Cited by 216Nitric Oxide and Endothelin EffectsCardiovascular Health and Disease PreventionAtherosclerosis and Cardiovascular Diseases

Elevated Circulating Trimethylamine N-Oxide Levels Contribute to Endothelial Dysfunction in Aged Rats through Vascular Inflammation and Oxidative Stress

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Li, Tiejun, Chen, Yanli, Gua, Chaojun, Li, Xiaodong·2017·Frontiers in Physiology

Abstract

Vascular endothelial dysfunction, a characteristic of the aging process, is an important risk factor for cardiovascular disease in aging. Although vascular inflammation and oxidative stress are major contributors to endothelial dysfunction in aging, the underlying mechanisms during the aging process are not fully understood. Accumulating evidence reveals that gut microbiota-dependent metabolite trimethylamine-N-oxide (TMAO) is implicated in the pathogenesis of many cardiovascular diseases. We tested the hypothesis that aging increases circulating TMAO levels, which induce vascular inflammation and oxidative stress, resulting in age-associated endothelial dysfunction. Old (22-mo-old) and young (4-mo-old) Fischer-344 rats were treated without (control) or with 1.0 % 3,3-Dimethyl-1-butanol (DMB, an inhibitor of trimethylamine formation) in drinking water for 8 weeks. Compared with young control group, old control group had markedly higher plasma TMAO levels, which were reduced by DMB treatment. Endothelium-dependent relaxation of aorta in response to acetylcholine was impaired in old control group compared with young control group as indicated by decreased maximal relaxation (Emax) and reduced area under the curve (AUC). Emax and AUC were both normalized in old rats treated with DMB. No difference in endothelial-independent relaxation in response to sodium nitroprusside was observed among groups. Molecular studies revealed that old control group exhibits increased expression of proinflammatory cytokines and superoxide production, and decreased expression of endothelial nitric-oxide synthase (eNOS) in the aorta, all of which were restored by DMB treatment. These results suggest that aging increases circulating TMAO levels, which may impair eNOS-derived NO bioavailability by increasing vascular inflammation and oxidative stress, contributing to aging-associated endothelial dysfunction.

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Authors
Li, T., Chen, Y., Gua, C., & Li, X.
Affiliations
Sheng Jing Hospital (CN)
Corresponding author
Li, Tiejun
Venue
Frontiers in Physiology
Published
2017-05-30
Volume
8
Pages
350-350
ISSN
1664-042X (ISSN-L)
OpenAlex
W2617058021
Cited by
216
References
46
Citations by year
2026: 18 · 2025: 20 · 2024: 28 · 2023: 30 · 2022: 28 · 2021: 31 · 2020: 22 · 2019: 24 · 2018: 11 · 2017: 4
FWCI
12.34
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Physiology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
China Medical University
Topics
  • Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Health and Disease Prevention
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
Keywords
trimethylamine N-oxide, endothelial dysfunction, aging, vascular inflammation, oxidative stress, gut microbiota metabolites, 3,3-dimethyl-1-butanol, endothelial nitric oxide synthase, nitric oxide bioavailability, inflammatory cytokines, superoxide production, aortic relaxation, acetylcholine, F344 rats

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