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Human Reproduction, Vol 13, 1210-1217, Copyright © 1998 by Oxford University Press

ARTICLES

Progestin receptor isoforms and prostaglandin dehydrogenase in the endometrium of women using a levonorgestrel-releasing intrauterine system

HO Critchley, H Wang, RW Kelly, AE Gebbie and AF Glasier
Department of Obstetrics and Gynaecology, University of Edinburgh, Centre for Reproductive Biology, UK.

This study has examined endometrial tissue in 14 normal women prior to insertion of a levonorgestrel-releasing intrauterine system (LNG-IUS) and thereafter longitudinally for up to 12 months post-insertion. The specific endpoints examined by immunohistochemistry were progesterone receptor (PR) subtypes A + B, oestrogen receptor (ER) and prostaglandin dehydrogenase (PGDH). Two antiprogesterone receptor antibodies, one specific to PR(B) subtype and the other to PR subtype A + B, were employed to examine the localization of both PR isoforms. The activity of PGDH, a progesterone dependent enzyme, was also measured. ER and PR(A+B) and PR subtype B were significantly down-regulated in glands and stroma in the presence of continuous intrauterine LNG delivery. There was an apparent increase in PR(A) immunoreactivity in endometrial glands between 6 and 12 months post-insertion. Consistent with down- regulation of both isoforms of PR was reduced glandular PGDH immunostaining following LNG-IUS insertion, and PGDH activity (as measured by metabolism of excess substrate in vitro). Furthermore, PGDH activity, known to be localized in the glands, significantly increased (P < 0.05) at 12 months post-insertion, coinciding with the observed increase in glandular PR(A+B) immunoreactivity at this time. Since the LNG-IUS suppresses the PR(B) so strongly, PR(A) is likely to be the subtype that mediates long term LNG action in the endometrium. PR(B) is the more suppressed of the two subtypes, and only PR(A) rises along with PGDH activity. Alterations to normal endometrial morphology and function, e.g. perturbation of normal sex steroid receptor expression, following exposure to high concentrations of local LNG, may play a role in the aetiology of bleeding disorders associated with the LNG-IUS. Further elucidation of local uterine mediators involved in the mechanism of bleeding problems is required.
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