Redox signaling in the gastrointestinal tract

Area of Science:

• Gastroenterology
• Cell Biology
• Biochemistry

Background:

• Redox signaling regulates key epithelial cell functions like self-renewal, proliferation, migration, and differentiation.
• NADPH oxidases (NOXs) and reactive oxygen species (ROS) are central mediators of redox signaling in the gut.
• Gut microbiota influences epithelial homeostasis via NOX1 and dual oxidase 2-derived ROS.

Purpose of the Study:

• To elucidate the role of redox signaling in gastrointestinal physiology and pathophysiology.
• To highlight the involvement of redox homeostasis loss in diverse gastrointestinal disorders.
• To explore the dual role of redox signaling in colorectal cancer progression.

Main Methods:

• Review of existing literature on redox signaling in the gastrointestinal tract.
• Analysis of the involvement of specific pathways like Wnt/β-catenin and Notch.
• Examination of the role of reactive oxygen species (ROS) and antioxidant systems.

Main Results:

• Loss of redox homeostasis is implicated in diseases including Barrett's esophagus, peptic ulcers, inflammatory bowel disease, and colorectal cancer.
• Oxidative stress exacerbates mucosal damage in peptic ulcers and contributes to celiac disease pathogenesis.
• Redox signaling in colorectal cancer can promote proliferation via NOX1-driven pathways or inhibit it through pro-apoptotic ROS mechanisms.

Conclusions:

• Redox signaling is a critical determinant of gastrointestinal epithelial cell function.
• Imbalances in redox status are fundamental to the development and progression of numerous gastrointestinal diseases.
• Targeting redox pathways may offer therapeutic strategies for gastrointestinal disorders.