From: Neural Stem Cells Derived by Small Molecules Preserve Vision

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Volume 2, Issue 1, (January 2013)
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From: Neural Stem Cells Derived by Small Molecules Preserve Vision Trans. Vis. Sci. Tech.. 2013;2(1):1. doi:10.1167/tvst.2.1.1 Figure Legend: Functional evaluation of NSC, sham-injected, and untreated animals. (A) Visual acuity was tested by OKR at P60, P90, and P160 on animals received subretinal injection of NSCs, sham (BSS), and untreated as controls. Cell-injected eyes performed significantly better than controls at all the time points tested (P < 0.001). At P160, cell-injected animals still had visual acuity of 0.40 ± 0.02 c/d, which is about 77% of the value measured at P30, indicating NSCs preserved visual acuity for 4 months post injection, while control animals were almost non-responsive. (B) Luminance thresholds were recorded from the SC, which examines functional sensitivity across the visual field. Rats were recorded longitudinally for three time points (P90, P150, and P180) to study the efficacy of NSC grafting with time. It revealed that NSC injected eyes had significantly lower luminance thresholds compared with controls (P < 0.001). For examples, over 85%, 70%, and 60% of the SC area have luminance threshold lower than 2.06 log units at P90, P150, and P180, respectively, only 5% of the SC area has luminance thresholds lower than 2.06 log units in medium injected animals at P90. It is noted that there is deterioration over time even in NSC treated eyes. (C) Row data recorded from NSC-grafted and untreated sides in the SC at P100. It showed that luminance thresholds are much lower on the cell-grafted side than the untreated side. Typically in the RCS rat at P100, luminance thresholds are around 2.5 to 3.0 log units; some points on the cell-grafted side are over 100 times more sensitive to light stimulation than untreated control side (e.g., 0.7 vs. 2.9). (D) Visual acuity in animals received subretinal injection of NSCs labeled with EGFP by lentiviral transduction and stable integration into the genome (NSCs-GFP) was tested at P60 and P90 by OKR. It revealed that NSCs-GFP injected animals performed significantly better than sham and untreated controls (P < 0.001). (E) Visual acuity in animals received subretinal injections of NSCs and NSCs-GFP. Data from NSC and NSCs-GFP treated group was compared; it revealed that there was no statistically difference (P > 0.05) between the groups at both time points (P60 and P90) tested by OKR. (F) Efficacy after intravitreal injection of NSCs. NSCs were injected into vitreous cavity (same dose as subretinal injection); OKR was conducted at both P60 and P90. It showed that intravitreal injection of NSCs produced significantly better visual acuity than sham and untreated controls (P < 0.001), indicating trophic effect of NSCs in preserving vision. Date of download: 10/2/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.