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Lactobacilli Modulate Epithelial Cytoprotection through the Nrf2 Pathway.

Rheinallt M Jones1, Chirayu Desai2, Trevor M Darby1

  • 1Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA.

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Summary

Gut bacteria, specifically lactobacilli, trigger cellular antioxidant responses in the gut epithelium. This conserved mechanism, involving reactive oxygen species (ROS) and Nrf2 activation, enhances host protection against damage.

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Area of Science:

  • Microbiology
  • Cellular Biology
  • Immunology

Background:

  • The gut microbiota plays a crucial role in host health, but the molecular mechanisms of symbiont-host interactions are not fully understood.
  • Understanding how microbial signals influence host cellular responses is key to characterizing a healthy gut environment.

Purpose of the Study:

  • To investigate the molecular mechanisms by which gut bacteria, specifically lactobacilli, induce protective responses in the host intestinal epithelium.
  • To identify the signaling pathways involved in the communication between symbiotic microbes and host cells.

Main Methods:

  • Experiments were conducted in both mouse and Drosophila models.
  • Cellular reactive oxygen species (ROS) generation was measured in response to lactobacilli.
  • The activation of Nrf2-responsive cytoprotective genes was analyzed.

Main Results:

  • Contact with lactobacilli induced enzymatic generation of cellular ROS in the intestinal epithelium of both mice and Drosophila.
  • This ROS generation led to the activation of Nrf2-responsive cytoprotective genes.
  • These findings demonstrate that the Nrf2 pathway acts as a signaling conduit between gut bacteria and the host.

Conclusions:

  • Lactobacilli-induced ROS signaling is a conserved hormetic adaptation that conditions epithelial cells against exogenous stimuli.
  • The gut microbiota plays a significant role in activating eukaryotic cytoprotective pathways.
  • These findings have implications for understanding eubiosis and host defense mechanisms.