c-Rel is Required for the Induction of pTregs in the Eye but Not in the Gut Mucosa

Downregulation of circETS1 disrupts Th17/Treg homeostasis by inhibiting FOXP3 transcription: A new potential biomarker in systemic lupus erythematosus

Systemic lupus erythematosus (SLE) is an autoimmune disease associated with an imbalance of T helper 17 (Th17) to regulatory T cells (Tregs). However, the underlying mechanism remains unclear. Increasing evidence suggests that circular RNAs play a crucial role in SLE. Although circETS1 was discovered 30 years ago, detailed exploration of its functions remains limited. In this study, we measured the expression levels of circETS1 in peripheral blood mononuclear cells (PBMCs) and CD4+ T cells of patients with SLE by quantitative polymerase chain reaction. The impact of circETS1 expression on the Th17/Treg balance and underlying mechanism were evaluated using double-luciferase reporter, gain-/loss-of-function, and rescue assays. Receiver operating characteristic (ROC) curve analysis was conducted to assess the diagnostic value of circETS1. Both circETS1 and FOXP3 expression were downregulated in the PBMCs and CD4+ T cells of patients with SLE (n = 28) compared with those in the cells of healthy controls (n = 20). Mechanistically, we found that circETS1 can bind directly to the microRNA miR-1205, acting as a sponge to upregulate the transcription of FOXP3, thereby maintaining the Th17/Treg balance. Notably, ROC analysis showed that the expression level of circETS1 in PBMCs had an area under the curve of 0.873 (95% confidence interval: 0.771-0.976; p < .001) for diagnosing SLE, with a sensitivity of 80.00% and a specificity of 89.29%. Finally, we found negative correlations between the level of circETS1 in PBMCs and disease severity (according to the Systemic Lupus Erythematosus Disease Activity Index) in patients with SLE (r = -0.7712, 95% CI: -0.8910 to -0.5509; p < .001). The imbalance in Th17/Treg cells in SLE may be attributed, in part, to the circETS1/miR-1205/FOXP3 pathway. CircETS1 has potential to serve as a valuable biomarker for the diagnosis and evaluation of SLE.

Relationship of ocular presentation in granulomatosis with polyangiitis to autoantibodies and disease activity

OBJECTIVE

The aim of this study was to assess disease characteristics, autoantibodies, and disease activity in granulomatosis with polyangiitis (GPA) patients with ocular manifestations.

METHODS

The cohort included 46 GPA patients visiting the ophthalmology clinic. Ocular manifestations were recorded, clinical and slit lamp examinations were performed. The Birmingham Vasculitis Activity Score (BVAS) was recorded. Laboratory investigations and the antineutrophil cytoplasmic antibody (ANCA) assay were performed.

RESULTS

Median age of the 22 male and 24 female patients was 44.5 (32-63) years, median disease duration 6.5 (1-16) years. Ocular manifestations were present in all patients: 12 (26.1%) had proptosis; 40 (87%) had scleritis/episcleritis, with perforation in 3 (6.5%); 33 (71.7%) had keratoconjunctivitis (KC), with acute infiltrative stromal keratitis in 11, peripheral ulcerative keratitis in 15, and sclerosing keratitis in 11 patients. Uveitis was present in 11 (23.9%) and retinal changes including vasculitis, exudates, and hemorrhage were present in 7 (15.2%). Blurred vision was present in 43 (93.5%) patients and 2 (4.3%) had vision loss. Glaucoma was present in 4 (8.7%) and hypotony in 2 (4.3%) patients. Involvement was bilateral in 32 (69.6%) patients. Rheumatoid factor (RF) was positive in 56.5% and significantly associated with uveitis (p = 0.04), while antinuclear antibody (ANA) was positive in 45.7% and significantly associated with KC (p = 0.04). BVAS tended to be higher in patients with uveitis (p = 0.49).

CONCLUSION

Ocular involvement must be considered in all GPA patients and referral to an experienced ophthalmologist is mandatory for proper management and improved outcome of such a rare systemic disease. ANA and RF positivity may raise suspicion for KC or uveitis, respectively. There was a remarkable association between uveitis and disease activity.