Evidence for an increased release of proteolytic activity by the eutopic endometrial tissue in women with endometriosis and for involvement of matrix metalloproteinase-9

T Collette, C Bellehumeur, R Kats, R Maheux, J Mailloux, M Villeneuve, A Akoum
Human Reproduction · 2004 · vol. 19(6) , pp. 1257–1264 · doi:10.1093/humrep/deh290 · PMID:15105396 · W2076658041
article OA: bronze CC0 ⤵ 64 in-corpus citations
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This study found that eutopic endometrial tissue from women with endometriosis exhibits increased proteolytic activity, specifically elevated matrix metalloproteinase-9 secretion and an imbalance with its inhibitor TIMP-1, compared to women without endometriosis.

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Abstract

BACKGROUND: For the implantation of endometrium in ectopic locations, remodelling of the extracellular matrix (ECM) is necessary. Many studies have shown an increased expression of various proteases in the ectopic endometrium of women with endometriosis. Few, however, have addressed possible changes in protease expression in the eutopic endometrium. METHODS AND RESULTS: Herein, we reveal an increased release of proteolytic activity by the eutopic endometrium of women with endometriosis compared with normal women (P < 0.01). Using zymography and western blotting, we identified matrix metalloproteinase (MMP)-2 and MMP-9 in the culture medium, and further found that MMP-9 secretion, as assessed by zymography and enzyme-linked immunosorbent assay (ELISA), was elevated in women with endometriosis compared with normal women (P < 0.05). No statistically significant difference in MMP-2 secretion between women with and without endometriosis was noted. However, a significant difference in the levels of the tissue inhibitor of metalloproteinases (TIMP)-1, a known MMP-9 inhibitor, was found (P < 0.05). CONCLUSION: The endometriosis-associated increase in proteolysis and imbalance between the secretion of MMP-9 and that of its natural inhibitor, TIMP-1, revealed in the culture medium of endometrial tissue may reflect in vivo the enhanced capacity of this tissue to break down the ECM in host tissues, thereby favouring its ectopic implantation and development.

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Condition tags

mesh:D004715endometriosis

MeSH descriptors

Endometriosis Endometrium Matrix Metalloproteinase 9 Peptide Hydrolases Adult Blotting, Western Case-Control Studies Culture Media Culture Media Endometriosis Endometriosis Endometrium Enzyme-Linked Immunosorbent Assay Female Humans Matrix Metalloproteinase 2 Matrix Metalloproteinase 2 Matrix Metalloproteinase 9 Matrix Metalloproteinase Inhibitors Peptide Hydrolases

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References (44)

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