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Published in: Journal of Neuroinflammation 1/2023

Open Access 01-12-2023 | Alzheimer's Disease | Research

Inhibition of microfold cells ameliorates early pathological phenotypes by modulating microglial functions in Alzheimer’s disease mouse model

Authors: Namkwon Kim, In Gyoung Ju, Seung Ho Jeon, Yeongae Lee, Min-Ji Jung, Min Sung Gee, Jae Seok Cho, Kyung-Soo Inn, Lee Ann Garrett-Sinha, Myung Sook Oh, Jong Kil Lee

Published in: Journal of Neuroinflammation | Issue 1/2023

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Abstract

Background

The gut microbiota has recently attracted attention as a pathogenic factor in Alzheimer’s disease (AD). Microfold (M) cells, which play a crucial role in the gut immune response against external antigens, are also exploited for the entry of pathogenic bacteria and proteins into the body. However, whether changes in M cells can affect the gut environments and consequently change brain pathologies in AD remains unknown.

Methods

Five familial AD (5xFAD) and 5xFAD-derived fecal microbiota transplanted (5xFAD-FMT) naïve mice were used to investigate the changes of M cells in the AD environment. Next, to establish the effect of M cell depletion on AD environments, 5xFAD mice and Spib knockout mice were bred, and behavioral and histological analyses were performed when M cell-depleted 5xFAD mice were six or nine months of age.

Results

In this study, we found that M cell numbers were increased in the colons of 5xFAD and 5xFAD-FMT mice compared to those of wild-type (WT) and WT-FMT mice. Moreover, the level of total bacteria infiltrating the colons increased in the AD-mimicked mice. The levels of M cell-related genes and that of infiltrating bacteria showed a significant correlation. The genetic inhibition of M cells (Spib knockout) in 5xFAD mice changed the composition of the gut microbiota, along with decreasing proinflammatory cytokine levels in the colons. M cell depletion ameliorated AD symptoms including amyloid-β accumulation, microglial dysfunction, neuroinflammation, and memory impairment. Similarly, 5xFAD-FMT did not induce AD-like pathologies, such as memory impairment and excessive neuroinflammation in Spib−/− mice.

Conclusion

Therefore, our findings provide evidence that the inhibiting M cells can prevent AD progression, with therapeutic implications.
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Literature
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Metadata
Title
Inhibition of microfold cells ameliorates early pathological phenotypes by modulating microglial functions in Alzheimer’s disease mouse model
Authors
Namkwon Kim
In Gyoung Ju
Seung Ho Jeon
Yeongae Lee
Min-Ji Jung
Min Sung Gee
Jae Seok Cho
Kyung-Soo Inn
Lee Ann Garrett-Sinha
Myung Sook Oh
Jong Kil Lee
Publication date
01-12-2023
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2023
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/s12974-023-02966-9

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