Molecular Human Reproduction, Vol. 5, No. 4, 365-371,
April 1999
© 1999 European Society of Human Reproduction and Embryology
Progesterone analogues similarly modulate endometrial matrix metalloproteinase-1 and matrix metalloproteinase-3 and their inhibitor in a model for long-term contraceptive effects
Prince Henry's Institute of Medical Research, PO Box 5152, Clayton, Victoria 3168, Australia
Matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs) are involved in normal menstruation, while MMP-1 and MMP-3 production by human endometrial stromal cells (HESCs) is repressed in vitro by progesterone. We postulated that the repression by synthetic progestins of MMP production from HESCs may not be fully maintained in the long term, and that this may account for the disturbed uterine bleeding patterns in women using long-acting progestins. In this study, a long-term HESC culture model was established to compare the effects of natural progesterone and a number of synthetic analogues (ORG2058, medroxyprogesterone acetate, norethindrone acetate, levonorgestrel and drospirenone) on the production by these cells of MMP-1 and MMP-3 and TIMP-1. Zymographic and enzyme-linked immunosorbent analysis of culture medium after 2 weeks showed that both natural progesterone and all of the synthetic progestins tested maintained a significant inhibition of MMP-1 and MMP-3 production. Production of mRNA for MMP-1 and MMP-3 was also suppressed by all progestins, while TIMP production was increased. Thus, menstrual bleeding disturbances which occur during the use of synthetic progestins is not likely to result directly from changes in the effect of long-term progestin exposure on MMP-1 or MMP-3 or TIMP-1 production by HESCs.
endometrium/human/MMP/progestins/TIMP
1 To whom correspondence should be addressed
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