Abstract
Alzheimer's disease (AD) is an insidious neurodegenerative disorder representing a serious continuously escalating medico-social problem. The AD-associated progressive dementia is followed by gradual formation of amyloid plaques and neurofibrillary tangles in the brain. Though, converging evidence indicates apparent metabolic dysfunctions as key AD characteristic. In particular, late-onset AD possesses a clear metabolic signature. Considerable brain insulin signaling impairment and a decline in glucose metabolism are common AD attributes. Thus, positron emission tomography (PET) with glucose tracers is a reliable non-invasive tool for early AD diagnosis and treatment efficacy monitoring. Various approaches and agents have been trialed to modulate insulin signaling. Accumulating data point to arginase inhibition as a promising direction to treat AD via diverse molecular mechanisms involving, inter alia, the insulin pathway. Here, we use a transgenic AD mouse model, demonstrating age-dependent brain insulin signaling abnormalities, reduced brain insulin receptor levels, and substantial energy metabolism alterations, to evaluate the effects of arginase inhibition with Norvaline on glucose metabolism. We utilize fluorodeoxyglucose whole-body micro-PET to reveal a significant treatment-associated increase in glucose uptake by the brain tissue in-vivo. Additionally, we apply advanced molecular biology and bioinformatics methods to explore the mechanisms underlying the effects of Norvaline on glucose metabolism. We demonstrate that treatment-associated improvement in glucose utilization is followed by significantly elevated levels of insulin receptor and glucose transporter-3 expression in the mice hippocampi. Additionally, Norvaline diminishes the rate of Tau protein phosphorylation. Our results suggest that Norvaline interferes with AD pathogenesis. These findings open new avenues for clinical evaluation and innovative drug development.
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Data Availability
The analyzed data sets generated during the study are available from the corresponding author on reasonable request.
Abbreviations
- AD:
-
Alzheimer’s disease
- 3 × Tg:
-
Triple-transgenic mouse model of Alzheimer’s disease
- PET:
-
Positron emission tomography
- CT:
-
Computed tomography
- Aβ:
-
Amyloid-beta
- NFT:
-
Neurofibrillary tangles
- CNS:
-
Central nervous system
- GLUT:
-
Glucose transporter
- WT:
-
Wild-type
- KEGG:
-
Kyoto Encyclopedia of Genes and Genomes
- BCAA:
-
Branched chain amino acid
- OD:
-
Optical density
- ANOVA:
-
Analysis of variance
- HDAC:
-
Histone deacetylase
- mTOR:
-
Mechanistic Target of Rapamycin
- S6K1:
-
Ribosomal S6 kinase 1
- PDPK1:
-
3-Phosphoinositide-dependent protein kinase-1
- AKT:
-
RAC-alpha serine/threonine-protein kinase
- CA:
-
Cornus Ammonis
- SEM:
-
Standard error of the mean
- mRNA:
-
Messenger ribonucleic acid
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Acknowledgements
We gratefully acknowledge Dr. Zohar Gavish for his help with immunohistochemistry.
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This research was supported by Marie Curie CIG Grant 322113, Leir Foundation Grant, Ginzburg Family Foundation Grant, and Katz Foundation Grant (all to AOS).
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BP and AS designed the experiments. BP was involved in all the aspects of the work and wrote the manuscript. KDS assisted in tissue sampling, western blot, immunohistochemistry, and initial data analysis. MS assisted in conducting the in-silico part. VG assisted in PET-CT experiments and statistical analysis. MA assisted in data analysis. AOS conceived, designed, supervised the experiments, and edited the manuscript.
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Table S1. Selected results of the antibody array. Only proteins with a significant (p < 0.05) fold change from the control (CFC) are displayed. The cut-off was set at ±45% change (DOCX 28 KB)
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Polis, B., Squillario, M., Gurevich, V. et al. Effects of Chronic Arginase Inhibition with Norvaline on Tau Pathology and Brain Glucose Metabolism in Alzheimer's Disease Mice. Neurochem Res 47, 1255–1268 (2022). https://doi.org/10.1007/s11064-021-03519-3
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DOI: https://doi.org/10.1007/s11064-021-03519-3