Leukaemia inhibitory factor and the regulation of pre-implantation development of the mammalian embryo
- 1 October 1994
- journal article
- review article
- Published by Wiley in Molecular Reproduction and Development
- Vol. 39 (2), 233-238
- https://doi.org/10.1002/mrd.1080390217
Abstract
This paper reviews the evidence that certain growth factors, particularily leukaemia inhibitory factor (LIF), play a crucial role in regulating the development of the pre‐implantation mammalian embryo. LIF was originally implicated in regulating the early development of the mouse embryo because it inhibited the differentiation of embryonic stem (ES) cells, pluripotential cells derived from the inner cell mass of the blastocyst. Subsequent studies on its role in vivo revealed, surprisingly, that it is essential for the growth rather than the differentiation of the blastocyst. In vivo, overtly normal blastocysts can be produced in a LIF‐deficient environment that are capable of forming viable fertile adults. However, in the absence of LIF, they fail to implant and enter into a state resembling that exhibited by blastocysts undergoing delayed implantation, which is characterized by a cessation of cell proliferation. This failure to implant occurs because the principle sites of LIF production are the endometrial glands of the uterus. These synthesize and secrete LIF at implantation, with LIF synthesis essential for implantation. Preliminary evidence indicates that LIF synthesis is required both by the uterus for it to undergo decidualization and by the blastocyst for implantation. These data indicate that the maternal environment plays a crucial role in the development and growth of the pre‐implantation embryo, by supplying factors that regulate these processes in the embryo.Keywords
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