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Subtotal C4 deficiency and SLE-like disease.

M Irestedt, A Svensson, T Månsson

Acta Dermato-Venereologica

|January 1, 1986

Summary

A patient with long-term arthritis and skin issues had extremely low complement C4 levels. This deficiency, identified during a flare-up, persisted after remission, supporting a diagnosis of inherited complement C4 deficiency.

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Area of Science:

Immunology
Rheumatology
Dermatology

Background:

Complement C4 is a crucial component of the immune system's classical pathway.
Deficiencies in complement proteins can predispose individuals to autoimmune diseases and infections.
Arthritis and skin manifestations are common in various autoimmune and autoinflammatory conditions.

Observation:

A 65-year-old male presented with a multi-year history of relapsing arthritis and widespread skin lesions.
The patient experienced painful ulcerations on his toes and fingers.
Extremely low complement C4 levels were detected during a disease exacerbation.

Findings:

The patient exhibited significantly reduced complement C4 values.
These low C4 levels were consistently observed even after the patient achieved remission.
The clinical presentation, including arthritis and skin lesions, correlated with the persistent C4 deficiency.

Implications:

The findings suggest a potential link between inherited C4 deficiency and the patient's chronic autoimmune symptoms.
Diagnosing complement deficiencies is vital for understanding disease pathogenesis and guiding treatment.
Further investigation into complement system function may reveal new therapeutic targets for autoimmune and inflammatory diseases.

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