Molecular Human Reproduction, Vol. 8, No. 7, 597-605,
July 2002
© 2002 European Society of Human Reproduction and Embryology
Reproductive endocrinology |
Steroids mediate the expression of cytoplasmic and membrane-linked components in human myometrial cells
Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, UK
It is well known that the smooth muscle of the human myometrium is a target for the steroid hormones progesterone (P4) and estrogen. Progesterone is believed to participate in the maintenance of pregnancy, while estrogen is possibly involved in the process of parturition by promoting cervical dilatation. We examined the combined effects of P4 and 17ß-estradiol (E2) on components of signalling pathways in human myometrial cells in vitro by immunoblotting. Long-term treatment of myometrial cells with a series of concentrations of P4 and E2 in combination caused a change in the phosphorylation status of p42/44 mitogen-activated protein kinase and of c-Jun N-terminal kinase (SAPK/JNK). P4 and E2 caused a decrease in protein expression of Gq
, Gz, Gi1/2 and, to a lesser extent, G0. The two steroids caused a decrease in the expression of the two small GS isoforms. Cyclo-oxygenase-2 expression was increased by 2.5-fold after steroid treatment, while proliferating cell nuclear antigen expression levels remained unchanged. These observations show that the combination of P4 and E2 influences intracellular and membrane-bound components of signal transduction pathways in human myometrial cells. The implications of the two steroid hormones on intracellular signalling pathways in the human myometrium merits further investigation.
G-proteins/kinases/myometrium/steroids
1 To whom correspondence should be addressed. E-mail: szervou{at}cell.bio.warwick.ac.uk
* These authors have contributed equally to this work
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