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Evaluating the Effects of Cell Sorting on Gene Expression
ABRF 2015 St. Louis MO
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FCRG Members Co-Chairs: Monica DeLay Cincinnati Children’s Hospital
Peter Lopez NYU Medical Center Members: Alan Bergeron Dartmouth School of Medicine Andrew Box Stowers Institute for Medical Research Kathleen Brundage West Virginia University Sridar Chittur SUNY Albany Matthew Cochran University of Rochester Mike Meyer University of Pittsburgh Alan Saluk Scripps Research Institute Scott Tighe Vermont Cancer Center EB Liaison: Frances Weis-Garcia Memorial Sloan Kettering
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Affymetrix/eBioscience efluor660-CD19 antibody
Acknowledgements Affymetrix/eBioscience efluor660-CD19 antibody Mouse Gene ST 2.0 microarrays Qiagen RNeasy Micro columns NuGEN Ovation Pico WTA reagents Marcy Kuentzel, SUNY Albany
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Overall Goal: To develop best practices for sorting cells with minimal
Overall Goal: To develop best practices for sorting cells with minimal changes to the sorted cell population(s) Current Study: Evaluate gene expression changes in C57Bl/6 mouse B cells after sorting
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Background Last Year’s study: Cell type: Jurkat cells
Analysis: Cell Cycle Analysis Gene expression – Affymetrix GeneChip Prime View arrays Results: Transient Changes in gene expression after sorting Unsorted = no pressure and no sorting Pressure = pressurized on the sorter but not actually sorted Sorted = sorted on the MoFlo Legacy (50 micron nozzle/60psi)
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Sorting Conditions: High pressure and Low pressure
Study: Primary cells Sorting Conditions: High pressure and Low pressure Instrument Designs: Jet-in-Air and Cuvette Hybrid Jet-in-Air Cuvette Hybrid Flow Cell Flow Cell Interrogation point Nozzle Nozzle Interrogation point
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Study Cell Source: Splenocytes from 2-6 month old male C57Bl/6 mice Sorted Population: CD19(+) B cells Sorters: BD FACSAria (4) – Cuvette hybrid BC MoFlo Astrios (2) – Jet-in-Air BD Influx (1) – Jet-in-Air Nozzle/Pressure: 70 micron/ psi (High pressure) 100 micron/20 – 25 psi (Low pressure)
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Study Design RNA Isolation using Qiagen RNeasy Micro kit Spleen
Time: 0 Time: 4h FLOW SORTING Y Time: 8h NuGEN Ovation Pico WTA v2 Staining with Anti-CD19 Affymetrix Mouse Gene ST 2.0 Microarray
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Samples were Analyzed on Affymetrix Mouse Gene 2.0 ST Microarray
Study Samples Total RNA was isolated from all samples (in duplicate), checked for quality and stored at -80oC FACSAria Influx MoFlo Astrios Low Pressure 100micron/25 psi 100micron/20 psi High Pressure 70 micron/60 psi 70 micron/70 psi Cuvette Hybrid Jet-in-Air For each instrument & pressure there were three time points: 0 h post sort 4 h post sort 8 h post sort Samples were Analyzed on Affymetrix Mouse Gene 2.0 ST Microarray
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Analysis Criteria The probes that showed signals within the bottom 20th percentile across all samples were filtered out. The list was further filtered to remove any entities that had >25% CV A 2-way ANOVA was run to select entities that showed differential expression EITHER (a) between 4h or 8h as compared to the 0h time point within each instrument and at both pressures OR (b) between the different pressures at 0h time points within each instrument 4. A 2-fold cutoff was applied to each comparison 5. Lists of differentially expressed entities were generated for the following comparisons: 0h low vs 0h high (within each instrument) 4h vs 0h (within each instrument at a given pressure) 8h vs 0h (within each instrument at a given pressure)
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Analysis Criteria (continued)
To compare the lists between low and high pressures (at 4h or 8h), a difference of difference list was generated for each instrument. For Example: Instrument: FACSAria Gene: KLF4 High Pressure Low Pressure 4h vs 0h = h vs 0h = -5.9 8h vs 0h = h vs 0h = -8.2 then, at 4h high vs 4h low pressure (-10.8) – (-5.9) = (down in high pressure samples) at 8h high vs 8h low pressure (-13.7) – (-8.2) = (down in high pressure samples)
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Chip Results The number of genes whose expression are altered in samples sorted under normal conditions for lymphocytes (small nozzle size/high pressure) compared to low stress conditions (large nozzle/low pressure) for each instrument and time point Gene response 4 hour 8 hour FACSAria Influx MoFlo Astrios Up 7 26 2 3 Down 17 12 9 18 Cuvette Hybrid Jet-in-Air Cuvette Hybrid Jet-in-Air
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Genes Up at 4h 1 gene up in 2 instrument
Row Labels Aria Influx MoFlo Grand Total B05Rik 1 J03Rik AF067061 Ahr Ccl22 Ccl3 Clec12a Dusp10 Fam100a Fam46c Gdap10 Gla Gm129 2 Gm17434 Gm19450 Gm20022 Gm2423 Ifit1 Il1r2 Il2ra Lamp3 Mir103-2 Oas1b Pde3b Per1 Pik3r4 Plaur Pld4 Ppp1r15a Rgs1 Snora28 Snord19 Trim34b|Trim34a Zc3h12c 7 26 35 Genes Up at 4h 1 gene up in 2 instrument
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Genes Up at 8h No genes up in more than 1 instrument
Row Labels Aria INFLUX MoFlo Total AF067061 1 Ccl22 Egr1 Fam46c Fosb Gm12474 Gm19489 Ifit1 Il2ra LOC Mir103-2 Mir155|LOC Nr4a1 Rgs1 Slamf1 St3gal6 Trim34b|Trim34a 7 3 17 No genes up in more than 1 instrument
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Genes Down at 4h One gene down in all instruments
Row Labels Aria Influx MoFlo Grand Total O15Rik 1 G14Rik Abcg1 2 Ahnak Anxa6 Crisp3 Dusp1 Dusp10 Dusp18 Egr1 Egr3 Emp3 Fam55b Fos Fosb Gm129 Hes1 Hmox1 Klf2 Klf4 3 Mir27a Mthfd2 Plaur Plk2 Rasd1 Rgs1 Rpp38 S1pr3 Slamf1 Trib1 Vim|LOC Zfp385a 17 12 9 38 Genes Down at 4h One gene down in all instruments Four genes down in 2 instruments
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3 genes down in 2 instruments
Row Labels Aria Influx MoFlo Grand Total Jun 1 O15Rik C07Rik G14Rik Atf3 Ccdc99 Cxcr4 Dusp10 Fos Fyn Gm6377|Sh3bgrl Id3 Klf2 Klf4 2 Maf Mir27a Morf4l1|Gm6747 Mxi1 Nr4a2 Nr4a3 Pcp4 Phxr1 Plaur Plk2 Rasd1 S100a6 S1pr3 Sik1 Sipa1l2 Vps37b Zfp414 Zfp948 Zscan21 18 16 36 Genes Down at 8h 3 genes down in 2 instruments (Aria & Influx)
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circadian associated repressor of transcription in mice
Are there genes that are UP in high pressure samples vs low pressure samples in more than one instrument at 4h and/or 8h? 1. No genes were up in all three instruments at 4h or 8h 2. One gene up in two instruments (MoFlo & Influx) BUT only at 4h Gm129 circadian associated repressor of transcription in mice
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One gene down in all instruments
Are there any genes that are DOWN in high pressure samples vs low pressure samples in more than one instrument at 4h and/or 8h? One gene down in all instruments KLF4 1. Decreased in samples from all 3 instruments at 4h and 2 instruments (Aria & Influx) at 8h 2. Known to have a role in B cell proliferation 3. Effects cyclin D and the entry of cells into S stage of the cell cycle One gene down in 2 instruments at both 4h and 8h S1pr3 1. Decreased in samples from all 2 instruments (Aria & Influx) at 4h & 8h 2. G coupled receptor for sphingosine-1-phosphate 3. Shown to be a chemoattractant and director of B cell trafficking
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Conclusions 1. Under the conditions tested (70 psi vs 20 psi) few gene expression changes were observed. 2. Although slight differences were observed, most gene expression alteration subsided during culture. 3. These data agree with past FCRG study with Jurkat cells in which changes in gene expression “go away” after 8h in culture 4. Cell viability was decreased after culturing for 4 and 8h (data not shown) 5. Data indicates [n=1] that the MoFlo Astrios has less influence on gene expression.
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Future Directions 1. Confirm gene expression changes by qPCR 2. Investigate further how the different instruments affect sorted cell populations 3. Write up and publish the results of this study and last year’s study
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Acknowledgements Personnel: Marcy Kuentzel SUNY Albany Reagents:
Affymetrix/eBioscience efluor660-CD19 antibody Mouse Gene ST 2.0 microarrays WT plus reagents Qiagen RNeasy Micro columns NuGEN Ovation Pico WTA reagents
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Viability # * * * * * p<0.05 compared to Time 0
# p<0.05 comparison Low to High
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