Interferon b drives intestinal regeneration after radiation

Area of Science:

• Immunology
• Gastroenterology
• Regenerative Medicine

Background:

• The cGAS-STING pathway is crucial for innate immunity and host defense against cytosolic DNA.
• Cytosolic DNA sensing triggers inflammatory responses and cellular defense mechanisms.

Purpose of the Study:

• To investigate the role of the cGAS-STING pathway in intestinal regeneration following radiation injury.
• To determine the impact of STING deficiency on epithelial response and crypt regeneration after irradiation.

Main Methods:

• Utilized knockout mouse models (cGAS, STING, IFNAR1, CCR2) to assess radiation injury response.
• Administered IFN-β treatment to evaluate its therapeutic potential in radiation-induced damage.
• Analyzed epithelial IFN-β production, inflammation, transcriptional responses, and Lgr5+ stem cell regeneration.

Main Results:

• STING deficiency abrogated IFN-β production, inflammation, and crypt regeneration post-irradiation, without affecting initial DNA damage or apoptosis.
• IFN-β treatment fully rescued intestinal regeneration and survival in STING-deficient mice.
• IFN-β administration improved survival and Lgr5+ stem cell regeneration in wild-type mice by enhancing proliferation and DNA damage repair.

Conclusions:

• The cGAS-STING-dependent type 1 interferon response is essential for intestinal regeneration and recovery from radiation injury.
• Inducible IFN-β production links intestinal stem cell injury to regeneration and holds therapeutic potential for acute radiation injury.