Molecular Human Reproduction, Vol. 5, No. 12, 1141-1149,
December 1999
© 1999 European Society of Human Reproduction and Embryology
Molecular events in the uterus |
Regulation of TNF-
mRNA expression in endometrial cells by TNF- and by oestrogen withdrawal
1 Department of Pathology, North Shore University Hospital, Biomedical Science Research Center, 350 Community Drive, Manhasset, NY 11030, 2 Department of OB/GYN, Hershey Medical Center, Hershey, PA 17033, USA, and 3 Department of OB/GYN, Klinikum Grosshadern, Ludwig-Maximilians University, Munich, Germany
Abstract
During each menstrual cycle, the human endometrium undergoes a series of orchestrated and well controlled changes in anticipation of the arrival of the blastocyst. In the absence of implantation, the endometrium is shed. The underlying basis of the menstrual bleeding is not clear, however, it seems to be related to steroid hormone withdrawal. We showed that tumour necrosis factor-
(TNF-) is released by human endometrium and that endometrial epithelial cells are a major source of TNF- mRNA and protein. We show here that TNF- mRNA shows a specific menstrual cycle-dependent expression. The expression of TNF- is mostly minimal throughout the proliferative, early and mid-secretory phases. Expression of TNF- mRNA, however, is increased in the human endometrium in the late secretory phase and during endometrial bleeding. Such a menstrual cycle-dependent expression suggests that specific signals regulate the expression of TNF- mRNA in the human endometrium. In vitro, the expression of TNF- mRNA in endometrial epithelial cells could be regulated by exogenous TNF-. This induced expression was both time- and dose-dependent. In vitro, the TNF- mRNA expression was not altered by oestrogen, progesterone, or both, in the endometrial epithelial cells under conditions that maintain the steroid hormone receptors. However, in vivo, oestrogen withdrawal led to an enhanced expression of TNF- in endometrial epithelial cells. These findings suggest that the up-regulation of TNF- in human endometrium in the late secretory phase may be related to the falling serum oestrogen concentration at the end of the menstrual cycle as well as the potentiating effect of released TNF- on its own mRNA expression.
endometrium/oestrogen withdrawal/TNF-/TNF- mRNA expression
Notes
4 To whom correspondence should be addressed
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