flow cytometry core a resource of the section of immunobiology, department of internal medicine, and...
TRANSCRIPT
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Flow Cytometry Core
A Resource of the Section of Immunobiology,
Department of Internal Medicine, and the YCCC
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Presentation Overview
• Flow cytometry background and technical review
• Yale Flow Core: history, capabilities, people, and operation.
• Use of flow cytometry to study memory B cells in my own lab.
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What is Flow Cytometry?
• The analysis of single cells, particles, or other discrete elements as they flow past one or more focused light sources based on reflected, scattered, or fluorescent light generated by those light sources.
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Flow CellFlow Cell
Injector Tip
FluorescenceFluorescencesignalssignals
Focused laserFocused laserbeambeam
Sheath fluid
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Forward Angle Light ScatterForward Angle Light Scatter
FALS Sensor
Laser
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90 Degree Light Scatter90 Degree Light Scatter
FALS Sensor
90LS Sensor
Laser
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Laser
Fluorescence DetectorsFluorescence Detectors
Freq
Fluorescence
FALS Sensor
Fluorescence detector(PMT3, PMT4 etc.)
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488 nm laser
+
Fluorescence Activated Fluorescence Activated Cell SortingCell Sorting
Charged Plates-Attract and focusdroplets of oppositecharge
Single droplets sortedinto test tubes
FALS Sensor
Fluorescence detector
Computer analysis of detector data- “gating”
leads to + or - charging of droplet
-
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Optical Optical FiltersFiltersDichroic Filter/Mirror at
45 deg
Reflected light
Transmitted Light
Light Source
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Standard Band Pass FiltersStandard Band Pass Filters
Transmitted LightWhite Light Source
630 nm BandPass Filter
620 -640 nm Light
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Standard Long Pass Standard Long Pass FiltersFilters
Transmitted LightTransmitted LightLight SourceLight Source520 nm Long Pass Filter520 nm Long Pass Filter
>520 nm >520 nm LightLight
Transmitted LightTransmitted LightLight SourceLight Source575 nm Short Pass Filter575 nm Short Pass Filter
<575 nm <575 nm LightLight
Standard Short Pass FiltersStandard Short Pass Filters
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PMT
PMT
PMT
PMT
DichroicFilters
BandpassFilters
Flow Cytometry OpticsFlow Cytometry Optics
Laser
1
2
3
4
Flow cell
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What can flow be used for?
• Expression of cell surface or intracellular proteins or neo-epitopes such as phospho-proteins generated via cell signaling (after permeabilization) using fluorescently tagged Abs.
• Use of small molecule, protein, or particle-based probes to detect: Ca++ flux, pH, mitochondrial polarization (apoptosis surrogate), caspase activation, cell division via dye dilution (e.g. CFSE), phagocytosis, DNA content (cell cycle analysis) or proliferation (BrdU incorporation).
• Detection of intrinsic cell fluorescence based on expression of fluorescent proteins from reporter constructs.
• Analysis of cell size and complexity using light scatter.• Multiparameter analysis to determine cellular heterogeneity
and to link properties to cell phenotypes in complex mixtures.
• Quantitative technique to enumerate specific cell types.• Preparative method that can combine any of the above
techniques isolate cells or even subcellular fractions at a rate of up to 50K events/second.
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The Yale Flow Facility
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History• Began as 1 FACScan and FACStar plus, supported by HHMI and Section of Immunobiology.
• FACScalibur added in 94.• FACSVantage in 98.• FACS-DIVA upgrade in 2001-provided gratis by BD.• Winter 2002: Current core opened in TAC with space and instruments contributed by Internal Medicine and purchase of additional used MoFlo by YSM. Custom-built rooms.
• Initial configuration: 1 FACScan, 4 FACSCaliburs (3 from Int. Med), 2 sorters.
• Shared Instrument Grant for FACSAria in 2003.• Fall of 2004: Purchase of LSRII-with UV capability for DNA analysis.
• November 2004: YCCC merger completed.
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Instrumentation• FACS Analysis:
– 3 Color analysis: FACScan– 4 Color analysis: 4 FACScaliburs– 11-Color analysis: LSRII (new)
• Sorters:FACSVantage DIVA: hi-speed digital stream in air sorter with UV, 488, 633; 4-way sort; cloning; aerosol containment.
MoFlo: hi-speed digital stream in air sorter with 488, 633; cloning
FACSAria: hi-speed digital cuvette sorter with 407, 488, 633; hi sensitivity, 13-color; 4-way sort; cloning; aerosol containment
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TAC Building Room S617
31’
15’ 15’
7’-10” 7’-10”7’-10”
2’ 2’ 2’ 2’
2’ 2’
FA
CS
Aria
/Com
pute
r
8’-9
”W x
4’-5
”D
Desk4’-7”W x 2’-6”D
MoFlo3’ D x 6’ W
2’ W x 2’D
FACS Vantage 4’ D x 3’ W
3’ W x 3’ D
Fili
ng
Ca
bin
et
2
’ W x
5’ D
2’-6
”
10’ 10’4’-7”
2’-6
”
Scale 0.3”-1’ - Bench Space
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Lasers and ColorsInstruments Laser Excitation Laser Line (nm) Fluorescence Channel FluorochromesBD FACScan Argon (L1) 488 FL1 Green FITC Alexa Fluor 488
FL2 Yellow PE PI EMAFL3 Red PE-Texas Red PE-Cy5 PerCP PerCP-Cy5.5 PE-Cy7
BD FACSCalibur Argon (L1) 488 FL1 Green FITC Alexa Fluor 488FL2 Yellow PEFL3 Red PE-Texas Red PE-Cy5 PerCP PerCP-Cy5.5 PE-Cy7
Red Diode (L2) 635 FL4 Red APC Alexa Fluor 647BD FACSVantage Argon (L1) 488 FL1 Green FITC Alexa Fluor 488
FL2 Yellow PE PI EMAFL3 Red PE-Texas Red PE-Cy5 PerCP PerCP-Cy5.5 PE-Cy7FL6 UV Hoechst Alexa 350 Indo-1
HeNe (L2) 633 FL4 Red APC Alexa Fluor 647FL5 InfraRed APC-Cy7
BD FACSAria Argon (L1) 488 Green FITC Alexa Fluor 488Yellow PERed PE-Texas Red PE-Cy5 PerCP PI EMAFar Red PerCP-Cy5.5Infra Red PE-Cy7
HeNe (L2) 633 Red APC Alexa Fluor 647Infra Red APC-Cy7
Violet (L3) 407 Infra Red Alexa Fluor 405 Pacific BlueBD LSR II Argon (L1) 488 Green FITC Alexa Fluor 488
Yellow PERed PE-Texas Red PE-Cy5 PerCP PI EMAFar Red PerCP-Cy5.5Infra Red PE-Cy7
HeNe (L2) 633 FL4 Red APC Alexa Fluor 647Infra Red APC-Cy7
UV (L3) 355 VioletBlue Alexa Fluor 405 Pacific Blue
Violet (L4) 407 Blue Alexa Fluor 405 Pacific BlueCytomation MoFlo Argon (L1) 488 Green FITC Alexa Fluor 488
Yellow PE PI EMARed PE-Texas Red PE-Cy5 PerCPFar Red PerCP-Cy5.5Infra Red PE-Cy7
HeNe (L2) 633 FL4 Red APC Alexa Fluor 647Infra Red APC-Cy7
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Capabilities and Techniques
• User operated 3, 4, and 11-color analysis.• Technician-assisted analysis on request for an additional fee.
• Multicolor hi-speed digital sorting:– 4-way– Cloning/single cell or multicell– Sterile– UV, 407, 488, and 633 laser lines– Operator performs most sorts; user-operation an option for experienced FACS Aria users.
• Techniques: cell surface markers, cytokines, intracellular staining, live-dead discrimination, Ca++-signaling, DNA/cell cycle analysis, FRET, subcellular fractions, detection of almost any fluorescent molecule.
• Assistance with data analysis: two workstations with appropriate software.
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Personnel• Mark Shlomchik has run facility for the last 7 yrs. Currently my 5% effort is supported by a PPG on which I am one of the PIs.
• Two sorter operators paid by effectively 50% by HHMI: Tom Taylor and Gouzel Tokmoulina.
• One R+D tech who supervises FACS Aria and analyzers: Geoff Lyon.
• One new R+D tech who oversees the analyzers, billing and training: Don Foster.
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User Support and Resources• Consultation on sorts, analysis, etc.
before, during or after the experiment, as needed, no charge.
• Regular training sessions for all instruments.
• Broadcast announcements via email about new policies, unexpected downtime, etc.
• Sponsorship of training seminars on data analysis, new reagents, techniques.
• Negotiated discounts with a variety of vendors.
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User Support and Resources• New web site: designed and
maintained by Gouzel Tokmoulina.– Description of equipment– Facility rules– Sign-up– Resources and information
• Web-based scheduling for all analyzers.
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Usage Statistics
• Analysis: ~950 hr./month• Sorting: ~325 hr./month• 119 Active laboratories• >486 Registered individual users
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Budget
• Sources of income– User fees: ~$440K– YCCC: $39K– HHMI: ~$112K
• Costs– Salaries: ~$300K/yr. Salary+fringe for 4 people and administrative support.
– Maintenance contracts: $135K/yr. (some deferred due to prepaid contracts.
– Other: ~$25K/yr.
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Breakdown of Key Fees
• User-operated analysis: $14/hr.• User-operated LSRII or Aria (analysis only): $22/hr.
• Operator-performed sorting or analysis: $68/hr.
• Training: $30/hr. for up to three people (1 hr. sessions).
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Future Plans• Additional LSRII in one to two years. We have applied for a Shared Instrument Grant that is pending review.
• Further application development and customer support and training.
• Expansion with a satellite facility in the Amistad Building to support Stem Cell, Vascular Biology and Human Immunology programs: will need a new sorter and an LSRII analyzer. All users could use either facility.
• Expanded education mission.• Ideas for what you want or need?
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Applications Examples-Study of B cell Memory• Identifying memory cells and phenotyping them using BrdU labeling.
• Sorting memory cells for mRNA or subsequent functional analysis.
• Using FACS to confirm the microarray data.
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Definition of a “Memory Cell”
• A cell that has previously responded to antigen and that persists in a resting state for a long period of time after initial exposure.
• What are the features that distinguish resting “memory” and naïve B cells?
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Eswitch
VDJ C M
s
Balb/c IgMa, no secreted exonBl/6, VH186.2
Signals for production of secreted IgM have been deleted.Only membrane-bound IgMa is produced by the transgene.
Pairing of the VH186.2 variable region gene withendogenous 1 light chain produces antibody specific forthe hapten NP.
This provides a system in which the functions of B cellsand antibody can be distinguished.
Membrane IgM (mIgM)Transgene Construct
Ig Transgenic mice with an increased frequency of
hapten NIP-specific B cells
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Expansion of Antigen-specific Population 12
weeks after Immunization
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Summary of NP+ Expansion after Immunization
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BrdU is administered intraperitoneally every 12 hours
on the days indicated above.
BrdU Labeling Strategy
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BrdU-positive Ag-specific B cells present in mIg and (m+s)Ig mice
12 weeks post immunization
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n=5-14 mice
BrdU+NP+ Half life >8wks
Decay Kinetics of BrdU-labeled Memory B cells is Equivalent in mIg and
(m+s)Ig mice
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BrdU-positive, NP+ B cells present in mIg and (m+s)Ig
Immune mice were compared with NP+ cells in Alum control mice
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Resting Memory Cells Have High CD80 Expression
Bold=immune
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A System for Generating Large Numbers of Memory Cells for
Further Study: Hyperimmunization of mIg mice
NP-CGG AssayNP-CGG
d0- 4wk 8 12 20wk16
A.
1.66 7.96
NP+
B22
0+
Naive Two Doses
12 weeks post 2nd immunization
B.
C.
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Naïve or Immunized -NP Splenocytes
FACS Sorting
RNA Isolation
Affymetrix Hybridization
APPROACH
Statistical Analysis
Data Mining
1.68
93.8
Kappa
NIP
3.16
92.4
Naive
Memory
Biological Replicates
Naïve NPMemory NPGC NP
#134
Labeled cRNA Preparation
#2446
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PI
97.3
PE-anti-
AA4.1
35.1
# Cells 50.8
Side
Scatter
FACS Isolation of NP+ Splenic B Cells for Affymetrix and qPCR
Analysis
Fitc-anti-B220 APC-NIP
Naive
Memory
77.9
Bonnie JhD-/- Jk-/- mice
Bonnie JhD-/- mice 12 weeks post 2nd immunization
4oC; NaAzide 0.05%; FCS
17.4
79.3
Biot-anti-KappaAPC-NIP
51.7
Fitc-anti-B220
# Cells97.9
PI
Side
Scatter
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Cell Surface Molecules: M>N
(Affy and qPCR ConfirmedMela (80-kD Melanoma Antigen)
Emp1 (epithelial membrane protein 1)
Bmpr1a (bone morphogenetic protein receptor, type 1A)
Atp11a (ATPase, class VI, type 11A)
Myadm (myeloid-associated differentiation marker)
Adora2a (adenosine A2a receptor)
CD80
CD36
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Acknowledgements
• Tom, Geoff, Gouzel, and Don• HHMI, Internal Medicine, YCCC• YSM Administration• Shannon Anderson and Mary Tomayko
• Today’s speakers