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Deficiency of the 9th component of complement (C9) in a patient with systemic lupus erythematosus
1First Department of Internal Medicine, Yokohama City University School of Medicine, Japan.
The Journal of Rheumatology
|April 1, 1989
Insights
This study reports the first case of systemic lupus erythematosus (SLE) linked to a deficiency in the 9th complement component (C9). This finding suggests a potential role for C9 in SLE pathogenesis.
Area of Science:
- Immunology
- Complement System Biology
Background:
- Systemic lupus erythematosus (SLE) is a chronic autoimmune disease.
- The complement system, a crucial part of innate immunity, plays a role in SLE pathogenesis.
- Deficiencies in complement components can increase susceptibility to autoimmune disorders.
Observation:
- The study details the first documented case of SLE in a patient with C9 deficiency.
- The patient exhibited low serum total hemolytic complement (CH50) and absent C9.
- The patient's sister, despite normal C9 levels, also had an autoimmune disorder.
Findings:
- Confirmed C9 deficiency in a patient diagnosed with SLE.
- Demonstrated low CH50 levels correlating with C9 absence.
- Identified a familial link to autoimmune disorders, even with normal C9 levels.
Implications:
- Suggests a potential role for the 9th complement component (C9) in the development or manifestation of SLE.
- Highlights the importance of complement system evaluation in autoimmune diseases.
- Warrants further investigation into the specific mechanisms linking C9 deficiency and autoimmunity.
Abstract:
We describe the first case of systemic lupus erythematosus (SLE) showing the 9th component of complement (C9) deficiency. In the serum of this patient, a low level of serum total hemolytic complement (CH50) and the absence of C9 was demonstrated. The patient's sister, with normal level of C9, was also found to have an autoimmune disorder.