Fig. 3 IRF8 is required for macrophage migration toward the epicenter in the injured spinal cord during the recovery phase. IRF8 is required for macrophage.

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Fig. 3 IRF8 is required for macrophage migration toward the epicenter in the injured spinal cord during the recovery phase. IRF8 is required for macrophage migration toward the epicenter in the injured spinal cord during the recovery phase. (A) CD45-gated cells in the injured cord were divided into CD11b+/CD45high/Ly6G− infiltrating macrophages. The cell numbers of these macrophages in the injured cord of WT/IRF8−/− mice were quantitatively counted using the FACS software program. FITC, fluorescein isothiocyanate; PE, phycoerythrin; SSC, side scatter; APC, allophycocyanin. (B) The cell numbers of macrophages in the injured cord of IRF8−/− mice were comparable to those of WT mice after SCI (n = 6 per group). Although IRF8−/− mice generate reduced numbers of monocytes/macrophages (66), these results indicate that macrophage infiltration into the injured spinal cord does not require IRF8. n.s., not significant. (C) Change in the distribution of CD68+ macrophages over time. The location of macrophages shifted toward the lesion epicenter from 4 to 14 dpi after injury in WT mice, whereas the macrophages of IRF8−/− mice remained widely scattered in the injured cord. The fine lines indicate the outlines of the spinal cords. Asterisk indicates the epicenter of the lesion. (D) Distribution of macrophages in WT or IRF8−/− mice at 42 dpi. The fine lines indicate the outlines of the spinal cords. Asterisk indicates the epicenter of the lesion. (E) Comparison of the craniocaudal distribution of macrophages in injured cords between WT and IRF8−/− mice (n = 8 WT, 7 IRF8−/− mice per group at each time point, respectively). (F) EGFP+-IRF8+/+ (left) or EGFP+-IRF8−/− (right) monocytes isolated from the peripheral blood of EGFP+-IRF8+/+ or EGFP+-IRF8−/− mice as EGFPposi/CD11bposi/Ly6Gnega/CD115posi monocytic population (fig. S3), respectively, were injected into 2 mm rostral to the epicenter of the injured spinal cord of WT mice once immediately after SCI. Representative images of the immunofluorescent staining of spinal cord injected with these monocytes after SCI. Tp; transplantation of EGFP+ monocytes. The fine broken lines indicate the outlines of the spinal cords. The coarse broken lines indicate the area of the EGFP−/CD68+ host macrophages. The asterisks indicate the epicenters of injured spinal cord. The arrowheads indicate the injection point of the EGFP+ macrophages. Inset: High-magnification image. The nucleus was counterstained with Hoechst 33258 dye (blue). Scale bar, 20 μm. The images shown are representative of six slides from three mice per time point per group. (G) Distances of EGFP+-IRF8+/+ or EGFP+-IRF8−/− macrophages from the epicenter at each time point (n = 6 sections/three mice per each time point per group). (H) Schematic representation of intravenous (I.V.) injection of EGFP+-IRF8+/+ or EGFP+-IRF8−/− monocytes after SCI. EGFP+-IRF8+/+ or EGFP+-IRF8−/− monocytes were daily injected intravenously from 1 to 3, 4 to 6, or 7 to 13 dpi. (I) Quantitative analysis of the infiltrating EGFP+ macrophages in the injured cord of mice intravenously injected with EGFP+ macrophages from 1 to 3, 4 to 6, or 7 to 13 dpi (n = 4 sections/four mice per group) (see also fig. S4). The images shown in (C) and (D) are representative of eight or seven slides from eight WT/seven IRF8−/− mice per each time point. Scale bars, 500 μm (C, D, and F). *P < 0.05 and **P < 0.005, Wilcoxon rank-sum test (B), two-way repeated-measures ANOVA with the Tukey-Kramer post hoc test (E and I), and ANOVA with the Tukey-Kramer post hoc test (G). The data are presented as means ± SEM (B, E, G, and I). Kazu Kobayakawa et al. Sci Adv 2019;5:eaav5086 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).