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This study analysed the expression and activation of proline-rich tyrosine kinase 2 (PYK2) in peripheral blood mononuclear cells (PBMCs) from 36 systemic lupus erythematosus (SLE) patients and explored whether activation of PYK2 correlates with disease activity or organ damage in SLE. Samples from 19 patients with rheumatoid arthritis (RA) and 15 healthy individuals were included as controls. There was a significant increase in both total PYK2 protein and its activated/phosphorylated form in PBMCs from patients with SLE, particularly in those with the complication of World Health Organization class IV lupus nephritis. There was a clear correlation between the activation of PYK2 and the level of serum complement, but no relationship was found between the activation of PYK2 and SLE Disease Activity Index (SLEDAI). As previous studies have shown that PYK2 provides important signals during the activation of lymphocytes, PYK2 could be a major contributor to the complex autoimmune pathogenesis of SLE.

journal of international medical research

Expression and Activation of Proline-Rich Tyrosine Kinase 2 (PYK2) in Peripheral Blood Mononuclear Cells from Patients with Systemic Lupus Erythematosus