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Establishment of an adult zebrafish model of retinal neurodegeneration induced by NMDA.

International journal of ophthalmology (2019-08-29)
Zhi-Wen Luo, Han-Tsing Wang, Ning Wang, Wei-Wei Sheng, Ming Jin, Ye Lu, Yi-Jiang Bai, Su-Qi Zou, Yu-Lian Pang, Hong Xu, Xu Zhang
ABSTRACT

To establish a model of retinal neurodegeneration induced by N-Methyl-D-aspartic acid (NMDA) in adult zebrafish. We compared the effects of three different NMDA delivery methods on retinal neurodegeneration in adult zebrafish: immersion (I.M.), intravitreal injection (I.V.), and intraperitoneal injection (I.P.), and examined retinal pathology and degeneration by hematoxylin and eosin and TUNEL staining in the treated zebrafish. Effects of the NMDA receptor antagonist MK-801 and the natural product resveratrol on NMDA-induced retinal neurodegeneration were also assessed. The thickened inner retina was seen in histology with 100 µmol/L NMDA by I.M. administration. Significant apoptosis in the retinal ganglion cell layer and retinal thickness reduction occurred in 0.5 mol/L NMDA I.P. administration group.Seizure-like behavioral changes, but no retinal histological alteration occurred in 16 mg/kg NMDA I.P. administration group. Resveratrol and MK-801 prevented NMDA-induced retinal neurodegeneration in the zebrafish. Among the three drug administration methods, I.V. injection of NMDA is the most suitable for establishment of an acute retinal damage model in zebrafish. I.M. with NMDA is likely the best for use as a chronic retinal damage model. I.P. treatment with NMDA causes brain damage. Resveratrol and MK801 may be a clinically valuable treatment for retinal neurodegeneration.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Glutaraldehyde solution, Grade I, 25% in H2O, specially purified for use as an electron microscopy fixative
Sigma-Aldrich
Resveratrol, ≥99% (HPLC)
Roche
In Situ Cell Death Detection Kit, POD
Sigma-Aldrich
(+)-MK-801 hydrogen maleate, powder
Supelco
Ethyl 3-aminobenzoate methanesulfonate salt, analytical standard
Sigma-Aldrich
N-Methyl-D-aspartic acid, ≥98% (TLC), solid