Exogenous oxidative stress suppresses IL-33 -driven proliferation programming in group 2 innate lymphoid cells

Area of Science:

• Immunology
• Cell Biology
• Pathophysiology

Background:

• Conventional antioxidant therapy has failed to effectively treat asthma, indicating complex roles of oxidative stress in airway inflammation.
• Group 2 innate lymphoid cells (ILC2s) are key mediators in early airway inflammation, proliferating in response to alarmins.
• Endogenous reactive oxygen species (ROS) are crucial for IL-33-induced ILC2 function, but the impact of exogenous oxidative stress on ILC2s remains unclear.

Purpose of the Study:

• To investigate the role of exogenous oxidative stress in regulating ILC2 functions and airway inflammation.
• To determine the mechanistic basis by which exogenous oxidative stress affects ILC2s and their inflammatory responses.

Main Methods:

• Administration of a ROS-generating reagent to induce exogenous oxidative stress in mouse models.
• Adoptive transfer of ILC2s into ILC2-deficient hosts to assess the impact of oxidative stress on cell accumulation and function.
• Analysis of ILC2 proliferation, effector molecule expression, and inflammatory cell recruitment (e.g., eosinophils).

Main Results:

• Exogenous oxidative stress alleviated IL-33-triggered ILC2 responses and inflammation in both airway and liver models.
• Oxidative stress impaired IL-33-mediated ILC2 accumulation and subsequent eosinophil recruitment in adoptive transfer experiments.
• Mechanistically, exogenous oxidative stress suppressed ILC2 proliferation while preserving effector molecule expression, leading to reduced ILC2 numbers and overall response.

Conclusions:

• Exogenous oxidative stress suppresses the proliferation of ILC2s, thereby mitigating IL-33-induced inflammation.
• Therapeutic induction of oxidative stress presents a potential novel strategy for alleviating ILC2-mediated inflammation in airways and other organs.