Vigabatrin, the GABA-transaminase inhibitor, damages cone photoreceptors in rats.

Abstract:

:Epileptic patients experienced an irreversible loss of their peripheral visual field upon treatment with vigabatrin (gamma-vinyl GABA), an inhibitor of the GABA degrading enzyme, GABA transaminase. Subsequently, central visual function was reported to also be irreversibly altered. This visual loss is associated with a decrease in the electroretinogram measurement localizing the deficit to the retina. To investigate its cellular origin, we treated rats daily with vigabatrin for 45 days. Two days after arresting this treatment, rats exhibited an irreversible decrease in the photopic electroretinogram, the flicker response, and the oscillatory potentials. These functional alterations were associated with a peripheral disorganization of the outer retina. However, photoreceptor damage was not limited to these disorganized areas, but cone inner and outer segments were severely injured in more central areas and their numbers were irreversibly decreased by 17 to 20%. Ultrastructural examination of the retina confirmed the presence of major photoreceptor damages, which were further supported by terminal deoxynucleotidyltransferase-mediated dUTP nick end labeling (TUNEL) and caspase-3 activation both indicative of photoreceptor apoptosis. This study suggests that the visual field loss in vigabatrin-treated epileptic patients may result from a sequence of events starting from cone cell injury to a more severe disorganization of the photoreceptor layer.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Duboc A,Hanoteau N,Simonutti M,Rudolf G,Nehlig A,Sahel JA,Picaud S

doi

10.1002/ana.20081

keywords:

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

695-705

issue

5

eissn

0364-5134

issn

1531-8249

journal_volume

55

pub_type

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