Fig. 4
The Bmp2b inhibitor suppresses OPC migration to the dorsal area. (A,B) qRT-PCR analysis indicated that bmp2b gene mRNA expression was significantly downregulated after hypoxia and CoCl2 exposure. (C,D) Bmp2b protein expression was analyzed with western blots. The results showed that hypoxia blocked Bmp2b protein translation. Thirty zebrafish 4-dpf larvae were pooled for western blots experiments. (E,F) The number of dorsally migrated olig2+ cells at 3 and 4 dpf decreased after LDN193189 treatment. E1′, E2′, E3′, and E4′ are magnified pictures of the white boxes in E1, E2, E3, and E4. Scale bars: E1–E4, 50 μm and E1′–E4′, 10 μm. Two-way ANOVA, P < 0.0001: Student’s two-tailed t-test. Significantly more cells were dorsally migrated in 3-dpf control larvae as compared to 3-dpf larvae treated with 10 μM LDN193189 (n = 12; P < 0.0001). Significantly more cells were dorsally migrated in 4-dpf normoxic larvae as compared to 4-dpf larvae treated with 10 μM LDN193189 (n = 10; P < 0.0001). ∗P < 0.05; ∗∗P < 0.01; ∗∗∗P < 0.001; ∗∗∗∗P < 0.0001. Error bars represent S.E.M.