Correlation between orbital immune cell subsets and clinical activity in thyroid eye disease

Area of Science:

• Ophthalmology
• Immunology
• Endocrinology

Background:

• Thyroid eye disease (TED) is an autoimmune condition affecting the orbits.
• Understanding the role of orbital immune cells in TED pathogenesis is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the correlation between specific orbital immune cell subsets and the clinical activity of thyroid eye disease (TED).

Main Methods:

• Orbital samples from 29 TED patients (active and inactive) and 12 healthy controls were analyzed using flow cytometry.
• Quantified various immune cell populations including T cells (CD3+, CD4+, CD8+), B cells, NK cells, and NKT cells.
• Correlated immune cell counts with the clinical activity score (CAS) for TED.

Main Results:

• Active TED patients exhibited significantly higher numbers of orbital lymphocytes, CD3+ T cells, CD4+ T cells, CD8+ T cells, NK cells, and NKT cells compared to inactive patients and controls.
• CD4+ T cells, CD8+ T cells, NK cells, and NKT cells were identified as independent predictors of TED clinical activity after adjusting for age and disease duration.

Conclusions:

• Elevated levels of specific immune cells, particularly CD4+ T cells, CD8+ T cells, NK cells, and NKT cells, are present in the orbits of TED patients.
• These immune cell subsets are significantly associated with the clinical activity score in TED, suggesting their involvement in disease pathogenesis.