Quantitative Time-Lapse Microscopy for Assessing Extracellular Matrix Stiffness-Dependent Bacterial Dissemination
Published: March 29, 2024
Abstract
Source: Bastounis, E. E. et al., A Multi-well Format Polyacrylamide-based Assay for Studying the Effect of Extracellular Matrix Stiffness on the Bacterial Infection of Adherent Cells. J. Vis. Exp. (2018)
This video showcases quantitative time-lapse microscopy for evaluating extracellular matrix stiffness-dependent Listeria monocytogenes dissemination through endothelial cells. A softer hydrogel facilitates faster bacterial dissemination through endothelial cells compared to stiffer counterparts, highlighting the influence of matrix stiffness on bacterial dissemination.
Protocol
1. Manufacturing Thin Two-layered Polyacrylamide (PA) Hydrogels on Multi-Well Plates Dissolve ammonium persulfate (APS) in distilled ultrapure water to achieve a final concentration of 10 g/mL. Aliquot and store the solution at 4 °C for short-term use (3 weeks). NOTE: The above solution can be prepared in advance of hydrogel fabrication. Glass activation of 24-well dishes Incubate 24-well glass bottom plates with…
Representative Results
Figure 1: Bacterial infection assay of host cells residing on thin two-layered fluorescent bead-embedded polyacrylamide (PA) hydrogels of varying stiffness. A. Glass coverslips are chemically modified to enable hydrogel attachment. B. 3.6 µL of PA mixtures are deposited on the glass bottoms. C. The mixture is covered with a 12-mm circular glas…
Disclosures
The authors have nothing to disclose.
Materials
| Reagents | |||
| Sodium hydroxide pellets | Fisher | S318-500 | |
| (3-Aminopropyl)triethoxysilane | Sigma | A3648 | |
| 25% gluteraldehyde | Sigma | G6257-100ML | |
| 40% Acrylamide | Sigma | A4058-100ML | |
| Bis-acrylamide solution (2%w/v) | Fisher Scientific | BP1404-250 | |
| Ammonium Persulfate | Fisher | BP17925 | |
| TEMED | Sigma | T9281-25ML | |
| Sulfo-SANPAH | Proteochem | c1111-100mg | |
| Collagen, Type I Solution from rat | Sigma | C3867-1VL | |
| Dimethyl sulfoxide (DMSO) | J.T. Baker | 9224-01 | |
| HEPES, Free acid | J.T. Baker | 4018-04 | |
| Leibovitz's L-15 medium, no phenol red | Thermofischer | 21083027 | |
| MCDB 131 Medium, no glutamine | Life technologies | 10372019 | |
| Foundation Fetal Bovine Serum, Lot: A37C48A | Gemini Bio-Prod | 900108 500ml | |
| Epidermal Growth Factor, EGF | Sigma | E9644 | |
| Hydrocortisone | Sigma | H0888 | |
| L-Glutamine 200mM | Fisher | SH3003401 | |
| DPBS 1X | Fisher | SH30028FS | |
| Gentamicin sulfate | MP biomedicals | 194530 | |
| Chloramphenicol | Sigma | C0378-5G | |
| DifcoTM Agar, Granulated | BD | 214530 | |
| BBL TM Brain-heart infusion | BD | 211059 | |
| Hoechst 33342, trihydrochloride, trihydrate – 10 mg/ul solution in water | Invitrogen | H3570 | |
| 0.25% trypsin-EDTA , phenol red | Thermofischer | 25200056 | |
| Streptomycin sulfate | Fisher Scientific | 3810-74-0 | |
| Disposable lab equipment | |||
| 12 mm circular glass coverslips | Fisherbrand | 12-545-81 | No. 1.5 Coverslip | 10 mm Glass Diameter | Uncoated |
| Glass bottom 24 well plates | Mattek | P24G-1.5-13-F | |
| T-25 flasks | Falcon | 353118 | |
| 50 ml conical tubes | Falcon | 352070 | |
| 15 ml conicals tubes | Falcon | 352196 | |
| Disposable Serological Pipettes (1 ml, 2 ml, 5 ml, 10 ml, 25 ml) | Falcon | 357551 | |
| Pasteur Glass Pipettes | VWR | 14672-380 | |
| Pipette Tips (1-200 μl, 101-1000 μl) | Denville | P1122, P1126 | |
| Powder Free Examination Gloves | Microflex | XC-310 | |
| Cuvettes bacteria | Sarstedt | 67.746 | |
| Razors | VWR | 55411-050 | |
| Syringe needle | BD | 305167 | |
| 0.2um sterilizng bottles | Thermo Scientific | 566-0020 | |
| 20 ml syringes | BD | 302830 | |
| 0.2um filters | Thermo Scientific | 723-2520 | |
| wooden sticks | Grainger | 42181501 | |
| Saran wrap | Santa Cruz Biotechnologies | sc-3687 | |
| Plates bacteria | Falcon | 351029 | |
| Large/non-disposable lab equipment | |||
| Tissue Culture Hood | Baker | SG504 | |
| Hemacytometer | Sigma | Z359629 | |
| Bacteria incubator | Thermo Scientific | IGS180 | |
| Tissue culture Incubator | NuAire | NU-8700 | |
| Vacuum chamber/degasser | Belart | 42025 | 37 °C and 5% CO2 |
| Inverted Nikon Diaphot 200 epifluorescence microscope | Nikon | NIKON-DIAPHOT-200 | |
| Cage Incubator | Haison | Custom | |
| Pipette Aid | Drummond | 4-000-110 | |
| Pipettors (10 μl, 200 μl, 1000ul) | Gilson | F144802, F123601, F123602 | |
| pH meter | Mettler Toledo | 30019028 | |
| forceps | FST | 11000-12 | |
| 1 L flask | Fisherbrand | FB5011000 | |
| Autoclave machine | Amsco | 3021 | |
| Stir magnet plate | Bellco | 7760-06000 | |
| Magnet stirring bars | Bellco | 1975-00100 | |
| Spectrophotometer | Beckman | DU 640 | |
| Software | |||
| Microscope Software (μManager) | Open Imaging | ||
| Matlab | Matlab Inc | ||
| Flowjo | FlowJo, LLC | ||
| Automated image analysis software, CellC | https://sites.google.com/site/cellcsoftware/ | The software is freely available. Eexecutable files and MATLAB source codes can be obtained at https://sites.google.com/site/cellcsoftware/ |
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Cite This Article
Quantitative Time-Lapse Microscopy for Assessing Extracellular Matrix Stiffness-Dependent Bacterial Dissemination. J. Vis. Exp. (Pending Publication), e22006, doi: (2024).