Increased TTS expression in patients with rheumatoid arthritis

Area of Science:

• Immunology
• Molecular Biology
• Rheumatology

Background:

• Immune system activation plays a role in rheumatoid arthritis (RA) pathogenesis.
• Imbalances in specific enzymes like indoleamine 2,3-dioxygenase (IDO) and tryptophanyl-tRNA synthetase (TTS) are implicated in autoimmune diseases.

Purpose of the Study:

• To investigate the differential expression of IDO and TTS in patients with RA compared to healthy controls.
• To explore the correlation between TTS expression and disease activity markers in RA.

Main Methods:

• Real-time quantitative polymerase chain reaction (RT-qPCR) to measure mRNA expression levels.
• Flow cytometry to analyze protein expression on peripheral blood mononuclear cells (PBMCs), specifically within CD3(+) T cells.
• Analysis of 49 RA patients and 49 healthy controls.

Main Results:

• TTS mRNA expression was significantly higher in RA patients than in healthy controls.
• Elevated TTS expression correlated with erythrocyte sedimentation rate (ESR), a marker of inflammation (r = 0.424, P < 0.01).
• Increased TTS expression was predominantly observed in CD3(+) T cells within the RA cohort.

Conclusions:

• The study identifies an upregulation of TTS in RA patients, suggesting its involvement in the disease.
• Increased TTS in T cells may contribute to the survival of autoreactive T cells, a key factor in RA.
• Measuring TTS expression could enhance understanding of RA progression and potentially identify therapeutic targets.