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Background ophthalmological changes following subretinal injection in the brown Norway rat
Author(s) -
Vezina M.,
Li C.,
Bussieres M.
Publication year - 2015
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2015.0675
Subject(s) - medicine , ophthalmology , choroid , bleb (medicine) , retinal , retina , depigmentation , sclera , vitreous chamber , surgery , glaucoma , eye disease , refractive error , trabeculectomy , physics , dermatology , optics
Purpose The purpose of the study was to evaluate the background changes associated with transscleral subretinal injection in Brown Norway ( BN ) rats Methods Fifteen BN rats received a bilateral transscleral subretinal injection of saline at a volume of 6 μL while under isoflurane anesthesia. The eyes were examined by slit lamp and indirect ophthalmoscope the day following injection and 1, 2, 3, 4, 8 and 12 weeks post injection Results Procedure‐related changes included the following observations: Transient corneal opacities occurred in 16/30 eyes that were considered related to the anesthesia. Cataracts developed in 5/30 eyes associated with lens trauma at the time of dosing. Slight vitreous hemorrhages occurred post dose in 28/30 eyes, resolving in all but 2 eyes by 4 weeks. An area of focal depigmentation of the retina/choroid or white focal retinal opacity was seen at the needle insertion site at the retina in 22/30 eyes, resolving by 4 weeks for 13 eyes and persisting up to 12 weeks for the remaining 7. In the bleb itself, there were focal areas of irregular pigmentation in 13/30 eyes resolving in all but 2 eyes by week 4. The remaining 2 persisted up to week 12. This was considered secondary to the physical neuro‐retinal separation caused by the bleb formation. Slight retinal/choroidal hemorrhages were also seen at the injection site in most eyes up to week 4 Conclusions In conclusion, transscleral subretinal injection in BN rats generally resulted in slight ocular trauma that resolved in most eyes by 4 weeks post injection. It is important to take these changes into account when designing the study and evaluating therapeutics administered by this dose route.