Flow Cytometry Assay to Quantify Oxidative Stress: An Assay to Quantify Reactive Oxygen Species in Intestinal Organoids Using Fluorogenic Probes
Published: April 30, 2023
Abstract
Source: Stedman, A., et al., Analyzing Oxidative Stress in Murine Intestinal Organoids using Reactive Oxygen Species-Sensitive Fluorogenic Probe. J. Vis. Exp. (2021).
This video demonstrates a flow cytometry assay to quantify the ROS levels in 3D intestinal organoids obtained from GFP-expressing transgenic mice. This method provides an in vitro experimental model to investigate the efficacy of test compounds on ROS production.
Protocol
All procedures involving animal models have been reviewed by the local institutional animal care committee and the JoVE veterinary review board. 1. Preparation of reagents and materials for culturing intestinal organoids To prepare growth culture medium, mix advanced DMEM/F-12 supplemented with 1x glutamine, 1x penicillin/streptomycin (P/S) solution, 10 mM of HEPES, 50 ng/mL of murine EGF, 20 µg/mL of murine Noggin 500 ng/mL of mouse R-Spondin1 (see Table of Mater…
Representative Results
Figure 1: Representative images of crypts and organoids. (A) Example of fraction F1 obtained after the first incubation with EDTA, enriched in villi (square), with some debris (star) and crypts (circle). (B) Example of fraction F4 enriched in crypts. (C) Suspension presenting only isolated crypts obtained after the filtration …
Divulgations
The authors have nothing to disclose.
Materials
| Mice | |||
| Lgr5-EGFP-IRES-creERT2 (Lgr5-GFP) | The Jackson Laboratory | ||
| Growth culture medium | |||
| Advanced DMEM F12 (DMEM/F12) | ThermoFisher | 12634010 | |
| B-27 Supplement, minus vitamin A | ThermoFisher | 12587010 | Stock Concentration: 50x |
| GlutaMAX (glutamine) | ThermoFisher | 35050038 | Stock Concentration: 100x |
| Hepes | ThermoFisher | 15630056 | Stock Concentration: 1 M |
| Murine EGF | R&D | 2028-EG-200 | Stock Concentration: 500 µg/mL in PBS |
| murine Noggin | R&D | 1967-NG/CF | Stock Concentration: 100 µg/mL in PBS |
| Murine R-spondin1 | R&D | 3474-RS-050 | Stock Concentration: 50 µg/mL in PBS |
| N-2 Supplement | ThermoFisher | 17502048 | Stock Concentration: 100x |
| Penicillin-Streptomycin (P/S) | ThermoFisher | 15140122 | Stock Concentration: 100x (10,000 units/mL of penicillin and 10,000 µg/mL of streptomycin) |
| Material | |||
| 70 µm cell strainer | Corning | 352350 | |
| 96-well round bottom | Corning | 3799 | |
| ball tip scissor | Fine Science Tools GMBH | 14086-09 | |
| CellROX® Deep Red Reagent | ThermoFisher | C10422 | |
| DAPI (4’,6-diamidino-2-phénylindole, dichlorhydrate) (fluorgenic probe) | ThermoFisher | D1306 | stock at 10 mg/mL |
| DPBS 1x no calcium no magnesium (DPBS) | ThermoFisher | 14190144 | |
| Matrigel Growth Factor Reduced, Phenol Red Free (Basement Membrane Matrix) | Corning | 356231 | once received thaw o/n in the fridge, keep for 1h on ice and, make 500 mL aliquots and store at -20 °C |
| N-acetylcysteine (NAC) | Sigma | A9165 | |
| tert-Butyl hydroperoxide (tBCHP)solution (70%wt. In H2O2) | Sigma | 458139 | |
| TrypLE Express Enzyme (1X), no phenol red (trypsin) | ThermoFisher | 12604013 | |
| UltraPure 0.5 M EDTA, pH8.0 | ThermoFisher | 15575020 | |
| Y-27632 | Sigma | Y0503 | Rock-inhibitor to be used to minimize cell death upon tissue dissociation |
| Programs and Equipment | |||
| Attune NxT (Flow Cytometer) | ThermoFischer | Flow cytometer analyzer | |
| FlowJo | BD Bioscience | FACS analysis | |
| Prism | GraphPad Software | statistical analysis |
Tags
Citer Cet Article
Flow Cytometry Assay to Quantify Oxidative Stress: An Assay to Quantify Reactive Oxygen Species in Intestinal Organoids Using Fluorogenic Probes. J. Vis. Exp. (Pending Publication), e21221, doi: (2023).