Pathogenesis of Childhood Onset Systemic Lupus Erythematosus

Systemic lupus erythematosus (SLE) is a chronic, systemic autoimmune disease characterized by immune dysregulation and inflammation affecting multiple organs and tissues. Its pathogenesis is complex and multifactorial, involving interactions among genetic susceptibility, environmental triggers, and abnormalities in innate and adaptive immune responses that contribute to autoantibody production and tissue damage. Understanding these pathogenic mechanisms is essential for elucidating disease progression, clinical manifestations, and outcomes, particularly in pediatric patients. This review aimed to summarize the existing literature on the pathogenesis of childhood-onset systemic lupus erythematosus (cSLE). A literature search was conducted using PubMed, Embase, the Cochrane Library, and Google Scholar, and relevant publications were synthesized through a narrative review. The findings indicated that cSLE develops through interactions among genetic predisposition, environmental influences, and immune system dysfunction. Key pathogenic mechanisms include the loss of immune tolerance, dysregulated apoptosis, impaired clearance of apoptotic cellular debris, and abnormal activation of innate and adaptive immune cells, particularly T and B lymphocytes. These abnormalities promote the production of autoantibodies and the formation of immune complexes, which contribute to complement activation, inflammatory cytokine release, and subsequent tissue and organ injury. Childhood-onset SLE frequently exhibits a more severe clinical phenotype and greater disease activity than adult-onset SLE, with genetic factors playing a particularly prominent role in early disease development. Genetic susceptibility, together with environmental triggers, contributes to persistent immune activation and the dysregulation of proinflammatory signaling pathways, including type I interferon responses. These interconnected processes sustain systemic inflammation and promote damage to target organs. In conclusion, the pathogenesis of cSLE involves complex interactions among genetic susceptibility, defective immune tolerance, impaired apoptotic cell clearance, complement dysregulation, cytokine-mediated inflammation, and autoantibody production. A comprehensive understanding of these mechanisms may facilitate the identification of molecular biomarkers and the development of more targeted therapeutic strategies for pediatric patients with SLE.