Combined cSLO-OCT imaging as a tool in preclinical ocular toxicity testing: A comparison to standard in-vivo and pathology methods.
J Pharmacol Toxicol Methods
; 104: 106873, 2020.
Article
em En
| MEDLINE
| ID: mdl-32413488
ABSTRACT
INTRODUCTION:
Confocal scanning laser ophthalmoscopy and optical coherence tomography (cSLO-OCT) became available for human and animal ophthalmic examinations in recent years. The purpose of this study was to evaluate lesion detection and localization with cSLO-OCT imaging in an experimental outer retinal toxicity model and to compare cSLO-OCT to standard examination methods (indirect ophthalmoscopy (IO), fundus photography (FP) and central section histopathology).METHODS:
A test compound was orally administered to albino rats (n = 4) for four weeks (part A) and to albino (n = 2) and pigmented (n = 2) rats for eight weeks (part B). Control animals received vehicle only. Retinal changes were documented using cSLO-OCT, IO, FP, angiography and histopathology. Retinal thicknesses were compared between groups using a mixed effects model.RESULTS:
All compound-treated animals developed progressive multifocal hyperreflective spot changes mostly confined to the retinal pigment epithelium. In study parts A and B, cSLO identified fundus lesions earlier than IO/FP in albino rats. In study part B, cSLO quantified fundus lesions more accurately than IO/FP in albino rats but no difference was seen in pigmented rats. Central section histopathology revealed no abnormalities in three out of four compound-treated animals in part B. Altogether, without cSLO-OCT, present fundus changes would have remained undetected in one of four compound-treated animals in both parts A and B.DISCUSSION:
Integration of combined cSLO-OCT imaging into toxicology study design can improve toxicity study readouts and facilitate longitudinal examination of single animals at multiple time points, leading to a reduction of experimental animal numbers.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Oftalmoscopia
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Retina
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Testes de Toxicidade
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Tomografia de Coerência Óptica
Limite:
Animals
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article