PUBLICATION
Chronic vitamin E deficiency impairs cognitive function in adult zebrafish via dysregulation of brain lipids and energy metabolism
- Authors
- McDougall, M., Choi, J., Magnusson, K., Truong, L., Tanguay, R., Traber, M.G.
- ID
- ZDB-PUB-170810-9
- Date
- 2017
- Source
- Free radical biology & medicine 112: 308-317 (Journal)
- Registered Authors
- Tanguay, Robyn L.
- Keywords
- choline, dementia, docosahexaenoic acid, ketones, lysophospholipids, phospholipids, α-tocopherol
- MeSH Terms
-
- Animals
- Avoidance Learning
- Brain/metabolism
- Brain/physiopathology
- Choline/metabolism
- Chronic Disease
- Cognition/physiology
- Cognitive Dysfunction/metabolism*
- Cognitive Dysfunction/physiopathology
- Docosahexaenoic Acids/metabolism
- Energy Metabolism/physiology*
- Fish Diseases/metabolism*
- Fish Diseases/physiopathology
- Glucose/metabolism
- Habituation, Psychophysiologic
- Ketones/metabolism
- Lipid Peroxidation
- Lysophospholipids/metabolism
- Phosphatidylcholines/metabolism
- Phospholipids/metabolism
- Physical Conditioning, Animal
- Vitamin E/metabolism*
- Vitamin E Deficiency/metabolism*
- Vitamin E Deficiency/physiopathology
- Vitamin E Deficiency/veterinary*
- Zebrafish
- PubMed
- 28790013 Full text @ Free Radic. Biol. Med.
Citation
McDougall, M., Choi, J., Magnusson, K., Truong, L., Tanguay, R., Traber, M.G. (2017) Chronic vitamin E deficiency impairs cognitive function in adult zebrafish via dysregulation of brain lipids and energy metabolism. Free radical biology & medicine. 112:308-317.
Abstract
Zebrafish (Danio rerio) are a recognized model for studying the pathogenesis of cognitive deficits and the mechanisms underlying behavioral impairments, including the consequences of increased oxidative stress within the brain. The lipophilic antioxidant vitamin E (α-tocopherol; VitE) has an established role in neurological health and cognitive function, but the biological rationale for this action remains unknown. In the present study, we investigated behavioral perturbations due to chronic VitE deficiency in adult zebrafish fed from 45 days to 18-months of age diets that were either VitE-deficient (E-) or sufficient (E+). We hypothesized that E- zebrafish would display cognitive impairments associated with elevated lipid peroxidation and metabolic disruptions in the brain. Quantified VitE levels at 18-months in E- brains (5.7 ± 0.1 nmol/g tissue) were ~22-times lower than in E+ (122.8 ± 1.1; n= 10/group). Using assays of both associative (avoidance conditioning) and non-associative (habituation) learning, we found E- vs E+ fish were learning impaired. These functional deficits occurred concomitantly with the following observations in adult E- brains: decreased concentrations of and increased peroxidation of polyunsaturated fatty acids (especially docosahexaenoic acid, DHA), altered brain phospholipid and lysophospholipid composition, as well as perturbed energy (glucose/ketone), phosphatidylcholine and choline/methyl-donor metabolism. Collectively, these data suggest that chronic VitE deficiency leads to neurological dysfunction through multiple mechanisms that become dysregulated secondary to VitE deficiency. Apparently, the E- animals alter their metabolism to compensate for the VitE deficiency, but these compensatory mechanisms are insufficient to maintain cognitive function.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping