Journal: Development (Cambridge, England)
Article Title: Deletion of an enhancer that controls Wnt gene expression following tissue injury produces increased adipogenesis in regenerated muscle
doi: 10.1242/dev.204933
Figure Lengend Snippet: Wnt1 and Wnt10b are induced by tissue injury following BaCl 2 injection. (A,B) Wnt expression post-BaCl 2 -induced injury in skeletal muscle, assessed by RNAscope mRNA in situ hybridization. Wnt1 (A) and Wnt10b (B) expression in TA muscle at 1, 3, 5 and 7 days following BaCl 2 injection are shown. Uninjured contralateral muscle at 1 day post-injury is shown for comparison. Wnt1 - and Wnt10b -positive cells are infrequently observed in uninjured muscle. Transcripts appear in single cells post-injury and then in nascent myofibers, which display centrally located nuclei. Boxes mark regions enlarged under each panel. Arrows mark red mRNA signals. Yellow dashed lines outline myofibers. (C,D) Quantification of Wnt1 and Wnt10b expression at days 1 and 3 post-injury. (C) The number of Wnt1 -positive nuclei increases significantly at 1 and 3 days post-injury compared to uninjured contralateral muscles. * P =0.0155, ** P =0.0026 (one-way ANOVA, Kruskal–Wallis test). n =8 uninjured represents n =4 d1 uninjured, n =4 d3 uninjured; n =6 d1 BaCl 2 , n =5 d3 BaCl 2 . (D) Number of Wnt10b -positive nuclei increases significantly at 1 and 3 days post-injury compared to uninjured contralateral muscles. * P =0.0378, ** P =0.0076 (Brown–Forsythe and Welch one-way ANOVA tests). n =6 uninjured consists of n =3 d1 uninjured, n =3 d3 uninjured; n =4 d1 BaCl 2 , n =5 d3 BaCl 2 . (E,F) Duplex mRNA in situ hybridization showing Wnt1 (E) and Wnt10b (F) signals in Pdgfra- , Pax7- and Adgre- positive cells, which mark the FAPs, satellite cells and macrophages, respectively, at 3 days post-injury. Arrows point to examples of double-positive nuclei. n =2 animals. (G) Duplex mRNA in situ hybridization showing that Wnt1 and Wnt10b can be colocalized. Representative examples from 1, 3 and 5 days post-injury are shown. White numbered boxes mark regions magnified below each image. Yellow dashed lines mark individual nuclei. Arrows mark Wnt double-positive cells. Box limits mark the 25th and 75th percentiles, whiskers mark minimum to maximum values, and horizontal line marks the median. d, days post-injury; ns, not significant. Scale bars: 20 µm (A,B); 5 µm (E-G).
Article Snippet: Probes utilized for assays were: Srp14 (Mm00726104_s1), Pax7 (Mm01354484_m1), Pdgfra (Mm00440701_m1), Cebpb (Mm00843434_s1), Wnt1 (Mm01300555_g1), Wnt10b (Mm00442104_m1), Wnt5a (Mm00437347_m1), Cebpa (Mm00514283_s1), Pparg (Mm00440940_m1), Axin2 (Mm_00443610).
Techniques: Injection, Expressing, RNAscope, In Situ Hybridization, Comparison, Muscles