ArticleNutrients2022
One-Carbon Metabolism in Alzheimer's Disease and Parkinson's Disease Brain Tissue.
Article in Nutrients, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 24 papers, 1 of them a synthesis that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
24 citing papers in PubMed, 1 synthesis or guideline pooled it, 29 citations in OpenAlex.
- Omics research in Parkinson's disease: evolution, integrated analysis, pathogenic mechanisms, biomarkers, and therapeutic targets.Frontiers in molecular neuroscience · 2026Pooled it
- Brain B Vitamin Status and One-Carbon Metabolism Gene Polymorphisms are Associated with Cognitive Impairment in Alzheimer's and Parkinson's Disease.bioRxiv : the preprint server for biology · 2026Article
- Metabolomic Cerebrospinal Fluid Biomarkers for the Diagnosis of Atypical Parkinsonian Syndromes.International journal of molecular sciences · 2026Article
- Smart Nanomedicines for Neurodegenerative Diseases: Empowering New Therapies with Molecular Imaging and Artificial Intelligence.Molecular diagnosis & therapy · 2026Review
- Betaine: A Promising Natural Product for Neurological and Psychiatric Diseases.Current neuropharmacology · 2026Review
- Bidirectional Causal Associations Between Plasma Metabolites and Parkinson's Disease.Molecular neurobiology · 2025Article
- Contrasting Effects of Phosphatidylcholine and Betaine Supplementation on Embryonic Development in a Mouse Model of the MTHFD1 R653Q Variant.The Journal of nutrition · 2025Article
- Acetylcholinesterase inhibitors considerably affect the salivary microbiome in patients with Alzheimer's disease.iScience · 2025Article
- Application of IVDr NMR spectroscopy to stratify Parkinson's disease with absolute quantitation of blood serum metabolites and lipoproteins.Scientific reports · 2025Article
- Untargeted urine metabolomics reveals dynamic metabolic differences and key biomarkers across different stages of Alzheimer's disease.Frontiers in aging neuroscience · 2025Article
- Association analyses of nutritional markers with Parkinson's disease and Alzheimer's disease.Heliyon · 2024Article
- The Therapeutic Potential of Hemp Seed Oil in D-Galactose-Induced Aging Rat Model Was Determined through the Combined Assessment ofMetabolites · 2024Article
- SHMT2 Mediates Small-Molecule-Induced Alleviation of Alzheimer Pathology Via the 5'UTR-dependent ADAM10 Translation Initiation.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2024Article
- Article
- sc2MeNetDrug: A computational tool to uncover inter-cell signaling targets and identify relevant drugs based on single cell RNA-seq data.PLoS computational biology · 2024Article
- Association of plasma homocysteine with cognitive impairment in patients with Parkinson's disease.Frontiers in aging neuroscience · 2024Article
- Prenatal folic acid and vitamin BCommunications biology · 2023Article
- Defective quality control autophagy in Hyperhomocysteinemia promotes ER stress and consequent neuronal apoptosis through proteotoxicity.Cell communication and signaling : CCS · 2023Article
- Targeted metabolomic analysis in Parkinson's disease brain frontal cortex and putamen with relation to cognitive impairment.NPJ Parkinson's disease · 2023Article
- Identification of key genes and signaling pathways associated with dementia with Lewy bodies and Parkinson's disease dementia using bioinformatics.Frontiers in neurology · 2023Article
Corrections and comments
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Authors and funding
3 authors at 2 institutions in 1 country.
Funding
Abstract
Disruptions in one-carbon metabolism and elevated homocysteine have been previously implicated in the development of dementia associated with Alzheimer's disease (AD) and Parkinson's disease (PD). Moreover, a PD diagnosis itself carries substantial risk for the development of dementia. This is the first study that explores alterations in one-carbon metabolism in AD and PD directly in the human brain frontal cortex, the primary center of cognition. Applying targeted liquid chromatography-tandem mass spectrometry (LC-MS/MS), we analyzed post-mortem samples obtained from 136 subjects (35 AD, 65 PD, 36 controls). We found changes in one-carbon metabolites that indicate inefficient activation of cystathionine β-synthase (CBS) in AD and PD subjects with dementia, the latter seemingly accompanied by a restricted re-methylation flow. Levodopa-carbidopa is known to reduce available vitamin B6, which would explain the hindered CBS activity. We present evidence of temporary non-protein-bound homocysteine accumulation upon levodopa intake in the brain of PD subjects with dementia but not in non-demented PD subjects. Importantly, this homocysteine elevation is not related to levodopa dosage, disease progression, or histopathological markers but exclusively to the dementia status. We hypothesize that this levodopa-induced effect is a direct cause of dementia in PD in susceptible subjects with reduced re-methylation capacity. Furthermore, we show that betaine best correlates with cognitive score even among PD subjects alone and discuss nutritional recommendations to improve one-carbon metabolism function.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.