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BMC Ophthalmology
Published in: BMC Ophthalmology 1/2019

Open Access 01-12-2019 | Intense Pulsed Light | Research article

Protective effects of hydrogen gas in a rat model of branch retinal vein occlusion via decreasing VEGF-α expression

Authors: Pan Long, Weiming Yan, Mengshan He, Qianli Zhang, Zhe Wang, Manhong Li, Junhui Xue, Tao Chen, Jing An, Zuoming Zhang

Published in: BMC Ophthalmology | Issue 1/2019

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Abstract

Background

Oxidative stress (OS) is an essential factor in the pathogenesis of branch retinal vein occlusion (BRVO). Studies have demonstrated the role of hydrogen gas in the regulation of OS. This study was designed to evaluate the efficacy of hydrogen gas on the BRVO rat model.

Methods

Twenty-four BRVO rats were randomly divided into two groups: the hydrogen gas (H) group (42% H2, 21% O2, 37% N2) and the model (M) group (21% O2, 79% N2). Rats in the H group inhaled hydrogen gas for 8 h every day up to 30 d post-occlusion. Twelve age-matched healthy rats served as the control (C) group. Retinal function and morphology were detected at 1, 7, 14 and 30 d post-occlusion. Furthermore, the expression of vascular endothelial growth factor (VEGF-α) was detected by immunofluorescent staining.

Results

Full-field electroretinography (ffERG) revealed that the amplitude of the b-wave (dark-adaptation 3.0 response), the amplitude of the OPs2 wave and the light-adapted flicker response in the H group were all higher than those in the M group at 7 d post-occlusion (all p < 0.05). The reopen time of occlusive retinal vessels in the H group was 2.235 ± 1.128 d, which was shorter than that in the M group (4.234 ± 2.236 d, p < 0.05). The rats in the H group had a thinner IPL + GCL + NFL and an increased total retina compared with those in the M group at 3 d post-occlusion (p < 0.05), while the rats in the H group had a thicker INL, IPL + GCL + NFL and total retina compared with those at 7, 14 and 30 d post-occlusion (p < 0.05). Moreover, the flow velocity of ear vein blood was increased in the H group compared with that in the M group (p < 0.05). The expression of VEGF-α in the H group was dramatically decreased compared with that in the M group at 1, 7 and 14 d post-occlusion (p < 0.05), while the expression kept in similar level at 30 d post-occlusion (p > 0.05).

Conclusions

Our findings demonstrate that inhalation of hydrogen gas could alleviate retinal oedema, shorten reopen time and improve retinal function, and the potential mechanism might be related to a decrease in VEGF-α expression.
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Metadata
Title
Protective effects of hydrogen gas in a rat model of branch retinal vein occlusion via decreasing VEGF-α expression
Authors
Pan Long
Weiming Yan
Mengshan He
Qianli Zhang
Zhe Wang
Manhong Li
Junhui Xue
Tao Chen
Jing An
Zuoming Zhang
Publication date
01-12-2019
Publisher
BioMed Central
Published in
BMC Ophthalmology / Issue 1/2019
Electronic ISSN: 1471-2415
DOI
https://doi.org/10.1186/s12886-019-1105-2

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