presented by dr.mohammed attia director of flow cytometry facility tanta university
TRANSCRIPT
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Presented By
Dr.Mohammed AttiaDirector of flow cytometry Facility
Tanta University
Introduction To Flow Cytometry ApplicationsIntroduction To Flow
Cytometry Applications
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•FCM is a technique for counting, examining and sorting microscopic particles suspended in a fluid
• It allows simultanous analysis of the physical and /or chemical charactaristics of the examined particles
Definition Definition
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•FCM involves the analysis of flourescence and light scatter properties of single particle ( e.g. Cell, nuclei, chromosome, bacteria, bead ect) during its passage within a liquid stream
Basics Basics
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Light scatter
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Light scatter Neutrophils
Lymphocytes
Monocytes
Eosinophils
Basophils
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Light scatter
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To Distinguish Between 2 Cell typesA. Size Has To Be Different ORB. Internal Complexity
If These Two Parameters Are The Same, Then No Distinction Can Be Made
Limitations of Light Scatter
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Immuno Cytology
membranous /intracellular
structures
dye-coupled monoclonal
antibody (mab)
Y
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Multiparametric AnalysisMultiparametric Analysis
Simultaneous Detection of up to 20 Parameters
Cell size Cell structure Dyes up to 18 colors
Y
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Data display
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Data display
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Data display
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Advantages Analysis of high cell numbers (107 cells)
Short time of analysis (sec)
Gating allows detection of cell sub-populations
Measurement of rare events
Objective measurement of fluorescence intensity
Simultaneous detection of many parameters per cell
Advantages Analysis of high cell numbers (107 cells)
Short time of analysis (sec)
Gating allows detection of cell sub-populations
Measurement of rare events
Objective measurement of fluorescence intensity
Simultaneous detection of many parameters per cell
Flow cytometry
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Disadvantages
Relatively expensive technology
Test cell in suspension
Tissue architecture is lost
Disadvantages
Relatively expensive technology
Test cell in suspension
Tissue architecture is lost
Flow cytometry
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FCM SamplesFCM Samples Blood Bone
marrow BAL C S F Effusions Cell culture Sperms Tissue cells
e.g. tumor
Prerequisite
Single Cell Suspension
Prerequisite
Single Cell Suspension
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FCM APPLICATION
Research Laboratories
Clinical Laboratories
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FCM APPLICATION
Research Laboratories Immune function studies Hematopoietic stem cell research and
regenerative medicine Apoptosis Cell cycle and cell Kinetics Intracellular cytokine production Intracellular signaling Sperms and IVF Flow and FISH Microbiology and virology
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FCM APPLICATION
Clinical Laboratories Haematology Haemato-oncology Clinical immunology Organ transplantation and Stem
cell therapy Cancer Rare event applications Application in clinical microbiology
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Haematology
RBCs
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Haematology -RBCs
Autoantibodies in H A Fetal RBCs in fetomaternal hge Blood groups Membrane proteinsFragility of RBCs ( OFT)PNH
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PNH
• Principle of FCM: Absent or markedly diminished expression of glycosyl phosphatidylinositol-anchored protein (GPI-AP) on red cells and/or white cells in the appropriate clinical setting.
• GPI-AP - CD59 (MIRL) & CD55 (DAF)• Use two GPI-AP for confirmation
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Haematology
Blood transfusionQuality control of blood products
*Enumerate number of residual WBC contaminating
1- Leucodepleted RBCs unit 2- Platelets unit
*Enumerate number of residual WBC, RBC & platelets in FFP units
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PLATELETS
Haematology
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Platelets
GPIIb-IIIa CD41/CD61 GPIb-IX CD42b/CD42aGPIa-IIa CD49b/CD29GPIc-IIa CD49e/CD29GPIc-IIa CD49f/CD29 GPIIa CD31GPIV CD36GP53 CD63Vitronectinreceptor a CD51Vitronectinreceptor b CD61ThrombinreceptorThrombospondin
Thrombinreceptor
CD62p
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Haemato-oncology
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Haemato-oncology
# Acute leukemia
# LPD
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Acute leukemia's
ALL AMLM0M1M2M3M4M5M6M7
T-ALL B-ALLpre-T-ALL
Common-T-ALL
early T-ALL
mature T-ALL
pro-B-ALL
C-ALL
pre-B-ALL
B-ALL
BAL
Haemato-oncology
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# CLL
# NHL
( FCL, MCL, SLVL , LPL etc)
# Hairy cell leukaemia
Chronic Lymphoproliferative Disorders
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FCM in Haemato-oncologyDiagnosis and classification of L&L
Detect malignant cells
Define lineage (Myliod , T or B)
Sub-typing and classification
Prognosis (DNA Ploidy, CD38 & ZAP 70)
Follow up and therapy monitoring (MRD)
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Acute Leukaemia Panel
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LPD Panel
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Case study
Seven (7) year old, male patient, referred with Clinical history of Mediastinal Mass.
P B Examination showed high Leukocyte Count with 26% Blasts.
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Looking at this case display you can tell that there is an abnormal population (green) that is v.bright CD45 “brighter than normal lymphocytes” and has a high side scatter. There is almost no normal lymphocyte in this bone marrow specimen.
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This is a very informative slide and probably gave you the diagnosis already. Looking at the CD3/CD4/CD8 patterns we can see that the majority of the gated cells are dual positive for CD4/CD8 and negative for surface CD3. This pattern is very uncommon in bone marrow and indicate the immature T-cell nature of the blasts. Among the abnormal cells you can recognize the normal lymphocytes pattern (see red arrow).
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Looking at this slide we learn more about the nature of these cells. We find that they are negative for CD10,CD19,CD34,CD33,CD13 and positive for CD7. The later antibody “CD7” confirm the T cell lineage of the abnormal cells.
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The abnormal cells are positive for CD2 and CD11b and negative for HLA-DR. Usually in most cases of the T-cells they tend to be negative for HLA-DR. The positivity of CD11b is also atypical of this kind of malignancy.
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Again the abnormal cells continue to confirm its T-cell lineage; they are positive for CD56, CD5, partially CD1a and negative for CD117 and CD64. Usually the expression of CD56 in leukemias is associated with worse prognosis.
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The cytoplasmic staining of TdT and CD3 confirm the immature nature of the blasts.
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Antigen profile: Positive for CD4, CD8, CD7, CD2, CD5, CD56, partially CD1a, cCD3 and negative for HLA-DR. Diagnosis: Acute T-cell
Leukemia
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MRD# The lower level of disease (residual malignant cells) detectable in patients after therapy .
# Aberrant phenotypic pattern by FCM and Leukemic cell DNA OR RNA by PCR are the most widely used as they have the most sensitive and specific level
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MRD detection by FCM
ALL
It requires the identification of specific pattern of
Ags at presentation which then sought at follow up
T-ALL (TdT and CD3) reliable up to 1 in 104
since normal BM doesnt contain it
B-ALL (19, 34, 10 &TdT, 20,38,58,45 )
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MRD detection by FCM
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FCM APPLICATION
Immunology
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#Lymphocyte Sub-setting: T,B & NK cells (CD3/CD4/CD8/CD19/CD16+56) * HIV patient monitoring * SCID patients * Immuno compromised patients
FMC IN IMMUNOLOGY
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#T cell function assay FCM can assess lymphocyte activation of
* T helper CD4 cells * T cytotoxic CD8 cells
FMC IN IMMUNOLOGY
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Applying Gates for sub-population analysis
Simple gating stratagies…Whole blood light scatter
Gate on lymphocytes
(light scatter)
Assess T-cell population
(fluorescence)
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…to more complex!
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#Neutrophil Functional assay Number of ready to use kits are available assess Neutrophil
* Migratest (measure chemotactic & adhesion)
* Phagotest (determine phagocytic activity)
* Oxidative Burstest (Quantify oxidative burst
activity)
FMC IN IMMUNOLOGY
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FCM APPLICATION
Organ transplantation
and
Stem cell therapy
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FCM APPLICATION
Organ transplantation and Stem cell therapy
Stem cell enumeration -HSC Banking -HSC Transplantation HLA cross matching Pre & Post Transplantation
monitoring of immune system
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• Stem Cell enumeration
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FCM APPLICATION
Cancer
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FCM APPLICATION
Cancer DNA Ploidy and cell cycle kinetics MDR Circulating Tumor cells ( CTCs)
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FCM APPLICATION
DNA analysis:
Aneuploidy and/or elevated S-phase
fraction have been shown to be
prognostic indicators in breast,
colon, rectal, prostate, ALL and
bladder tumors.
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Cell Cycle Analysis
Note the cell volume (size) and DNA concentration change as the cell progresses through the cell cycle
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Cell Cycle Analysis
DNA probes
DAPI }
Hoechst } UV
Propidium iodide (PI) }
7-AAD } 488
TOPRO-3 }
DRAQ5 } 633
These dyes are stoichiometric – number of bound molecules are equivalent to the number of DNA molecules present
The cell cycle
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l
Typical DNA histogram
Stoichiometric DNA probe binding
Cell Cycle Analysis
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Cell Cycle Analysis
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Assessing cell proliferation using FCM
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APOPTOSIS AND
CELL VIABILITY
FCM APPLICATION
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Apoptosis• Gene directed cell death
• An event that occurs during development and a response to trauma or disease
• Cancer cells develop a strategy to evade apoptosis
Apoptosis results in a number of cellular events that can be analysed by FACS:
• Fragmentation of DNA (subG1 assay, Hoechst dyes)
• Membrane structure and integrity Annexin-V, PI)
• Mitochondrial function (Mitotracker Red)
• Caspase activity (antibodies assay)
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Sub G1 apoptosis assay
Sub-G1 peakDNA fragmentation allows apoptosis to be quickly assessed with eg. PI
Can be seen as a population of small peaks to the left of G1 in a histogram
Quick and easy way to determine if apoptosis is occurring
Apoptosis
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Apoptosis detection using viability dye uptake
Changes in membrane permeability due to apoptosis allow intracellular dyes to stain unfixed cells
7-AAD (DNA)
Live cells exclude dye
Apoptotic cells stain 7-AADdim
Dead cells stain 7-AADbright
Apoptosis
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Annexin-V/PI assay for apoptosis:
hPS normally on inside of cellular membrane hAnnV can bind to externalised PS highlighting cells that are apoptotic hPI will only go into cells with compromised membranes – dead (necrotic) cells
AnnV-FITC
PS
X
X
X
X
X
X
PI
Apoptosis
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• Membrane potential of the organelle reduced
• Mitochondrial activity appears to change in parallel with cytoplasmic and plasma membrane events
• Dyes that accumulate in mitochondria can therefore play role in detecting apoptosis
-Mitotracker Red CMXRos
-JC-1
-DiOC2(3)
-Laser Dye Styryl-751 (LDS-751)
• Reagent combinations can provide a window on intracellular processes not available with the much used pairing of annexin V and propidium iodide
• Apoptosis – Organelle Analysis
Apoptosis
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Live/Dead assay
Utilise the properties of dyes that are impermeable to intact cell membranes:
Propidium iodide
DAPI
TOPRO-3
+ve fluorescence indicates compromised cell membranes and therefore dead cells
Yeast cells + TOPRO-3
Dead cells show more granularity and reduced size
Live cells retain their morphology and appear larger in size and less granular
Apoptosis
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CELL SORTING
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Cell sorting
Allows rare
populations to be
isolated from
heterogenous
populations (cell
culture, blood
samples, etc)
Can isolate sub
cellular particles
(e.g. endosomes,
nucleus,
chromosomes)
Can produce purity
>95%
Cell Sorting
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Thank You