Abstract
The aim of this study was to determine reference values of matrix metalloproteinases (MMPs) MMP-1, MMP-2, MMP-9 and tissue inhibitor of matrix metalloproteinases-1 (TIMP-1) in the amniotic fluid at the first stage of labor in physiological pregnancy. Eighty nine women at the first stage of term labor have been examined. Samples of amniotic fluid were taken at the first period of labor by vaginal amniotomy. Concentrations of MMP-1, MMP-2, MMP-9, and TIMP-1 have been investigated in amniotic fluid samples by ELISA kits. The following normal concentration ranges for MMP-1, MMP-2, MMP-9, TIMP-1, and ratios of concentrations of MMPs and TIMP-1 (MMP-1/TIMP-1, MMP-2/TIMP-1, MMP-9/TIMP-1) have been determined for amniotic fluid samples obtained during the first period of labor in physiological pregnancy. These included: MMP-1: 5.1–16.8 pg/mg of protein; MMP-2: 238.3–374.1 pg/mg of protein; MMP-9: 66.1–113.3 pg/mg of protein, TIMP-1: 4.7–13.6 pg/mg of protein, MMP-1/TIMP-1 ratio: 0.1–2.2, MMP-2/TIMP-1 ratio: 19.9–55.7; MMP-9/TIMP-1 ratio: 4.2–17.2.
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