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A Mouse Model of Retinal Ischemia-Reperfusion Injury Through Elevation of Intraocular Pressure
Published on: July 14, 2016
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COX-2 inhibition improves retinal function in rats' ischemic eyes.
Anat Fleischman1, Yoram Oron, Orna Geyer
11 Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel-Aviv University , Tel-Aviv, Israel .
Summary
Selective cyclooxygenase-2 (COX-2) inhibition improved functional recovery after retinal ischemia in rats, suggesting a potential therapeutic role for COX-2 inhibitors in treating ischemic retinal injury.
Area of Science:
- Ophthalmology
- Neuroscience
- Pharmacology
Background:
- Retinal ischemia is a critical factor in vision loss.
- Cyclooxygenase (COX) enzymes play a complex role in ischemic damage.
- Understanding COX-1 and COX-2 roles is crucial for neuroprotective strategies.
Purpose of the Study:
- To investigate the specific roles of COX-1 and COX-2 in functional damage following retinal ischemia.
- To evaluate the neuroprotective potential of selective COX inhibitors.
Main Methods:
- Retinal ischemia induced by elevated intraocular pressure in rats.
- Functional assessment using white flash electroretinogram (ERG) on multiple post-ischemia days.
- Analysis of b-wave amplitude, implicit time, and oscillatory potentials (OPs).
- Western blot analysis for COX-2 and HSP70i expression.
Main Results:
- Ischemia led to decreased OPs, reduced b-wave amplitude, and prolonged b-wave implicit time.
- Increased expression of COX-2 and heat shock protein 70 kDa 1 (HSP70i) observed post-ischemia.
- Selective COX-2 inhibition improved ERG parameters and enhanced HSP70i induction.
- COX-1 inhibition or nonselective inhibition did not impact retinal function or protein expression.
Conclusions:
- COX-2 mediates a portion of the functional damage in ischemic retinas, potentially via inhibition of HSP70i induction.
- Selective COX-2 inhibitors show promise for treating ischemic retinal conditions.
