Effect of Microglial Activity on Gut Microbiota in Rats with Neuropathic Pain

Area of Science:

• Neuroscience
• Microbiology
• Pharmacology

Background:

• Neuropathic pain (NP) involves complex mechanisms including neuroinflammation.
• The gut microbiota is increasingly recognized for its role in central nervous system disorders.
• The interplay between NP, microglial activation, and gut microbiota remains incompletely understood.

Purpose of the Study:

• To investigate the relationship between microglial activity and gut microbiota composition in a rat model of NP.
• To evaluate the effects of pregabalin on these parameters in NP rats.

Main Methods:

• Neuropathic pain was induced in rats via sciatic nerve ligation and transection.
• Rats were treated with pregabalin (10 mg/kg) or saline.
• Microglial activity, cytokine levels, and gut microbiota composition (Firmicutes/Bacteroidetes ratio) were assessed.

Main Results:

• Pregabalin significantly reduced microglial activity and modulated pro-inflammatory and anti-inflammatory cytokine levels.
• The Firmicutes/Bacteroidetes ratio increased in control rats post-surgery.
• Pregabalin treatment led to a beneficial shift in the Firmicutes/Bacteroidetes ratio, approaching pre-surgery levels.

Conclusions:

• Pregabalin treatment ameliorates microglial activity in a rat model of neuropathic pain.
• Pregabalin administration is associated with a favorable modulation of gut microbiota composition in NP rats.
• These findings suggest a link between pregabalin's efficacy and its impact on the gut-brain axis.