Related Experiment Video
Updated: May 15, 2026
09:29
Stereotactic Atlas-Guided Laser Capture Microdissection of Brain Regions Affected by Traumatic Injury
Published on: September 11, 2017
9.1K
Gut Microbial Tryptophan Metabolism Is Involved in Post-Cardiac Arrest Brain Injury via Pyroptosis Modulation.
Chenghao Wu1,2, Mengyuan Diao3, Shuhang Yu4
1Department of Emergency Medicine, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
CNS Neuroscience & Therapeutics
|April 22, 2025
Summary
Eliminating gut microbiota improved survival and neurological outcomes after cardiac arrest in rats. This suggests microbial tryptophan metabolites, specifically kynurenine, play a role in post-cardiac arrest brain injury.
Area of Science:
- Neuroscience
- Microbiology
- Immunology
Background:
- Post-cardiac arrest brain injury (PCABI) is a major cause of mortality and disability.
- The microbiota-gut-brain axis is implicated in neurological disorders, but its role in PCABI is unexplored.
- Microbial tryptophan metabolites are potential mediators in this axis.
Purpose of the Study:
- To investigate the role of microbial tryptophan metabolites in PCABI.
- To explore the microbiota-gut-brain axis connection in PCABI.
Main Methods:
- Rats were pretreated with antibiotics (Abx) to deplete gut microbiota before inducing cardiac arrest/cardiopulmonary resuscitation (CA/CPR).
- Assessed survival rates and neurological outcomes.
- Utilized 16s rDNA sequencing, PICRUSt2, metabolomic profiling, and in vitro/in vivo molecular techniques (qRT-PCR, immunohistochemistry, immunofluorescence).
Main Results:
- Antibiotic treatment improved 24-h survival and neurological function in rats post-CA/CPR.
- Abx altered microbial composition, increasing microbial tryptophan metabolism, particularly via the kynurenine pathway.
- Elevated kynurenine levels in feces, circulation, and brain correlated with upregulated aryl hydrocarbon receptor (AhR) and inhibited NLRP3-induced pyroptosis.
Conclusions:
- The gut microbiota and microbiota-gut-brain axis are crucial in PCABI progression.
- Kynurenine may exert neuroprotective effects by inhibiting NLRP3-induced pyroptosis in PCABI.
- This study highlights kynurenine as a potential therapeutic target for PCABI.
Related Concept Videos
01:29Amino Acid Biosynthetic Pathways
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...
01:22Gut-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...
01:28Traumatic Brain Injury l: Introduction
DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...