Acute ischaemic stroke (AIS) seriously affects patient quality
of life. We explored the role of the intestinal microbiota on
oxidative stress and autophagy in stroke, and Astragaloside
IV (AS-IV) reversed the changes induced by intestinal microbiota.
We determined the characteristics of the intestinal
microbiota of AIS and transient ischaemic attack (TIA) patients
by 16S sequencing and found that the structure and diversity
of the intestinal microbiota in patients with AIS and
TIA were significantly different from those in healthy subjects.
Specifically, the abundance of genus Bifidobacterium,
Megamonas, Blautia, Holdemanella, and Clostridium, content
of homocysteine and triglyceride was increased significantly,
thus it may be as a potential mechanism of AIS and
TIA. Furthermore, germ-free mice were infused intracolonically
with fecal supernatants of TIA and AIS with/without
feed AS-IV for 12 weeks, and we found that the feces of AIS
up-regulated the autophagy markers Beclin-1, light chain 3
(LC3)-II and autophagy-related gene (Atg)12, and the expression
of reactive oxygen species (ROS) and NADPH oxidase
2/4 (NOX2/4), malondialdehyde (MDA), however, the
expression of total antioxidant capacity (T-AOC) and activity
of superoxide dismutase (SOD) and glutathione (GSH)
was down-regulated in brain tissue, the content of homocysteine
and free fatty acids (FFA) in serum of the mice. Meanwhile,
AS-IV could reverse the above phenomenon, however,
it does not affect the motor function of mice. AS-IV reversed
these changes and it may be a potential drug for AIS therapeutics.
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