Metabolomic Insights in Alzheimer's Disease
Summary
The application of metabolomics to Alzheimer’s disease has revealed that perturbations in small-molecule profiles accompany both preclinical and symptomatic stages. Comprehensive analyses of blood, cerebrospinal fluid and brain tissue have identified alterations in energy-related pathways, lipid homeostasis, amino acid metabolism and nitrogen clearance. Key findings include dysregulated sphingolipids and glycerophospholipids in the brain and periphery, shifts in bile acid composition, imbalances in branched-chain amino acids and evidence of disturbed ammonia clearance. These metabolite signatures correlate with amyloid-β deposition, tau pathology and cognitive decline, suggesting that Alzheimer’s is not solely a proteinopathy but also a systemic metabolic disorder. Cross-cohort validation spanning community studies, clinical trials and experimental models underscores the reproducibility of these biomarkers and points towards novel diagnostic and therapeutic avenues, including metabolic activators aimed at restoring mitochondrial function and redox balance. The convergence of lipid, amino acid and nitrogen-related disturbances underscores the importance of integrated metabolic networks in driving neurodegeneration and offers opportunities for early detection, patient stratification and personalised intervention.
Research from Nature Portfolio
Recent studies have used large-scale metabolic phenotyping to demonstrate that Alzheimer’s progression is marked by ammonia dysregulation alongside changes in bile acids, branched-chain amino acids and glutamate-related metabolites. In a multi-centre cohort exceeding 8 000 subjects, elevated blood ammonia tracked clinical stage and amyloid-β burden and improved classification of disease beyond established genetic risk factors. These findings position ammonia homeostasis as both a marker of metabolic stress and a potential target for therapeutic modulation, reinforcing the concept that Alzheimer’s is fundamentally entangled with systemic metabolic disturbances.
Metabolomic Insights in Alzheimer's Disease publication trend
The graph below shows the total number of articles in metabolomic insights in alzheimer's disease across all publications each year (not limited to Nature Index journals).
Technical terms
Metabolomics: The large-scale study of small molecules (metabolites) within cells, tissues or biofluids, reflecting biochemical activity and physiological status.
Metabolite: A small molecule produced or consumed during metabolism, serving as substrates, intermediates or products of enzymatic reactions.
Ammonia homeostasis: The regulation of blood and tissue ammonia levels, crucial for nitrogen balance and neuronal health.
Branched-chain amino acids (BCAAs): Essential amino acids (leucine, isoleucine, valine) involved in protein synthesis and energy metabolism.
Bile acids: Steroid acids synthesised by the liver to facilitate lipid digestion and modulate metabolic signalling.
Nicotinamide adenine dinucleotide (NAD+): A coenzyme central to redox reactions, mitochondrial respiration and cell signalling.
Glutathione: A tripeptide antioxidant that maintains redox balance and protects against oxidative stress.
References
- Metabolic phenotyping reveals an emerging role of ammonia abnormality in Alzheimer’s disease. Nature Communications (2024).
- Combined metabolic activators improve cognitive functions in Alzheimer’s disease patients: a randomised, double-blinded, placebo-controlled phase-II trial. Translational Neurodegeneration (2023).
- Serum Bile Acids Improve Prediction of Alzheimer's Progression in a Sex‐Dependent Manner. Advanced Science (2023).
- Inflammation and the pathological progression of Alzheimer’s disease are associated with low circulating choline levels. Acta Neuropathologica (2023).
- Brain and blood metabolite signatures of pathology and progression in Alzheimer disease: A targeted metabolomics study. PLOS Medicine (2018).
- Application of Metabolomics in Alzheimer’s Disease. Frontiers in Neurology (2018).
- Metabolomics in Early Alzheimer's Disease: Identification of Altered Plasma Sphingolipidome Using Shotgun Lipidomics. PLOS ONE (2011).
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