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Complete functional C1q deficiency associated with systemic lupus erythematosus (SLE)
M Kirschfink1, F Petry, K Khirwadkar
1Institute of Immunology, University of Heidelberg, Germany.
Clinical and Experimental Immunology
|November 1, 1993
Summary
A patient with Systemic Lupus Erythematosus (SLE) had a complete deficiency in the complement protein C1q. This hereditary defect caused immune system dysfunction, impacting C1q
Area of Science:
- Immunology
- Complement System Biology
- Molecular Genetics
Background:
- Systemic Lupus Erythematosus (SLE) is an autoimmune disease often associated with complement system deficiencies.
- The complement component C1q plays a crucial role in immune complex clearance and innate immunity.
- Hereditary deficiencies in complement proteins can predispose individuals to autoimmune conditions like SLE.
Observation:
- A patient with SLE presented with a complete functional deficiency of C1q.
- Reduced C1 activity in parents suggested a hereditary basis for the C1q deficiency.
- The patient's C1q was haemolytically inactive, failed to bind immune complexes, and was not recognized by monocyte receptors.
Findings:
- The patient's serum C1 activity was restored upon addition of purified C1q.
- Gel-filtration and ultracentrifugation revealed an abnormal C1q molecule (approx. 150 kD), suggesting a structural defect.
- Southern blot analysis showed no major genetic alterations in the C1q molecule's coding regions.
Implications:
- This case highlights the critical role of functional C1q in preventing SLE.
- The findings suggest a molecular defect rather than a complete absence of C1q genetic information.
- Understanding C1q deficiency mechanisms can inform therapeutic strategies for SLE and related autoimmune disorders.