Name: discrimination of seven immune cell subsets by two-fluorochrome flow cytometry
Uploaded: 2019-03-05T13:00:00
Description: Watch this Scientific Journal Video about Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry at JoVE.com

This study was supported by the National Institute of Arthritis and Musculoskeletal and Skin Diseases, &#60;https://www.niams.nih.gov/&#62;, award number P30-AR053503; The Stabler Foundation,&#160;www.stablerfoundation.org; National Institute of Allergy and Infectious Disease, www.niaid.nih.gov, T32AI007247; Nina Ireland Program for Lung Health (NIPLH), https://pulmonary.ucsf.edu/ireland/.

All studies of human materials were approved by the Johns Hopkins Institutional Review Board under the Health Insurance Portability and Accountability Act. Patient and control samples were de-identified. PBMCs and blood from healthy controls were obtained by informed consent.
NOTE: This protocol has been tested on freshly or frozen isolated peripheral blood cells and whole blood.
1. Cell Preparation
<ol>
	<li>Isolation of peripheral blood ...

<ol>
	<li>Bendall, S. C., Nolan, G. P., Roederer, M., Chattopadhyay, P. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+deep+profiler's+guide+to+cytometry.">A deep profiler's guide to cytometry.</a> Trends in Immunology. 33 (7), 323-332 (2012).</li><li>Boin, F., 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=Flow+cytometric+discrimination+of+seven+lineage+markers+by+using+two+fluorochromes.">Flow cytometric discrimination of seven lineage markers by using two fluorochromes.</a> PLoS ONE. 12 (11), (2017).</li><li>Zola, 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=.">.</a> Leukocyte and Stromal Cell Molecules: The CD Markers. , (2007).</li><li>Lambert, C., Genin, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CD3+bright+lymphocyte+population+reveal+&#947;&#948;+T+cells.">CD3 bright lymphocyte population reveal &#947;&#948; T cells.</a> Cytometry Part B: Clinical Cytometry. 61 (1), 45-53 (2004).</li><li>Ginaldi, 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=Differential+expression+of+T+cell+antigens+in+normal+peripheral+blood+lymphocytes:+a+quantitative+analysis+by+flow+cytometry.">Differential expression of T cell antigens in normal peripheral blood lymphocytes: a quantitative analysis by flow cytometry.</a> Journal of Clinical Pathology. 49 (7), 539-544 (1996).</li><li>Park, J., Han, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Single-color+Multitarget+Flow+Cytometry+Using+Monoclonal+Antibodies+Labeled+with+Different+Intensities+of+the+Same+Fluorochrome.">Single-color Multitarget Flow Cytometry Using Monoclonal Antibodies Labeled with Different Intensities of the Same Fluorochrome.</a> Annals of Laboratory Medicine. 32 (3), 171-176 (2012).</li><li>Mansour, I., 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=Triple+labeling+with+two-color+immunoflorescence+using+one+light+source:+A+useful+approach+for+the+analysis+of+cells+positive+for+one+label+and+negative+for+the+other+two.">Triple labeling with two-color immunoflorescence using one light source: A useful approach for the analysis of cells positive for one label and negative for the other two.</a> Cytometry. 11 (5), 636-641 (1990).</li><li>Bocsi, J., Melzer, S., D&#228;hnert, I., T&#225;rnok, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=OMIP-023:+10-Color,+13+antibody+panel+for+in-depth+phenotyping+of+human+peripheral+blood+leukocytes.">OMIP-023: 10-Color, 13 antibody panel for in-depth phenotyping of human peripheral blood leukocytes.</a> Cytometry Part A. 85 (9), 781-784 (2014).</li><li>Van Dongen, J. J. 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=EuroFlow+antibody+panels+for+standardized+n-dimensional+flow+cytometric+immunophenotyping+of+normal,+reactive+and+malignant+leukocytes.">EuroFlow antibody panels for standardized n-dimensional flow cytometric immunophenotyping of normal, reactive and malignant leukocytes.</a> Leukemia. 26 (9), 1908-1975 (2012).</li><li>Bradford, J. A., Buller, G., Suter, M., Ignatius, M., Beechem, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fluorescence-intensity+multiplexing:+Simultaneous+seven-marker,+two-color+immunophenotyping+using+flow+cytometry.">Fluorescence-intensity multiplexing: Simultaneous seven-marker, two-color immunophenotyping using flow cytometry.</a> Cytometry Part A. 61 (2), 142-152 (2004).</li><li>R&#252;hle, P. F., Fietkau, R., Gaipl, U. S., Frey, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+a+Modular+Assay+for+Detailed+Immunophenotyping+of+Peripheral+Human+Whole+Blood+Samples+by+Multicolor+Flow+Cytometry.">Development of a Modular Assay for Detailed Immunophenotyping of Peripheral Human Whole Blood Samples by Multicolor Flow Cytometry.</a> International Journal of Molecular Sciences. 17 (8), (2016).</li><li>H&#248;nge, B. L., Petersen, M. S., Olesen, R., M&#248;ller, B. K., Erikstrup, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optimizing+recovery+of+frozen+human+peripheral+blood+mononuclear+cells+for+flow+cytometry.">Optimizing recovery of frozen human peripheral blood mononuclear cells for flow cytometry.</a> PLOS ONE. 12 (11), e0187440 (2017).</li><li>Roederer, M. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=FACS+analysis+of+lymphocytes.">FACS analysis of lymphocytes.</a> Handbook of Experimental Immunology. 49, (1997).</li><li>Srivastava, P., Sladek, T. L., Goodman, M. N., Jacobberger, J. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Streptavidin-based+quantitative+staining+of+intracellular+antigens+for+flow+cytometric+analysis.">Streptavidin-based quantitative staining of intracellular antigens for flow cytometric analysis.</a> Cytometry. 13 (7), 711-721 (1992).</li><li>Maecker, H. 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=Selecting+fluorochrome+conjugates+for+maximum+sensitivity.">Selecting fluorochrome conjugates for maximum sensitivity.</a> Cytometry Part A. , (2004).</li><li>Noonan, K. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adoptive+transfer+of+activated+marrow-infiltrating+lymphocytes+induces+measurable+antitumor+immunity+in+the+bone+marrow+in+multiple+myeloma.">Adoptive transfer of activated marrow-infiltrating lymphocytes induces measurable antitumor immunity in the bone marrow in multiple myeloma.</a> Science Translational Medicine. 7 (288), (2015).</li><li>Mahnke, Y. D., Beddall, M. H., Roederer, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=OMIP-017:+Human+CD4++helper+T-cell+subsets+including+follicular+helper+cells.">OMIP-017: Human CD4+ helper T-cell subsets including follicular helper cells.</a> Cytometry Part A. 83 (5), 439-440 (2013).</li><li>Bonecchi, 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=Differential+Expression+of+Chemokine+Receptors+and+Chemotactic+Responsiveness+of+Type+1+T+Helper+Cells+(Th1s)+and+Th2s.">Differential Expression of Chemokine Receptors and Chemotactic Responsiveness of Type 1 T Helper Cells (Th1s) and Th2s.</a> The Journal of Experimental Medicine. 187 (1), 129-134 (1998).</li><li>Acosta-Rodriguez, E. V., 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=Surface+phenotype+and+antigenic+specificity+of+human+interleukin+17-producing+T+helper+memory+cells.">Surface phenotype and antigenic specificity of human interleukin 17-producing T helper memory cells.</a> Nature Immunology. 8 (6), 639-646 (2007).</li><li>Rivino, 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=Chemokine+Receptor+Expression+Identifies+Pre-T+Helper+(Th)1,+Pre-Th2,+and+Nonpolarized+Cells+among+Human+CD4++Central+Memory+T+Cells.">Chemokine Receptor Expression Identifies Pre-T Helper (Th)1, Pre-Th2, and Nonpolarized Cells among Human CD4+ Central Memory T Cells.</a> The Journal of Experimental Medicine. 200 (6), 725-735 (2004).</li><li>Ye, Z. -. 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=Differentiation+and+recruitment+of+Th9+cells+stimulated+by+pleural+mesothelial+cells+in+human+Mycobacterium+tuberculosis+infection.">Differentiation and recruitment of Th9 cells stimulated by pleural mesothelial cells in human Mycobacterium tuberculosis infection.</a> PloS One. 7 (2), e31710 (2012).</li><li>Speiser, D. E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+CD8++T+cells+expressing+HLA-DR+and+CD28+show+telomerase+activity+and+are+distinct+from+cytolytic+effector+T+cells.">Human CD8+ T cells expressing HLA-DR and CD28 show telomerase activity and are distinct from cytolytic effector T cells.</a> European Journal of Immunology. 31 (2), 459-466 (2001).</li><li>Caruso, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Flow+cytometric+analysis+of+activation+markers+on+stimulated+T+cells+and+their+correlation+with+cell+proliferation.">Flow cytometric analysis of activation markers on stimulated T cells and their correlation with cell proliferation.</a> Cytometry. 27 (1), 71-76 (1997).</li><li>Brenchley, J. 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The protocol presented here has been shown to be quite flexible and insensitive to changes in staining buffer, temperature and peripheral blood cell preparation due to the high expression of lineage markers on the cell surface. The most critical step for obtaining high-quality, reproducible data is antibody titration. Of note, since the titration of antibodies should always be performed during the setup of a flow cytometric panel, this step does not add extra bench-time to our two-fluorochrome approach. Titration of anti...

Flow cytometry is a technique that was developed to analyze multiple parameters on single particles at a rate of several thousand of events per second1. Examples of specimens analyzed by flow cytometry include, but are not limited to, cells, beads, bacteria, vesicles and chromosomes. A fluidic system directs particles at the interrogation point where each particle intersects its path with one or more lasers, and multiple parameters are recorded for further analysis. Forward and side scatters, generated by scattering of the pure laser light, are used to identify the target population and retrieve information about the relative size and internal complexity/granularity of particles, respectively. All the other parameters, that account for most of data in a flow cytometric analysis, are derived by fluorochrome-labeled probes that recognize and bind to specific targets on the particles of interest.
Flow cytometry is a primary tool for immunological studies to identify and characterize cell populations. To dissect the complexity of the immune system, multicolor panels are constantly evolving to expand the number of markers simultaneously recorded for deep immunophenotyping of cell populations1. This is leading to the development of more capable instruments and fluorochromes, with recent high-end flow cytometers exceeding 20 fluorescent parameters. This results in complex study design due to fluorochrome spectral overlap and in higher costs associated with custom antibody labelling and skilled operators. In several instances, complexity and costs are reduced by using separate panels of markers for different cell populations. This approach, however, is error prone, reduces the information in each panel, and can be difficult to apply to samples with limited number of cells. Moreover, increasing the number of markers precludes deep immunophenotyping on instruments with fewer fluorescent parameters. We previously developed a staining protocol to identify major human immune populations (CD4+ and CD8+ T cells, &#947;&#948; T cells, B cells, NK cells and monocytes) in peripheral blood mononuclear cells (PBMCs) by combining seven lineage markers using only two fluorochromes instead of the seven required using the traditional &#34;one fluorochrome-one marker&#34; approach (www.hcdm.org)2,3.&#160;Our initial report explored and validated the notion of combining seven markers in two fluorochromes for deep immunophenotyping. In this report, we present a step-by step protocol to isolate and stain peripheral blood cells, focusing on the practical aspect and troubleshooting steps to achieve a successful staining.&#160;
This protocol is based on the observation that lineage markers have a constant expression on the cell surface and that each cell population has an exclusive combination of lineage markers. In PBMCs, CD3 expression subdivides immune cells into two main categories: CD3-positive T lymphocytes and CD3-negative cells. Within the CD3 positive subgroup, CD4+, CD8+ and &#947;&#948; T cells can be separated using antibodies that solely target CD4, CD8 and the &#947;&#948; receptor. In a comparable way, within the CD3 negative subgroup, B cells, NK cells and monocytes can be uniquely identified using antibodies against CD19, CD56 and CD14, respectively. In a standard one fluorochrome-one marker approach, anti-CD3, -CD4, -CD8, -CD14, -CD19, -CD56 and -TCR &#947;&#948; antibodies are detected with seven different fluorochromes. Our approach combines anti-CD3, -CD56, and -TCR &#947;&#948; antibodies in one fluorochrome (labeled for convenience fluorochrome A) and anti-CD4, -CD8, -CD14 and -CD19 antibodies in a different fluorochrome (fluorochrome B). This is possible by a combination of antibody titration and differential antigen expression. Both CD4+ and CD8+ T cells are positive for the anti-CD3 antibody in fluorochrome A, but they can be separated in fluorochrome B maximizing the expression of the CD8 signal while placing, with an ad hoc titration, the CD4 signal in between the CD8 and the CD3 positive-CD4/CD8 double negative cells. &#947;&#948; T cells expresses higher level of CD3 than CD4 and CD8, and therefore they can be identified as CD3 high4. This signal is further boosted by labeling &#947;&#948; T cells in fluorochrome A with an anti-TCR &#947;&#948; antibodies, thus improving separation between CD3 low T cells and CD3 high &#947;&#948; T cells. B cells can be identified as CD3- in fluorochrome A and CD19+ in fluorochrome B. To separate CD3 negative NK cells from B cells, an anti-CD56 antibody was used in fluorochrome A as the anti-CD3. This is possible because CD56 expressed on NK cell at a much lower level than CD3 on T cells5. Finally, monocytes can be identified via a combination of forward-side scatter properties and expression of CD14 in fluorochrome B.
The idea of combining up to four markers using two fluorochromes has been already successfully attempted before6,7,8, and has been used in a clinical protocol to identify malignant lymphocytic populations9. A previous report also combined seven markers (with different specificity from the markers than we used in our protocol) using two fluorochromes, but this approach relied on a complex labelling of each antibody with varying amount of fluorochrome10. This is in contrast to our method which uses commercially available antibodies and can be adapted to the instrument configuration and can take advantage of the new generation of polymer fluorochromes.
The overall goal of this methodology is to expand the optical limits of most flow cytometers allowing for the recording of five additional markers to interrogate complex cell populations. As a consequence, advanced immunological analysis can be performed on affordable 6-10 fluorochrome flow cytometers, and 2-3 fluorochrome field instruments can achieve remarkable results in areas with limited resources. High-end instruments can also benefit from this approach by using extra fluorochromes to accomplish deeper flow cytometry analysis and to create modular flow cytometric panels targeting several lineages at the same time11. This can potentially reduce the number of panels used in modular immunophenotyping flow cytometry and reduce costs, errors and handling time. This approach is also very well suited in the case of clinical samples with limited number of cells.

<table>
	<tbody>
		<tr>
			<td>CD3</td>
			<td>BD Biosciences</td>
			<td>562426</td>
			<td>Antibody for staining 
			RRID: AB_11152082</td>
		</tr>
		<tr>
			<td>CD56</td>
			<td>BD Biosciences</td>
			<td>562751</td>
			<td>Antibody for staining 
			RRID: AB_2732054</td>
		</tr>
		<tr>
			<td>TCRgd</td>
			<td>BD Biosciences</td>
			<td>331217</td>
			<td>Antibody for staining 
			RRID: AB_2562316</td>
		</tr>
		<tr>
			<td>CD4</td>
			<td>BD Biosciences</td>
			<td>555347</td>
			<td>Antibody for staining 
			RRID: AB_395752</td>
		</tr>
		<tr>
			<td>CD8</td>
			<td>BD Biosciences</td>
			<td>555367</td>
			<td>Antibody for staining 
			RRID: AB_395770</td>
		</tr>
		<tr>
			<td>CD14</td>
			<td>BD Biosciences</td>
			<td>555398</td>
			<td>Antibody for staining 
			RRID: AB_395799</td>
		</tr>
		<tr>
			<td>CD19</td>
			<td>BD Biosciences</td>
			<td>555413</td>
			<td>Antibody for staining 
			RRID: AB_395813</td>
		</tr>
		<tr>
			<td>CD3</td>
			<td>BD Biosciences</td>
			<td>555335</td>
			<td>Antibody for staining 
			RRID: AB_398591</td>
		</tr>
		<tr>
			<td>CD56</td>
			<td>BD Biosciences</td>
			<td>555518</td>
			<td>Antibody for staining 
			RRID: AB_398601</td>
		</tr>
		<tr>
			<td>TCRgd</td>
			<td>BD Biosciences</td>
			<td>331211</td>
			<td>Antibody for staining 
			RRID: AB_1089215</td>
		</tr>
		<tr>
			<td>CCR7</td>
			<td>Biolegend</td>
			<td>353217</td>
			<td>Antibody for staining 
			RRID: AB_10913812</td>
		</tr>
		<tr>
			<td>CD45RA</td>
			<td>BD Biosciences</td>
			<td>560674</td>
			<td>Antibody for staining 
			RRID: AB_1727497</td>
		</tr>
		<tr>
			<td>CCR4</td>
			<td>BD Biosciences</td>
			<td>561034</td>
			<td>Antibody for staining 
			RRID: AB_10563066</td>
		</tr>
		<tr>
			<td>CCR6</td>
			<td>BD Biosciences</td>
			<td>353419</td>
			<td>Antibody for staining 
			RRID: AB_11124539</td>
		</tr>
		<tr>
			<td>CXCR3</td>
			<td>BD Biosciences</td>
			<td>561730</td>
			<td>Antibody for staining 
			RRID: AB_10894207</td>
		</tr>
		<tr>
			<td>CD57</td>
			<td>BD Biosciences</td>
			<td>562488</td>
			<td>Antibody for staining 
			RRID: AB_2737625</td>
		</tr>
		<tr>
			<td>HLA-DR</td>
			<td>BD Biosciences</td>
			<td>563083</td>
			<td>Antibody for staining 
			RRID: AB_2737994</td>
		</tr>
		<tr>
			<td>CD16</td>
			<td>BD Biosciences</td>
			<td>563784</td>
			<td>Antibody for staining 
			RRID: AB_2744293</td>
		</tr>
		<tr>
			<td>Dead cells</td>
			<td>Life technologies</td>
			<td>L-23105</td>
			<td>Live/dead discrimination</td>
		</tr>
		<tr>
			<td>Falcon 5 ml round-bottom polystyrene test tube with cell strainer snap cap</td>
			<td>BD Bioscience</td>
			<td>352235</td>
			<td>to filter cell suspension before passing though the flow cytometer</td>
		</tr>
		<tr>
			<td>Falcon 5 ml round-bottom polystyrene test tube</td>
			<td>BD Bioscience</td>
			<td>352001</td>
			<td>to stain whole blood</td>
		</tr>
		<tr>
			<td>Recovery Cell Culture Freezing Medium</td>
			<td>Thermo fisher</td>
			<td>12648010</td>
			<td>Freezing cells</td>
		</tr>
		<tr>
			<td>96-well V-bottom plate</td>
			<td>Thermo fisher</td>
			<td>249570</td>
			<td>plate for staining</td>
		</tr>
		<tr>
			<td>FACSAria IIu Cell Sorter</td>
			<td>BD Biosciences</td>
			<td></td>
			<td>Flow cytometer</td>
		</tr>
		<tr>
			<td>FCS Express 6</td>
			<td>De Novo Software</td>
			<td></td>
			<td>FACS analysis</td>
		</tr>
		<tr>
			<td>Graphpad Prism</td>
			<td>GraphPad software</td>
			<td></td>
			<td>Data analysis</td>
		</tr>
	</tbody>
</table>

discrimination of seven immune cell subsets by two-fluorochrome flow cytometry

Immune cell characterization heavily relies on multicolor flow cytometry to identify subpopulations based on differential expression of surface markers. Setup of a classic multicolor panel requires high-end instruments, custom labeled antibodies, and careful study design to minimize spectral overlap. We developed a multiparametric analysis to identify major human immune populations (CD4+ and CD8+ T cells, &#947;&#948; T cells, B cells, NK cells and monocytes) in peripheral blood by combining seven lineage markers using only two fluorochromes. Our strategy is based on the observation that lineage markers are constantly expressed in a unique combination by each cell population. Combining this information with a careful titration of the antibodies allows investigators to record five additional markers, expanding the optical limit of most flow cytometers. Head-to-head comparison demonstrated that the vast majority of immune cell populations in peripheral blood can be characterized with comparable accuracy between our method and the classic &#34;one fluorochrome-one marker approach&#34;, although the latter is still more precise for identifying populations such as NKT cells and &#947;&#948; T cells. Combining seven markers using two fluorochromes allows for the analysis of complex immune cell populations and clinical samples on affordable 6-10 fluorochrome flow cytometers, and even on 2-3 fluorochrome field instruments in areas with limited resources. High-end instruments can also benefit from this approach by using extra fluorochromes to accomplish deeper flow cytometry analysis. This approach is also very well suited for screening several cell populations in the case of clinical samples with limited number of cells.

Setup and analysis of a flow cytometry experiment of human peripheral blood cells stained with seven lineage markers (anti-CD3, -CD4, -CD8, -CD14, -CD19, -CD56 and -TCR &#947;&#948; antibodies) using only two fluorochromes are presented.
Representative results are described for anti-CD8 and -CD56 antibody titration. For each antibody (in this example, anti-CD8), data from ten successive 2-fold dilutions were recorded to calculat...

Watch this Scientific Journal Video about Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry at JoVE.com

Discrimination of Seven Immune Cell Subsets by Two-fluorochrome Flow Cytometry

Here, we present a flow cytometric protocol to identify CD4+ and CD8+ T cells, &#947;&#948; T cells, B cells, NK cells and monocytes in human peripheral blood by using only two fluorochromes instead of seven. With this approach, five additional markers can be recorded on most flow cytometers.

Immune cell characterization heavily relies on multicolor flow cytometry to identify subpopulations based on differential expression of surface markers. ...

Research

JoVE Journal

Immunology and Infection

Multicolor Flow Cytometry Analyses of Cellular Immune Response in Rhesus Macaques

The rhesus macaque model is currently the best available model for HIV-AIDS with respect to understanding the pathogenesis as well as for the development ...

Measuring Calpain Activity in Fixed and Living Cells by Flow Cytometry

Calpains are ubiquitous intracellular, calcium-sensitive, neutral cysteine proteases 1. Calpains play crucial roles in many physiological processes, ...

Quantitative Assessment of Immune Cells in the Injured Spinal Cord Tissue by Flow Cytometry:  a Novel Use for a Cell Purification Method

Detection of immune cells in the injured central nervous system (CNS) using morphological or histological techniques has not always provided true ...

Seven Steps to Stellate Cells

Hepatic stellate cells are liver-resident  cells of star-like morphology and are located in the space of Disse between  liver sinusoidal endothelial cells ...

Flow Cytometry Analysis of Immune Cells Within Murine Aortas

Atherosclerosis is a chronic inflammatory process of medium and large size vessels that is characterized by the formation of plaques consisting of foam ...

Human In Vitro Suppression as Screening Tool for the Recognition of an Early State of Immune Imbalance

Human In Vitro Suppression as Screening Tool for the Recognition of an Early State of Immune Imbalance

Regulatory T cells (Tregs) are critical mediators of immune tolerance to self-antigens. In addition, they are crucial regulators of the immune response ...

Examination of Thymic Positive and Negative Selection by Flow Cytometry

A healthy immune system requires that T cells respond to foreign  antigens while remaining tolerant to self-antigens. Random rearrangement of the  T cell ...

Detection of Fluorescent Nanoparticle Interactions with Primary Immune Cell Subpopulations by Flow Cytometry

Engineered nanoparticles are endowed with very promising properties for therapeutic and diagnostic purposes. This work describes a fast and reliable ...

Fluorescence-activated Cell Sorting for Purification of Plasmacytoid Dendritic Cells from the Mouse Bone Marrow

Fluorescence-activated cell sorting (FACS) is a technique to purify specific cell populations based on phenotypes detected by flow cytometry. This method ...

Measurement of T Cell Alloreactivity Using Imaging Flow Cytometry

The measurement of immunological reactivity to donor antigens in transplant recipients is likely to be crucial for the successful reduction or withdrawal ...