PMID: 8602120Jan 1, 1996Paper

A phorbol ester that activates protein kinase C mimics the action of estradiol or epidermal growth factor for initiating embryo implantation in the delayed implanting hypophysectomized rat

Life Sciences
D C Johnson

Abstract

In rodents an action of estrogen is required for the initiation of implantation of the blastocyst into the endometrium of a progesterone-primed uterus. Thus removal of endogenous estrogen, either directly by ovariectomy or indirectly by hypophysectomy, prevents implantation in the pregnant rat. In the present study, delayed implanting hypophysectomized progesterone-primed rats were used to test the efficacy of cyclic adenosine 3',5'-monophosphate (cAMP), epidermal growth factor (EGF) and insulin-like growth factor-I (IGF-I), which are agents that have been shown to mimic some uterine actions of estradiol, to initiate implantation. In confirmation of previous studies, EGF injected into the uterine lumen plus intravenously was effective at initiating implantation in all animals. IGF-I showed no such activity in this model system. Cyclic AMP, increased via direct activation of adenylyl cyclase by forskolin, or administration of sodium dibutyryl cAMP, did not initiate implantation. However, a ligand for protein kinase C (PKC), phorbol 12-myristate 13-acetate, was effective in augmenting the action of intrauterine EGF, or forskolin, for initiation of implantation. A phorbol ester that does not activate PKC was ineffective. The resul...Continue Reading

References

Sep 18, 1992·Cell·W J Tang, A G Gilman
Mar 5, 1990·Molecular and Cellular Endocrinology·C Sumida, J R Pasqualini
Jan 1, 1973·Vitamins and Hormones·A Psychoyos
Oct 1, 1983·Biology of Reproduction·P J Stewart, R A Webster
Jan 1, 1995·Prostaglandins, Leukotrienes, and Essential Fatty Acids·D C Johnson, S Chatterjee
Nov 1, 1993·Molecular and Cellular Biochemistry·S L PelechJ S Sanghera
Nov 1, 1993·Journal of Reproduction and Fertility·D C Johnson, S Chatterjee

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Citations

Feb 14, 1998·IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society·R S MacLeod, D H Brooks
Aug 29, 2006·Endocrinology·Monique H A KesterTheo J Visser

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