Akkermansia muciniphila alleviates antibiotic- and LPS-induced oxidative stress via the p38α MAPK-Nrf2 signaling axis

Area of Science:

• Microbiology
• Cell Biology
• Gastroenterology

Background:

• Antibiotic misuse and infection disrupt the intestinal epithelial kinome, leading to barrier dysfunction.
• p38α hyperphosphorylation (MAPK14) is a key molecular trigger for intestinal barrier failure.
• Effective therapeutic targets for this dysregulation are currently limited.

Purpose of the Study:

• To investigate the protective mechanisms of Akkermansia muciniphila (AKK) in an antibiotic-induced enteropathy model.
• To determine if AKK modulates specific host signaling pathways to mitigate intestinal damage.
• To explore the potential of AKK as a therapeutic agent for antibiotic-associated intestinal disorders.

Main Methods:

• Utilized a co-exposure model of antibiotic and lipopolysaccharide (LPS) to induce enteropathy.
• Administered Akkermansia muciniphila (AKK) to assess its effects on host signaling.
• Analyzed the modulation of the p38α MAPK-Nrf2 signaling pathway and downstream effects.

Main Results:

• AKK reactivated the p38α MAPK-Nrf2 signaling pathway.
• AKK alleviated p38α-mediated suppression of Nrf2, enhancing antioxidant enzyme expression (HO-1, NQO1).
• AKK reduced reactive oxygen species (ROS) production and restored intestinal epithelial integrity and mucus layers.

Conclusions:

• Established the AKK-p38α MAPK-Nrf2 axis as a druggable target for antibiotic-associated intestinal disease.
• AKK demonstrates potential for developing oral, mechanism-defined microecological therapies.
• This research provides a molecular basis for precise therapeutic interventions in gut barrier dysfunction.