Inhibition of DJ-1 protects from lupus onset and severity.

The DJ-1 protein, known as an oxidative stress sensor, plays an important role in immunological processes. Using DJ-1 gene knock-out mice, we identified DJ-1 as a positive regulator in systemic lupus erythematosus (SLE). DJ-1 deficiency significantly alleviated skin lesion, splenomegaly, lymphadenopathy, while reducing multiple autoantibodies and immunoglobulin levels. Moreover, DJ-1 deficiency provided protection against renal hypertrophy and decreased glomerular deposition of immunoglobulin, ultimately leading to reduced albuminuria and SLE activity. These findings demonstrate that DJ-1 expression critically influences the progression of lupus-like disease.