Monosialoganglioside GM1 reduces ischemia--reperfusion-induced injury in the rat retina.

Abstract:

PURPOSE:Gangliosides are normal components of cell membranes, contribute to structural rigidity and membrane function, and have been shown to protect against various insults to the brain. This study evaluates the effect of exogenously administered monosialoganglioside GM1 on retinal damage induced by transient retinal ischemia and reperfusion. METHODS:Retinal ischemia was induced unilaterally in Long Evans rats by increasing intraocular pressure to 160 mm Hg for 60 minutes. GM1 (30 mg/kg, intraperitoneally) or buffer controls were administered at 48 hours, and 15 minutes before ischemia, and survival time after ischemia was either 8 or 15 days. The degree of retinal damage was assessed by histopathologic study according to Hughes' quantification of ischemic damage. RESULTS:Retinal ischemia led to significant reductions in thickness and cell number, principally in the inner retinal layers (30% to 80%), and to a lesser extent in the outer retinal layers (18% to 42%). Pretreatment with intraperitoneally injected monosialoganglioside GM1 conferred significant protection against retinal ischemic damage either 8 or 15 days after ischemic survival time. After 8 days reperfusion, the ischemic-induced loss in overall retinal thickness was reduced by 70%, and those of the inner nuclear and plexiform layers were reduced by 77% and 44%, respectively. Ischemic-induced ganglion cell, inner nuclear, and outer nuclear layer cell density losses were reduced by 45%, 40%, and 57%, respectively. After 15 days of reperfusion, approximately the same statistically significant differences could be observed in comparison with the 15-day ischemic--reperfusion group. CONCLUSIONS:Monosialoganglioside GM1 protects the rat retina from pressure-induced ischemic injury when administered intraperitoneally 2 days before insult. This protection afforded by GM1 can be observed even after 8 days or 15 days of reperfusion.

authors

Weber M,Mohand-Said S,Hicks D,Dreyfus H,Sahel JA

subject

Has Abstract

pub_date

1996-02-01 00:00:00

pages

267-73

issue

2

eissn

0146-0404

issn

1552-5783

journal_volume

37

pub_type

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