Journal
MOLECULAR ENDOCRINOLOGY
Volume 28, Issue 9, Pages 1408-1422Publisher
OXFORD UNIV PRESS INC
DOI: 10.1210/me.2014-1074
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Funding
- Eunice Kennedy Shriver National Institute of Child Health and Human Development/National Institutes of Health [U54 HD055787, R21 HD078983]
- National Institutes of Health Predoctoral Traineeship in Endocrine, Developmental and Reproductive Toxicology [T32ES007326]
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Implantation is an essential process during establishment of pregnancy in mammals. It is initiated with the attachment of the blastocyst to a receptive uterine epithelium followed by its invasion into the stromal tissue. These events are profoundly regulated by the steroid hormones 17 beta-estradiol and progesterone. During the past several years, mouse models harboring conditional gene knockout mutations have become powerful tools for determining the functional roles of cellular factors involved in various aspects of implantation biology. Studies using these genetic models as well as primary cultures of human endometrial cells have established that the estrogen receptor alpha, the progesterone receptor, and their downstream target genes critically regulate uterine growth and differentiation, which in turn control embryo-endometrial interactions during early pregnancy. These studies have uncovered a diverse array of molecular cues, which are produced under the influence of estrogen receptor alpha and progesterone receptor and exchanged between the epithelial and stromal compartments of the uterus during the progressive phases of implantation. These paracrine signals are critical for acquisition of uterine receptivity and functional interactions with the embryo. This review highlights recent work describing paracrine mechanisms that govern steroid-regulated uterine epithelial-stromal dialogue during implantation and their roles in fertility and disease.
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