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Effects of doxycycline on serum and endometrial levels of MMP-2, MMP-9 and TIMP-1 in women using a levonorgestrel-releasing subcutaneous implant.

Author(s): Zhao S, Choksuchat C, Zhao Y, Ballagh SA, Kovalevsky GA, Archer DF

Affiliation(s): Department of Obstetrics and Gynecology, CONRAD Clinical Research Center, Jones Institute for Reproductive Medicine, Eastern Virginia Medical School, Norfolk, VA 23507, USA. zhaos@evms.edu

Publication date & source: 2009-06, Contraception., 79(6):469-78. Epub 2009 Feb 7.

Publication type: Randomized Controlled Trial; Research Support, N.I.H., Extramural

BACKGROUND: Endometrial spotting and/or bleeding (ESB) occurs in levonorgestrel subcutaneous implant (LNG SI) users. Matrix metalloproteinases (MMPs) may play a role in ESB. STUDY DESIGN: Women between 18 and 40 years with regular menstrual cycles had a baseline evaluation followed by LNG SI insertion and randomization to doxycycline (DOX; 20 mg) or placebo (PL) twice a day. MMP-2, MMP-9 and tissue inhibitor of MMP-1 (TIMP-1) in serum and the endometrium were estimated at baseline and at 1, 3 and 6 months after insertion. RESULTS: LNG increased serum MMP-9, while DOX decreased MMP-9 levels compared to PL after 1 month (p<.05). DOX decreased endometrial MMP-9 at 1 and 6 months compared to baseline and PL (p<.05). DOX increased endometrial TIMP-1 at 6 months compared with baseline and PL (p<.05). MMP-2 levels were unchanged. CONCLUSION: LNG SI increased serum MMP-9 and TIMP-1 levels, while DOX decreased both serum and endometrial MMP-9 levels.

Page last updated: 2009-10-20

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