Abstract：
:Alpha 1-antitrypsin (A1AT) is the most abundant proteinase inhibitor in plasma and the main inhibitor of Proteinase 3, the target antigen of antineutrophil cytoplasmic antibodies (ANCAs) that predominant in Wegeners' granulomatosis. Α1AT deficiency correlated with ANCA-associated vasculitis. This study explores the trypsin inhibitory capacity (TIC), specific activity, and phenotypic deficiency of Α1AT in Wegener's granulomatosis. Twenty-seven WG patients were studied. ANCA was tested by IIF and ELISA. Serum a1-anti-trypsin levels were quantified in WG patients and healthy controls by immunoturbidimetric assay. Serum TIC was assessed by the enzymatic colorimetric assay. Phenotypes of A1AT were detected by Isoelectric Focusing. A1AT concentration was equivalent in patients and controls; however, serum TIC (P = 0.001) and specific activity of A1AT (P = 0.001) were dramatically lower in WG patients. Five patients had deficient phenotypes of A1AT: MZ (n = 3), MS (n = 1) and SS (n = 1). This was correlated with an increase in the prevalence of deficient phenotypes of A1AT in WG (P = 0.01). Trypsin inhibitory capacity and specific activity of A1AT were decreased in WG patients and may be involve in disease pathogenesis and can worsen the clinical manifestations. This A1AT deficiency probably resulted from oxidative inactivation and/or enzymatic degradation of A1AT. This could result in localized deficiency of A1AT in vessel wall interfaces and lead to severe disease.
journal_name
Rheumatol Intjournal_title
Rheumatology internationalauthors
Mota A,Sahebghadam Lotfi A,Jamshidi AR,Najavand Sdoi
10.1007/s00296-013-2745-9subject
Has Abstractpub_date
2014-04-01 00:00:00pages
553-8issue
4eissn
0172-8172issn
1437-160Xjournal_volume
34pub_type
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