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Gaucher-like changes in human blood-derived macrophages induced by beta-glucocerebrosidase inhibition
S Yatziv1, D S Newburg, N Livni
1Department of Pediatrics, Hadassah University Hospital Medical School, Jerusalem.
Abstract:
Human blood-derived macrophages were cultured in the presence of conduritol-B-epoxide, a specific inhibitor of beta-glucosidase, to induce changes resembling those occurring in the cells of patients with Gaucher's disease. After 24 hours of incubation, only 5% of the original beta-glucosidase activity remained; on removal of the inhibitor, the enzyme activity recovered almost fully to control levels after 5 days. After 30 days of incubation with conduritol-B-epoxide, the macrophages contained almost 10 times as much glucocerebroside as the untreated controls, and the cells displayed morphologic changes reminiscent of Gaucher's cells. This in vitro system may enable detailed studies on the pathogenetic mechanisms associated with glucocerebroside accumulation in human macrophages as well as on the turnover of the accumulated substrate and reversal of the morphologic abnormalities on removal of the inhibitor.
Insights
This study created Gaucher-like disease cells in vitro using conduritol-B-epoxide to inhibit beta-glucosidase. Macrophages accumulated glucocerebroside and showed cell changes, which reversed upon inhibitor removal, offering a model for Gaucher
Area of Science:
- Biochemistry
- Cell Biology
- Pathogenesis
Background:
- Gaucher's disease is a lysosomal storage disorder.
- It is characterized by the accumulation of glucocerebroside in macrophages.
- Beta-glucosidase deficiency is the underlying cause.
Purpose of the Study:
- To establish an in vitro model of Gaucher's disease using human macrophages.
- To investigate the effects of beta-glucosidase inhibition on macrophage function and morphology.
- To explore substrate accumulation and reversal of cellular changes.
Main Methods:
- Human blood-derived macrophages were cultured with conduritol-B-epoxide, a beta-glucosidase inhibitor.
- Enzyme activity, glucocerebroside levels, and cell morphology were assessed.
- Inhibitor removal was used to study reversibility.
Main Results:
- Conduritol-B-epoxide significantly reduced beta-glucosidase activity in macrophages.
- Macrophages accumulated nearly 10 times more glucocerebroside compared to controls after 30 days.
- Cellular morphology changed to resemble Gaucher cells, and these changes reversed upon inhibitor removal.
Conclusions:
- This in vitro system effectively mimics key aspects of Gaucher's disease in human macrophages.
- The model allows for detailed study of glucocerebroside accumulation mechanisms.
- It provides a platform to investigate therapeutic strategies for reversing Gaucher cell abnormalities.