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FLOW CYTOMETRY
BY- SUNANDA ARYA
CONTENTS
FLOW
CYTOMETRY
2
INTRODUCTION
PRINCIPLE
INSTRUMENTATION
HYDRODYNAMIC FOCUSING
LIGHT SCATTERING
FLUORESCENCE
FLOW CYTOMETRY BASIC PROTOCOL
APPLICATIONS
LIMITATIONS
APOPTOSIS AND CELL CYCLE ANALYSIS BY
FLOW CYTOMETRY
INTRODUCTION
FLOW
CYTOMETRY
3
Flow cytometry is the measuring (metry) of cells (cyto) as they
flow (cells in motion) past a detecting device.
The technique of flow cytometry is used to evaluate cells for a
number of functions, such as cell counting, phenotyping, cell
cycle analysis, and viability.
Flow cytometry is a standard laser-based technology that is used
in the detection and measurement of physical and chemical
characteristics of cells or particles in a heterogeneous fluid
mixture.
• The use of flow cytometry has increased over the years as it provides a
rapid analysis of multiple characteristics (both qualitative and
quantitative) of the cells.
• The properties that can be measured by this process include a particle’s
size, granularity or internal complexity, and fluorescence intensity.
• These characteristics are determined using an optical-to-electronic
coupling system that detects the cells based on laser scattered by the
cells.
• A flow cytometer, despite its name, does not necessarily deal with cells; it
deals with cells quite often, but it can also deal with chromosomes or
molecules or many other particles that can be suspended in a fluid.
4
FLOW
CYTOMETRY
PRINCIPLE
• Flow cytometry (FCM) is a sophisticated technique that works on the principle of
light scattering and fluorescence emission by the specific fluorescent probe-
labeled cells as they pass through a laser beam.
• It offers several unique advantages as it allows fast, relatively quantitative,
multiparametric analysis of cell populations at the single cell level.
5
FLOW
CYTOMETRY
INSTRUMENTATION OF FLOW
CYTOMETRY
• A flow cytometer is made up of three main systems: fluidics, optics
system, and electronics system.
6
FLOW
CYTOMETRY
7
FLOW
CYTOMETRY
HYDRODYNAMIC FOCUSING
• The analysis of cells /particles one at a time in a moving fluid stream. The
system uses liquid (hydro) to force the cells to travel at the same speed and to
travel as single cells in hydrodynamic focusing, a faster-moving sheath fluid
(which is simply a saline solution) is used to force the sample into a smaller
core stream (also called hydrodynamic core) so that all particles are travelling
along the same axis at approximately the same velocity.
• Best way for generating the most accurate data is to run the cells at a low
concentration and as slowly as possible.
8
FLOW
CYTOMETRY
HYDRODYNAMIC
FOCUSING
The sample pressure and the sheath fluid pressure are different
from each other. The sample pressure is always greater than the
sheath fluid pressure. The sample pressure regulator controls
the sample flow rate by changing the sample pressure relative to
the sheath pressure.
9
FLOW
CYTOMETRY
P = P sheath – P core
Changing P would change the flow rate.
LIGHT SCATTERING
• Light scattering results when a particle deflects incident laser light. The extent
to which this happens depends on the physical properties of a particle,
namely its size and internal complexity.
• Forward-scattered light (FSC) is proportional to the cell-surface area or size of
the cell. It is a measurement of mostly diffracted light and detects rays that
are just off the axis of the incident laser beam dispersed in the forward
direction by a photodiode.
• Side-scattered light (SSC) indicates the cell granularity or internal complexity
of the cells. SSC is a measurement of mostly refracted and reflected light that
occurs at any interface within the cell where there is a change in the refractive
index.
• The measurements of FSC and SSC are used for the differentiation of cell
1 0
FLOW
CYTOMETRY
FSC approximately proportional to particle
size . SSC linked to granularity and internal
complexity , it is measured at about 90’c to
the light source.
When FSC and SSC signals are correlated it
1 1
FLOW
CYTOMETRY
FLUORESCENCE
• Fluorescent markers used to detect the expression of cellular molecules
such as proteins or nucleic acids in a system.
• The fluorescent compound absorbs light energy over a range of
wavelengths that is characteristic of that compound.
• In a mixed population of cells, different fluorochromes can be used to
distinguish separate subpopulations.
• The fluorescence pattern of each subpopulation, combined with FSC and
SSC data, can be used to identify which cells are present in a sample and
to count their relative percentages.
• The electronics system then converts the detected light signals into
electronic signals that can be processed by the computer.
1 2
FLOW
CYTOMETRY
FLOW CYTOMETRY BASIC
PROTOCOL
• Biological sample
1 3
FLOW
CYTOMETRY
Biological Sample
Label with a fluorescent marker
Cells move in a linear stream through a focused light source
(laser beam)
Fluorescent molecule gets activated and emits light that is filtered and
detected by sensitive light detectors (usually a photomultiplier tube)
Conversion of analog fluorescent signals to digital signals
APPLICATIONS
• Cell Counting and Characterization: Using surface markers, size, and shape,
flow cytometry may be utilized to count and categorize various cell kinds and
populations.
• Analysis of cell surface markers: To investigate the behavior and interactions
of cells, flow cytometry may be used to locate and measure cell surface
markers, such as antigens and receptors.
• Cell sorting: Using flow cytometry, certain cell populations may be separated
and purified depending on their surface markers or other factors, enabling
additional research or testing.
• Multiparameter analysis: It may assess numerous parameters concurrently
on a single cell, giving complicated biological material a through
examination.
• Detection of aberrant cells: It can be used to detect and quantify the aberrant
or abnormal cells.
1 4
FLOW
CYTOMETRY
• Investigation of immune cell function: Using flow cytometry, researchers may
examine how immune cells produce cytokines, engage in phagocytosis, and
move across the body.
• Cell signaling analysis: It may be used to examine how particular signaling
pathways are activated in response to different stimuli, offering crucial
insights into cellular processes.
• The different stages of cell death, apoptosis, and necrosis can be detected
by flow cytometers based on the differences in the morphological and
biochemical changes.
• Flow cytometers allow the analysis of replication cells by using fluorescent
dye for four different stages of the cell cycle.
1 5
FLOW
CYTOMETRY
LIMITATIONS
• This process doesn’t provide information on the intracellular location or
distribution of proteins.
• Over time, debris is aggregated, which might result in false results.
• The pre-treatment associated with sample preparation and staining is a time-
consuming process.
• Flow cytometry is an expensive process that requires highly qualified
technicians.
1 6
FLOW
CYTOMETRY
APOPTOSIS AND CELL CYCLE ANALYSIS
BY FLOW CYTOMETRY
• Rotenone, a neurotoxin that crosses the bloodbrain barrier and inactivates
complex I of the mitochondrial electron transport chain results in increased ROS
production and causes neurodegeneration and apoptosis (Bueler, 2009).
• SH-SY5Y neuroblastoma cells were selected as it resembles immature
sympathetic neuroblasts in culture (Biedler et al., 1978).
• Trichoderma, a biocontrol agent, was selected for the biosynthesis of CeO2
NPs.
• Based on this background, the present study was aimed to synthesize
CeO2NPs using Trichoderma sp. and to evaluate its neuroprotective effect
against rotenone-induced cytotoxicity in human neuroblastoma cells.
1 7
FLOW
CYTOMETRY
ANNEXIN V & PI PRICIPLE
• Phospholipids of the cell membrane are asymmetrically distributed between the
inner and outer leaflets of the membrane. Phosphatidylcholine and
sphingomyelin are exposed on the external leaflet of the lipid bilayer, while
phosphatidylserine is located on the inner surface.
•During apoptosis, this asymmetry is disrupted and phosphatidylserine becomes
exposed on the outside surface of the plasma membrane. Because the
anticoagulant protein Annexin V binds with high affinity to phosphatidylserine,
fluorochrome-conjugated Annexin Vcan been used to detect apoptotic cells by
flow cytometry. Annexin V is commercially available, conjugated to most common
fluorochromes Propidium iodide (PI).
Propidium iodide (PI) staining is a viability dye flow cytometry method used to
assess cell viability. PI staining can provide information about the cell cycle and
DNA content of the population. It is a membrane impermeant dye that is generally
excluded from viable cells. It binds to double stranded DNA by intercalating
between base pairs.
1 8
FLOW
CYTOMETRY
PROTOCOL
• SH-SY5Y cells were harvested and then washed twice with ice-cold PBS.
• The washed cells were re-suspended in binding buffer followed by mixing
with Annexin V-FITC and PI.
• The cells were incubated in the dark for 30 min at room temperature.
Samples were analyzed with the aid of flow cytometry (BD FACSLyricTM).
• The cell cycle was examined by PI staining
1 9
FLOW
CYTOMETRY
• SH-SY5Y cells were seeded in 96-well plates and processed as mentioned
above, then harvested and fixed with 70% ethanol at 4℃ overnight.
• Then, the cells were resuspended in 500μL propidium iodide staining
solution (50 μg/mL PI, 0.1 mg/mL RNase A, 0.05 % Triton X-100) for 40 min
at 37 °C.
• After the incubation period, the cell pellet was washed with PBS and
resuspended in 500 μL PBS for FACScan flow cytometer analysis (BD
FACSLyricTM).
2 0
FLOW
CYTOMETRY
2 1
FLOW
CYTOMETRY
Flow cytometry was used to detect apoptotic cells after Annexin V-FITC/PI double staining. In each plot, Q1
represents the percent of necrotic cells, Q2 indicates percent of late apoptotic cells, Q3 displays percent of live cells,
Q4 shows percent of early apoptotic cells.
Annexin V negative - PI negative populations are healthy cells.
Annexin V positive - PI negative populations represent cells in early apoptosis.
Annexin V positive - PI positive staining indicate cells are in necrosis (post-apoptotic necrosis
or late apoptosis).
2 2
FLOW
CYTOMETRY
Our investigation of cell-cycle distribution revealed that G2/M phase cell cycle arrest was observed in
rotenone-treated SH-SY5Y cells. Comparable to our results, previous studies have described that rotenone
induces G2/M arrest in SH-SY5Y cells (Wang and Xu, 2005). CeO2 NPs treatment decreased the
percentage of G2/M cells and increased G1/G0/S cells which indicate that CeO2 NPs interfere with
rotenone-mediated cell cycle arrest.
REFERENCES:
• Biotech, M. (2018). Flow cytometry instrumentation – an overview. Current
Protocols in Cytometry, e52. DOI: 10.1002/cpcy.52
• McKinnon K. M. (2018). Flow Cytometry: An Overview. Current protocols in
immunology, 120, 5.1.1–5.1.11. https://doi.org/10.1002/cpim.40
• Dean, P.N. and Hoffman, R.A. (2007), Overview of Flow Cytometry
Instrumentation. Current Protocols in Cytometry, 39: 1.1.1-1.1.8.
DOI:1002/0471142956.cy0101s39
• https://enquirebio.com/flow-cytometry
• https://www.rndsystems.com/resources/protocols/flow-cytometry-protocol-
staining-membrane-associated-proteins-suspended-cells
• https://medicine.yale.edu/immuno/flowcore/protocols/analysis/
• https://nanocellect.com/blog/breaking-down-the-principles-of-flow-cytometry/
• Neuroprotective Effect of Biogenic Cerium Oxide Nanoparticles Against
Rotenone-Induced Neurotoxicity in SH-SY5Y Cells
2 3
FLOW
CYTOMETRY
THANK YOU

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FLOW CYTOMETRY -SUNANDA ARYA.pptx

  • 2. CONTENTS FLOW CYTOMETRY 2 INTRODUCTION PRINCIPLE INSTRUMENTATION HYDRODYNAMIC FOCUSING LIGHT SCATTERING FLUORESCENCE FLOW CYTOMETRY BASIC PROTOCOL APPLICATIONS LIMITATIONS APOPTOSIS AND CELL CYCLE ANALYSIS BY FLOW CYTOMETRY
  • 3. INTRODUCTION FLOW CYTOMETRY 3 Flow cytometry is the measuring (metry) of cells (cyto) as they flow (cells in motion) past a detecting device. The technique of flow cytometry is used to evaluate cells for a number of functions, such as cell counting, phenotyping, cell cycle analysis, and viability. Flow cytometry is a standard laser-based technology that is used in the detection and measurement of physical and chemical characteristics of cells or particles in a heterogeneous fluid mixture.
  • 4. • The use of flow cytometry has increased over the years as it provides a rapid analysis of multiple characteristics (both qualitative and quantitative) of the cells. • The properties that can be measured by this process include a particle’s size, granularity or internal complexity, and fluorescence intensity. • These characteristics are determined using an optical-to-electronic coupling system that detects the cells based on laser scattered by the cells. • A flow cytometer, despite its name, does not necessarily deal with cells; it deals with cells quite often, but it can also deal with chromosomes or molecules or many other particles that can be suspended in a fluid. 4 FLOW CYTOMETRY
  • 5. PRINCIPLE • Flow cytometry (FCM) is a sophisticated technique that works on the principle of light scattering and fluorescence emission by the specific fluorescent probe- labeled cells as they pass through a laser beam. • It offers several unique advantages as it allows fast, relatively quantitative, multiparametric analysis of cell populations at the single cell level. 5 FLOW CYTOMETRY
  • 6. INSTRUMENTATION OF FLOW CYTOMETRY • A flow cytometer is made up of three main systems: fluidics, optics system, and electronics system. 6 FLOW CYTOMETRY
  • 8. HYDRODYNAMIC FOCUSING • The analysis of cells /particles one at a time in a moving fluid stream. The system uses liquid (hydro) to force the cells to travel at the same speed and to travel as single cells in hydrodynamic focusing, a faster-moving sheath fluid (which is simply a saline solution) is used to force the sample into a smaller core stream (also called hydrodynamic core) so that all particles are travelling along the same axis at approximately the same velocity. • Best way for generating the most accurate data is to run the cells at a low concentration and as slowly as possible. 8 FLOW CYTOMETRY
  • 9. HYDRODYNAMIC FOCUSING The sample pressure and the sheath fluid pressure are different from each other. The sample pressure is always greater than the sheath fluid pressure. The sample pressure regulator controls the sample flow rate by changing the sample pressure relative to the sheath pressure. 9 FLOW CYTOMETRY P = P sheath – P core Changing P would change the flow rate.
  • 10. LIGHT SCATTERING • Light scattering results when a particle deflects incident laser light. The extent to which this happens depends on the physical properties of a particle, namely its size and internal complexity. • Forward-scattered light (FSC) is proportional to the cell-surface area or size of the cell. It is a measurement of mostly diffracted light and detects rays that are just off the axis of the incident laser beam dispersed in the forward direction by a photodiode. • Side-scattered light (SSC) indicates the cell granularity or internal complexity of the cells. SSC is a measurement of mostly refracted and reflected light that occurs at any interface within the cell where there is a change in the refractive index. • The measurements of FSC and SSC are used for the differentiation of cell 1 0 FLOW CYTOMETRY
  • 11. FSC approximately proportional to particle size . SSC linked to granularity and internal complexity , it is measured at about 90’c to the light source. When FSC and SSC signals are correlated it 1 1 FLOW CYTOMETRY
  • 12. FLUORESCENCE • Fluorescent markers used to detect the expression of cellular molecules such as proteins or nucleic acids in a system. • The fluorescent compound absorbs light energy over a range of wavelengths that is characteristic of that compound. • In a mixed population of cells, different fluorochromes can be used to distinguish separate subpopulations. • The fluorescence pattern of each subpopulation, combined with FSC and SSC data, can be used to identify which cells are present in a sample and to count their relative percentages. • The electronics system then converts the detected light signals into electronic signals that can be processed by the computer. 1 2 FLOW CYTOMETRY
  • 13. FLOW CYTOMETRY BASIC PROTOCOL • Biological sample 1 3 FLOW CYTOMETRY Biological Sample Label with a fluorescent marker Cells move in a linear stream through a focused light source (laser beam) Fluorescent molecule gets activated and emits light that is filtered and detected by sensitive light detectors (usually a photomultiplier tube) Conversion of analog fluorescent signals to digital signals
  • 14. APPLICATIONS • Cell Counting and Characterization: Using surface markers, size, and shape, flow cytometry may be utilized to count and categorize various cell kinds and populations. • Analysis of cell surface markers: To investigate the behavior and interactions of cells, flow cytometry may be used to locate and measure cell surface markers, such as antigens and receptors. • Cell sorting: Using flow cytometry, certain cell populations may be separated and purified depending on their surface markers or other factors, enabling additional research or testing. • Multiparameter analysis: It may assess numerous parameters concurrently on a single cell, giving complicated biological material a through examination. • Detection of aberrant cells: It can be used to detect and quantify the aberrant or abnormal cells. 1 4 FLOW CYTOMETRY
  • 15. • Investigation of immune cell function: Using flow cytometry, researchers may examine how immune cells produce cytokines, engage in phagocytosis, and move across the body. • Cell signaling analysis: It may be used to examine how particular signaling pathways are activated in response to different stimuli, offering crucial insights into cellular processes. • The different stages of cell death, apoptosis, and necrosis can be detected by flow cytometers based on the differences in the morphological and biochemical changes. • Flow cytometers allow the analysis of replication cells by using fluorescent dye for four different stages of the cell cycle. 1 5 FLOW CYTOMETRY
  • 16. LIMITATIONS • This process doesn’t provide information on the intracellular location or distribution of proteins. • Over time, debris is aggregated, which might result in false results. • The pre-treatment associated with sample preparation and staining is a time- consuming process. • Flow cytometry is an expensive process that requires highly qualified technicians. 1 6 FLOW CYTOMETRY
  • 17. APOPTOSIS AND CELL CYCLE ANALYSIS BY FLOW CYTOMETRY • Rotenone, a neurotoxin that crosses the bloodbrain barrier and inactivates complex I of the mitochondrial electron transport chain results in increased ROS production and causes neurodegeneration and apoptosis (Bueler, 2009). • SH-SY5Y neuroblastoma cells were selected as it resembles immature sympathetic neuroblasts in culture (Biedler et al., 1978). • Trichoderma, a biocontrol agent, was selected for the biosynthesis of CeO2 NPs. • Based on this background, the present study was aimed to synthesize CeO2NPs using Trichoderma sp. and to evaluate its neuroprotective effect against rotenone-induced cytotoxicity in human neuroblastoma cells. 1 7 FLOW CYTOMETRY
  • 18. ANNEXIN V & PI PRICIPLE • Phospholipids of the cell membrane are asymmetrically distributed between the inner and outer leaflets of the membrane. Phosphatidylcholine and sphingomyelin are exposed on the external leaflet of the lipid bilayer, while phosphatidylserine is located on the inner surface. •During apoptosis, this asymmetry is disrupted and phosphatidylserine becomes exposed on the outside surface of the plasma membrane. Because the anticoagulant protein Annexin V binds with high affinity to phosphatidylserine, fluorochrome-conjugated Annexin Vcan been used to detect apoptotic cells by flow cytometry. Annexin V is commercially available, conjugated to most common fluorochromes Propidium iodide (PI). Propidium iodide (PI) staining is a viability dye flow cytometry method used to assess cell viability. PI staining can provide information about the cell cycle and DNA content of the population. It is a membrane impermeant dye that is generally excluded from viable cells. It binds to double stranded DNA by intercalating between base pairs. 1 8 FLOW CYTOMETRY
  • 19. PROTOCOL • SH-SY5Y cells were harvested and then washed twice with ice-cold PBS. • The washed cells were re-suspended in binding buffer followed by mixing with Annexin V-FITC and PI. • The cells were incubated in the dark for 30 min at room temperature. Samples were analyzed with the aid of flow cytometry (BD FACSLyricTM). • The cell cycle was examined by PI staining 1 9 FLOW CYTOMETRY
  • 20. • SH-SY5Y cells were seeded in 96-well plates and processed as mentioned above, then harvested and fixed with 70% ethanol at 4℃ overnight. • Then, the cells were resuspended in 500μL propidium iodide staining solution (50 μg/mL PI, 0.1 mg/mL RNase A, 0.05 % Triton X-100) for 40 min at 37 °C. • After the incubation period, the cell pellet was washed with PBS and resuspended in 500 μL PBS for FACScan flow cytometer analysis (BD FACSLyricTM). 2 0 FLOW CYTOMETRY
  • 21. 2 1 FLOW CYTOMETRY Flow cytometry was used to detect apoptotic cells after Annexin V-FITC/PI double staining. In each plot, Q1 represents the percent of necrotic cells, Q2 indicates percent of late apoptotic cells, Q3 displays percent of live cells, Q4 shows percent of early apoptotic cells. Annexin V negative - PI negative populations are healthy cells. Annexin V positive - PI negative populations represent cells in early apoptosis. Annexin V positive - PI positive staining indicate cells are in necrosis (post-apoptotic necrosis or late apoptosis).
  • 22. 2 2 FLOW CYTOMETRY Our investigation of cell-cycle distribution revealed that G2/M phase cell cycle arrest was observed in rotenone-treated SH-SY5Y cells. Comparable to our results, previous studies have described that rotenone induces G2/M arrest in SH-SY5Y cells (Wang and Xu, 2005). CeO2 NPs treatment decreased the percentage of G2/M cells and increased G1/G0/S cells which indicate that CeO2 NPs interfere with rotenone-mediated cell cycle arrest.
  • 23. REFERENCES: • Biotech, M. (2018). Flow cytometry instrumentation – an overview. Current Protocols in Cytometry, e52. DOI: 10.1002/cpcy.52 • McKinnon K. M. (2018). Flow Cytometry: An Overview. Current protocols in immunology, 120, 5.1.1–5.1.11. https://doi.org/10.1002/cpim.40 • Dean, P.N. and Hoffman, R.A. (2007), Overview of Flow Cytometry Instrumentation. Current Protocols in Cytometry, 39: 1.1.1-1.1.8. DOI:1002/0471142956.cy0101s39 • https://enquirebio.com/flow-cytometry • https://www.rndsystems.com/resources/protocols/flow-cytometry-protocol- staining-membrane-associated-proteins-suspended-cells • https://medicine.yale.edu/immuno/flowcore/protocols/analysis/ • https://nanocellect.com/blog/breaking-down-the-principles-of-flow-cytometry/ • Neuroprotective Effect of Biogenic Cerium Oxide Nanoparticles Against Rotenone-Induced Neurotoxicity in SH-SY5Y Cells 2 3 FLOW CYTOMETRY