Human colon carcinogenesis is associated with increased interleukin-17-driven inflammatory responses

Area of Science:

• Oncology
• Immunology
• Gastroenterology

Background:

• Inflammation is a known contributor to colorectal cancer development.
• Interleukin-17 (IL-17), specifically IL-17A, plays a critical role in colon carcinogenesis in mouse models.
• Limited research exists on IL-17A's role in human colon tissues.

Purpose of the Study:

• To assess IL-17-driven inflammatory responses in human colon tissues.
• To investigate the levels of IL-17A and its receptor (IL-17RA) in colon adenocarcinomas, adenomas, ulcerative colitis, and normal colon tissues.
• To identify molecular changes associated with IL-17 signaling in colorectal cancer.

Main Methods:

• Analysis of human colon tissues: 17 adenocarcinomas, 16 normal tissues, 10 ulcerative colitis biopsies, and 8 benign adenomas.
• Quantification of IL-17A and IL-17RA levels.
• Assessment of downstream inflammatory signaling pathways, including ERK, JNK, MMPs, Bcl-2 family proteins, cyclin D1, VEGF, and VEGFR.

Main Results:

• Human colon adenocarcinomas exhibited significantly higher IL-17A levels compared to adenomas, ulcerative colitis, and normal tissues.
• Elevated IL-17RA levels were observed in adenocarcinomas, followed by adenomas and ulcerative colitis.
• Increased IL-17A and IL-17RA correlated with enhanced inflammatory responses, including activation of ERK/JNK pathways, altered expression of MMPs, Bcl-2 family proteins, cyclin D1, and increased VEGF/VEGFR signaling associated with angiogenesis.

Conclusions:

• IL-17A and its signaling pathways are significantly implicated in human colorectal adenocarcinomas.
• The findings suggest IL-17 and its associated pathways are promising therapeutic targets for colorectal cancer prevention and treatment.
• Further drug development targeting IL-17 signaling could be beneficial for managing colorectal cancer.