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Impaired electroretinogram (ERG) response in apolipoprotein E-deficient mice.
John M Ong1, Nadia C Zorapapel, Annette M Aoki
1Molecular Eye Research Laboratory, Burns and Allen Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA. ongj@cshs.org
Current Eye Research
|July 18, 2003
Summary
High cholesterol diets impair retinal function in apolipoprotein E (apoE)-deficient mice, causing reduced electroretinography (ERG) responses and increased cell death markers. This highlights cholesterol metabolism
Area of Science:
- Ophthalmology
- Cardiovascular Biology
- Molecular Biology
Background:
- Apolipoprotein E (apoE) plays a crucial role in lipid metabolism.
- Dysregulation of cholesterol metabolism is implicated in various diseases.
- The impact of hypercholesterolemia on retinal function requires further investigation.
Purpose of the Study:
- To investigate the effects of a 35-week cholesterol-rich diet on the electroretinography (ERG) response in apolipoprotein E (apoE)-deficient mice.
- To analyze retinal tissue for molecular changes associated with cell death.
Main Methods:
- Mice models: C57BL/6J and apoE-deficient mice fed standard or cholesterol-rich diets.
- Functional assessment: Dark-adapted electroretinography (ERG) to measure retinal electrical activity.
- Molecular analysis: Immunohistochemistry and gene expression profiling (nucleic acid array) of retinal tissue.
Main Results:
- ApoE-deficient mice on a cholesterol diet (ApoE-C) exhibited significantly diminished a- and b-wave amplitudes in ERG responses compared to controls.
- Gene expression analysis revealed upregulation of pro-apoptotic genes in ApoE-C mice.
- Immunohistochemistry confirmed increased Bax protein expression, a marker of apoptosis.
Conclusions:
- Hypercholesterolemia in apoE-deficient mice leads to a measurable loss of retinal function (ERG response).
- Cholesterol-rich diets induce apoptotic activity in the retina at both gene and protein levels.
- These findings underscore the critical role of cholesterol metabolism in maintaining normal retinal function.