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Anti‐C1q autoantibodies in murine lupus nephritis

Autoantibodies against C1q can be found in the circulation of patients with several autoimmune diseases including systemic lupus erythematosus (SLE). In SLE there is an association between the occurrence of these antibodies and renal involvement. How anti‐C1q autoantibodies contribute to renal disease is currently unknown. Cohorts of MRL‐lpr mice, which are known to develop age‐dependent SLE‐like disease, were used to study the relationship between levels of anti‐C1q autoantibodies and renal disease. We collected serum, urine and renal tissue and analysed autoantibodies, complement levels and renal deposition as well as renal function. At 2 months of age all mice already had elevated levels of anti‐C1q autoantibodies, and elution of kidneys revealed the presence of these antibodies in renal immune deposits in MRL‐lpr mice and not in control MRL+/+ mice. In conclusion, anti‐C1q antibodies are already present in serum and immune deposits of the kidney early in life and therefore can play a role in nephritis during experimental SLE‐like disease in mice.