Fig. 2 Characterization of an iPS-derived skeletal muscle fiber bundle and an MN spheroid. Characterization of an iPS-derived skeletal muscle fiber bundle.

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Fig. 2 Characterization of an iPS-derived skeletal muscle fiber bundle and an MN spheroid. Characterization of an iPS-derived skeletal muscle fiber bundle and an MN spheroid. (A) Fabricated skeletal muscle fiber bundle approximately 1500 μm in length attaching the pillars at D7 and D21. Scale bars, 200 μm. (B) The population of myogenin-positive cells on muscle fiber bundle. n = 5. (C) Fusion index for skeletal muscle cells in a 3D micro device and a 2D monolayer. n = 8. (D) Regular pattern of a sarcomere structure stained by sarcomeric α-actinin and F-actin. Scale bars, 50 μm. DAPI, 4′,6-diamidino-2-phenylindole. (E) Gene expression change of MyoD, myogenin, and FHL1 (F) at D7, D14, and D21 against D0 or D7. n = 5. GAPDH, glyceraldehyde 3-phosphate dehydrogenase. N.D., not determined. (G) Muscle contraction powered by electrical stimulation at different frequencies (0.5 to 4 Hz). (H) Formation of an NSC spheroid and differentiation characterized by the immunostaining of HB9 and 3D reconstruction stained by Tuj1. Scale bars, 200 μm. (I) mRNA expression level of an MN spheroid at D14, D28, and D42. MNP, motor neuron progenitor. (J) Determination of necrotic cell death and cell cycle determined by HIF-1α expression and Ki67. N.S., not significant. (K) Histological immunostaining of PDK1 and DAPI. The MN spheroid is divided into three regions inside the spheroid: (i) normoxia region, (ii) hypoxia region, and (iii) necrotic death region. Scale bars, 200 μm. (L) NSC-MN spheroid culture (green, Tuj1; red, islet1) on a laminin-coated dish. After the formation of NSC spheroids on D20 and D40, the spheroids were seeded into a laminin-coated dish and cultured for an additional 5 days to visualize neurite elongation. Thick nerve fiber can be seen connecting two MN spheroids on D45. Scale bars, 200 μm. *P < 0.05; **P < 0.01, Student’s t test and one-way analysis of variance (ANOVA). Error bars ± SD. Tatsuya Osaki et al. Sci Adv 2018;4:eaat5847 Copyright © 2018 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).