Trypan Blue Staining and Cell Viability with HlyII Toxin
Author Information
Author(s): Tran Seav-Ly, Puhar Andrea, Ngo-Camus Maud, Ramarao Nalini
Primary Institution: INRA, Unité MICALIS, UMR 1319, Guyancourt, France
Hypothesis
Can the pore-forming toxin HlyII of Bacillus cereus allow trypan blue to enter viable cells?
Conclusion
The study demonstrates that trypan blue can enter viable cells through pores formed by the HlyII toxin, indicating that blue staining does not necessarily mean cell death.
Supporting Evidence
- HlyII at 0.2 µg/mL stained 50% of the cells blue after 2 hours.
- Cells treated with HlyII were still metabolically active for up to 2 hours.
- After washing out the toxin, cells could recover and regenerate their membranes.
Takeaway
This study shows that a dye called trypan blue can get into living cells when a certain toxin makes tiny holes in their membranes, so just seeing the blue color doesn't always mean the cells are dead.
Methodology
Murine J774 macrophages were incubated with various doses of purified HlyII, and trypan blue staining was used to assess membrane permeability.
Limitations
The study primarily focuses on a specific toxin and cell type, which may limit the generalizability of the findings.
Participant Demographics
Murine J774 macrophages were used in the experiments.
Digital Object Identifier (DOI)
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