Ang1 and Ang4 differentially affect colitis and carcinogenesis in an AOM-DSS mouse model

Area of Science:

• Gastroenterology
• Oncology
• Immunology

Background:

• Angiogenin-1 (Ang1) and angiogenin-4 (Ang4) are ribonucleases with angiogenic and antimicrobial roles.
• Their involvement in chronic colitis and colitis-associated cancer remains unstudied.

Purpose of the Study:

• To investigate the roles of Ang1 and Ang4 in a mouse model of colitis-associated cancer.

Main Methods:

• Wild-type and Ang1-knockout mice were subjected to azoxymethane and dextran sodium sulfate to induce colitis and cancer.
• Disease activity, colonoscopy, and histopathology were assessed.
• mRNA levels of Ang1, Ang4, and inflammatory cytokines were analyzed via RT-PCR.

Main Results:

• Ang1-knockout mice showed more severe colitis but significantly fewer tumors compared to wild-type mice.
• Colitis severity correlated with Ang1 levels.
• Ang4 was upregulated during colitis and cancer, with lower levels in Ang1-knockout mice.

Conclusions:

• Ang1 deficiency exacerbates colitis but protects against tumor development.
• Ang1 and Ang4 play critical regulatory roles in chronic colitis and associated cancer.
• Ang1 and Ang4 represent potential therapeutic targets for these conditions.