Th22 cell accumulation is associated with colorectal cancer development

Area of Science:

• Immunology
• Oncology
• Molecular Biology

Background:

• Colorectal cancer (CRC) is a significant global health concern.
• The role of specific T helper cell subsets, like Th22 cells, and their associated cytokines in CRC pathogenesis remains incompletely understood.

Purpose of the Study:

• To investigate the expression of Th22 cells and related cytokines in colorectal cancer (CRC) tissues.
• To elucidate the potential mechanism by which Th22 cells and Interleukin-22 (IL-22) influence CRC development.

Main Methods:

• Analysis of Th22 cell and cytokine expression in CRC and adjacent tissues using immunohistochemistry, flow cytometry, and RT-qPCR.
• In vitro studies involving co-culture of colon cancer cells with IL-22 and a STAT3 inhibitor.
• In vivo studies using a mouse model of CRC treated with IL-22 and a STAT3 inhibitor.

Main Results:

• Significantly higher percentages of Th22 cells were observed in CRC tumor tissues compared to paratumor tissues.
• Elevated mRNA expression of IL-22, aryl hydrocarbon receptor, CCL20, and CCL22 was detected in tumor tissues.
• IL-22 enhanced colon cancer cell proliferation and inhibited apoptosis in vitro, and promoted tumor growth in vivo, effects which were reversed by a STAT3 inhibitor.

Conclusions:

• Th22 cell accumulation in CRC tissues may be driven by the tumor microenvironment's chemotactic signals.
• IL-22 appears to play a crucial role in CRC development, likely mediated through the activation of the STAT3 signaling pathway.