DCAF1 regulates Treg senescence via the ROS axis during immunological aging

Area of Science:

• Immunology
• Cellular Biology
• Aging Research

Background:

• Immunological aging is characterized by chronic inflammation and T cell dysfunction.
• Regulatory T cells (Tregs) are crucial for immune homeostasis, but their aging process and functional decline remain poorly understood.
• Lack of specific markers hinders the study of Treg aging.

Purpose of the Study:

• To investigate the aging process and functional changes in Tregs compared to conventional T cells (Tconv).
• To identify key molecular mechanisms regulating Treg aging.
• To explore therapeutic strategies for rejuvenating aged Tregs.

Main Methods:

• Comparative analysis of young and aged Tregs and Tconv cells using cellular, molecular, and bioinformatic approaches.
• Assessment of Treg suppressive function in inflammatory bowel disease and irradiation-induced aging models.
• Investigation of the role of DDB1- and CUL4-associated factor 1 (DCAF1), glutathione-S-transferase P (GSTP1), and reactive oxygen species (ROS) in Treg aging.

Main Results:

• Tregs exhibit more severe senescence than Tconv cells during aging.
• Aged Tregs show reduced suppressive capacity and impaired ability to prevent Tconv cell aging.
• DCAF1 is downregulated in aged Tregs and plays a critical role in restraining Treg aging.
• The DCAF1/GSTP1/ROS pathway significantly influences Treg senescence and function.
• Intervention in GSTP1 and ROS pathways restores aged Treg proliferation and function.

Conclusions:

• Treg senescence is a critical driver of immunological aging and age-related diseases.
• The DCAF1/GSTP1/ROS axis is a key regulator of Treg aging.
• Targeting this pathway offers a promising therapeutic avenue for mitigating age-related immune dysfunction.