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Updated: Feb 9, 2026
A Mouse Model of Retinal Ischemia-Reperfusion Injury Through Elevation of Intraocular Pressure
Published on: July 14, 2016
Low-dose minocycline mediated neuroprotection on retinal ischemia-reperfusion injury of mice
Ruojing Huang1, Shaomin Liang1, Lyujie Fang1
1Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Guangzhou, China.
Purpose:
The aim of this study was to investigate the effect of minocycline (MC) on the survival of retinal ganglion cells (RGCs) in an ischemic-reperfusion (I/R) injury model of retinal degeneration.
Methods:
Retinal I/R injury was induced in the left eye of mice for 60 min by maintaining intraocular pressure at 90 mmHg. Low- or high-dose MC (20 or 100 mg/kg, respectively) was administered by intravenous injection at 5 min after the retinal ischemic insult and then administered once daily until the mice were euthanized. RGCs and microglial cells were counted using immunofluorescence staining. Functional changes in the RGCs were evaluated using electroretinography. The visual function was assessed using an optokinetic test.
Results:
The data demonstrated that the effect of MC was dose dependent. Low-dose MC showed protective effects, with reduced RGC loss and microglial activation, while the high-dose MC showed damage effects, with more RGC loss and microglial activation when compared with the vehicle group. The electroretinography and optokinetic test results were consistent with the morphologic observations.
Conclusions:
These data suggested that appropriate concentrations of MC can protect the retina against retinal ischemic-reperfusion injury, while excessive MC has detrimental effects.
Insights
Minocycline (MC) shows a dose-dependent effect on retinal ganglion cells (RGCs) following ischemic-reperfusion injury. Low-dose MC protects RGCs, while high-dose MC exacerbates damage.
Area of Science:
- Ophthalmology
- Neuroscience
- Pharmacology
Background:
- Retinal ganglion cells (RGCs) are crucial for vision.
- Retinal ischemic-reperfusion (I/R) injury causes significant RGC loss and degeneration.
- Minocycline (MC) is an antibiotic with known anti-inflammatory and neuroprotective properties.
Purpose of the Study:
- To investigate the neuroprotective effects of minocycline (MC) on retinal ganglion cells (RGCs) in a mouse model of retinal ischemic-reperfusion (I/R) injury.
- To determine the dose-dependent effects of MC on RGC survival and function.
- To evaluate the impact of MC on microglial activation in the context of retinal I/R injury.
Main Methods:
- Retinal I/R injury was induced in mice by elevating intraocular pressure.
- Mice received low-dose (20 mg/kg) or high-dose (100 mg/kg) MC intravenously, followed by daily administration.
- RGC survival, microglial activation, and visual function were assessed using immunofluorescence, electroretinography, and optokinetic tests.
Main Results:
- Minocycline's effect was dose-dependent.
- Low-dose MC significantly reduced RGC loss and microglial activation compared to the vehicle group.
- High-dose MC worsened RGC loss and microglial activation, indicating detrimental effects.
Conclusions:
- Appropriate concentrations of minocycline can protect the retina from ischemic-reperfusion injury.
- Excessive doses of minocycline may have harmful effects on retinal cells.
- MC's therapeutic potential in retinal degeneration warrants further investigation with careful dose optimization.
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