Ketamine induced gut microbiota dysbiosis and barrier and hippocampal dysfunction in rats

Area of Science:

• Neuroscience
• Microbiology
• Pharmacology

Background:

• The microbiota-gut-brain axis (MGBA) is crucial in drug addiction.
• The specific mechanisms of MGBA in ketamine addiction are not well understood.

Purpose of the Study:

• To investigate ketamine-induced gut microbiota disorders.
• To examine intestinal barrier dysfunction.
• To analyze alterations in brain function within a rat model of ketamine addiction.

Main Methods:

• Utilized a conditioned place preference (CPP) model in rats to study ketamine addiction.
• Assessed gut microbiota composition and intestinal morphology (ileum villi length, colonic mucosa thickness).
• Measured brain function using amplitude of low-frequency fluctuation (ALFF) in the hippocampus and examined hippocampal neuron morphology.

Main Results:

• Ketamine exposure led to decreased hippocampal ALFF values and neuronal changes.
• Significant alterations in gut microbiota composition were observed.
• Intestinal barrier dysfunction was evidenced by shortened ileum villi and thinner colonic mucosa.
• Gut microbiota abundance correlated with CPP score, hippocampal ALFF, and intestinal parameters.

Conclusions:

• Ketamine addiction is associated with abnormal alterations in the microbiota-gut-brain axis in rats.
• These findings enhance the understanding of ketamine addiction mechanisms.
• The study suggests potential for novel therapeutic strategies targeting the MGBA for ketamine addiction treatment.