Related Experiment Videos
Neurotoxicity of cholesterol oxides on cultured cerebellar granule cells
1Department of Anatomy, University of Arkansas for Medical Sciences, Little Rock 72205, USA.
Abstract:
Cultured rat cerebellar granule cells were used to determine the potential neurotoxicity of cholesterol oxides. The cholesterol oxides tested included: 7-beta-OH-, 7-keto-, 19-OH-, 22(R)-OH-, 22(S)-OH- and 25-OH- cholesterol. Among them, 7-beta-OH- and 7-keto-cholesterol were the most efficacious in causing neuronal death such that 20 microg/ml (50 microM) of these agents killed more than 80% of cells in 2 days. 7-beta-OH-cholesterol at this concentration killed 50% of cells in approximately 7 h. A number of pharmacological agents were tested for their abilities to prevent neuronal death induced by cholesterol oxides. Among them, aurintricarboxylic acid, vitamin E and methyl-beta-cyclodextrin were able to prevent cholesterol oxide-induced neurotoxicity in a dose-dependent manner. These results suggest that, in addition to causing pathological changes in cells directly involved in atherosclerosis, cholesterol oxides may induce toxicity in neurons of the central nervous system.
Insights
Cholesterol oxides, particularly 7-beta-OH- and 7-keto-cholesterol, demonstrate significant neurotoxicity in rat neurons. Certain agents like vitamin E can protect against this cholesterol oxide-induced neurotoxicity.
Area of Science:
- Neuroscience
- Biochemistry
- Toxicology
Background:
- Cholesterol oxides are implicated in atherosclerosis.
- Their potential neurotoxic effects are not fully understood.
Purpose of the Study:
- To investigate the neurotoxicity of various cholesterol oxides on cultured rat cerebellar granule cells.
- To identify potential protective agents against cholesterol oxide-induced neuronal death.
Main Methods:
- Primary neuronal cultures (rat cerebellar granule cells) were exposed to different cholesterol oxides.
- Cell viability was assessed after exposure.
- The efficacy of pharmacological agents in preventing neurotoxicity was evaluated.
Main Results:
- 7-beta-OH-cholesterol and 7-keto-cholesterol were potent neurotoxins, causing >80% cell death at 20 microg/ml within 2 days.
- 7-beta-OH-cholesterol induced 50% cell death in approximately 7 hours at this concentration.
- Aurintricarboxylic acid, vitamin E, and methyl-beta-cyclodextrin offered dose-dependent protection against neurotoxicity.
Conclusions:
- Cholesterol oxides exhibit significant neurotoxicity, impacting central nervous system neurons.
- This neurotoxicity may contribute to neurological disorders beyond cardiovascular pathologies.
- Pharmacological interventions show promise in mitigating cholesterol oxide-induced neuronal damage.