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Updated: May 10, 2026
Microglia as a Surrogate Biosensor to Determine Nanoparticle Neurotoxicity
Published on: October 25, 2016
Cholesterol load of microglia: contribution of membrane architecture changes to neurotoxic power?
1Institute of Experimental Pharmacology & Toxicology Slovak Academy of Sciences, Bratislava, Slovak Republic. lucia_rackova@hotmail.com
Abstract:
Considerable evidence provides a link between hypercholesterolemia and ageing-related neurodegenerative diseases. The present study was aimed to provide a complex view on the effects caused by cholesterol- and cholesterol 5α,6α-epoxide-load in microglia, with particular emphasize put on membrane proteins. Prolonged application of oxysterol significantly enhanced LPS-stimulated association of cytosolic NADPH-oxidase factor p47[phox] with detergent-resistant microdomains (DRMs) in BV-2 cells. Although the treatment with both sterols does not influence the portion of CD36 receptor in DRMs, its apparent surface-cellular expression was altered. Even though sterol-treatment potentiated oxidant production by microglia, as well as their phagocytosis, these effects, however, appeared to be independent of cholesterol profusion in the membrane. In addition, oxysterol-treatment resulted in a loss of DRMs-associated activity of 26S proteasome, the protease critically regulating both protein homeostasis and immune signaling in microglia. Oxysterol relatively ameliorated cytotoxic effects of inflammed microglia on co-cultured PC12 cells. The outcomes of this study suggest that cholesterol and cholesterol oxides can differentially modulate microglia resulting either in impairment of their immune functionalities or enhanced neurotoxic power. Moreover, these findings shed light on possible complexity of this effect, produced by simultaneous affection of the levels, distribution and function of the critical proteins within microglial membrane compartments.
Insights
High cholesterol and its oxides impact microglia, potentially impairing immune function or increasing neurotoxicity. This study examines their complex effects on microglial membrane proteins and cellular activities.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Hypercholesterolemia is linked to neurodegenerative diseases.
- Microglia play crucial roles in brain immunity and homeostasis.
- Cholesterol and its oxides are implicated in cellular dysfunction.
Purpose of the Study:
- To investigate the complex effects of cholesterol and cholesterol 5α,6α-epoxide on microglia.
- To focus on alterations in microglial membrane proteins and cellular functions.
- To understand the differential modulation of microglia by sterols.
Main Methods:
- Utilized BV-2 microglial cell line.
- Applied prolonged oxysterol and cholesterol treatments.
- Analyzed p47[phox] association with detergent-resistant microdomains (DRMs).
- Assessed CD36 receptor expression and distribution.
- Measured oxidant production and phagocytosis.
- Evaluated 26S proteasome activity in DRMs.
- Examined cytotoxic effects on PC12 cells.
Main Results:
- Oxysterol enhanced LPS-stimulated p47[phox] association with DRMs.
- Sterol treatment altered CD36 surface expression but not its DRM portion.
- Sterol-induced potentiation of oxidant production and phagocytosis was independent of membrane cholesterol levels.
- Oxysterol treatment reduced DRM-associated 26S proteasome activity.
- Oxysterol ameliorated microglial cytotoxicity towards PC12 cells.
Conclusions:
- Cholesterol and its oxides differentially modulate microglia, affecting immune function and neurotoxicity.
- These sterols impact microglial membrane protein levels, distribution, and function.
- Findings highlight the complex role of sterols in neuroinflammation and neurodegeneration.
