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. 1973 Jul;52(7):1601–1607. doi: 10.1172/JCI107337

C2 Deficiency DEVELOPMENT OF LUPUS ERYTHEMATOSUS

Noorbibi K Day 1,2, H Geiger 1,2, R McLean 1,2, A Michael 1,2, R A Good 1,2
PMCID: PMC302431  PMID: 4578155

Abstract

The study of serum from a patient with C2 deficiency is described. The patient had an episode of pneumococcal meningitis at 5 mo of age with seizures and transient hemiparesis and apparent purpuric skin lesions. He was first admitted to the University of Minnesota Hospitals at 10 yr of age following the discovery of proteinuria accidentally by his mother. Since then he has been admitted repeatedly to this hospital with numerous clinical findings including arthralgia, recurrent abdominal pain, proteinuria, membranous nephropathy, malar butterfly rash, seizures, personality aberrations, and recurrent fever. In June 1971, the patient developed positive DNA and DNP antibodies and positive LE cells. When the C profile was studied before and after recognition of lupus, C1q, C1s, and C4 dropped. C3 levels were elevated as were C5, C6, and C7, C3 proactivator had been reduced in the patient even before he developed lupus. Also because of a traumatic renal biopsy leading to a perirenal hematoma, he required surgery and a blood transfusion. 1 h after blood transfusion, a C2 titer of 23 hemolytic units was detected. Almost immediately levels of C3, C5, C6, and C7 dropped, C8 and C9 remained elevated. The addition of C2 from normal blood permitted dramatic activation of C3.

These findings support the view that the rare deficiency in production of C2 predisposes to serious susceptibility to infection, vascular and mesenchymal disease as well as to renal disease and a lupus syndrome.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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