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Retinal ganglion cell death after different transient periods of pressure-induced ischemia and survival intervals. A quantitative in vivo study.

Abstract：

PURPOSE:To quantitate in vivo retinal ganglion cell (RGC) survival after transient periods of pressure-induced ischemia of the rat retina and after different survival intervals. METHODS:In adult rats, RGCs were labeled with fluorogold applied to their main targets in the brain. Seven days later, in several groups of rats, the left retinas were subjected to transient periods of ischemia of 30, 45, 60, 75, 90, 105, or 120 minutes, respectively, by increasing the intraocular pressure (IOP) of the left eye above systolic values. Five, 7, 14, and 30 days later, the rats were killed, and their retinas were prepared as wholemounts for examination under fluorescence microscopy to estimate RGC survival. RESULTS:The authors found that periods of ischemia of 30 and 45 minutes do not induce RGC death; longer periods of transient ischemia induce the death of a proportion of RGCs, and the proportion increases with the duration of the ischemia; RGC death, which can be observed as early as 5 days after ischemia, continues during the 30-day study period; and periods of ischemia that last 90 minutes or more cause the death of approximately 95% of the RGC population 30 days later. CONCLUSIONS:Increases of the IOP above systolic levels for periods of 60 minutes or more result in RGC loss in the rat retina. Both the duration of the initial transient period of ischemia and the duration of the survival period influence the proportion of RGC death.

journal_name

Invest Ophthalmol Vis Sci

journal_title

Investigative ophthalmology & visual science

authors

Sellés-Navarro I,Villegas-Pérez MP,Salvador-Silva M,Ruiz-Gómez JM,Vidal-Sanz M

subject

Has Abstract

pub_date

1996-09-01 00:00:00

pages

2002-14

issue

10

eissn

0146-0404

issn

1552-5783

journal_volume

37

pub_type

杂志文章

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