Radiotherapy Induces Intestinal Barrier Dysfunction by Inhibiting Autophagy

Area of Science:

• Gastroenterology
• Molecular Biology
• Radiation Oncology

Background:

• Radiation enteritis is a frequent complication of abdominal radiation therapy.
• The molecular mechanisms underlying radiation-induced intestinal barrier dysfunction remain unclear.
• Autophagy's role in radiation enteritis requires further investigation.

Purpose of the Study:

• To elucidate the role of autophagy in radiation-induced intestinal barrier impairment.
• To investigate the therapeutic potential of modulating autophagy in radiation enteritis.

Main Methods:

• Mice were subjected to abdominal irradiation (IR).
• Autophagy was modulated using rapamycin (activator) and 3-methyladenine (inhibitor).
• Assessed oxidative stress, inflammatory markers, antioxidant indices, mitochondrial function, apoptosis, and intestinal barrier integrity markers.

Main Results:

• IR increased autophagy-related gene expression in colonic mucosa.
• Rapamycin treatment reduced oxidative stress, inflammation, and apoptosis markers.
• Rapamycin improved antioxidant capacity, mitochondrial function, and intestinal barrier integrity (increased tight junction proteins).
• Autophagy inhibition with 3-methyladenine exacerbated radiation-induced damage.

Conclusions:

• Inhibition of autophagy is a key mechanism in radiation-induced intestinal barrier dysfunction.
• Activating autophagy, for example with rapamycin, offers a potential therapeutic strategy to mitigate radiation enteritis.
• These findings enhance understanding of radiation enteritis pathogenesis.