Sex Hormones Regulate T-Cell Responses Associated With Rheumatoid Arthritis.

Area of Science:

• Immunology
• Endocrinology
• Rheumatology

Background:

• Rheumatoid arthritis (RA) involves chronic synovial inflammation, T cell dysfunction, and immune imbalance.
• Regulatory T cells (Tregs) and Th2 cells are crucial for immune homeostasis but are impaired in RA.
• Women are more susceptible to RA, with pathogenesis linked to hormonal changes from menarche to menopause.

Purpose of the Study:

• To comprehensively review how sex hormone levels regulate T cell responses in RA.
• To elucidate signaling mechanisms by which declining postmenopausal hormones affect T cells in RA.
• To explore potential hormone-targeted therapies for RA progression.

Main Methods:

• Review of existing literature on RA pathogenesis, T cell subsets, and sex hormones.
• Analysis of molecular signaling pathways involved in T cell differentiation and homeostasis.
• Discussion of hormonal impact on T cell plasticity and function in premenopausal and postmenopausal women.

Main Results:

• Reduced or functionally impaired Tregs and Th2 cells contribute to Th1/Th2 and Th17/Treg imbalance in RA.
• CD8+ T cells are key mediators of synovial inflammation and autoantibody production in RA.
• Declining postmenopausal sex hormones promote aberrant T cell activation and effector functions, disrupting immune homeostasis.

Conclusions:

• Sex hormone levels significantly influence T cell responses and RA pathogenesis.
• Understanding hormone-mediated T cell regulation offers potential for novel RA therapeutic strategies.
• Targeting hormonal pathways may help limit RA progression and improve immune homeostasis.