N-methyl-D-aspartate-induced excitotoxicity in adult rat retina is antagonized by single systemic injection of MK-801
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香港中文大學研究人員

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摘要Intravitreal injection of N-methyl-D-aspartate (NMDA) produced a substantial damage to the adult rat retina that was largely restricted to inner retinal layers, including the ganglion cell layer (GCL), inner nuclear layer (INL), inner, and outer plexiform layers. This retinal damage was significantly reduced by a systemic injection of a low dose of MK-801 (0.5 mg/kg), a potent NMDA-receptor antagonist. This neuroprotection was dose dependent and was most effective when the antagonist was given 1 h before NMDA insult. An intraperitoneal injection of 0.5 mg/kg MK-801 provided a virtually complete protection to the retina to the NMDA-induced toxicity, as indicated quantitatively by the number of DiI-filled retinal ganglion cells, the number of cells in the GCL and INL that undergo DNA fragmentation, and the edematous changes in retinal thickness. A post-lesion administration of MK-801 was still able to provide an effective neuroprotective effect to the retina, but this protection was lost when MK-801 was given 4 h after NMDA exposure. The current results indicate a therapeutic potential of systemic application of MK-801 in protecting the adult rat retina From neurologic disorders related to excessive activation of NMDA receptors.
著者Sun Q, Ooi VEC, Chan SO
期刊名稱Experimental Brain Research
出版年份2001
月份5
日期1
卷號138
期次1
出版社SPRINGER-VERLAG
頁次37 - 45
國際標準期刊號0014-4819
語言英式英語
關鍵詞cell death; excitatory amino acids; glutamate; neuroprotection; neurotoxicity
Web of Science 學科類別Neurosciences; NEUROSCIENCES; Neurosciences & Neurology

上次更新時間 2021-26-02 於 01:45