IL-33: Friend or foe in transplantation?

Area of Science:

• Immunology
• Transplantation Biology
• Cytokine Signaling

Background:

• The Interleukin-33 (IL-33) system exhibits context-dependent effects in cardiac and lung diseases.
• IL-33 can mediate both protective and pro-inflammatory immune responses.

Purpose of the Study:

• To review preclinical mechanistic studies on the IL-33 system in heart and lung allograft rejection.
• To explore cellular sources and release pathways of IL-33 in transplantation.
• To analyze the role of IL-33 in cardiac vs. lung allograft outcomes.

Main Methods:

• Review of preclinical mechanistic studies on IL-33 in heart and lung transplantation models.
• Analysis of cellular sources and release mechanisms of IL-33.
• Evaluation of soluble IL-33 receptor as a biomarker.

Main Results:

• IL-33 promotes type-2 immunity, protecting cardiac allografts in preclinical models.
• Soluble IL-33 receptor identified as a biomarker for cardiac allograft rejection.
• IL-33's role in lung transplantation is complex, with preclinical models showing mixed results regarding tolerance and chronic rejection.

Conclusions:

• IL-33 plays a protective role in cardiac allografts via type-2 immune programs.
• The role of IL-33 in lung allograft rejection requires further investigation due to conflicting data.
• Future research should clarify IL-33's precise functions in heart and lung transplantation.