Molecular Human Reproduction, Vol. 5, No. 11, 1055-1058,
November 1999
© 1999 European Society of Human Reproduction and Embryology
Regulation of implantation |
Effects of interleukin-6 (IL-6) on cytotrophoblastic cells
Department of Obstetrics and Gynaecology, Geneva University Hospital and WHO Collaborating Centre in Human Reproduction, University of Geneva, Switzerland
Abstract
Tumour invasion and trophoblastic invasion share the same biochemical mediators: the matrix metalloproteinases (MMP) and their inhibitors. In contrast to tumour invasion of a host tissue, trophoblastic invasion during implantation and placentation is stringently controlled both in tissue localization and developmental stage. The factors responsible for these important regulatory processes are unknown, but in-vitro studies point to endometrial cytokines and growth factors as possible candidates. Here we examined the possibility that interleukin-6 (IL-6), a trophoblastic and endometrial cytokine, represents such a regulatory factor. Purified first trimester cytotrophoblastic cells (CTB) were cultured for 4 days in presence or absence of increasing concentrations of IL-6. MMP-2 and MMP-9 bioactivity (zymography) and immunoactivity were measured in the culture supernatants together with total human chorionic gonadotrophin (HCG), fetal fibronectin (FFN) and leptin. IL-6 did not change the cytotrophoblastic secretion of FFN or total HCG. In contrast, this cytokine induced a dose-dependent stimulation of the leptin secretion and increased the activity, but not the immunoreactivity, of MMP-9 and MMP-2. These results indicate that IL-6 could be considered as an endometriotrophoblastic regulator of cytotrophoblastic gelatinases.
interleukin-6/leptin/MMP/trophoblastic invasion
Notes
1 To whom correspondence should be addressed at: Laboratoire d'Hormonologie Maternité, 1211 Geneva 14, Switzerland
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