Related Experiment Video

Updated: Jul 17, 2026

Intracerebroventricular Delivery of Gut-Derived Microbial Metabolites in Freely Moving Mice
07:49

Intracerebroventricular Delivery of Gut-Derived Microbial Metabolites in Freely Moving Mice

Published on: June 2, 2022

Inulin alleviates vascular cognitive impairment by restoring prefrontal GABAergic function via

Zhiying Zou1,2, Junxiu Xi3, Juan Li4

  • 1Xijing Hospital, Fourth Military Medical University, Xi'an, China.

Microbiome
|July 16, 2026
PubMed
Abstract

Insights

The prebiotic inulin improves vascular cognitive impairment (VCI) by boosting gut bacteria that produce short-chain fatty acids (SCFAs). These SCFAs restore GABAergic function in the brain, alleviating cognitive deficits.

Area of Science:

  • Neuroscience
  • Microbiology
  • Pharmacology

Background:

  • Vascular cognitive impairment (VCI) affects medial prefrontal cortex (mPFC) function, which depends on GABAergic transmission.
  • Prebiotics may help VCI by altering gut microbiota, but mechanisms are unclear.
  • This study explores if inulin can improve VCI by restoring mPFC GABAergic function via the gut-brain axis.

Purpose of the Study:

  • To investigate the effect of the prebiotic inulin on VCI.
  • To determine if inulin restores GABAergic function in the mPFC.
  • To elucidate the role of the gut-brain axis and short-chain fatty acids (SCFAs) in inulin's effects on VCI.

Main Methods:

  • Used a mouse model of VCI induced by bilateral carotid artery stenosis (BCAS).
  • Administered inulin and assessed cognitive and anxiety-like behaviors.
  • Analyzed gut microbiota composition, mPFC GABAergic transmission, GABA levels, and SCFA receptor expression (GPR41/43).
  • Utilized antibiotic depletion, shRNA knockdown, and pharmacological blockade (bicuculline) to confirm mechanisms.

Main Results:

  • Inulin ameliorated cognitive deficits and anxiety in VCI mice, reshaping gut microbiota towards SCFA producers.
  • Inulin reversed VCI-induced reductions in mPFC GABAergic transmission and GABA levels, correlating with increased SCFA levels.
  • SCFA receptor GPR41/43 upregulation and presynaptic restoration were key mechanisms; blocking these receptors abolished inulin's benefits.
  • GABAergic function was identified as the final pathway for inulin's cognitive and anti-inflammatory effects.

Conclusions:

  • Inulin alleviates VCI by increasing gut-derived SCFAs that activate GPR41/43 in the mPFC, restoring GABAergic function.
  • This study establishes a gut-mPFC pathway mediated by the microbiota-SCFA-GABA axis.
  • Inulin shows therapeutic potential for cognitive disorders by targeting this axis.
Keywords:
GABAergic systemGut microbiotaGut-brain axisInulinShort-chain fatty acidVascular cognitive impairment

Related Concept Videos

Gut-Brain Axis01:22

Gut-Brain Axis

The gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such as...
Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists01:30

Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists

Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function. They...
Microbiota Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...