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A Journal on Internal Medicine
Indexed/Abstracted in: BIOSIS Previews, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,6
Panminerva Medica 2000 March;42(1):17-21
Low serum alpha-1-antitrypsin specific activity in monoclonal gammopathies
Jelic-Ivanovic Z., Stankovic B., Topic A., Spasojevic-Kalimanovska V., Spasic S.
From the Department of Medical Biochemistry University School of Pharmacy Belgrade, Serbia Republic of Yugoslavia
Background. Serum α1-antitrypsin (α1AT) antigen concentration is elevated in malignancies as the result of acute phase reaction. In the present study, we examined whether the α1AT elevation in monoclonal gammopathies was accompanied by an adequate increase of its functional activity.
Methods. In this case-control study, serum α1AT concentration was measured in 187 ambulatory patients with monoclonal gammopathies and 320 healthy blood donors matched according to sex and age. The α1AT antigen concentration was assayed by immunonephelometry, whereas its functional activity was measured as trypsin inhibitory capacity (TIC). The specific α1AT inhibitory activity (SIA) was calculated, defined as the TIC/antigen concentration ratio.
Results. The α1AT antigen concentrations obtained in the patients’ samples were very significantly higher as compared with the corresponding values in the control group (mean±SD =134±41.9% of normal, p<0.001). However, the TIC values were higher in the patients than in the healthy controls only by 4% (104±23.8%, p<0.05). The specific α1AT activity was very significantly lower in the patients, as compared with the controls (p<0.001), indicating that serum α1AT in monoclonal gammopathies was partially inactive.
Conclusions. As poor correlation between the TIC values and the antigen concentrations was obtained in the patient group as well as the decreased specific α1AT activities, the TIC values in patients with monoclonal gammopathies should be interpreted with caution.