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Updated: Jun 20, 2026
Oxygen-Induced Retinopathy Model for Ischemic Retinal Diseases in Rodents
Published on: September 16, 2020
Therapeutic interference with EphrinB2 signalling inhibits oxygen-induced angioproliferative retinopathy
Christoph Ehlken1, Gottfried Martin, Clemens Lange
1University Eye Hospital, Freiburg, Germany.
Purpose:
To investigate whether EphrinB2 (EfnB2) or EphB4 influence retinal angiogenesis under physiological or pathological conditions.
Methods:
Using the mouse model of oxygen-induced proliferative retinopathy (OIR), the expression of EfnB2, EphB4, vascular endothelial growth factor (VEGF), VEGFR1 and VEGFR2 was quantified by quantitative polymerase chain reaction (qPCR) and localized in EfnB2- and EphB4-lacZ mice. Angioproliferative retinopathy was manipulated by intravitreal injection of dimeric EfnB2 and monomeric or dimeric EphB4.
Results:
Dimeric EphB4 (EphB4-Fc) and EfnB2 (EfnB2-Fc) enhanced hypoxia-induced angioproliferative retinopathy but not physiological angiogenesis. Monomeric EphB4 (sEphB4) reduced angiogenesis. The messenger RNA (mRNA) level of EfnB2 increased significantly in the hyperoxic phase (P7-P12), while EphB4, VEGF, VEGFR1 and VEGFR2 showed a significant - up to fivefold - increased expression at P14, the start of morphologically visible vasoproliferation caused by relative hypoxia.
Conclusion:
The ephrin/Eph system is involved in angioproliferative retinopathy. Stimulation of EphB4 and EfnB2 signalling using EfnB2-Fc and EphB4-Fc, respectively, enhanced hypoxia-induced angiogenesis. In contrast, sEphB4 inhibited hypoxia-induced angiogenesis. Therefore, angiogenesis is enhanced by signalling through both EphB4 (forward) and EfnB2 (reverse). The distinction in the expression kinetics of EphB4 and EfnB2 indicates that they govern two different signalling pathways and are regulated in diverse ways. sEphB4 might be a useful drug for antiangiogenic therapy.
Insights
EphrinB2 and EphB4 signaling pathways influence retinal angiogenesis, with dimeric forms enhancing hypoxia-induced neovascularization. Monomeric EphB4 shows potential as an anti-angiogenic therapy for retinopathy.
Area of Science:
- Ophthalmology
- Molecular Biology
- Vascular Biology
Background:
- Retinal angiogenesis is crucial for vision but can be dysregulated in diseases like proliferative retinopathy.
- The ephrin/Eph signaling system plays a role in cell communication and tissue development, including vascularization.
Purpose of the Study:
- To investigate the role of EphrinB2 (EfnB2) and EphB4 in retinal angiogenesis.
- To determine if these molecules influence physiological and pathological neovascularization.
Main Methods:
- Utilized a mouse model of oxygen-induced retinopathy (OIR).
- Quantified gene expression of EfnB2, EphB4, VEGF, VEGFR1, and VEGFR2 using qPCR.
- Localized expression in EfnB2- and EphB4-lacZ mice.
- Manipulated angioproliferative retinopathy via intravitreal injections of EfnB2 and EphB4 variants.
Main Results:
- Dimeric EfnB2 and EphB4 enhanced hypoxia-induced angioproliferative retinopathy, but not physiological angiogenesis.
- Monomeric EphB4 inhibited angiogenesis.
- EfnB2 mRNA increased during hyperoxia, while EphB4, VEGF, VEGFR1, and VEGFR2 expression rose during relative hypoxia.
Conclusions:
- The ephrin/Eph system is implicated in angioproliferative retinopathy.
- Stimulating EfnB2 and EphB4 signaling enhances hypoxia-induced angiogenesis.
- Monomeric EphB4 demonstrates potential as an anti-angiogenic therapeutic agent for retinopathy.
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