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. 2020 Oct 20;28(3):1041–1061. doi: 10.1038/s41418-020-00636-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — Representative hematoxylin and eosin (H&E) staining images of retinal tissues (A) and the corresponding quantitative analysis of outer nuclear layer (ONL) thickness (B). WT-EXOT transplantation of exosomes derived from wild-type mesenchymal stem cells (MSCs) after MNU injection, miR-21^−/−-EXOT transplantation of exosomes derived from miR-21-deficient MSCs after MNU injection, GCL ganglion cell layer, INL inner nuclear layer, ONH optic nerve head. Scale bars = 50 μm. *P < 0.05 by the Kruskal–Wallis test for area under curve (AUC). N = 3 per group. Representative scotopic electroretinography (ERG) waveforms (C) and the corresponding quantitative analyses of amplitude changes of a-wave (D) and b-wave (E). *P < 0.05 by the Kruskal–Wallis tests. N = 6 per group. Representative photopic ERG waveforms (F) and the corresponding quantitative analysis of b-wave amplitude changes (G). *P < 0.05 by the Kruskal–Wallis tests. N = 6 per group. Representative terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL, green) staining images of retinal tissues counterstained by Hoechst 33342 (blue) (H) and the corresponding quantitative analysis of percentages of TUNEL⁺ cells over total ONL cells (J). Scale bars = 50 μm. *P < 0.05 by the Kruskal–Wallis test. N = 3 per group. Representative TUNEL (green) staining images of retinal tissues counterstained by Hoechst 33342 (blue) (I) and the corresponding quantitative analysis of percentages of TUNEL⁺ cells over total ONL cells (K). Ctrl control, NC negative control of miR-21 mimics. MNU-injected mice were transplanted with exosomes derived from miR-21-deficient MSCs, which were transfected with or without NC or miR-21 mimics. Scale bars = 50 μm. *P < 0.05 by the Kruskal–Wallis test. N = 3 per group. Representative H&E staining images of retinal tissues (L) and the corresponding quantitative analysis of ONL thickness (M). Scale bars = 50 μm. *P < 0.05 by the Kruskal–Wallis test for AUC. N = 3 per group. Representative scotopic ERG waveforms (N) and the corresponding quantitative analyses of amplitude changes of a-wave (O) and b-wave (P). *P < 0.05 by the Kruskal–Wallis tests. N = 6 per group. Representative photopic ERG waveforms (Q) and the corresponding quantitative analysis of b-wave amplitude changes (R). *P < 0.05 by the Kruskal–Wallis tests. N = 6 per group. S Diagram showing the synopsis of the findings. Data represent median ± range for (B), (J), (K), and (M). Data are represented as box (25th, 50th, and 75th percentiles) and whisker (range) plots for (D), (E), (G), (O), (P), and (R).