Differential Signalling and Kinetics of Neutrophil Extracellular Trap Release Revealed by Quantitative Live Imaging
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1 Differential Signalling and Kinetics of Neutrophil Extracellular Trap Release Revealed by Quantitative Live Imaging Maarten van der Linden 1, Geertje H.A. Westerlaken 1, Michiel van der Vlist 1, Joris van Montfrans 2 & Linde Meyaard 1 * Video S1. NET release in response to live opsonized S. aureus. Neutrophils from HDs were stimulated with live opsonized S. aureus and monitored over time for 4 hours using Hoechst (magenta) and Sytox Green (green). Live imaging showed the binding of Sytox Green to intracellular DNA (Sytox Green+ neutrophil) and extracellular DNA (NET). Video S2. Visualization is necessary to distinguish NET release from toxin-induced cell death. Neutrophils from HDs were stimulated with viable opsonized S. aureus or toxins from S. aureus and monitored over time for 4 hours using Hoechst (magenta), Sytox Green (green) and transmitted light. Live imaging showed that NET release occurs in multiple steps. When neutrophils are exposed to viable opsonized S. aureus, neutrophils become activated and the nuclear material is spread throughout the neutrophil but remains intracellular. At the moment the plasma membrane breaks, the DNA was released in the extracellular environment. When the neutrophils are exposed to only toxins from S. aureus, the cell death that occurs does resembles the first stage of NET release but does not result in actual release of DNA in the extracellular milieu. Video S3. Toxin-induced cell death vs NET release. Neutrophils from HDs were stimulated with toxins from overnight culture of S. aureus or HK opsonized S. aureus and monitored over time for 4 hours using Hoechst and Sytox Green. Live imaging showed that neutrophils release NETs in response to HK opsonized S. aureus while stimulation with toxins alone resulted in Sytox Green+ neutrophils. Video S4. NET release in response to PMA. Neutrophils from HDs were stimulated with PMA and monitored over time for 4 hours using Hoechst and Sytox Green.
2 Figure S1. Macro Step by step procedure 1. Creating image sequences - Open image sequence via import (image sequence) - Save image sequences as Tiff file 2. Counting neutrophils - Set scale - Set auto Threshold (Moments) - Seperate particles via watershed function - Analyze particles (Size in µm 2 : -infinity; Circularity is -1) 3. Counting Sytox Green+ neutrophils - Set scale and NETs - Set auto Threshold (Li) - Seperate particles via watershed function - Analyze particles * Sytox Green+ neutrophils (Size in µm 2 : 35-68; Circularity is -1) * NETs (Size in µm 2 : 68-infinity; Circularity is -1) Figure S2. Amount per picture min 24 min 68 m >68 Area of Sytox Green particles ( m 2 ) ** Figure S2. NETs cover a surface above 68 µm 2. Neutrophils from healthy donors were stimulated with opsonized S. aureus. On time point 6 min and 24 min after stimulation, Sytox Green surface of all particles per image were determined and the amount of particular Sytox Green particles was defined. Data from 5 independent experiments are presented as median ± interquartile range. Statistical significance (**P <.1) was determined by two-tailed Mann-Whitney test.
3 Figure S3. Amount of neutrophils Figure S3. The amount of neutrophils in the field of view over time. Neutrophils from healthy donors were left unstimulated and the amount of neutrophils in the field of view was determined. The amount of neutrophils remains constant over time. Data from 4 independent experiments are presented as median ± interquartile range. Figure S4. t = t = 18 t = 36 t = 54 t = %NETs (>68 µm 2 ) Donor 1 Donor 2 Donor 3 Figure S4. Sytox Green+ neutrophils do not release NETs after prolonged incubation. Neutrophils from healthy donors were stimulated with opsonized S. aureus and monitored over time for 13 hours. Quantification of Sytox Green+ neutrophils and NETs of 3 independent experiments performed with 3 donors. The data are presented as median ± interquartile range.
4 Figure S5. A BAPTA-AM Celastrol MLN8 SB2219 SB Bay DPI Mitoquinone R46 Rapamycin nm 1 nm 1 nm Bafilomycin A Wortmannin GW574 JNKi II U-732 B MSU Rapamycin No inhibitor AUC (rel. ) Viable opsonized S. aureus PMA
5 C Viable opsonized S. aureus PMA MSU Mitoquinone Bafilomycin A GW574 JNKi U-732 Bay Celastrol AUC (rel. ) AUC (rel. ) No inhibitor AUC (rel. ) Figure S5. Study of underlying signalling of NET release. (A) A pilot study was performed to determine the optimal concentration of the chemical inhibitors. Neutrophils from healthy donors were incubated with different inhibitor concentration and the concentration that did not show any Sytox Green+ neutrophils (dying cells) was selected (indicated in the gray box). AUC of NET quantification of 2 independent experiments are presented as median ± interquartile range. Neutrophil from healthy donors were pretreated with (B) Rapamycin (mtorc1 inhibitor) or (C) Celastrol (NF-κB inhibitor), Bay (IκB phosphorylation inhibitor), GW574 (craf1 kinase inhibitor), U-732 (PLC inhibitor), Bafilomycin A (vacuolar-type H+-ATPase inhibitor), JNKi (JNK inhibitor) and Mytoquinone (mitochondrial ROS inhibitor) before stimulation with MSU, PMA and viable opsonized S. aureus. AUC of NET quantification of 3 independent experiments are presented as median ± interquartile range. Figure S6. No pipetting With pipetting 1 µm 1 µm Viable opsonized S. aureus induced NET release (t = 24 min) Figure S6. Pipetting artifacts. Neutrophils from a healthy donor were stimulated with opsonized S. aureus for 24 min. Merge images (Hoechst in magenta and Sytox Green in green) show the morphology of NETs with and without pipetting after NET release.
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