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To examine the changes in matrix metalloproteinase-2(MMP-2)and-9(MMP-9)in the development and progression of endometriosis,real time quantitative polymerase chain reaction,enzyme-linked immunoabsorbent assay and gelatin zymography were employed to determine the mRNA and protein levels and activities of MMP-2 and MMP-9 from the first day to the 21st day after the induction in mice with induced endometriosis(experimental group)and sham-operated animals (controls).The results showed that the mRNA and protein levels and activities of the MMP-2 and MMP-9 were significantly increased on the first day after the induction and the level of MMP-2 stayed at a level higher than that in the control group.MMP-9 had two or three peaks during the 21 days,taking place at day 1,4 and 15.It is concluded that the changes in the MMP-2 and MMP-9 might be involved in pathogenesis of endometriosis.