Corticotropin-Releasing Hormone Receptor 2 Signaling Promotes Mucosal Repair Responses after Colitis

Area of Science:

• Gastroenterology
• Immunology
• Cell Biology

Background:

• The corticotropin-releasing hormone (CRH) family influences intestinal function.
• Corticotropin-releasing hormone receptor 2 (CRHR2) plays a dual role in colitis, promoting inflammation in acute phases but inhibiting it in chronic stages.

Purpose of the Study:

• To investigate the role of CRHR2 signaling in colonic mucosal repair after dextran sodium sulfate (DSS)-induced colitis.
• To determine if modulating CRHR2 activity can stimulate epithelial cell proliferation, migration, and wound healing.

Main Methods:

• DSS-induced colitis model in mice treated with a CRHR2 antagonist or vehicle.
• Evaluation of colonic tissue in wild-type and Crhr2(-/-) mice.
• In vitro studies using CRHR2-overexpressing colonic epithelial cells to assess proliferation, migration, and wound healing.

Main Results:

• CRHR2 antagonism worsened colitis, delayed healing, and reduced epithelial proliferation.
• Crhr2(-/-) mice exhibited increased mortality during the healing phase.
• CRHR2-overexpressing cells demonstrated enhanced proliferation, migration, and wound healing, particularly with urocortin 2 and IL-6 treatment.

Conclusions:

• Selective CRHR2 activation promotes colonic mucosal repair by stimulating proliferative and migratory responses.
• CRHR2 signaling is crucial for effective epithelial restoration after colitis.
• Targeting CRHR2 represents a potential therapeutic strategy for enhancing mucosal healing in inflammatory bowel diseases.