An Elevated IL10 mRNA Combined with Lower TNFA mRNA Level in Active Rheumatoid Arthritis Peripheral Blood

Area of Science:

• Immunology
• Molecular Biology
• Rheumatology

Background:

• Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by systemic inflammation.
• The T helper (Th) 1/Th17/T regulatory (Treg) axis plays a crucial role in RA pathogenesis.
• Understanding gene expression patterns in RA is vital for developing targeted therapies.

Purpose of the Study:

• To investigate the mRNA expression levels of key pro-inflammatory and immunoregulatory genes in the peripheral blood of RA patients.
• To correlate gene expression patterns with disease activity in RA.
• To elucidate the systemic imbalance in the Th1/Th17/Treg axis in RA.

Main Methods:

• Isolation of total RNA from peripheral blood samples of RA patients and healthy controls.
• Quantification of mRNA levels for eight target genes (TNFA, IL6, IL12B, IL23A, IL18, FOXP3, TGFB1, IL10) using real-time quantitative PCR with TaqMan assays.
• Analysis of gene expression correlations and differences based on disease activity.

Main Results:

• Downregulation of IL6, FOXP3, and IL12B mRNA was observed in RA patients compared to controls.
• Upregulation of IL23A mRNA was noted in RA patients.
• Active RA cases showed significantly higher IL10 and lower FOXP3 mRNA expression.
• A strong positive correlation between FOXP3 and TNFA, and a moderate correlation between FOXP3 and TGFB1 were found.
• Distinct gene expression profiles (IL10, TNFA, IL12B) could differentiate RA disease activity cohorts.

Conclusions:

• The study demonstrates a systemic imbalance in the Th1/Th17/Treg axis in RA patients.
• Elevated IL-10 and decreased TNFA mRNA levels in peripheral blood are associated with active RA.
• Gene expression profiling offers potential for classifying RA disease activity.