1 Introduction to Flow Cytometry presented by: Flow Cytometry y Core Facility Biomedical Instrumentation Center Uniformed Services University
2 Topics Covered in this Lecture What is flow cytometry? Flow cytometer instrumentation. The use of fluorochromes in flow cytometry. Immunophenotyping. Compensation. Data analysis and gating. Clinical applications. Research applications.
3 Flow Cytometry-- y a.k.a. FACS Flow cytometry is a technique used to measure the physical and chemical properties of cells or cellular components. Cells are measured individually, but in large numbers. Synonymous with FACS (fluorescence-activated cell sorter). Also, simply referred to as Flow.
4 Seeing Cells Microscopists visualize cells based on their morphology and staining characteristics. Flow cytometrists measure cells based on similar characteristics. Hence, using flow cytometry, a cell can be seen both qualitatively and quantitatively.
5 Historically In the clinical lab, mixed cell populations of the blood were evaluated manually by microscope. In the 1950 s, the Coulter counter automated cell counting based on size. Neutrophil Lymphocyte Monocyte Eosinophil Basophil By the 1970 s, a method was needed to automatically separate living cells into subpopulations p for further study.
6 Historically In 1960, Dr. Louis Kamentsky, in collaboration at o with IBM, developed an automated optical scanner that scanned cell preparations on slides. Inferior optical and computer techniques at that time led him to develop a fixed scanner that detected cells, passing in single file, based on their light scatter and absorption. In 1974, Dr. Leonard Herzenberg of Stanford patented a device that sorted living cells into collection vessels for further use in biological analyses the first FACS.
7 Neutrophil Eosinophil Then Lymphocyte Basophil Monocyte ac uk and dnow. Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson
8 Flow Cytometer Instrumentation There are four general components of a flow cytometer: Fluidics Optics Detectors Electronics Understanding how a flow cytometer operates is critical to the design and execution of flow cytometry experiments.
9 Flow Cytometer Fluidics The cell sample is injected into a stream of sheath fluid. By the laminar flow principle, the sample remains in the center of the sheath fluid. The cells in the sample are accelerated and individually pass through a laser beam for interrogation. ti
10 Light Scatter When a cell passes through the laser beam, it deflects incident light. Forward-scattered light (FSC) is proportional to the surface area or size of a cell. Side-scattered light (SSC) is proportional to the granularity or internal complexity of a cell. Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson
11 Flow Cytometer Optics Light emitted from the interaction between the cell particle and the laser beam is collected by a lens. The light moves through h a system of optical mirrors and filters. Specified wavelengths are then routed to optical detectors.
12 Fluorescence In modern flow cytometers, more than one laser is focused on the sample stream. In this way, not only can cells be measured based on their size and internal complexity, but they can also be measured based on their fluorescent signal intensity. Fluorescence is typically bestowed upon a cell through h the use of fluorescent dyes called fluorochromes.
13 Physics of Light Photons of light excite electrons to a higher energy state, which then release energy as heat and light. Each type of fluorochrome exhibits its own Stokes shift in this regard and emits light of a specific wavelength. Guide to Flow Cytometry; DakoCytomation
14 Fluorochrome Emission The laser beam excites the fluorochrome at a specific wavelength (absorption) and the fluorochrome emits light at a separate wavelength (emission). Note that absorption color differs from emission color. Guide to Flow Cytometry; DakoCytomation
15 Flow Cytometer Optics The emission wavelength of a fluorochrome can be optically separated from other confounding light through the use of optical filters. Shortpass, longpass, and bandpass optical filters are used to limit each fluorochrome emission to a desired wavelength.
16 Flow Cytometer Optics Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson
17 Flow Cytometer Signal Detection As a particle passes through the laser and fluoresces, it is detected by a photodetector (PMT). An electrical pulse (the voltage pulse) is generated and is processed by the signal processing electronics of the flow cytometer. Introduction to Flow Cytometry: A Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson
18 Flow Cytometer Electronics BD LSR II User s Guide; Becton Dickinson The voltage pulse height, width, and area are determined by the particle s size, speed, and fluorescence intensity. The pulse parameters are then acquired and analyzed in real-time by acomputer computer.
20 In Addition Some flow cytometers can sort cells into pre- determined subpopulations. An electrostatic charge is used to deflect a drop containing a fluorescently-labeled cell into one of three collection vessels.
22 Benchtop Flow Cytometers BD FACSCalibur BD LSR II
23 Flow Cell The flow cell is the flow chamber where the laser beam interrogates the particles passing within the sheath fluid. This is typically a closed system.
24 Nozzle Tip The flow chamber inside a cell sorter is stream-in- air, rather than laminar flow. This is typically an open system.
25 Differentiating Among Cell Types In the early days of flow cytometry, different cell types were identified based only on their light scattering characteristics. Even though thousands of cells could be rapidly detected, flow cytometry offered little more than what could be achieved by cell counters and microscopy. The introduction oducto of fluorochromes oc o into flow cytometry converted this otherwise limited method of cell detection into a powerful tool for the rapid differentiation of cells.
26 Fluorochrome-conjugated Antibodies Initially, fluorescent dyes commonly employed in microscopy were used to stain whole cells. However, dye uptake by cells was unreliable and led to problems with data reproducibility. Subsequently, antibodies were covalently bound to fluorochromes as a means of specifically and reliably labeling cells.
27 Basic Immunology Antibodies (immunoglobulins) are proteins used by the immune system to neutralize foreign invaders. They recognize, through specific binding, molecules called antigens. Antigens are ubiquitous in nature. They are found in the body, as well as in foreign invaders. The antibody-antigen interaction has many uses in the laboratory, including the specific identification of cells.
28 Polyclonal vs. Monoclonal Antibodies Polyclonal antibodies bind to multiple aspects of the same antigen. Their heterogeneity causes problems with standardization when used in flow cytometry. polyclonal antibodies Homogeneous monoclonal antibodies bind to only one aspect of an antigen and will reproducibly label cells. monoclonal antibodies Guide to Flow Cytometry; DakoCytomation
29 Immunophenotyping Monoclonal antibodies are used to recognize specific antigens on the surface of cells. These cell-surface markers characterize different cell types. Fluorochrome-tagged monoclonal antibodies brightly label cells for detection by the flow cytometer. Identification of cells using cell-surface markers is called immunophenotyping. Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson
30 Immunophenotyping In immunology, the use of fluorochrome-tagged monoclonal antibodies resulted in the discovery of phenotypically diverse T cell subsets. Regulatory T cell Dendritic cell Effector T cell This revolutionary observation made flow cytometry the preferred research tool of modern immunology.
31 Immunophenotyping Many cell surface features (as well as some internal characteristics) can be simultaneously assessed by employing different combinations of fluorochromes. Several uniquely colored fluorochromes are available to conduct such multicolor (multiparameter) experiments.
32 Immunophenotyping However, many fluorochromes possess overlapping emission wavelengths. BD LSR II User s Guide; Becton Dickinson
33 Compensation When the wavelengths of two fluorochromes overlap, the observed fluorescent signal detected by the flow cytometer may not be the actual signal displayed by the cell. In other words, the cell appears to possess a surface marker or phenotype that it does not actually have. Guide to Flow Cytometry; DakoCytomation
34 Compensation This fluorescence interference can be corrected for by adjusting the measurement parameters of the flow cytometer (either manually or automatically). This correction is termed compensation. In addition, this problem can be avoided by carefully selecting fluorochromes that do not overlap. BD LSR II User s Guide; Becton Dickinson
35 Data Analysis Flow cytometry is utilized both in the clinical lab and the research lab. Standardization has resulted in data that is reproducible across laboratories. Accurate data representation is key to this reproducibility. Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson This is a 2D dot plot; a commonly used method of data representation.
36 Data Analysis Flow cytometry computer software can generate data in the form of density yplots and contour plots. These graphical representations can sometimes be misleading. Introduction to Flow Cytometry: A Learning Guide; Becton Dickinson
37 Data Analysis Histograms are a common and reliable method used to present flow data for analysis. However, these graphs require advanced d software and are more visual than useful.
38 Gating To optimize the analysis of multiparameter experiments, gating g is performed to isolate cell subpopulations of interest. This step often eliminates the need to physically sort cells for further analysis.
39 Applications - Clinical Bone marrow cells are evaluated based on SSC and CD45 expression to diagnose acute lymphoblastic leukemia. normal patient patient with ALL Jennings, C. & Foon, K.(1997). Blood, 90(8),
40 Applications - Clinical CD4 + T cell counts are used to monitor the progression of AIDS in HIV-infected patients. t
41 Applications - Research A kinetics assay, such as Ca 2+ mobilization, can be performed using a fluorochrome, indo-1, that binds to calcium ions. Cells are loaded with indo-1 and then stimulated to mobilize Ca 2+. The UV laser excites the indo-1 and a fluorescent pulse is observed over time. BD LSR II User s Guide; Becton Dickinson
42 Applications - Research Several fluorochromes (DAPI, propidium iodide, 7-AAD AAD, etc.) bind directly to DNA and are used to estimate the amount of DNA present in a cell. The amount of DNA in a cell indicates whether or not it has entered the cell cycle.
43 Summary Flow cytometers measure cells based on their size, internal complexity, and fluorescence. Qualitative and quantitative analyses of cell populations have clinical and research applications. Successful experimental design depends on an understanding of flow cytometer instrumentation and basic immunological principles.
Introduction to flow cytometry Flow cytometry is a popular laser-based technology. Discover more with our introduction to flow cytometry. Flow cytometry is now a widely used method for analyzing the expression
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