TY - JOUR
T1 - Antiprogestin-releasing intrauterine devices
T2 - a novel approach to endometrial contraception
AU - Nayak, Nihar R.
AU - Slayden, Ov D.
AU - Mah, Kunie
AU - Chwalisz, Kristof
AU - Brenner, Robert M.
PY - 2007/6
Y1 - 2007/6
N2 - Intrauterine devices (IUDs) that release progestins are highly effective contraceptives, but they induce breakthrough bleeding that some women find unacceptable. Because progesterone (P) antagonists [antiprogestins (APs)] are known to suppress the endometrium, induce amenorrhea and inhibit fertility, AP-releasing IUDs (AP-IUDs) may provide an effective contraceptive that also controls endometrial bleeding. Here, we assessed the effects of empty (blank) vs. AP-IUDs (ZK 230 211) on bleeding patterns and endometrial growth in ovariectomized, artificially cycled macaques. The AP-IUDs (but not the blank controls) induced extended, frank menstruation when inserted during the late luteal phase, an indication of local AP action. Over time, endometrial glandular and arterial proliferation were inhibited, steroid receptors were elevated, spiral arteries showed degenerative changes, P withdrawal bleeding was prevented, and estradiol (E2)-dependent proliferation was suppressed by the AP-IUDs. In sum, AP-IUDs suppressed the effects of P on endometrial progestational development and blocked the effects of E2 on endometrial proliferation, as previously shown for systemic treatment with APs. Therefore, AP IUDs may provide novel contraceptive devices with minimal breakthrough bleeding.
AB - Intrauterine devices (IUDs) that release progestins are highly effective contraceptives, but they induce breakthrough bleeding that some women find unacceptable. Because progesterone (P) antagonists [antiprogestins (APs)] are known to suppress the endometrium, induce amenorrhea and inhibit fertility, AP-releasing IUDs (AP-IUDs) may provide an effective contraceptive that also controls endometrial bleeding. Here, we assessed the effects of empty (blank) vs. AP-IUDs (ZK 230 211) on bleeding patterns and endometrial growth in ovariectomized, artificially cycled macaques. The AP-IUDs (but not the blank controls) induced extended, frank menstruation when inserted during the late luteal phase, an indication of local AP action. Over time, endometrial glandular and arterial proliferation were inhibited, steroid receptors were elevated, spiral arteries showed degenerative changes, P withdrawal bleeding was prevented, and estradiol (E2)-dependent proliferation was suppressed by the AP-IUDs. In sum, AP-IUDs suppressed the effects of P on endometrial progestational development and blocked the effects of E2 on endometrial proliferation, as previously shown for systemic treatment with APs. Therefore, AP IUDs may provide novel contraceptive devices with minimal breakthrough bleeding.
KW - Antiprogestins
KW - Endometrial changes
KW - Macaque monkeys
KW - Progesterone withdrawal
KW - Uterine bleeding
UR - http://www.scopus.com/inward/record.url?scp=34248644857&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34248644857&partnerID=8YFLogxK
U2 - 10.1016/j.contraception.2007.01.024
DO - 10.1016/j.contraception.2007.01.024
M3 - Review article
C2 - 17531599
AN - SCOPUS:34248644857
SN - 0010-7824
VL - 75
SP - S104-S111
JO - Contraception
JF - Contraception
IS - 6 SUPPL.
ER -