The gut microbiota-derived metabolite trimethylamine N-oxide is elevated in Alzheimer's disease.

Abstract

BACKGROUND:

Trimethylamine N-oxide (TMAO), a small molecule produced by the metaorganismal metabolism of dietary choline, has been implicated in human disease pathogenesis, including known risk factors for Alzheimer's disease (AD), such as metabolic, cardiovascular, and cerebrovascular disease.

METHODS:

In this study, we tested whether TMAO is linked to AD by examining TMAO levels in cerebrospinal fluid (CSF) collected from a large sample (n = 410) of individuals with Alzheimer's clinical syndrome (n = 40), individuals with mild cognitive impairment (MCI) (n = 35), and cognitively-unimpaired individuals (n = 335). Linear regression analyses were used to determine differences in CSF TMAO between groups (controlling for age, sex, and APOE ε4 genotype), as well as to determine relationships between CSF TMAO and CSF biomarkers of AD (phosphorylated tau and beta-amyloid) and neuronal degeneration (total tau, neurogranin, and neurofilament light chain protein).

RESULTS:

CSF TMAO is higher in individuals with MCI and AD dementia compared to cognitively-unimpaired individuals, and elevated CSF TMAO is associated with biomarkers of AD pathology (phosphorylated tau and phosphorylated tau/Aβ42) and neuronal degeneration (total tau and neurofilament light chain protein).

CONCLUSIONS:

These findings provide additional insight into gut microbial involvement in AD and add to the growing understanding of the gut-brain axis.

• Authors: Nicholas M Vogt, Kymberleigh A Romano, Burcu F Darst, Corinne D Engelman, Sterling C Johnson, Cynthia M Carlsson, Sanjay Asthana, Kaj Blennow, Henrik Zetterberg, Barbara B Bendlin, Federico E Rey
• Journal: Alzheimer's research & therapy (Alzheimers Res Ther) Vol. 10 Issue 1 Pg. 124 (12 22 2018) ISSN: 1758-9193 [Electronic] England
• PMID: 30579367 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• Amyloid beta-Peptides
• Biomarkers
• MAPT protein, human
• Methylamines
• Peptide Fragments
• amyloid beta-protein (1-40)
• amyloid beta-protein (1-42)
• tau Proteins
• trimethyloxamine

Topics

• Aged
• Alzheimer Disease (cerebrospinal fluid, microbiology)
• Amyloid beta-Peptides (cerebrospinal fluid)
• Biomarkers (cerebrospinal fluid)
• Cognitive Dysfunction (cerebrospinal fluid, microbiology)
• Female
• Gastrointestinal Microbiome
• Humans
• Male
• Methylamines (cerebrospinal fluid)
• Middle Aged
• Peptide Fragments (cerebrospinal fluid)
• tau Proteins (cerebrospinal fluid)