Cited by 48Neurological Disease Mechanisms and TreatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Higher Circulating Trimethylamine N-Oxide Aggravates Cognitive Impairment Probably via Downregulating Hippocampal SIRT1 in Vascular Dementia Rats

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Deng, Yang, Zou, Junqing, Hong, Ye, Peng, Qiang, Fu, Xinxin, Duan, Rui, Chen, Jie, Chen, Xiangliang·2022·Cells

Abstract

Oxidative stress and inflammation damage play pivotal roles in vascular dementia (VaD). Trimethylamine N-oxide (TMAO), an intestinal microbiota-stemming metabolite, was reported to promote inflammation and oxidative stress, involved in the etiology of several diseases. Still, these effects have not been investigated in VaD. Here, we tested whether pre-existing, circulating, high levels of TMAO could affect VaD-induced cognitive decline. TMAO (120 mg/kg) was given to rats for a total of 8 weeks, and these rats underwent a sham operation or bilateral common carotid artery (2VO) surgery after 4 weeks of treatment. Four weeks after surgery, the 2VO rats exhibited hippocampal-dependent cognitive function declines and synaptic plasticity dysfunction, accompanied by an increase in oxidative stress, neuroinflammation, and apoptosis. TMAO administration, which increased plasma and hippocampal TMAO at 4 weeks postoperatively, further aggravated these effects, resulting in exaggerated cognitive and synaptic plasticity impairment, though not within the Sham group. Moreover, TMAO treatment activated the NLRP3 inflammasome and decreased SIRT1 protein expression within the hippocampus. However, these effects of TMAO were significantly attenuated by the overexpression of SIRT1. Our findings suggest that TMAO increases oxidative stress-induced neuroinflammation and apoptosis by inhibiting the SIRT1 pathway, thereby exacerbating cognitive dysfunction and neuropathological changes in VaD rats.

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Authors
Deng, Y., Zou, J., Hong, Y., Peng, Q., Fu, X., Duan, R., Chen, J., & Chen, X.
Affiliations
  • China Pharmaceutical University (CN)
  • Nanjing First Hospital (CN)
Corresponding author
  • Duan, Rui
  • Chen, Jie
  • Chen, Xiangliang
Venue
Cells
Publisher
MDPI AG
Published
2022-11-17
Volume
11
Issue
22
Pages
3650
ISSN
2073-4409 (ISSN-L)
OpenAlex
W4309455544
Cited by
48
References
56
Citations by year
2026: 11 · 2025: 20 · 2024: 14 · 2023: 3
FWCI
3.25
Type
journal article
Language
en
Open access
Locations
  • Cells (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (81701064, JQX20007, BK20220196, 2022M711666)
  • Medical Science and Technology Program of Nanjing (81701064, JQX20007, BK20220196, 2022M711666)
  • Natural Science Foundation of Jiangsu Province (81701064, JQX20007, BK20220196, 2022M711666)
  • China Postdoctoral Science Foundation (81701064, JQX20007, BK20220196, 2022M711666)
  • Xinghuo Talent Program of Nanjing First Hospital (81701064, JQX20007, BK20220196, 2022M711666)
Topics
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
trimethylamine N-oxide, vascular dementia, cognitive impairment, SIRT1, hippocampus, oxidative stress, neuroinflammation, apoptosis, NLRP3 inflammasome, synaptic plasticity, bilateral common carotid artery occlusion, gut microbiota metabolites
MeSH terms
Animals, Hippocampus, Inflammation, Methylamines, Vascular Diseases, Dementia, Vascular, Rats, Sirtuin 1, Cognitive Dysfunction

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