From: Neuroprotective Effects of Transcription Factor Brn3b in an Ocular Hypertension Rat Model of Glaucoma Invest. Ophthalmol. Vis. Sci.. 2015;56(2):893-907.

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From: Neuroprotective Effects of Transcription Factor Brn3b in an Ocular Hypertension Rat Model of Glaucoma Invest. Ophthalmol. Vis. Sci.. 2015;56(2):893-907. doi:10.1167/iovs.14-15008 Figure Legend: Administration of viral vectors following IOP elevation by the Morrison's method in Brown Norway rats. (A) Experimental scheme: IOP was elevated in one eye of Brown Norway rats using the Morrison's method followed by intravitreal injection of either rAAV-CMV-GFP or rAAV-CMV-Brn3b (1 × 109 particles per eye). Intraocular pressure measurements were carried for 3 weeks following the virus injection after which, the Brown Norway rats were killed. Some experimental groups of rats were additionally injected with Alexa-fluor 555 conjugated Cholera Toxin subunit B (CT-B; 48 hours prior to euthanization) to assess axonal transport changes. In a separate set of experiments, following baseline measurements of optomotor tests, RGCs were retrogradely labeled with Fluorogold in Brown Norway rats. Intraocular pressure elevation was carried out in one eye of the rats by the Morrison's method and rats were maintained for 4 to 6 weeks (until an IOP exposure of 120 mm Hg-days was obtained). Optomotor testing was carried out to determine changes in visual acuity after IOP elevation. rAAV-hsyn-GFP or rAAV-hsyn-Brn3b viruses (1 × 109 particles per eye) were injected in the IOP-elevated eye and maintained for an additional 4 weeks. Optomotor tests were continued to assess the effect of Brn3b overexpression on visual acuity in IOP-elevated rat eyes. Rats were killed and retinal flat mounts were prepared and RGC counts were obtained. Optic nerve sections obtained from the rats were stained with PPD to assess integrity of the optic nerve. Total number of rats tested was n = 14 for Brn3b protein overexpression and n = 15 for control vector. (B) Intraocular pressure elevation profile in Brown Norway rats. Intraocular pressure was elevated in one eye of adult male Brown Norway rats using the Morrison's method following which AAV-2 viruses were administered. Intraocular pressure values were obtained and plotted as mean ± SEM (solid line, IOP-elevated and virus-injected eye; dashed line, untreated contralateral eye). Asterisk indicates P < 0.001 statistical significance of the IOP-elevated IOP eye compared with contralateral eye using a t-test. Date of download: 11/9/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.