We would like to thank Henriette Mair-Meijers for invaluable attention to detail and hours devoted to processing the blood collections. We are grateful for the graphic design expertise of Natalie Jameson Kiesling. We also appreciate the approval of the manufacturers (Qiagen (Valencia, CA), BD Biosciences (San Jose, CA), Life Technologies (Grand Island, NY)) mentioned herein to publish the use of their products as described. Funding for this work was generously provided by the National Institutes of Health award numbers DA022720, RC1MH088283, and DA022720-05-S1.

<ol>
	<li>Hernandez, M. E., Martinez-Fong, D., Perez-Tapia, M., Estrada-Garcia, I., Estrada-Parra, S., Pavon, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Evaluation+of+the+effect+of+selective+serotonin-reuptake+inhibitors+on+lymphocyte+subsets+in+patients+with+a+major+depressive+disorder.">Evaluation of the effect of selective serotonin-reuptake inhibitors on lymphocyte subsets in patients with a major depressive disorder.</a> Eur Neuropsychopharmacol. 20, 88-95 (2010).</li><li>Weigelt, K., 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=TREM-1+and+DAP12+expression+in+monocytes+of+patients+with+severe+psychiatric+disorders+EGR3,+ATF3+and+PU.1+as+important+transcription+factors.">TREM-1 and DAP12 expression in monocytes of patients with severe psychiatric disorders EGR3, ATF3 and PU.1 as important transcription factors.</a> Brain Behav Immun. 25, 1162-1169 (2011).</li><li>Robertson, 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=Lymphocyte+subset+differences+in+patients+with+chronic+fatigue+syndrome,+multiple+sclerosis+and+major+depression.">Lymphocyte subset differences in patients with chronic fatigue syndrome, multiple sclerosis and major depression.</a> Clin Exp Immunol. 141, 326-332 (2005).</li><li>Rotter, A., Asemann, R., Decker, A., Kornhuber, J., Biermann, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Orexin+expression+and+promoter-methylation+in+peripheral+blood+of+patients+suffering+from+major+depressive+disorder.">Orexin expression and promoter-methylation in peripheral blood of patients suffering from major depressive disorder.</a> J Affect Disord. 131, 186-192 (2011).</li><li>Klengel, T., 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=Allele-specific+FKBP5+DNA+demethylation+mediates+gene-childhood+trauma+interactions.">Allele-specific FKBP5 DNA demethylation mediates gene-childhood trauma interactions.</a> Nat Neurosci. 16, 33-41 (2013).</li><li>Segman, R. H., Shefi, N., Goltser-Dubner, T., Friedman, N., Kaminski, N., Shalev, A. Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Peripheral+blood+mononuclear+cell+gene+expression+profiles+identify+emergent+post-traumatic+stress+disorder+among+trauma+survivors.">Peripheral blood mononuclear cell gene expression profiles identify emergent post-traumatic stress disorder among trauma survivors.</a> Mol Psychiatry. 10, 500-513 (2005).</li><li>Smith, B. H., 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=Cohort+Profile:+Generation+Scotland:+Scottish+Family+Health+Study+(GS:SFHS).+The+study,+its+participants+and+their+potential+for+genetic+research+on+health+and+illness.">Cohort Profile: Generation Scotland: Scottish Family Health Study (GS:SFHS). The study, its participants and their potential for genetic research on health and illness.</a> Int J Epidemiol. 42, 689-700 (2013).</li><li>Mallone, 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+preservation+of+peripheral+blood+mononuclear+cells+for+analysis+of+islet+antigen-reactive+T+cell+responses:+position+statement+of+the+T-Cell+Workshop+Committee+of+the+Immunology+of+Diabetes+Society.">Isolation and preservation of peripheral blood mononuclear cells for analysis of islet antigen-reactive T cell responses: position statement of the T-Cell Workshop Committee of the Immunology of Diabetes Society.</a> Clin Exp Immunol. 163, 33-49 (2011).</li><li>Duvigneau, J. C., Hartl, R. T., Teinfalt, M., Gemeiner, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Delay+in+processing+porcine+whole+blood+affects+cytokine+expression.">Delay in processing porcine whole blood affects cytokine expression.</a> J Immunol Methods. 272, 11-21 (2003).</li><li>Debey, 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=Comparison+of+different+isolation+techniques+prior+gene+expression+profiling+of+blood+derived+cells:+impact+on+physiological+responses,+on+overall+expression+and+the+role+of+different+cell+types.">Comparison of different isolation techniques prior gene expression profiling of blood derived cells: impact on physiological responses, on overall expression and the role of different cell types.</a> Pharmacogenomics J. 4, 193-207 (2004).</li><li>Uddin, 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=Epigenetic+and+immune+function+profiles+associated+with+posttraumatic+stress+disorder.">Epigenetic and immune function profiles associated with posttraumatic stress disorder.</a> Proc Natl Acad Sci U S A. 107, 9470-9475 (2010).</li><li>Kessler, R. C., Wang, P. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+descriptive+epidemiology+of+commonly+occurring+mental+disorders+in+the+United+States.">The descriptive epidemiology of commonly occurring mental disorders in the United States.</a> Annu Rev Public Health. 29, 115-129 (2008).</li><li>. QIAamp&#174; DNA Mini and Blood Mini Handbook Available from: <a target="_blank" href="https://www.qiagen.com/us/resources/resourcedetail?id=67893a91-946f-49b5-8033-394fa5d752ea">https://www.qiagen.com/us/resources/resourcedetail?id=67893a91-946f-49b5-8033-394fa5d752ea</a> (2010)</li><li>Koenen, 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=SLC6A4+methylation+modifies+the+effect+of+the+number+of+traumatic+events+on+risk+for+posttraumatic+stress+disorder.">SLC6A4 methylation modifies the effect of the number of traumatic events on risk for posttraumatic stress disorder.</a> Depress Anxiety. 28, 639-647 (2011).</li><li>Walsh, K., Uddin, M., Soliven, R., Wildman, D. E., Bradley, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Associations+between+the+SS+variant+of+5-HTTLPR+and+PTSD+among+adults+with+histories+of+childhood+emotional+abuse:+Results+from+two+African+American+independent+samples.">Associations between the SS variant of 5-HTTLPR and PTSD among adults with histories of childhood emotional abuse: Results from two African American independent samples.</a> J Affect Disord. 161, 91-96 (2014).</li><li>Bustamante, A. 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=Childhood+maltreatment+is+associated+with+epigenetic+differences+in+hypothalamic-pituitary-adrenal+(HPA)+axis+genes+in+the+Detroit+Neighborhood+Health+Study.">Childhood maltreatment is associated with epigenetic differences in hypothalamic-pituitary-adrenal (HPA) axis genes in the Detroit Neighborhood Health Study.</a> , (2013).</li><li>Sipahi, 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=Longitudinal+epigenetic+variation+of+DNA+methyltransferase+genes+is+associated+with+vulnerability+to+post-traumatic+stress+disorder.">Longitudinal epigenetic variation of DNA methyltransferase genes is associated with vulnerability to post-traumatic stress disorder.</a> Psychol Med. 44, 3165-3179 (2014).</li><li>Uddin, M., Koenen, K. C., Aiello, A. E., Wildman, D., de los Santos, R., Galea, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Epigenetic+and+inflammatory+marker+profiles+associated+with+depression+in+a+community-based+epidemiologic+sample.">Epigenetic and inflammatory marker profiles associated with depression in a community-based epidemiologic sample.</a> Psychol Med. 41, 997-1007 (2011).</li><li>Uddin, 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=Post-traumatic+stress+disorder+is+associated+with+immunosenescent+T+cell+phenotypes+in+the+Detroit+Neighborhood+Health+Study.">Post-traumatic stress disorder is associated with immunosenescent T cell phenotypes in the Detroit Neighborhood Health Study.</a> , (2011).</li><li>Uddin, 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=Post-traumatic+stress+disorder+is+associated+with+immunosenescent+T+cell+phenotypes+in+the+Detroit+Neighborhood+Health+Study.">Post-traumatic stress disorder is associated with immunosenescent T cell phenotypes in the Detroit Neighborhood Health Study.</a> , (2011).</li><li>Uddin, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Biological+signatures+of+post-traumatic+stress+disorder+in+the+Detroit+Neighborhood+Health+Study.">Biological signatures of post-traumatic stress disorder in the Detroit Neighborhood Health Study.</a> , (2010).</li><li>Aiello, A. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cytomegalovirus+antibodies+as+a+marker+of+immunosenescence+in+the+Detroit+Neighborhood+Health+Study.">Cytomegalovirus antibodies as a marker of immunosenescence in the Detroit Neighborhood Health Study.</a> , (2010).</li><li>Bustamante, A. 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=.">.</a> Distinct gene expression profiles characterize lifetime PTSD and childhood maltreatment in the Detroit Neighborhood Health Study. , (2013).</li></ol>

Les auteurs déclarent qu&#39;ils ont aucun conflit d&#39;intérêts.

Nous avons décrit un protocole simplifié qui a été appliquée avec succès pour traiter plus de 1.600 échantillons de sang total dans l&#39;étude de la santé Detroit Quartier. Bien que nombre de ces techniques sont disponibles dans la littérature existante, notre compilation étape par étape, y compris les modifications chronométrés précisément entre chaque étape, reflète une optimisée, le protocole efficace qui produit avec succès une variété de spécimens biologiques avec une large gamme d&#39;appli...

De multiples études ont caractérisé les différences d&#39;expression génique, méthylation de l&#39;ADN et de sous-ensemble de cellules dans le sang chez les personnes avec et sans mentale (ou autre) des maladies 1-4. Ces études, cependant, ont été obtenus à partir des paramètres cliniques dans lesquels les différences associées à des maladies peuvent être amplifiées en raison de la nature généralement plus sévère des maladies pour lesquelles les patients sont à la recherche de traitement. Grâce aux progrès de «omiques» les approches, la dernière décennie a vu une explosion d&#39;intérêt pour obtenir des échantillons biologiques à partir de paramètres épidémiologiques 5-7 communauté et / ou, dans le but de fournir des estimations fondées sur la population de prévalence de la maladie et une image plus large de la déterminants environnementaux de ces maladies mentales et / ou physiques. Un défi clé à cet égard est l&#39;obligation pour le traitement rapide des échantillons prélevés. La dégradation des cellules mononucléaires, des composants du système immunitaire qui sont frequentl clésy utilisé pour évaluer la santé d&#39;un individu, commence immédiatement après la prise de sang avec une diminution significative de la récupération après 2 heures de la collecte 8-10. Pour relever ce défi, nous présentons un protocole optimisé dans lequel de multiples composants de sang humain entier sont simultanément isolés à partir d&#39;échantillons obtenus dans les maisons de sujets vivant dans une grande région métropolitaine. Le protocole est basé sur notre compilation et la modification des techniques actuelles, y compris le stockage de toutes les fractions «extra» dans le cas des techniques futures permettent davantage d&#39;isolement / analyse. Bien que les méthodes ou des kits de remplacement peuvent être utilisés à la place des méthodes individuelles décrites ici, ceux décrits se sont révélés être un moyen fiable et efficace pour le traitement des échantillons de manière à haut débit. Fractions de haute qualité (CMSP, l&#39;ADN, sérum, et ARN) de sang frais peuvent être produites dans les 2 heures de collecte et de tous les spécimens d&#39;analyse prêts peuvent être disponibles dans les 2 jours (Figure 1). Ce protocole a été développé pour permettre le traitement efficace des échantillons prélevés dans la communauté-logement, les résidents adultes de la ville de Detroit pour les essais dans le Health Study Quartier Detroit (DNHS; DA022720, RC1MH088283, DA022720-05-S1), un repose-population étude des déterminants sociaux et biologiques du trouble de stress post-traumatique (SSPT) et d&#39;autres maladies mentales. La prévalence du SSPT dans Detroit est plus de deux fois la moyenne nationale 11,12. Identifier les déterminants biologiques de stress post-traumatique dans cette population peut aider à développer pharmacologique approprié et / ou interventions cognitivo-comportementales pour aider ceux qui souffrent de la maladie, à la fois dans cette population urbaine, et dans d&#39;autres populations à haut risque (par exemple, le retour des vétérans militaires). Notre laboratoire, précédemment situé à Wayne State University de Detroit, au Michigan, a été choisi pour le traitement basée sur notre expertise dans la manipulation des échantillons de tissus frais dérivés d&#39;une variétédes sources, la nécessité de commencer à traiter les échantillons dans les 2 heures de la collecte, et notre proximité avec les sites de collecte. Avec cette occasion unique à portée de main, notre objectif était d&#39;optimiser le traitement pour le plus grand rendement de l&#39;ADN, l&#39;ARN, le sérum et des cellules mononucléées du sang périphérique (CMSP) de chaque spécimen (un total de N = 1.639 échantillons de plus de 5 vagues de collecte de l&#39;échantillon). Les procédures décrites ici peuvent être effectuées simultanément dans un cadre non-clinique, produisant ainsi un matériau (voir le tableau 1 pour les rendements moyens) de départ pour une multitude d&#39;applications en aval, y compris microréseau, épigénétique, en temps réel RT-PCR et cytométrie de flux analyses. <img alt="Figure 1" src="/files/ftp_upload/52227/52227fig1highres.jpg" width="700" /> Figure 1. flux de travail global. Le processus global représenté ici comprend la logistique de l&#39;obtention des échantillons de sang de l&#39;identification partic consentantspants au sang se dessinent. De haute qualité, des fractions (cellules mononucléaires du sang périphérique; PBMC, de l&#39;ADN, le sérum, et de l&#39;ARN) de sang entier frais peut être produite à l&#39;intérieur de 2 heures et collecte tous les échantillons d&#39;essai en main peut être disponible dans les 2 jours. En outre, les fractions préparées par ce procédé conviennent pour le stockage à long terme ne sont pas si les échantillons à tester immédiatement. L&#39;ensemble du calendrier décrite ici pourrait être achevée en une seule journée (~ 5 h total). Cependant, une telle journée serait extrêmement laborieux surtout pour un seul technicien avec expérience considérable avec les techniques. Ainsi, nous recommandons de diviser les procédures le jour 1 entre au moins deux techniciens et l&#39;achèvement du traitement de l&#39;ARN du Jour 2. <a href="https://www.jove.com/files/ftp_upload/52227/52227fig1highres.jpg" target="_blank">S&#39;il vous plaît cliquer ici pour voir une version plus grande de cette figure.</a>

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>QIAamp DNA Blood Mini Kit</td>
			<td>Qiagen</td>
			<td>51104</td>
			<td>Day 1: DNA isolation</td>
		</tr>
		<tr>
			<td>Phosphate-buffered saline (PBS)</td>
			<td>Sigma</td>
			<td>P5493-1L</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>5 &#190;&#8221; Pasteur pipets</td>
			<td>Fisher</td>
			<td>13-678-6A</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>Fetal Bovine Serum (FBS), heat inactivated</td>
			<td>Life Technologies</td>
			<td>10082147</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>Dimethyl Sulfoxide (DMSO)</td>
			<td>Sigma</td>
			<td>D8418-500ml</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>RPMI Medium 1640, liquid</td>
			<td>Invitrogen</td>
			<td>11875119</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>0.4% trypan blue stain&#160;</td>
			<td>Invitrogen</td>
			<td>T10282</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>Countess Cell Counting Chamber</td>
			<td>Invitrogen</td>
			<td>C10283</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>Countess Automated Cell Counter or cell counting device such as a microscope and hemocytometer</td>
			<td>Invitrogen</td>
			<td>C10281</td>
			<td>Day 1: PBMC isolation</td>
		</tr>
		<tr>
			<td>LeukoLOCK Fractionation &#38; Stabilization Kit&#160;</td>
			<td>Ambion</td>
			<td>1933</td>
			<td>Day 1: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>25G x 5/8 in. needles</td>
			<td>Becton Dickinson</td>
			<td>305122</td>
			<td>Day 1: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>Syringes (5ml)</td>
			<td>Becton Dickinson</td>
			<td>309646</td>
			<td>Days 1 and 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>Denaturing Lysis Solution&#160;</td>
			<td>Ambion</td>
			<td>8540G</td>
			<td>Day 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>5M NaCl</td>
			<td>Life Technologies</td>
			<td>24740011</td>
			<td>Day 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>TRI Reagent&#160;</td>
			<td>Ambion</td>
			<td>9738</td>
			<td>Day 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>Bromo-3-chloro-propane (BCP)</td>
			<td>Sigma</td>
			<td>B-9673</td>
			<td>Day 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>spin cartridges&#160;</td>
			<td>Ambion</td>
			<td>10051G</td>
			<td>Day 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>0.1mM EDTA</td>
			<td>Ambion</td>
			<td>9912</td>
			<td>Day 2: Leukocyte RNA isolation</td>
		</tr>
		<tr>
			<td>DNA-free Kit</td>
			<td>Ambion</td>
			<td>AM1960</td>
			<td>Day 2: DNase treament</td>
		</tr>
		<tr>
			<td>RNA 6000 Ladder&#160;</td>
			<td>Agilent</td>
			<td>5067-1529</td>
			<td>Day 2: Bioanalyzer analysis</td>
		</tr>
		<tr>
			<td>RNA 6000 Nano Series II Kit&#160;</td>
			<td>Agilent</td>
			<td>5067-1511</td>
			<td>Day 2: Bioanalyzer analysis</td>
		</tr>
		<tr>
			<td>RNaseZAP</td>
			<td>Ambion</td>
			<td>AM8782</td>
			<td>Day 2: Bioanalyzer analysis</td>
		</tr>
		<tr>
			<td>Ethanol &#62;99%</td>
			<td>Sigma</td>
			<td>E7023-500ml</td>
			<td></td>
		</tr>
		<tr>
			<td>Isopropanol &#62;99%&#160;</td>
			<td>Sigma</td>
			<td>I9516-500ml</td>
			<td></td>
		</tr>
		<tr>
			<td>Nuclease-free ultra pure water&#160;</td>
			<td>Invitrogen</td>
			<td>9938</td>
			<td></td>
		</tr>
		<tr>
			<td>Pipette tips (nuclease-free)</td>
			<td>Eppendorf</td>
			<td>22491253</td>
			<td></td>
		</tr>
		<tr>
			<td>Pipetter (serological)</td>
			<td>Eppendorf</td>
			<td>2223020-4</td>
			<td></td>
		</tr>
		<tr>
			<td>Pipetters (for volumes under 1ml)</td>
			<td>Eppendorf</td>
			<td>3120000-054</td>
			<td></td>
		</tr>
		<tr>
			<td>Pipettes (serological)</td>
			<td>Fisher</td>
			<td>13-678-27E</td>
			<td></td>
		</tr>
		<tr>
			<td>Controlled rate freezing containers</td>
			<td>Nalgene</td>
			<td>5100-0001</td>
			<td></td>
		</tr>
		<tr>
			<td>Cryoboxes (to hold 2ml and 5ml cryovials and 1.5ml microcentrifuge tubes)</td>
			<td>Fisher</td>
			<td>03-395-464</td>
			<td></td>
		</tr>
		<tr>
			<td>Test tube rack</td>
			<td>Thermo Scientific</td>
			<td>14-804-134</td>
			<td></td>
		</tr>
		<tr>
			<td>15ml polypropylene tubes&#160;</td>
			<td>Fisher</td>
			<td>14-959-49D</td>
			<td></td>
		</tr>
		<tr>
			<td>1.5ml and 0.65 microcentrifuge tubes</td>
			<td>Fisher</td>
			<td>07-200-534 and 07-200-185</td>
			<td></td>
		</tr>
		<tr>
			<td>2ml and 5ml cryovials</td>
			<td>Fisher</td>
			<td>10-500-26 and 10-269-88F&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>8ml CPT vacutainer</td>
			<td>BD Biosciences</td>
			<td>362761</td>
			<td>2 tubes</td>
		</tr>
		<tr>
			<td>6ml K2 EDTA vacutainer</td>
			<td>BD Biosciences</td>
			<td>367863</td>
			<td>2 tubes</td>
		</tr>
		<tr>
			<td>8.5ml SST vacutainer</td>
			<td>BD Biosciences</td>
			<td>367988</td>
			<td>1 tube</td>
		</tr>
		<tr>
			<td>Vortexer</td>
			<td>Fisher</td>
			<td>2215365</td>
			<td></td>
		</tr>
		<tr>
			<td>Dry bath incubator with heating block for microcentrifuge tubes</td>
			<td>Fisher</td>
			<td>11-715-1250</td>
			<td></td>
		</tr>
		<tr>
			<td>Filtration/vacuum system for use within the cell culture hood</td>
			<td>Fisher</td>
			<td>01-257-87</td>
			<td></td>
		</tr>
		<tr>
			<td>Fixed-angle rotor for microcentrifuge tubes with aerosol-tight lid</td>
			<td>Eppendorf</td>
			<td>22637002</td>
			<td></td>
		</tr>
		<tr>
			<td>Refrigerated centrifuge with a swing-bucket rotor and aerosol-tight caps for 16 x 125mm vacutainers and 15ml polypropylene tubes&#160;</td>
			<td>Eppendorf</td>
			<td>22628157</td>
			<td>2, one does not need to be refrigerated</td>
		</tr>
		<tr>
			<td>Nanodrop 2000 (recommended for accuracy of small volumes) or other spectrophotometric device</td>
			<td>Fisher</td>
			<td>13-400-411</td>
			<td></td>
		</tr>
		<tr>
			<td>Agilent Bioanalyzer</td>
			<td>Agilent Technologies</td>
			<td>G2940CA</td>
			<td></td>
		</tr>
		<tr>
			<td>Liquid nitrogen tank</td>
			<td>Thermo Scientific</td>
			<td>11-676-56</td>
			<td></td>
		</tr>
		<tr>
			<td>-80 &#730;C freezer</td>
			<td>Thermo Scientific</td>
			<td>992RAK</td>
			<td></td>
		</tr>
		<tr>
			<td>Sharps container</td>
			<td>Fisher</td>
			<td>22-037-970</td>
			<td></td>
		</tr>
		<tr>
			<td>Biological waste container</td>
			<td>Thermo Scientific</td>
			<td>1223P52</td>
			<td></td>
		</tr>
		<tr>
			<td>Biosafety Level 2&#160; certified cell culture hood</td>
			<td>Thermo Scientific</td>
			<td>13-261-315</td>
			<td></td>
		</tr>
	</tbody>
</table>

rapid fractionation and isolation of whole blood components in samples obtained from a community-based setting

Collecte et traitement des échantillons de sang entier dans un cadre non clinique offre une occasion unique d&#39;évaluer les personnes vivant dans la communauté à la fois avec et sans conditions préexistantes. Le traitement rapide de ces échantillons est essentiel pour éviter la dégradation des composants cellulaires clés. Inclus ici sont des méthodes pour simultanée périphérique cellules mononucléaires du sang (CMSP), l&#39;ADN, l&#39;ARN et l&#39;isolement de sérum provenant d&#39;un simple prélèvement de sang effectué dans les maisons des participants consentants dans une région métropolitaine, avec la transformation engagées dans les 2 heures de la collecte. Nous avons utilisé ces techniques pour traiter plus de 1.600 échantillons de sang rendement, des matériaux de haute qualité constante, qui a ensuite été utilisé dans succès méthylation de l&#39;ADN, le génotypage, l&#39;expression génique et la cytométrie en flux analyses. Certaines des méthodes employées sont la norme; Cependant, lorsqu&#39;ils sont combinés de la manière décrite, ils permettent un traitement efficace des échantillons provenant de participants Population- et / ou communautaireétudes fondées qui ne seraient normalement pas être évaluées dans un cadre clinique. Par conséquent, ce protocole a le potentiel d&#39;obtenir des échantillons (données) et par la suite qui sont plus représentatives de la population générale.

Il est essentiel que la procédure globale de produire un matériau de haute qualité pour analyse dans une multitude d&#39;applications en aval, y compris l&#39;expression génique par l&#39;intermédiaire de puce à ADN et analyse par RT-PCR, la détection de modifications épigénétiques, et les variations de sous-ensembles de la cellule. Le tableau 1 indique le rendement moyen et la qualité des matériaux à partir de chacun des processus. La figure 3 donne un exe...

Watch this Scientific Journal Video about Rapid Fractionation and Isolation of Whole Blood Components in Samples Obtained from a Community-based Setting at JoVE.com

Rapid Fractionation and Isolation of Whole Blood Components in Samples Obtained from a Community-based Setting

We outline a methodology for the processing of whole blood to obtain a variety of components for further analysis. We have optimized a streamlined protocol that enables rapid, high-throughput simultaneous processing of whole blood samples in a non-clinical setting.

Fractionnement rapide et isolement de composants de sang total dans les échantillons obtenus à partir d&#39;un milieu communautaire

Collection and processing of whole blood samples in a non-clinical setting offers a unique opportunity to evaluate community-dwelling individuals both ...

rapid-fractionation-isolation-whole-blood-components-samples-obtained

Research

JoVE Journal

Medicine

15.9K vues.  University of Illinois at Urbana-Champaign. We outline a methodology for the processing of whole blood to obtain a variety of components for further analysis. We have optimized a streamlined protocol that enables rapid, high-throughput simultaneous processing of whole blood samples in a non-clinical setting.

Vidéo: Rapid Fractionation and Isolation of Whole Blood Components in Samples Obtained from a Community-based Setting

Rapid Point-of-Care Assay of Enoxaparin Anticoagulant Efficacy in Whole Blood

There is the need for a clinical assay to determine the extent to which a patient's blood is effectively anticoagulated by the low-molecular-weight-heparin (LMWH), enoxaparin. There are also urgent clinical situations where it would be important if this could be determined rapidly. The present assay is designed to accomplish this. We only assayed human blood samples that were spiked with known concentrations of enoxaparin. The essential feature of the present assay is the quantification of the efficacy of enoxaparin in a patient's blood sample by degrading it to complete inactivity with heparinase. Two blood samples were drawn into Vacutainer tubes (Becton-Dickenson; Franklin Lakes, NJ) that were spiked with enoxaparin; one sample was digested with heparinase for 5 min at 37 &deg;C, the other sample represented the patient's baseline anticoagulated status. The percent shortening of clotting time in the heparinase-treated sample, as compared to the baseline state, yielded the anticoagulant contribution of enoxaparin. We used the portable, battery operated Hemochron 801 apparatus for measurements of clotting times (International Technidyne Corp., Edison, NJ). The apparatus has 2 thermostatically controlled (37 &deg;C) assay tube wells. We conducted the assays in two types of assay cartridges that are available from the manufacturer of the instrument. One cartridge was modified to increase its sensitivity. We removed the kaolin from the FTK-ACT cartridge by extensive rinsing with distilled water, leaving only the glass surface of the tube, and perhaps the detection magnet, as activators. We called this our minimally activated assay (MAA). The use of a minimally activated assay has been studied by us and others. 2-4 The second cartridge that was studied was an activated partial thromboplastin time (aPTT) assay (A104). This was used as supplied from the manufacturer. The thermostated wells of the instrument were used for both the heparinase digestion and coagulation assays. The assay can be completed within 10 min. The MAA assay showed robust changes in clotting time after heparinase digestion of enoxaparin over a typical clinical concentration range. At 0.2 anti-Xa I.U. of enoxaparin per ml of blood sample, heparinase digestion caused an average decrease of 9.8% (20.4 sec) in clotting time; at 1.0 I.U. per ml of enoxaparin there was a 41.4% decrease (148.8 sec). This report only presents the experimental application of the assay; its value in a clinical setting must still be established.

Demonstration of a rapid quantitative assay of the inhibition of blood coagulation by the low-molecular-weight-heparin, enoxaparin. The contribution of enoxaparin is assessed by removing its influence through digestion with heparinase. A fuller description of the assay is detailed in our published paper.1 The assay still requires clinical confirmation.

Rapid Point-of-Care Test de l&#39;efficacité anticoagulante énoxaparine dans le sang total

There is the need for a clinical assay to determine the extent to which a patient's blood is effectively anticoagulated by the ...

Recherche

Médecine

The &alpha;-test: Rapid Cell-free CD4 Enumeration Using Whole Saliva

There is an urgent need for affordable CD4 enumeration to monitor HIV disease. CD4 enumeration is out of reach in resource-limited regions due to the time and temperature restrictions, technical sophistication, and cost of reagents, in particular monoclonal antibodies to measure CD4 on blood cells, the only currently acceptable method. A commonly used cost-saving and time-saving laboratory strategy is to calculate, rather than measure certain blood values. For example, LDL levels are calculated using the measured levels of total cholesterol, HDL, and triglycerides1. Thus, identification of cell-free correlates that directly regulate the number of CD4+ T cells could provide an accurate method for calculating CD4 counts due to the physiological relevance of the correlates.
The number of stem cells that enter blood and are destined to become circulating CD4+ T cells is determined by the chemokine CXCL12 and its receptor CXCR4 due to their influence on locomotion2. The process of stem cell locomotion into blood is additionally regulated by cell surface human leukocyte elastase (HLECS) and the HLECS-reactive active &alpha;1proteinase inhibitor (&alpha;1PI, &alpha;1antitrypsin, SerpinA1)3. In HIV-1 disease, &alpha;1PI is inactivated due to disease processes 4. In the early asymptomatic categories of HIV-1 disease, active &alpha;1PI was found to be below normal in 100% of untreated HIV-1 patients (median=12 &mu;M, and to achieve normal levels during the symptomatic categories4, 5. This pattern has been attributed to immune inactivation, not to insufficient synthesis, proteolytic inactivation, or oxygenation. We observed that in HIV-1 subjects with &gt;220 CD4 cells/&mu;l, CD4 counts were correlated with serum levels of active &alpha;1PI (r2=0.93, p&lt;0.0001, n=26) and inactive &alpha;1PI (r2=0.91, p&lt;0.0001, n=26) 5. Administration of &alpha;1PI to HIV-1 infected and uninfected subjects resulted in dramatic increases in CD4 counts suggesting &alpha;1PI participates in regulating the number of CD4+ T cells in blood 3.
With stimulation, whole saliva contains sufficient serous exudate (plasma containing proteinaceous material that passes through blood vessel walls into saliva) to allow measurement of active &alpha;1PI and the correlation of this measurement is evidence that it is an accurate method for calculating CD4 counts. Briefly, sialogogues such as chewing gum or citric acid stimulate the exudation of serum into whole mouth saliva. After stimulating serum exudation, the activity of serum &alpha;1PI in saliva is measured by its capacity to inhibit elastase activity. Porcine pancreatic elastase (PPE) is a readily available inexpensive source of elastase. PPE binds to &alpha;1PI forming a one-to-one complex that prevents PPE from cleaving its specific substrates, one of which is the colorimetric peptide, succinyl-L-Ala-L-Ala-L-Ala-p-nitroanilide (SA3NA). Incubating saliva with a saturating concentration of PPE for 10 min at room temperature allows the binding of PPE to all the active &alpha;1PI in saliva. The resulting inhibition of PPE by active &alpha;1PI can be measured by adding the PPE substrate SA3NA. (Figure 1). Although CD4 counts are measured in terms of blood volume (CD4 cells/&mu;l), the concentration of &alpha;1PI in saliva is related to the concentration of serum in saliva, not to volume of saliva since volume can vary considerably during the day and person to person6. However, virtually all the protein in saliva is due to serum content, and the protein content of saliva is measurable7. Thus, active &alpha;1PI in saliva is calculated as a ratio to saliva protein content and is termed the &alpha;1PI Index. Results presented herein demonstrate that the &alpha;1PI Index provides an accurate and precise physiologic method for calculating CD4 counts.

The &amp;#945;-test: Rapid Cell-free CD4 Enumeration Using Whole Saliva

A CD4 enumeration method, the &#x03B1;-test, is described which uses whole saliva to provide rapid and accurate CD4 counts. The &alpha;-test costs pennies and eliminates the need for technical training, costly reagents such as monoclonal antibodies, instrumentation, refrigeration, transport of samples, as well as collection and handling of blood.

Le α-test: Rapid portable sans énumération des CD4 utilisant la salive entier

There is an urgent need for affordable CD4 enumeration to monitor HIV disease. CD4 enumeration is out of reach in resource-limited regions due to the time ...

Isolation and Functional Characterization of Human Ventricular Cardiomyocytes from Fresh Surgical Samples

Cardiomyocytes from diseased hearts are subjected to complex remodeling processes involving changes in cell structure, excitation contraction coupling and membrane ion currents. Those changes are likely&#160;to be responsible for the increased arrhythmogenic risk and the contractile alterations leading to systolic and diastolic dysfunction in cardiac patients. However, most information on the alterations of myocyte function in cardiac diseases has come from animal models.
Here we describe and validate a protocol to isolate viable myocytes from small surgical samples of ventricular myocardium from patients undergoing cardiac surgery operations. The protocol is described in detail. Electrophysiological and intracellular calcium measurements are reported to demonstrate the feasibility of a number of single cell measurements in human ventricular cardiomyocytes obtained with this method.
The protocol reported here can be useful for future investigations of the cellular and molecular basis of functional alterations of the human heart in the presence of different cardiac diseases. Further, this method can be used to identify novel therapeutic targets at cellular level and to test the effectiveness of new compounds on human cardiomyocytes, with direct translational value.

Current knowledge on the cellular basis of cardiac diseases mostly relies on studies on animal models. Here we describe and validate a novel method to obtain single viable cardiomyocytes from small surgical samples of human ventricular myocardium. Human ventricular myocytes can be used for electrophysiological studies and drug testing.

L&#39;isolement et la caractérisation fonctionnelle de Human ventriculaire cardiomyocytes à partir des échantillons chirurgicaux frais

Cardiomyocytes from diseased hearts are subjected to complex remodeling processes involving changes in cell structure, excitation contraction coupling and ...

Setting-up an In Vitro Model of Rat Blood-brain Barrier (BBB): A Focus on BBB Impermeability and Receptor-mediated Transport

The blood brain barrier (BBB) specifically regulates molecular and cellular flux between the blood and the nervous tissue. Our aim was to develop and characterize a highly reproducible rat syngeneic in vitro model of the BBB using co-cultures of primary rat brain endothelial cells (RBEC) and astrocytes to study receptors involved in transcytosis across the endothelial cell monolayer. Astrocytes were isolated by mechanical dissection following trypsin digestion and were frozen for later co-culture. RBEC were isolated from 5-week-old rat cortices. The brains were cleaned of meninges and white matter, and mechanically dissociated following enzymatic digestion. Thereafter, the tissue homogenate was centrifuged in bovine serum albumin to separate vessel fragments from nervous tissue. The vessel fragments underwent a second enzymatic digestion to free endothelial cells from their extracellular matrix. The remaining contaminating cells such as pericytes were further eliminated by plating the microvessel fragments in puromycin-containing medium. They were then passaged onto filters for co-culture with astrocytes grown on the bottom of the wells. RBEC expressed high levels of tight junction (TJ) proteins such as occludin, claudin-5 and ZO-1 with a typical localization at the cell borders. The transendothelial electrical resistance (TEER) of brain endothelial monolayers, indicating the tightness of TJs reached 300 ohm&#183;cm2 on average. The endothelial permeability coefficients (Pe) for lucifer yellow (LY) was highly reproducible with an average of 0.26 &#177;&#160;0.11 x 10-3 cm/min. Brain endothelial cells organized in monolayers expressed the efflux transporter P-glycoprotein (P-gp), showed a polarized transport of rhodamine 123, a ligand for P-gp, and showed specific transport of transferrin-Cy3 and DiILDL across the endothelial cell monolayer. In conclusion, we provide a protocol for setting up an in vitro BBB model that is highly reproducible due to the quality assurance methods, and that is suitable for research on BBB transporters and receptors.

Setting-up an In Vitro Model of Rat Blood-brain Barrier BBB: A Focus on BBB Impermeability and Receptor-mediated Transport

The aim of the present study was to validate the reproducibility of an in vitro BBB model involving a rat syngeneic co-culture of endothelial cells and astrocytes. The endothelial cell monolayer presented high TEER and low LY permeability. Expression of specific TJ proteins, functional responses to inflammation and functionality of transporters and receptors were assessed.

Mise en place d&#39;un<em&gt; In Vitro</em&gt; Modèle de Rat barrière hémato-encéphalique (BHE): un regard sur le Bureau imperméabilité et de transport médié par le récepteur

The blood brain barrier (BBB) specifically regulates molecular and cellular flux between the blood and the nervous tissue. Our aim was to develop and ...

Isolation of Cancer Stem Cells From Human Prostate Cancer Samples

The cancer stem cell (CSC) model has been considerably revisited over the last two decades. During this time CSCs have been identified and directly isolated from human tissues and serially propagated in immunodeficient mice, typically through antibody labeling of subpopulations of cells and fractionation by flow cytometry. However, the unique clinical features of prostate cancer have considerably limited the study of prostate CSCs from fresh human tumor samples. We recently reported the isolation of prostate CSCs directly from human tissues by virtue of their HLA class I (HLAI)-negative phenotype. Prostate cancer cells are harvested from surgical specimens and mechanically dissociated. A cell suspension is generated and labeled with fluorescently conjugated HLAI and stromal antibodies. Subpopulations of HLAI-negative cells are finally isolated using a flow cytometer. The principal limitation of this protocol is the frequently microscopic and multifocal nature of primary cancer in prostatectomy specimens. Nonetheless, isolated live prostate CSCs are suitable for molecular characterization and functional validation by transplantation in immunodeficient mice.

The isolation of cancer stem cells (CSCs) directly from human tissues is requisite for their biological characterization. This manuscript describes a methodology for the isolation of prostate CSCs from human tissues, while also providing tips on troubleshooting difficult steps.

Isolement de cellules souches du cancer à partir d&#39;échantillons cancer de la prostate humaine

The cancer stem cell (CSC) model has been considerably revisited over the last two decades. During this time CSCs have been identified and directly ...

Collection, Isolation, and Flow Cytometric Analysis of Human Endocervical Samples

Despite the public health importance of mucosal pathogens (including HIV), relatively little is known about mucosal immunity, particularly at the female genital tract (FGT). Because heterosexual transmission now represents the dominant mechanism of HIV transmission, and given the continual spread of sexually transmitted infections (STIs), it is critical to understand the interplay between host and pathogen at the genital mucosa. The substantial gaps in knowledge around FGT immunity are partially due to the difficulty in successfully collecting and processing mucosal samples. In order to facilitate studies with sufficient sample size, collection techniques must be minimally invasive and efficient. To this end, a protocol for the collection of cervical cytobrush samples and subsequent isolation of cervical mononuclear cells (CMC) has been optimized. Using ex vivo flow cytometry-based immunophenotyping, it is possible to accurately and reliably quantify CMC lymphocyte/monocyte population frequencies and phenotypes. This technique can be coupled with the collection of cervical-vaginal lavage (CVL), which contains soluble immune mediators including cytokines, chemokines and anti-proteases, all of which can be used to determine the anti- or pro-inflammatory environment in the vagina.

The use of cytobrush sampling to collect lymphocytes and monocytes from the endocervix is a minimally invasive technique that provides samples for analysis of female genital tract immunity. In this protocol, we describe the collection of cytobrush samples and immune cell isolation for flow cytometry assays.

Collection, isolement, et cytométrie en flux analyse des échantillons Endocervical humain

Despite the public health importance of mucosal pathogens (including HIV), relatively little is known about mucosal immunity, particularly at the female ...

Real-time Cytotoxicity Assays in Human Whole Blood

A live cell-based whole blood cytotoxicity assay (WCA) that allows access to temporal information of the overall cell cytotoxicity is developed with high-throughput cell positioning technology. The targeted tumor cell populations are first preprogrammed to immobilization into an array format, and labeled with green fluorescent cytosolic dyes. Following the cell array formation, antibody drugs are added in combination with human whole blood. Propidium iodide (PI) is then added to assess cell death. The cell array is analyzed with an automatic imaging system. While cytosolic dye labels the targeted tumor cell populations, PI labels the dead tumor cell populations. Thus, the percentage of target cancer cell killing can be quantified by calculating the number of surviving targeted cells to the number of dead targeted cells. With this method, researchers are able to access time-dependent and dose-dependent cell cytotoxicity information. Remarkably, no hazardous radiochemicals are used. The WCA presented here has been tested with lymphoma, leukemia, and solid tumor cell lines. Therefore, WCA allows researchers to assess drug efficacy in a highly relevant ex&#160;vivo condition.

The whole blood cytotoxicity assay (WCA) is a cytotoxicity assay developed by incorporating high-throughput cell positioning technology with fluorescence microscopy and automated image processing. Here, we describe how lymphoma cells treated with an anti-CD20 antibody can be analyzed real-time in human whole blood to provide quantitative cellular cytotoxicity analysis.

En temps réel cytotoxicité dans le sang total humain

A live cell-based whole blood cytotoxicity assay (WCA) that allows access to temporal information of the overall cell cytotoxicity is developed with ...

Preparation and Respirometric Assessment of Mitochondria Isolated from Skeletal Muscle Tissue Obtained by Percutaneous Needle Biopsy

Respirometric profiling of isolated mitochondria is commonly used to investigate electron transport chain function. We describe a method for obtaining samples of human Vastus lateralis, isolating mitochondria from minimal amounts of skeletal muscle tissue, and plate based respirometric profiling using an extracellular flux (XF) analyzer. Comparison of respirometric profiles obtained using 1.0, 2.5 and 5.0 &#956;g of mitochondria indicate that 1.0 &#956;g is sufficient to measure respiration and that 5.0 &#956;g provides most consistent results based on comparison of standard errors. Western blot analysis of isolated mitochondria for mitochondrial marker COX IV and non-mitochondrial tissue marker GAPDH indicate that there is limited non-mitochondrial contamination using this protocol. The ability to study mitochondrial respirometry in as little as 20 mg of muscle tissue allows users to utilize individual biopsies for multiple study endpoints in clinical research projects.

Methods for biopsy of Vastus lateralis, preparation of purified mitochondria, and respirometric profiling are described. The use of small muscle volume makes this technique suitable for clinical research applications.

Préparation et respirométrique évaluation des mitochondries isolées de tissu musculaire squelettique Obtenu par biopsie percutanée aiguille

Respirometric profiling of isolated mitochondria is commonly used to investigate electron transport chain function. We describe a method for obtaining ...

Establishment of Human Epithelial Enteroids and Colonoids from Whole Tissue and Biopsy

The epithelium of the gastrointestinal tract is constantly renewed as it turns over. This process is triggered by the proliferation of intestinal stem cells (ISCs) and progeny that progressively migrate and differentiate toward the tip of the villi. These processes, essential for gastrointestinal homeostasis, have been extensively studied using multiple approaches. Ex vivo technologies, especially primary cell cultures have proven to be promising for understanding intestinal epithelial functions. A long-term primary culture system for mouse intestinal crypts has been established to generate 3-dimensional epithelial organoids. These epithelial structures contain crypt- and villus-like domains reminiscent of normal gut epithelium. Commonly, termed &#8220;enteroids&#8221; when derived from small intestine and &#8220;colonoids&#8221; when derived from colon, they are different from organoids that also contain mesenchyme tissue. Additionally, these enteroids/colonoids continuously produce all cell types found normally within the intestinal epithelium. This in vitro organ-like culture system is rapidly becoming the new gold standard for investigation of intestinal stem cell biology and epithelial cell physiology. This technology has been recently transferred to the study of human gut. The establishment of human derived epithelial enteroids and colonoids from small intestine and colon has been possible through the utilization of specific culture media that allow their growth and maintenance over time. Here, we describe a method to establish a small intestinal and colon crypt-derived system from human whole tissue or biopsies. We emphasize the culture modalities that are essential for the successful growth and maintenance of human enteroids and colonoids.

We describe a method to establish human enteroids from small intestinal crypts and colonoids from colon crypts collected from both surgical tissue and biopsies. In this methodological article, we present the culture modalities that are essential for the successful growth and maintenance of human enteroids and colonoids.

Mise en place d&#39;épithéliales humaines Enteroids et Colonoids de tout le tissu et la biopsie

The epithelium of the gastrointestinal tract is constantly renewed as it turns over. This process is triggered by the proliferation of intestinal stem ...

Isolation of Atrial Myocytes from Adult Mice

The electrophysiological properties of atrial myocytes importantly affect overall cardiac function. Alterations in the underlying ionic currents responsible for the action potential can cause pro-arrhythmic substrates that underlie arrhythmias, such as atrial fibrillation, which are highly prevalent in many conditions and disease states. Isolating adult mouse atrial cardiomyocytes for use in patch-clamp experiments has greatly advanced our knowledge and understanding of the cellular electrophysiology in the healthy atrial myocardium and in the setting of atrial pathophysiology. In addition, studies using genetic mouse models have elucidated the role of a vast array of proteins in regulating atrial electrophysiology. Here we provide a detailed protocol for the isolation of cardiomyocytes from the atrial appendages of adult mice using a combination of enzymatic digestion and mechanical dissociation of these tissues. This approach consistently and reliably yields isolated atrial cardiomyocytes that can then be used to characterize cellular electrophysiology by measuring action potentials and ionic currents in patch-clamp experiments under a number of experimental conditions.

This protocol is used to isolate single atrial cardiomyocytes from the adult mouse heart using a chunk digestion approach. This approach is used to isolate right or left atrial myocytes that can be used to characterize atrial myocyte electrophysiology in patch-clamp studies.