Detection of specific antibodies using MPT83-MPT63 fusion protein in patients with destructive pulmonary tuberculosis

Abstract

Introduction. The development of effective test systems for tuberculosis (TB) diagnosis and the study of factors influencing their sensitivity and specificity constitute urgent tasks given the unstable epidemiological situation with TB in Ukraine and the world. The study aimed to determine the clinical and laboratory features of pulmonary TB that may affect the sensitivity of IgG TB antibody detection in human serum by the immuno-enzyme test system “IB-Chem Anti-Mycobacterium tuberculosis”, which was developed at the Palladin Institute of Biochemistry of the NAS of Ukraine and uses recombinant fusion protein MPT83-MPT63 as an antigen. Methods. Sera of 62 patients with chemoresistant pulmonary TB were tested for TB antibodies using an indirect enzyme-linked immunosorbent assay. Dependence of the obtained results on clinical symptoms and signs of pulmonary TB, the frequency of different types of antibiotic resistance, cellular and biochemical parameters of blood were analysed. Results. The sensitivity of the immuno-enzyme test system “IB-Chem Anti-Mycobacterium tuberculosis” for detecting human IgG TB antibodies using recombinant fusion protein MPT83-MPT63 was found to constitute 71.0%; it reached 81.3% in patients with destructive pulmonary TB. Conclusion. The developed test system should primarily be used for the TB diagnosis in patients with destructive changes in the lungs where the diagnostic efficiency of this test system reaches high indicators.