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Captopril improves retinal neovascularization via endothelin-1
1Georgetown University Children's Medical Center, Department of Pediatrics, Division of Neonatology, 3800 Reservoir Road NW, Washington, DC 20007, USA.
Investigative Ophthalmology & Visual Science
|June 30, 2001
Summary
Captopril significantly reduces retinal neovascularization in a mouse model of oxygen-induced retinopathy (OIR). This study also found that captopril modulates endothelin-1 (ET-1) expression during OIR development.
Area of Science:
- Ophthalmology
- Pharmacology
- Developmental Biology
Background:
- Oxygen-induced retinopathy (OIR) is a significant cause of vision impairment.
- Neovascularization is a key pathological feature of OIR.
- Endothelin-1 (ET-1) is implicated in the pathogenesis of OIR.
Purpose of the Study:
- To investigate the therapeutic effect of captopril, an angiotensin-converting enzyme inhibitor, on OIR in a mouse model.
- To assess the impact of captopril on ET-1 expression in the context of OIR.
Main Methods:
- Oxygen-induced retinopathy (OIR) was induced in C57BL6 mice.
- Captopril was administered subcutaneously from postnatal day 7 for 5 days.
- Retinopathy was evaluated using a scoring system and quantification of neovascular nuclei.
- Retinal ET-1 expression was measured via reverse transcriptase polymerase chain reaction (RT-PCR).
Main Results:
- Captopril treatment significantly reduced retinopathy scores and the number of extra-retinal neovascular nuclei.
- Retinal ET-1 expression increased progressively from postnatal day 7 to 17.
- Hyperoxia exposure elevated ET-1 levels, while captopril treatment suppressed ET-1 expression at postnatal day 17.
Conclusions:
- Captopril demonstrates a protective effect against retinal neovascularization in a mouse model of OIR.
- ET-1 expression is dynamically regulated during OIR and is modulated by captopril treatment.