PMID: 8603831Feb 1, 1996Paper

Protection of rabbit retina from ischemic injury by flupirtine

Investigative Ophthalmology & Visual Science
N N OsborneG Pergande

Abstract

The aim of this study was to determine wether flupirtine can slow down the changes seen in the rabbit retina after ischemia--reperfusion. A suction-cup procedure, which raises intraocular pressure, was used to give an ischemic insult to the rabbit retina. Electroretinograms were recorded before ischemia and at different periods after ischemia. In some instances, flupirtine was injected into the eye before ischemia. Immunohistochemistry was used to study the effect of ischemia-reperfusion on the gamma-aminobutyric acid (GABA) immunoreactivity and uptake of serotonin by the retina. The effect of flupirtine and ischemia on retinal adenosine triphosphate (ATP) levels were determined in in vivo and in vitro experiments. Ischemia for 75 minutes causes a change in the nature of normal GABA immunoreactivity and reduction in the b-wave of the electroretinogram. When flupirtine is injected into the vitreous humor at the onset of ischemic insult, the changes in GABA immunoreactivity are reduced and the recovery of the reduced b-wave of the electroretinogram after defined reperfusion times is enhanced significantly. Rat retinas incubated in vitro in physiological solution containing flupirtine caused a significant rise in the tissues' ATP ...Continue Reading

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