Peroxiredoxin 3 Deficiency Exacerbates DSS-Induced Acute Colitis via Exosomal miR-1260b-Mediated Barrier Disruption...

Area of Science:

• Mitochondrial biology
• Gastroenterology
• Cellular redox homeostasis

Background:

• Peroxiredoxin3 (Prdx3) is a mitochondrial antioxidant enzyme crucial for removing reactive oxygen species (ROS).
• Oxidative stress and antioxidant imbalance are implicated in inflammatory bowel disease (IBD) pathogenesis.
• The specific role of Prdx3 in the intestinal epithelium during inflammation remains unclear.

Purpose of the Study:

• To investigate the function of Prdx3 in the intestinal epithelium during acute colitis.
• To elucidate the molecular mechanisms by which Prdx3 deficiency impacts intestinal inflammation and barrier integrity.

Main Methods:

• Utilized intestinal epithelial cell (IEC)-specific Prdx3-knockout mice to model colitis.
• Assessed colitis severity, colon morphology, intestinal barrier function, mitochondrial damage, and ROS levels.
• Analyzed exosomal microRNA (miRNA) expression and key signaling pathways (p38 MAPK/NFκB).

Main Results:

• IEC-specific Prdx3 deficiency exacerbated colitis, leading to increased body weight loss, colon shortening, and barrier disruption.
• Prdx3-deficient IECs exhibited heightened ROS generation and mitochondrial damage.
• Exosomal miR-1260b levels were significantly elevated in Prdx3-knockdown colonic cells, and Prdx3 deficiency activated p38 MAPK/NFκB signaling.

Conclusions:

• Prdx3 plays a critical protective role in the intestinal epithelium against acute colitis.
• Prdx3 deficiency promotes intestinal barrier disruption and inflammation through the p38 MAPK/NFκB pathway.
• Exosome-mediated miR-1260b dysregulation is implicated in IBD pathogenesis, suggesting potential therapeutic targets.