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| Home > Publications Database > Long-Term Caloric Restriction Attenuates β-Amyloid Neuropathology and Is Accompanied by Autophagy in APPswe/PS1delta9 Mice. |
| Home > Publications Database > Long-Term Caloric Restriction Attenuates β-Amyloid Neuropathology and Is Accompanied by Autophagy in APPswe/PS1delta9 Mice. |
| Journal Article | DZNE-2021-01140 |
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2021
MDPI
Basel
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Please use a persistent id in citations: doi:10.3390/nu13030985
Abstract: Caloric restriction (CR) slows the aging process, extends lifespan, and exerts neuroprotective effects. It is widely accepted that CR attenuates β-amyloid (Aβ) neuropathology in models of Alzheimer's disease (AD) by so-far unknown mechanisms. One promising process induced by CR is autophagy, which is known to degrade aggregated proteins such as amyloids. In addition, autophagy positively regulates glucose uptake and may improve cerebral hypometabolism-a hallmark of AD-and, consequently, neural activity. To evaluate this hypothesis, APPswe/PS1delta9 (tg) mice and their littermates (wild-type, wt) underwent CR for either 16 or 68 weeks. Whereas short-term CR for 16 weeks revealed no noteworthy changes of AD phenotype in tg mice, long-term CR for 68 weeks showed beneficial effects. Thus, cerebral glucose metabolism and neuronal integrity were markedly increased upon 68 weeks CR in tg mice, indicated by an elevated hippocampal fluorodeoxyglucose [18F] ([18F]FDG) uptake and increased N-acetylaspartate-to-creatine ratio using positron emission tomography/computer tomography (PET/CT) imaging and magnet resonance spectroscopy (MRS). Improved neuronal activity and integrity resulted in a better cognitive performance within the Morris Water Maze. Moreover, CR for 68 weeks caused a significant increase of LC3BII and p62 protein expression, showing enhanced autophagy. Additionally, a significant decrease of Aβ plaques in tg mice in the hippocampus was observed, accompanied by reduced microgliosis as indicated by significantly decreased numbers of iba1-positive cells. In summary, long-term CR revealed an overall neuroprotective effect in tg mice. Further, this study shows, for the first time, that CR-induced autophagy in tg mice accompanies the observed attenuation of Aβ pathology.
Keyword(s): Alzheimer Disease: diet therapy (MeSH) ; Alzheimer Disease: pathology (MeSH) ; Amyloid beta-Peptides: metabolism (MeSH) ; Animal Nutritional Physiological Phenomena (MeSH) ; Animals (MeSH) ; Aspartic Acid: analogs & derivatives (MeSH) ; Aspartic Acid: metabolism (MeSH) ; Autophagy: physiology (MeSH) ; Calcium-Binding Proteins: metabolism (MeSH) ; Caloric Restriction: methods (MeSH) ; Cerebral Cortex: metabolism (MeSH) ; Creatine: metabolism (MeSH) ; Disease Models, Animal (MeSH) ; Fluorodeoxyglucose F18 (MeSH) ; Glucose: metabolism (MeSH) ; Hippocampus: diagnostic imaging (MeSH) ; Hippocampus: metabolism (MeSH) ; Magnetic Resonance Spectroscopy (MeSH) ; Maze Learning (MeSH) ; Mice (MeSH) ; Mice, Inbred C3H (MeSH) ; Mice, Inbred C57BL (MeSH) ; Mice, Transgenic (MeSH) ; Microfilament Proteins: metabolism (MeSH) ; Neurons: physiology (MeSH) ; Plaque, Amyloid: diet therapy (MeSH) ; Plaque, Amyloid: pathology (MeSH) ; Positron Emission Tomography Computed Tomography (MeSH) ; Radiopharmaceuticals (MeSH) ; APPswe/PS1delta9 ; [18F]FDG-PET/CT ; amyloid β ; autophagy ; caloric restriction ; iba1 ; Aif1 protein, mouse ; Amyloid beta-Peptides ; Calcium-Binding Proteins ; Microfilament Proteins ; Radiopharmaceuticals ; Fluorodeoxyglucose F18 ; Aspartic Acid ; N-acetylaspartate ; Glucose ; Creatine
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