gms | German Medical Science

102. Jahrestagung der DOG

Deutsche Ophthalmologische Gesellschaft e. V.

23. bis 26.09.2004, Berlin

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Expression of EphrinB2 and EphB4 in a mouse model of oxygen-induced retinopathy

Meeting Abstract

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  • corresponding author C. Ehlken - Universitäts-Augenklinik Freiburg, Freiburg
  • G. Martin - Universitäts-Augenklinik Freiburg, Freiburg
  • L. L. Hansen - Universitäts-Augenklinik Freiburg, Freiburg
  • H. T. Agostini - Universitäts-Augenklinik Freiburg, Freiburg

Evidenzbasierte Medizin - Anspruch und Wirklichkeit. 102. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft. Berlin, 23.-26.09.2004. Düsseldorf, Köln: German Medical Science; 2004. Doc04dogDO.03.03

The electronic version of this article is the complete one and can be found online at: http://www.egms.de/en/meetings/dog2004/04dog020.shtml

Published: September 22, 2004

© 2004 Ehlken et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by-nc-nd/3.0/deed.en). You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.

Outline

Text

Objective

The transmembrane ligand EphrinB2 and its membrane-bound receptor tyrosine-kinase, EphB4, are specifically expressed on arterial and venous endothelial cells, respectively. They are probably involved in angiogenesis. The purpose of this study was to examine the expression of EphrinB2, EphB4 and of vascular endothelial growth factor (VEGF) in a murine model of oxygen-induced retinal neovascularization.

Methods

Mice were kept at 75% oxygen between postnatal day 7 and 12. The return to room air induced a relative hypoxia of the retina and mice developed retinal neovascularization within five days. Within this time, retinae were collected to isolate RNA, and EphrinB2, EphB4 and VEGF expression were measured using quantitative RT-PCR.

Results

VEGF showed a statistically significant increase of expression during the first 12 hours of relative hypoxia. Compared to VEGF, the upregulation of EphrinB2 started with a delay and reached a maximum (factor 2,5) at 48 hours. Subsequently, both factors displayed a slow decrease of transcription over the following days. EphB4 expression, however, did not change statistically significantly during the whole time.

Conclusions

In the mouse, EphrinB2 expression is statistically significantly increased during development of angioproliferative retinal disease while expression of its receptor EphB4 is constant. VEGF is expressed earlier than EphrinB2 pointing to VEGF being involved in the regulation of EphrinB2-gene expression.