Cited by 79Gut microbiota and healthDementia and Cognitive Impairment ResearchGastrointestinal motility and disorders

Altered gut microbiota in adults with subjective cognitive decline: the SILCODE study

Sheng, Can, Lin, Li, Lin, Hua, Wang, Xiaoni, Han, Ying, Liu, Shu-Lin·2021·Journal of Alzheimer s Disease

Abstract

BACKGROUND: Subjective cognitive decline (SCD) is the earliest symptomatic manifestation of preclinical Alzheimer's disease (AD). Gut microbiota may serve as a susceptibility factor for AD. Altered gut microbiota has been reported in patients with mild cognitive impairment (MCI) and AD dementia. However, whether gut microbial compositions changed in SCD remains largely unknown. OBJECTIVE: To characterize the gut microbiota in SCD. METHODS: In this study, a total of 105 participants including 38 normal controls (NC), 53 individuals with SCD, and 14 patients with cognitive impairment (CI) were recruited. Gut microbiota of all participants isolated from fecal samples were investigated using 16S ribosomal RNA (rRNA) Illumina Miseq sequencing technique. The gut microbial compositions were compared among the three groups, and the association between altered gut microbiota and cognitive performance was analyzed. To validate the alteration of gut microbiota in SCD, we conducted amyloid positron emission tomography (PET) in selected participants and further compared the gut microbiota among subgroups. RESULTS: The abundance of phylum Firmicutes, class Clostridia, order Clostridiales, family Ruminococcaceae, and genus Faecalibacterium showed a trend toward a progressive decline from NC to SCD and CI. Specifically, the abundance of the anti-inflammatory genus Faecalibacterium was significantly decreased in SCD compared with NC. In addition, altered bacterial taxa among the three groups were associated with cognitive performance. The findings were validated in SCD participants with positive amyloid evidence. CONCLUSION: The composition of gut microbiota is altered in individuals with SCD. This preliminary study will provide novel insights into the pathophysiological mechanism of AD.

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Crossref · 10.3233/jad-210259

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  • Human studies comparing the composition of the GM of elderly participants suffering from cognitive impairment with healthy individuals indicate significant changes in GM composition, specifically an increase in pro-inflammatory taxa and a reduction in anti-inflammatory taxa.

    “Human studies comparing the composition of the GM of elderly participants suffering from cognitive impairment with healthy individuals indicate significant changes in GM composition. Specifically, there is an increase in pro-inflammatory taxa and a reduction in anti-inflammatory taxa (104–109).”

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Authors
Sheng, C., Lin, L., Lin, H., Wang, X., Han, Y., & Liu, S.-L.
Affiliations
  • Capital Medical University (CN)
  • Department of Neurology, Xuanwu Hospital of Capital Medical University, Beijing, China
  • Harbin Medical University (CN)
Corresponding author
  • Sheng, Can
  • Wang, Xiaoni
  • Han, Ying
Venue
Journal of Alzheimer s Disease
Published
2021-07-21
Volume
82
Issue
2
Pages
513-526
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W3163953848
Cited by
78
References
57
Citations by year
2026: 10 · 2025: 19 · 2024: 17 · 2023: 19 · 2022: 13
FWCI
3.85
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Alzheimer s Disease (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
Keywords
subjective cognitive decline, gut microbiota
MeSH terms
Gastrointestinal Microbiome, Aged, Alzheimer Disease, Brain, China, Cognition, Feces, Female, Humans, Male, Neuropsychological Tests, RNA, Ribosomal, 16S, Early Diagnosis, Positron-Emission Tomography, Plaque, Amyloid, Diagnostic Self Evaluation, Cognitive Dysfunction

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