Volume 9, Issue 1, Pages (July 2017)

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Volume 9, Issue 1, Pages 42-49 (July 2017) The Developmental Stage of Adult Human Stem Cell-Derived Retinal Pigment Epithelium Cells Influences Transplant Efficacy for Vision Rescue  Richard J. Davis, Nazia M. Alam, Cuiping Zhao, Claudia Müller, Janmeet S. Saini, Timothy A. Blenkinsop, Francesca Mazzoni, Melissa Campbell, Susan M. Borden, Carol J. Charniga, Patty L. Lederman, Vanessa Aguilar, Michael Naimark, Michael Fiske, Nathan Boles, Sally Temple, Silvia C. Finnemann, Glen T. Prusky, Jeffrey H. Stern  Stem Cell Reports  Volume 9, Issue 1, Pages 42-49 (July 2017) DOI: 10.1016/j.stemcr.2017.05.016 Copyright © 2017 The Author(s) Terms and Conditions

Figure 1 RPESC-RPE Mature over 8 Weeks in Culture (A) Passage 0 (P0) RPE cells dissociated from donor cadaver eyes were expanded in culture, re-plated, re-expanded, and then frozen at passage 1 (P1). (B) Banked P1 cells were thawed and cultured to obtain passage 2 (P2) cells at 2-, 4-, or 8-week stages. Representative phase and immunostained images are shown for OTX2, MITF, or ZO-1 expression. Insets show digitally zoomed high magnification images. Scale bar, 50 μm. (C) The fraction of cells expressing Ki67 (Ki67+/DAPI) at 2, 4, and 6/7 weeks. One-way ANOVA (p < 0.01) followed by Tukey's multiple comparison test (2 versus 4, p = 0.0006; 2 versus 6/7, p = 0.0003; 4 versus 6/7, not significant). (D) Secretion of VEGF-A (left) and PEDF (right) from apical and basal surfaces on a transwell membrane also rise during the 8-week RPE maturation period. Stem Cell Reports 2017 9, 42-49DOI: (10.1016/j.stemcr.2017.05.016) Copyright © 2017 The Author(s) Terms and Conditions

Figure 2 Phagocytic Activity of RPESC-RPE with Maturation (A–D) RPESC-RPE cultured on transwell membrane (A) for 2–3 (B), 4–5 (C), or 7–8 weeks (D) were challenged with FITC-labeled POS (B–D). Representative confocal central image stacks show the distribution of internalized POS in green. ZO-1 labeling (red) indicates tight junctions. (E and F) Quantification shows the percentage of cells with internalized POS (E) and the amount of internalized POS per area (F) after 5 hr of POS exposure, expressed as mean ± SEM from three different cell lines for each stage of maturation (shown in weeks, x axes). Asterisks indicate significant differences between groups indicated by horizontal bars; ∗ = p < 0.05 by ANOVA. Scale bar, 20 μm. Stem Cell Reports 2017 9, 42-49DOI: (10.1016/j.stemcr.2017.05.016) Copyright © 2017 The Author(s) Terms and Conditions

Figure 3 RPESC-RPE Transplantation Photoreceptor Rescue (A) H&E stained retinal sections from wild-type Long Evans (WT), and P100 unoperated (Unop) or RPESC-RPE transplanted (Cells) RCS rat retinas. White arrows indicate loss of ONL. (B and C) Quantification of ONL rescue after RPESC-RPE transplantation into the temporal region of the eye. (B) Matrix and (C) graphical representations of DAPI-stained nuclei counts across the nasal-temporal and inferior-superior axes. Rows contain the average number of nuclei over ∼100–150 μm intervals. Columns contain counts from slides spaced at 200 μm intervals. cb, ciliary body; onh, optic nerve head. (B) Average counts from an RPESC-RPE injected eye. (C) Comparison of the number of rescued photoreceptor nuclei in 17 rats after subretinal injection with 2, 4, or 7 week RPESC-RPE in the temporal region (bracket in B). Three donor lines were used as follows: 228, 4 weeks, 2; 228, 7 weeks, 3; 229, 2 weeks, 3; 229, 4 weeks, 5; 230, 4 weeks, 4. Error bars indicate SD; no significant difference was observed between the 2-, 4-, and 7-week developmental stages tested. Stem Cell Reports 2017 9, 42-49DOI: (10.1016/j.stemcr.2017.05.016) Copyright © 2017 The Author(s) Terms and Conditions

Figure 4 Stage-Dependent RPESC-RPE Transplantation Vision Rescue (A) RPESC-RPE cultured for 2, 4, or 7–8 weeks were transplanted into 55 RCS rats. (B) Spatial frequency thresholds were measured (cycles/degree) at P90 after transplant of 50,000 line 229 RPESC-RPE grown for 2–8 weeks. Cells differentiated for 3, 4, or 8 weeks rescued vision more effectively than 2-week cells or unoperated and BSS injected controls (∗ = p < 0.05 compared with BSS control). Other significant differences are: unoperated versus 3, 4, and 8 weeks, p < 0.01; and 2 versus 4 weeks, p < 0.05. (C) Line 228 and 230 data at 4 and 7 weeks compiled from five experiments. ∗ = p < 0.05 indicates comparison with BSS controls. Other significant comparisons are: unoperated versus 228 at 4 and 7 weeks and 230 at 4 weeks, p < 0.01; 228 at 4 and 7 weeks versus 230 at 8 weeks, p < 0.01; and 230 at 4 weeks versus 230 at 7 weeks, p < 0.01. Statistical analysis was a Kruskal-Wallis test (p < 0.0001) followed by Dunn's multiple comparisons test and correction by the two-stage Benjamini, Hochberg, Yekutieli false discovery rate method. (D) To compare 4 week cells with 7/8 week cells, data from (B) and (C) were grouped and analyzed using a Mann-Whitney test, which indicated that 4-week cells rescued vision more effectively than 7- to 8-week cells (p < 0.0001). Stem Cell Reports 2017 9, 42-49DOI: (10.1016/j.stemcr.2017.05.016) Copyright © 2017 The Author(s) Terms and Conditions