Abstract
Type 2 diabetes mellitus (T2DM) has a major comorbidity known as diabetes-associated cognitive dysfunction (DACD). Studies have demonstrated that the gut microbiota is crucial in mediating the cognitive abnormalities that occur in diabetic individuals. Additionally, changes in dietary fatty acid intake levels, inflammatory cytokines, and microRNAs (miRs) have an effect on cognitive performance. However, further studies are needed to identify the link between gut microbiota and cognition in T2DM patients and the role that the above indicators play in this process. In order to provide a new rationale for the treatment of cognitive dysfunction in diabetes, this study was conducted in the middle-aged and elderly Beijing population to examine the differences in gut microbiota between DACD and T2DM patients as well as to further explore the role of erythrocyte membrane fatty acids, inflammatory cytokines, and miRs in gut microbiota-mediated cognitive impairment. According to the results, the abundance of norank_f_Eubacterium_coprostanoligenes_group, Acidaminococcus, Enterorhabdus, and norank_f_Clostridium_methylpentosum_group was higher in DACD patients compared to T2DM patients at the genus level. Compared with T2DM patients, plasma interleukin-12 (IL-12) concentrations were significantly higher in DACD patients than in T2DM patients, and IL-12 was significantly positively correlated with norank_f_Eubacterium_coprostanoligenes_group. In addition, plasma miR-142-5p was significantly positively correlated with Enterorhabdus and norank_f_Eubacterium_coprostanoligenes_group. We therefore hypothesize that cognitive impairment in T2DM patients is associated with altered gut microbial composition and that the effect of microbiota on cognition may be mediated through IL-12 and miR-142-5p.
Key points
• Type 2 diabetes with or without cognitive impairment differs in gut microbiota.
• Differential genera of gut microbiota were associated with inflammatory cytokines.
• Differential genera of gut microbiota were associated with plasma microRNAs.
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Data availability
The sequences have been deposited in the NCBI Sequence Read Archive database under the bioproject number PRJNA978383.
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This research was funded by the Natural Science Foundation of Beijing (grant number 7222242) and the National Natural Science Foundation of China (grant number 81773406).
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HH: conceptualization, methodology, software, formal analysis, investigation, writing—original draft, writing—review and editing. JL and JS: software, validation, formal analysis, data curation, investigation. TZ: validation, data curation, investigation. RX: supervision, resources. WM: conceptualization, methodology, resources, writing—review and editing. All authors have read and agreed to the published version of the manuscript.
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Huang, H., Zhao, T., Li, J. et al. Gut microbiota regulation of inflammatory cytokines and microRNAs in diabetes-associated cognitive dysfunction. Appl Microbiol Biotechnol 107, 7251–7267 (2023). https://doi.org/10.1007/s00253-023-12754-3
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DOI: https://doi.org/10.1007/s00253-023-12754-3