The LIF receptor antagonist PEGLA is effectively delivered to the uterine endometrium and blocks LIF activity in cynomolgus monkeys
Details
Publication Year 2013-06,Volume 87,Issue #6,Page 813-823
Journal Title
CONTRACEPTION
Publication Type
Journal Article
Abstract
Background: Leukemia inhibitory factor (LIP) is a cytokine with an essential role in the preparation of the endometrium for implantation. Previous studies demonstrated that PEGLA, a LIP receptor antagonist (LA) conjugated with polyethylene glycol (PEG), effectively prevents implantation in mice, identifying PEGLA as a potential contraceptive for women. Study Design: Adult female cynomolgus macaques were used to determine the optimal route of administration to deliver PEGLA to the uterine endometrium. Endometrial explants were used to examine the ability of PEGLA to block LIP action at endometrial cells. Results: Both intramuscular and subcutaneous PEGLA administration resulted in peak serum PEGLA 24 h after administration; serum PEGLA was detectable throughout the 144-h sampling period. In contrast, serum PEGLA was near or below the limit of detection after vaginal administration. After intramuscular administration, PEGLA was localized to both luminal and glandular epithelial cells of the uterine endometrium, and PEGLA was measurable in endometrial lysates. PEGLA administration reduced endometrial signal transducer and activator of transcription protein 3 (STAT3) phosphorylation in vivo and in vitro. PEGLA also blocked LlF's ability to elevate expression of cochlin, insulin-like growth factor-binding protein 3, vascular endothelial growth factor A, and cyclooxygenase-2 (also known as PTGS2) in endometrial explants in vitro. Conclusions: PEGLA was delivered to the non-human primate uterine endometrium with systemic administration, and PEGLA blocked LIP actions associated with implantation. Blocking LIP receptor activity with the antagonist PEGLA may prevent pregnancy in women and provide a novel alternative to currently-available hormonal and barrier contraceptives. (C) 2013 Elsevier Inc. All rights reserved.
Publisher
ELSEVIER SCIENCE INC
Keywords
LEUKEMIA-INHIBITORY FACTOR; HUMAN FALLOPIAN-TUBE; EMBRYO IMPLANTATION; BLASTOCYST IMPLANTATION; PREVENTS IMPLANTATION; INTERFERON ALPHA-2A; STAT3 ACTIVATION; INFERTILE WOMEN; EARLY-PREGNANCY; DRUG-DELIVERY
Research Division(s)
Cancer And Haematology
Terms of Use/Rights Notice
Copyright © 2013 Elsevier Inc. All rights reserved.


Creation Date: 2013-06-01 12:00:00
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