IL-22, cell regeneration and autoimmunity.

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• Interleukin-22 (IL-22) is a cytokine with paradoxical pro-inflammatory and anti-inflammatory functions.
• Its anti-inflammatory roles include promoting cell regeneration, tissue remodeling, and maintaining gut microbiota balance.
• Conversely, IL-22 production by Th17 cells links it to pro-inflammatory responses.

Purpose of the Study:

• To review the regulation of IL-22 production.
• To explore the roles of Aryl hydrocarbon receptor (AhR) and IL-23 in IL-22 regulation.
• To highlight the potential of IL-22 in treating various human diseases.

Main Methods:

• This review synthesizes existing research on IL-22 biology.
• It focuses on the regulatory mechanisms involving transcription factors ROR-γt and AhR.
• The discussion includes the roles of Th17 cells and group 3 innate lymphoid cells (ILC3) as major IL-22 producers.

Main Results:

• IL-22 is produced by immune cells like Th17 cells and ILC3, but primarily acts on non-hematopoietic cells (e.g., hepatocytes, epithelial cells).
• The dual function of IL-22 is influenced by its association with other cytokines and transcription factors.
• AhR and IL-23 pathways significantly regulate IL-22 production.

Conclusions:

• A comprehensive understanding of IL-22 biology, particularly its regulation, is crucial.
• Targeting IL-22 pathways offers potential therapeutic strategies for inflammatory and regenerative medicine.
• Further research into IL-22's complex roles can lead to novel treatments for debilitating conditions.