Chronic Immune Activation in Systemic Lupus Erythematosus and the Autoimmune PTPN22 Trp620 Risk Allele Drive the Expansion of FOXP3+ Regulatory T Cells and PD-1 Expression
In systemic lupus erythematosus (SLE), perturbed immunoregulation underpins a pathogenic imbalance between regulatory and effector CD4+ T-cell activity.However, to date, the characterization of the CD4+ regulatory T cell (Treg) compartment in SLE has yielded conflicting results.Here we show that patients have an increased frequency of CD4+FOXP3+ ce