The aim of this study was to determine the frequency of bacterial and viral etiology arthritic pathogens DNA detection and to establish the matrix metalloproteinases MMR-1, MMR-3, MMR-9 normalized genes expression levels in synovial fluid. The study group consisted of 69 patients with reactive knee arthropathy. The molecular genetic studies made it possible to divide all patients into groups: bacterial infection factor was detected in 21 patients (30.88 ± 4.90 % of cases), viral – in 23 patients (64.70 ± 5.98 % of cases), in 25 patients (36.76 ± 5.21 % of cases) studied pathogens DNA was not detected. To determine the levels of normalized expression of MMP-1, MMP-3 and MMP-9 genes, the original oligonucleotide primers and molecular probes were selected, the composition of the reaction mixture and the temperature profile of amplification were improved. HGUS gene was used as house-keeping gene to calculate normalized expression. Statistically significant differences in the studied genes normalized expression levels depending on the etiological infection factor were established: the synovial fluid bacterial infectious factor contributes the MMP-9 increasing expression, while the viral knee joint lesion is associated with an increasing of MMP-1 gene expression.
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