TIAN Xiaoping,XIA Jun,WEI Jingwen,et al.Mechanisms of Danggui Shaoyaosan in Improving Cognitive Ability in SAMP8 Mice by Regulating Gut Microbiota via 16S rDNA Sequencing[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(24):26-34.
TIAN Xiaoping,XIA Jun,WEI Jingwen,et al.Mechanisms of Danggui Shaoyaosan in Improving Cognitive Ability in SAMP8 Mice by Regulating Gut Microbiota via 16S rDNA Sequencing[J].Chinese Journal of Experimental Traditional Medical Formulae,2022,28(24):26-34. DOI: 10.13422/j.cnki.syfjx.20221909.
Mechanisms of Danggui Shaoyaosan in Improving Cognitive Ability in SAMP8 Mice by Regulating Gut Microbiota via 16S rDNA Sequencing
To analyze the effects of Danggui Shaoyaosan (DSS) on the gut microbiota of the Alzheimer's disease (AD) model in SAMP8 mice based on 16S rDNA sequencing.
Method
2
Twenty-four SAMP8 mice aged seven months were randomly divided into low-, medium-, and high-dose DSS groups (14.4, 28.8, 57.6 g·kg
-1
·d
-1
) and a model group according to a random number table, with six rats in each group. Six SAMR1 mice of the same age were assigned to the normal group. After intragastric administration for eight consecutive weeks, 16S rDNA sequencing was performed to detect the gut microbiota of feces in mice. Morris water maze was employed to assess the directional navigation and space exploration ability of mice. Nissl staining was performed to observe the pathological changes of neurons in the hippocampal CA1 area. Enzyme-linked immunosorbent assay (ELISA) was adopted to measure the protein content of hippocampal amyloid
β
-protein (A
β
) and hyperphosphorylated Tau (p-Tau).
Result
2
Compared with the normal group, the model group presented a declining
α
diversity (
P
<
0.05), markedly altered
β
diversity, prolonged escape latency (
P
<
0.05), reduced number of platform crossings and cumulative duration in the targeted quadrant (
P
<
0.05), decreased neurons and Nissl bodies in the CA1 hippocampal area, and up-regulated A
β
and p-Tau expression (
P
<
0.05). However, DSS intervention enhanced the
α
diversity, and medium- and high-dose DSS, especially the medium-dose DSS, could result in
α
diversity similar to the control group. Moreover, at the phylum level, the abundance of Firmicutes increased (
P
<
0.05), while the abundance of Bacteroidetes and Proteobacteria decreased (
P
<
0.05). At the genus level, the abundance of
Lactobacillus
and other genera increased (
P
<
0.05), while the abundance of
Bacteroides
,
Helicobacterium
,
Rikenella
,
Parabacteroides
,
Sutterella
, and
Mucilaginibacter
decreased (
P
<
0.05). The DSS groups also showed shortened escape latency (
P
<
0.05), increased number of platform crossings and cumulative duration in the targeted quadrant (
P
<
0.05), increased Nissl bodies (
P
<
0.05), and reduced A
β
and p-Tau content (
P
<
0.05). Pearson correlation analysis showed that the abundance of
Mucilaginibacter
,
Bacteroides
, and
Sutterella
was negatively correlated with the cognitive ability of SAMP8 mice, while the abundance of
Lactobacillus
and
Butyricimonas
was positively correlated with the cognitive ability of SAMP8 mice.
Conclusion
2
DSS can improve the cognitive ability of SAMP8 mice, and its mechanism may be related to the regulation of gut microbiota diversity and community composition.
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