Exp Clin Endocrinol Diabetes 2004; 112(4): 208-214
DOI: 10.1055/s-2004-817940
Article

J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York

Differential Regulation of ANG2 and VEGF-A in Human Granulosa Lutein Cells by Choriogonadotropin

D. Pietrowski1 , C. Keck1
  • 1Department of Obstetrics and Gynecology, University of Freiburg, Freiburg, Germany
Further Information

Publication History

Received: April 17, 2002 First decision: November 24, 2002

Accepted: October 6, 2003

Publication Date:
04 May 2004 (online)

Abstract

The growth and development of the corpus luteum after rupture of the follicle is a highly regulated process characterised by a rapid vascularization of the follicle surrounding granulosa cells. Vascularization is regulated by a large number of growth factors and cytokines whereas members of the angiopoietin family and VEGF-A are reported to play a principal role. The gonadotropic hormones luteinizing hormone and choriogonadotropin are reported to be essential for corpus luteum formation. In this study we investigated by RT PCR if the growth factors PGF, PDGF-A, PDGF-B, VEGF-A, VEGF-B, VEGF-C, VEGF-D, ANG1, ANG2, ANG3 and ANG4 are expressed in granulosa cells. We show the expression of VEGF-A, VEGF-B, PDGF-A, ANG1 and ANG2 in granulosa cells. Using RT-PCR and Real-Time PCR we demonstrate that angiopoietin 2 is downregulated in human granulosa cells in vitro after choriogonadotropin treatment whereas the expression of angiopoietin 1 is not significantly altered. The expression of VEGF on the RNA- and on the protein level was determined. It was shown that in granulosa cells VEGF is upregulated after choriogonadotropin treatment on the RNA level and that increasing concentrations of choriogonadotropin from 0 to 10 U/ml leads to an increasing amount of VEGF in the cell culture supernatants. The amount of VEGF in the supernatants reaches a plateau at 0.5 U/ml and is increased only slightly and not significantly after treatment of the cells with 10 U/ml choriogonadotropin compared to 0.5 U/ml.

In total these findings suggests that in granulosa cells the mRNA of various growth factors is detectable by RT-PCR and that VEGF-A and ANG2 is regulated by the gonadotropic hormone choriogonadotropin. These findings may add impact on the hypothesis of choriogonadotropin as a novel angiogenic factor.

References

Dr. Detlef Pietrowski

Universitäts Frauenklinik Freiburg

Hugstetter Straße 55

79106 Freiburg

Germany

Phone: + 49(0)7612703188

Fax: + 49 (0) 76 12 70 30 37

Email: [email protected]