue

Neurons in the human brain become postmitotic largely during prenatal development, and thus maintain their nuclei throughout the full lifespan. However, little is known about changes in neuronal chromatin and nuclear organization during the course of development and aging, or in chronic neuropsychiatric disease. However, to date most chromatin and DNA based assays (other than FISH) lack single cell resolution. To this end, the considerable cellular heterogeneity of brain tissue poses a significant limitation, because typically various subpopulations of neurons are intermingled with different types of glia and other non-neuronal cells. One possible solution would be to grow cell-type specific cultures, but most CNS cells, including neurons, are ex vivo sustainable, at best, for only a few weeks and thus would provide an incomplete model for epigenetic mechanisms potentially operating across the full lifespan.  Here, we provide a protocol to extract and purify nuclei from frozen (never fixed) human postmortem brain. The method involves extraction of nuclei in hypotonic lysis buffer, followed by ultracentrifugation and immunotagging with anti-NeuN antibody. Labeled neuronal nuclei are then collected separately using fluorescence-activated sorting. This method should be applicable to any brain region in a wide range of species and suitable for chromatin immunoprecipitation studies with site- and modification-specific anti-histone antibodies, and for DNA methylation and other assays. 

The cellular heterogeneity of brain tissue poses a significant limitation for the study of epigenetic markings in chromatin because most assays lack single cell resolution. Neurons typically are intermingled with glia and other non-neuronal cells. We provide a protocol to extract and collect neuronal nuclei from human brain.

Aislamiento de los núcleos neuronales a partir de tejido cerebral humano post-mortem

Neurons in the human brain become postmitotic largely during prenatal development, and thus maintain their nuclei throughout the full lifespan. However, ...

Investigación

Biología

Isolation of Stem Cells from Human Pancreatic Cancer Xenografts

Cancer stem cells (CSCs) have been identified in a growing number of malignancies and are functionally defined by their ability to undergo self-renewal and produce differentiated progeny1. These properties allow CSCs to recapitulate the original tumor when injected into immunocompromised mice. CSCs within an epithelial malignancy were first described in breast cancer and found to display specific cell surface antigen expression (CD44+CD24low/-)2. Since then, CSCs have been identified in an increasing number of other human malignancies using CD44 and CD24 as well as a number of other surface antigens. Physiologic properties, including aldehyde dehydrogenase (ALDH) activity, have also been used to isolate CSCs from malignant tissues3-5.
Recently, we and others identified CSCs from pancreatic adenocarcinoma based on
ALDH activity and the expression of the cell surface antigens CD44 and CD24, and CD1336-8. These highly tumorigenic populations may or may not be overlapping and display other functions. We found that ALDH+ and CD44+CD24+ pancreatic CSCs are similarly tumorigenic, but ALDH+ cells are relatively more invasive8. In this protocol we describe a method to isolate viable pancreatic CSCs from low-passage human
xenografts9. Xenografted tumors are harvested from mice and made into a single-cell suspension. Tissue debris and dead cells are separated from live cells and then stained using antibodies against CD44 and CD24 and using the ALDEFLUOR reagent,
a fluorescent substrate of ALDH10. CSCs are then isolated by fluorescence activated cell sorting. Isolated CSCs can then be used for analytical or functional assays requiring viable cells.

Cancer stem cells (CSCs) have been identified in a number of malignancies. In this protocol we describe a flow cytometric method utilizing aldehyde dehydrogenase activity and CD44 and CD24 expression to isolate CSCs from human pancreatic adenocarcinoma xenografts. These viable cells can then be used in functional and analytical studies.

El aislamiento de células madre de cáncer de páncreas xenoinjertos

Cancer stem cells (CSCs) have been identified in a growing number of malignancies and are functionally defined by their ability to undergo self-renewal ...

Isolation and Culture of Adult Epithelial Stem Cells from Human Skin

The homeostasis of all self-renewing tissues is dependent on adult stem cells. As undifferentiated stem cells undergo asymmetric divisions, they generate daughter cells that retain the stem cell phenotype and transit-amplifying cells (TA cells) that migrate from the stem cell niche, undergo rapid proliferation and terminally differentiate to repopulate the tissue.
Epithelial stem cells have been identified in the epidermis, hair follicle, and intestine as cells with a high in vitro proliferative potential and as slow-cycling label-retaining cells in vivo 1-3. Adult, tissue-specific stem cells are responsible for the regeneration of the tissues in which they reside during normal physiologic turnover as well as during times of stress 4-5. Moreover, stem cells are generally considered to be multi-potent, possessing the capacity to give rise to multiple cell types within the tissue 6. For example, rodent hair follicle stem cells can generate epidermis, sebaceous glands, and hair follicles 7-9. We have shown that stem cells from the human hair follicle bulge region exhibit multi-potentiality 10.
Stem cells have become a valuable tool in biomedical research, due to their utility as an in vitro system for studying developmental biology, differentiation, tumorigenesis and for their possible therapeutic utility. It is likely that adult epithelial stem cells will be useful in the treatment of diseases such as ectodermal dysplasias, monilethrix, Netherton syndrome, Menkes disease, hereditary epidermolysis bullosa and alopecias 11-13. Additionally, other skin problems such as burn wounds, chronic wounds and ulcers will benefit from stem cell related therapies 14,15. Given the potential for reprogramming of adult cells into a pluripotent state (iPS cells)16,17, the readily accessible and expandable adult stem cells in human skin may provide a valuable source of cells for induction and downstream therapy for a wide range of disease including diabetes and Parkinson's disease.

A rapid, robust way of isolating viable adult epithelial stem cells from human skin is described. The method utilizes enzymatic digestion of skin collagen matrix , followed by plucking of hair follicles and isolation of single cell suspensions or tissue fragments for cell culture.

Aislamiento y cultivo de células madre adultas epiteliales de la piel humana

The homeostasis of all self-renewing tissues is dependent on adult stem cells. As undifferentiated stem cells undergo asymmetric divisions, they generate ...

Efficient Derivation of Human Cardiac Precursors and Cardiomyocytes from Pluripotent Human Embryonic Stem Cells with Small Molecule Induction

To date, the lack of a suitable human cardiac cell source has been the major setback in regenerating the human myocardium, either by cell-based transplantation or by cardiac tissue engineering1-3. Cardiomyocytes become terminally-differentiated soon after birth and lose their ability to proliferate. There is no evidence that stem/progenitor cells derived from other sources, such as the bone marrow or the cord blood, are able to give rise to the contractile heart muscle cells following transplantation into the heart1-3. The need to regenerate or repair the damaged heart muscle has not been met by adult stem cell therapy, either endogenous or via cell delivery1-3. The genetically stable human embryonic stem cells (hESCs) have unlimited expansion ability and unrestricted plasticity, proffering a pluripotent reservoir for in vitro derivation of large supplies of human somatic cells that are restricted to the lineage in need of repair and regeneration4,5. Due to the prevalence of cardiovascular disease worldwide and acute shortage of donor organs, there is intense interest in developing hESC-based therapies as an alternative approach. However, how to channel the wide differentiation potential of pluripotent hESCs efficiently and predictably to a desired phenotype has been a major challenge for both developmental study and clinical translation. Conventional approaches rely on multi-lineage inclination of pluripotent cells through spontaneous germ layer differentiation, resulting in inefficient and uncontrollable lineage-commitment that is often followed by phenotypic heterogeneity and instability, hence, a high risk of tumorigenicity6-8 (see a schematic in Fig. 1A). In addition, undefined foreign/animal biological supplements and/or feeders that have typically been used for the isolation, expansion, and differentiation of hESCs may make direct use of such cell-specialized grafts in patients problematic9-11. To overcome these obstacles, we have resolved the elements of a defined culture system necessary and sufficient for sustaining the epiblast pluripotence of hESCs, serving as a platform for de novo derivation of clinically-suitable hESCs and effectively directing such hESCs uniformly towards clinically-relevant lineages by small molecules12 (see a schematic in Fig. 1B). After screening a variety of small molecules and growth factors, we found that such defined conditions rendered nicotinamide (NAM) sufficient to induce the specification of cardiomesoderm direct from pluripotent hESCs that further progressed to cardioblasts that generated human beating cardiomyocytes with high efficiency (Fig. 2). We defined conditions for induction of cardioblasts direct from pluripotent hESCs without an intervening multi-lineage embryoid body stage, enabling well-controlled efficient derivation of a large supply of human cardiac cells across the spectrum of developmental stages for cell-based therapeutics.

We have established a protocol for induction of cardioblasts direct from pluripotent human embryonic stem cells maintained under defined conditions with small molecules, which enables derivation of a large supply of human cardiac progenitors and functional cardiomyocytes for cardiovascular repair.

Derivación eficiente de los Derechos Humanos precursores cardiacos y cardiomiocitos de pluripotentes células madre embrionarias humanas mediante la inducción de moléculas pequeñas

To date, the lack of a suitable human cardiac cell source has been the major setback in regenerating the human myocardium, either by cell-based ...

Manual Isolation of Adipose-derived Stem Cells from Human Lipoaspirates

In 2001, researchers at the University of California, Los Angeles, described the isolation of a new population of adult stem cells from liposuctioned adipose tissue that they initially termed Processed Lipoaspirate Cells or PLA cells. Since then, these stem cells have been renamed as Adipose-derived Stem Cells or ASCs and have gone on to become one of the most popular adult stem cells populations in the fields of stem cell research and regenerative medicine. Thousands of articles now describe the use of ASCs in a variety of regenerative animal models, including bone regeneration, peripheral nerve repair and cardiovascular engineering. Recent articles have begun to describe the myriad of uses for ASCs in the clinic. The protocol shown in this article outlines the basic procedure for manually and enzymatically isolating ASCs from large amounts of lipoaspirates obtained from cosmetic procedures. This protocol can easily be scaled up or down to accommodate the volume of lipoaspirate and can be adapted to isolate ASCs from fat tissue obtained through abdominoplasties and other similar procedures.

In 2001, researchers at UCLA described the isolation of a population of adult stem cells, termed Adipose-derived Stem Cells or ASCs, from adipose tissue. This article outlines the isolation of ASCs from lipoaspirates using a manual, enzymatic digestion protocol using collagenase.

Aislamiento Manual de células madre derivadas de tejido adiposo de Lipoaspirates Humanos

In 2001, researchers at the University of  California, Los Angeles, described the isolation of a new population of adult  stem cells from liposuctioned ...

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

The myofibroblast is a stromal cell of the gastrointestinal (GI) tract that has been gaining considerable attention for its critical role in many GI functions. While several myofibroblast cell lines are commercially available to study these cells in vitro, research results from a cell line exposed to experimental cell culture conditions have inherent limitations due to the overly reductionist nature of the work. Use of primary myofibroblasts offers a great advantage in terms of confirming experimental findings identified in a cell line. Isolation of primary myofibroblasts from an animal model allows for the study of myofibroblasts under conditions that more closely mimic the disease state being studied. Isolation of primary myofibroblasts from human colon tissue provides arguably the most relevant experimental data, since the cells come directly from patients with the underlying disease. We describe a well-established technique that can be utilized to isolate primary myofibroblasts from both mouse and human colon tissue. These isolated cells have been characterized to be alpha-smooth muscle actin and vimentin-positive, and desmin-negative, consistent with subepithelial intestinal myofibroblasts. Primary myofibroblast cells can be grown in cell culture and used for experimental purposes over a limited number of passages.

The myofibroblast is an influential stromal cell of the gastrointestinal tract that regulates important physiologic processes in both normal and disease states. We describe a technique that allows for the isolation of primary myofibroblasts from both mouse and human colon tissue, which can be utilized for in vitro experimentation.

Aislamiento de Miofibroblastos primarias de ratón y el tejido del colon humano

The myofibroblast is  a stromal cell of the gastrointestinal (GI) tract that has been gaining  considerable attention for its critical role in many GI ...

Isolation of Myofibroblasts from Mouse and Human Esophagus

Murine and human esophageal myofibroblasts are generated via enzymatic digestion. Neonate (8-12 day old) murine esophagus is harvested, minced, washed, and subjected to enzymatic digestion with collagenase and dispase for 25 min. Human esophageal resection specimens are stripped of muscularis propria and adventitia and the remaining mucosa is minced, and subjected to enzymatic digestion with collagenase and dispase for up to 6 hr. Cultured cells express &#945;-SMA and vimentin and express desmin weakly or not at all. Culture conditions are not conducive to growth of epithelial, hematopoietic, or endothelial cells. Culture purity is further confirmed by flow cytometric evaluation of cell surface marker expression of potential contaminating hematopoietic and endothelial cells. The described technique is straightforward and results in consistent generation of non-hematopoieitc, non-endothelial stromal cells. Limitations of this technique are inherent to the use of primary cultures in molecular biology studies, i.e., the unavoidable variability encountered among cultures established across different mice or humans. Primary cultures however are a more representative reflection of the in vivo state compared to cell lines. These methods also provide investigators the ability to isolate and culture stromal cells from different clinical and experimental conditions, allowing comparisons between groups. Characterized esophageal stromal cells can also be used in functional studies investigating epithelial-stromal interactions in esophageal disorders.

We present a protocol to generate primary cultures of murine and human esophageal stromal cells with a myofibroblast phenotype. Cultured cells have spindle shaped morphology, express &#945;-SMA and vimentin, and lack epithelial, hematopoietic and endothelial cell surface markers. Characterized stromal cells can be used in functional studies of epithelial-stromal interactions.

Aislamiento de Miofibroblastos de Mouse y Esófago Humano

Murine and human esophageal myofibroblasts are generated via enzymatic digestion. Neonate (8-12 day old) murine esophagus is harvested, minced, washed, ...

Isolation of Human Ventricular Cardiomyocytes from Vibratome-Cut Myocardial Slices

The isolation of ventricular cardiac myocytes from animal and human hearts is a fundamental method in cardiac research. Animal cardiomyocytes are commonly isolated by coronary perfusion with digestive enzymes. However, isolating human cardiomyocytes is challenging because human myocardial specimens usually do not allow for coronary perfusion, and alternative isolation protocols result in poor yields of viable cells. In addition, human myocardial specimens are rare and only regularly available at institutions with on-site cardiac surgery. This hampers the translation of findings from animal to human cardiomyocytes. Described here is a reliable protocol that enables efficient isolation of ventricular myocytes from human and animal myocardium. To increase the surface-to-volume ratio while minimizing cell damage, myocardial tissue slices 300 &#181;m thick are generated from myocardial specimens with a vibratome. Tissue slices are then digested with protease and collagenase. Rat myocardium was used to establish the protocol and quantify yields of viable, calcium-tolerant myocytes by flow-cytometric cell counting. Comparison with the commonly used tissue-chunk method showed significantly higher yields of rod-shaped cardiomyocytes (41.5 &#177; 11.9 vs. 7.89 &#177; 3.6%, p &#60; 0.05). The protocol was translated to failing and non-failing human myocardium, where yields were similar as in rat myocardium and, again, markedly higher than with the tissue-chunk method (45.0 &#177; 15.0 vs. 6.87 &#177; 5.23 cells/mg, p &#60; 0.05). Notably, with the protocol presented it is possible to isolate reasonable numbers of viable human cardiomyocytes (9&#8211;200 cells/mg) from minimal amounts of tissue (&#60;50 mg). Thus, the method is applicable to healthy and failing myocardium from both human and animal hearts. Furthermore, it is possible to isolate excitable and contractile myocytes from human tissue specimens stored for up to 36 h in cold cardioplegic solution, rendering the method particularly useful for laboratories at institutions without on-site cardiac surgery.

Presented is a protocol for the isolation of human and animal ventricular cardiomyocytes from vibratome-cut myocardial slices. High yields of calcium-tolerant cells (up to 200 cells/mg) can be obtained from small amounts of tissue (&#60;50 mg). The protocol is applicable to myocardium exposed to cold ischemia for up to 36 h.

Aislamiento de cardiomiocitos ventriculares humanos de rebanadas de miocardio de corte de vibratome

The isolation of ventricular cardiac myocytes from animal and human hearts is a fundamental method in cardiac research. Animal cardiomyocytes are commonly ...

Isolation of Human Neutrophils from Whole Blood and Buffy Coats

Neutrophils (PMNs) are the most abundant leukocytes in human circulation, ranging from 40 to 70% of total blood leukocytes. They are the first cells recruited at the site of inflammation via rapid extravasation through vessels. There, neutrophils perform an array of functions to kill invading pathogens and mediate immune signaling. Freshly purified neutrophils from human blood are the model of choice for study, as no cell line fully replicates PMN functions and biology. However, neutrophils are short-lived, terminally differentiated cells and are highly susceptible to activation in response to physical (temperature, centrifugation speed) and biological (endotoxin, chemo- and cytokines) stimuli. Therefore, it is crucial to follow a standardized, reliable, and fast method to obtain pure and non-activated cells. This protocol presents an updated protocol combining density gradient centrifugation, red blood cell (RBC) sedimentation, and RBC lysis to obtain high PMN purity and minimize cell activation. Furthermore, methods to assess neutrophil isolation quality, viability, and purity are also discussed.

This protocol details a method for the isolation of neutrophils from whole blood, buffy coats, or leukapheresis membranes, achieving good yield, high purity, and minimal cell activation. We utilize gradient purification, red blood cell (RBC) sedimentation, and RBC lysis to obtain a high-quality/purity neutrophil preparation.

Aislamiento de neutrófilos humanos de sangre entera y buffy coats

Neutrophils (PMNs) are the most abundant leukocytes in human circulation, ranging from 40 to 70% of total blood leukocytes. They are the first cells ...

Isolation of Epithelial Cells from Human Dental Follicle

The dental follicle (DF) was harvested during the removal of an impacted third molar by an oral maxillofacial surgeon. Epithelial cell isolation was performed on the day of DF harvest. The DF was washed three times with DPBS and then dissected with tissue scissors until the tissue had a pulpy or squishy consistency. Single-cell populations were pelleted by centrifugation and washed with keratinocyte serum-free medium. Heterogeneous cell populations were distributed in a culture dish. Keratinocyte serum-free medium was used to select the epithelial cells. The culture medium was changed daily until no floating debris or dead cells were observed. Epithelial cells appeared within 7-10 days after cell population distribution. Epithelial cells survived in serum-free medium, while &#945;-modification minimal essential medium supplemented with 10% fetal bovine serum allowed the proliferation of mesenchymal-type cells. The DF is a tissue source for the isolation of dental epithelial cells.
The purpose of this study was to establish a method for the isolation of epithelial cells from human DF. Periodontal ligament (PDL) was used for the isolation of human dental epithelial cells. Procuring epithelial cells from human PDL is not always successful due to the small tissue volume, leading to low numbers of epithelial cells. DF has a larger volume than PDL and contains more cells. DF can be a tissue source for the primary culture of human dental epithelial cells. This protocol is easier and more efficient than the isolation method using PDL. Procuring human dental epithelial cells may facilitate further studies of dental epithelial-mesenchymal interactions.

The dental follicle contains an epithelial population and mesenchymal cells. The epithelial population was selected from the heterogeneous dental follicle cell population by providing a distinct culture medium. Epithelial cells survived and formed colonies in a serum-free medium.

Aislamiento de células epiteliales del folículo dental humano

The dental follicle (DF) was harvested during the removal of an impacted third molar by an oral maxillofacial surgeon. Epithelial cell isolation was ...