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Bismuth-induced lysosomal rupture in J774 cells
M Stoltenberg1, A Larsen, M Zhao
1Department of Neurobiology, Institute of Anatomy, University of Aarhus, Denmark. ms@neuro.au.dk
Summary
Bismuth drugs combat Helicobacter pylori ulcers by accumulating in macrophage lysosomes. This accumulation causes lysosomal rupture and subsequent programmed cell death (apoptosis), explaining bismuth
Area of Science:
- Cell biology
- Histochemistry
- Pharmacology
Background:
- Bismuth-containing drugs are utilized for treating Helicobacter pylori-associated peptic ulcers.
- Bismuth presence has been observed in macrophages within peptic ulcer tissues.
Purpose of the Study:
- To investigate the cellular mechanisms of bismuth accumulation and its effects on macrophages.
- To elucidate the role of bismuth in the context of peptic ulcer treatment.
Main Methods:
- Application of the autometallographic technique for histochemical bismuth detection.
- Exposure of J774 macrophage cells to bismuth citrate.
- Assay of lysosomal integrity using acridine orange uptake and flow cytofluorometry.
Main Results:
- Bismuth citrate exposure led to bismuth accumulation within the lysosomes of J774 cells.
- Observed lysosomal rupture in bismuth-exposed cells.
- Confirmed ensuing apoptotic cell death following lysosomal damage.
Conclusions:
- Bismuth accumulation in macrophage lysosomes triggers lysosomal rupture and apoptosis.
- This mechanism contributes to the therapeutic effects of bismuth in treating peptic ulcers.