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Alpha 1-antitrypsin genetic polymorphism in ANCA-positive systemic vasculitis
V L Esnault1, A Testa, M Audrain
1Laboratoire d'Immunologie, Hotel Dieu, Nantes, France.
Kidney International
|June 1, 1993
Summary
Alpha 1-antitrypsin (alpha 1-AT) deficiency is linked to anti-proteinase 3 (PR3) vasculitis. This suggests a role for alpha 1-AT deficiency in the development of antineutrophil cytoplasm antibodies (ANCA) against PR3.
Area of Science:
- Immunology
- Genetics
- Rheumatology
Background:
- Alpha 1-antitrypsin (alpha 1-AT) inhibits proteinase 3 (PR3), a key antigen in Wegener's granulomatosis.
- Alpha 1-AT deficiency arises from genetic variations, leading to different protease inhibitor (PI) phenotypes.
Purpose of the Study:
- To investigate the association between alpha 1-AT deficiency and anti-PR3 positive vasculitis.
- To explore the potential role of alpha 1-AT deficiency in the pathogenesis of ANCA-associated vasculitis.
Main Methods:
- Analysis of protease inhibitor (PI) phenotypes in patients with Wegener's granulomatosis.
- Correlation of PI phenotypes with the presence of anti-PR3 antibodies.
Main Results:
- Severely and medium deficient PI phenotypes were associated with anti-PR3 positive systemic vasculitis.
- A subgroup of Wegener's granulomatosis patients showed this association.
Conclusions:
- Alpha 1-antitrypsin deficiency may play a pathogenetic role in anti-PR3 vasculitis.
- This deficiency is linked to the occurrence of ANCA with specificity for PR3 in certain patients.