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Muscle regeneration by reconstitution with bone marrow or fetal liver cells from green fluorescent protein-gene transgenic mice

So-ichiro Fukada1, Yuko Miyagoe-Suzuki2, Hiroshi Tsukihara1, Katsutoshi Yuasa2, Saito Higuchi1, Shiro Ono3, Kazutake Tsujikawa1, Shin'ichi Takeda2 and Hiroshi Yamamoto1,*

1 Department of Immunology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
2 Department of Molecular Therapy, National Institute of Neuroscience, National Center of Neurology and Psychiatry, Kodaira, Tokyo 187-8502, Japan
3 Division of Oncogenesis, Biomedical Research Center, Osaka University Graduate School of Medicine, Suita, Osaka 565-0871, Japan



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Fig. 1. Experimental protocols for chimeras. For more details see the Materials and Methods section.

 


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Fig. 2. Flow cytometric analyses of leukocyte chimerisms. (A) Splenocyte chimerisms of radiation-bone marrow chimera. (B) GFP+CD4+ and GFP+CD8+ T cells of the gated fraction of (A). (C) GFP+ cells in the peripheral blood of neonatal-bone-marrow chimera 4 weeks after reconstitution (4 weeks old). Splenic GFP+ cells (D) and splenic GFP+CD4+ and GFP+CD8+ T cells (E) of mouse C 9 weeks after reconstitution. (F) GFP+ bone marrow cells of mouse (C). (G) GFP+ cells in the peripheral blood of a neonatal-fetal liver cell chimera 4 weeks after reconstitution (4 weeks old). Thymic GFP+ cells (H), and CD4 and CD8 stainings of thymocytes (I) of mouse G at 10 weeks after reconstitution. Splenic GFP+ cells (J) and its GFP+CD4+ and GFP+CD8+ T cells (K) of mouse G. (L) GFP+ bone marrow cells of mouse G.

 


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Fig. 3. Detection of GFP+ muscle fibres in the radiation bone marrow chimeras. H-E staining (A,C,E) and GFP fluorescence (B,D,F) of TA (A,B) and VL (C,D) muscles and diaphragm (E,F) of radiation-bone-marrow chimera. (G) GFP+ TA muscle fibre; (H) dystrophin staining (Texas-Red-conjugated anti-dystrophin antibody); (I) mixed color of (G) and (H); (J) GFP fluorescence; (K) dystrophin-staining; (L) the mixed color of (J) and (K) from the TA muscle of a normal C57BL/6 mouse as a control. Bars, 100 µm (A-F) and 50 µm (G-I).

 


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Fig. 4. Detection of GFP+ muscle fibres and possible satellite cells in neonatal chimeras. H-E staining (A,C,E) and GFP fluorescence (B,D,F) of CTX-treated TA muscles of neonatal chimeras. (A,B) Neonatal bone marrow chimera; (C-F) neonatal fetal liver cell chimera; (G,H) a single GFP+ fibre with peripheral nucleus in a intact (CTX-untreated) neonatal bone marrow chimera; (I) detection of a GFP+ mononuclear cell beneath the laminin layer (rabbit anti-laminin plus rhodamine-conjugated goat anti-rabbit IgG) (neonatal bone marrow chimera); (J-O) desminstained explanted fibres (J,L,M,O) were examined for GFP fluorescence (J,K,M,N). A GFP+ cell attaching to a single fibre was stained with desmin (arrowheads of (L) and (O)). (P) Positive control of explanted muscle cells from GFP-Tg mouse (mixed color of desmin and GFP); (Q-T) are muscle sections of the secondary mdx/scid recipient. Single cell suspension from intact (CTX-untreated) muscles of neonatal bone marrow chimera was obtained and injected into CTX-treated TA muscle of the mdx/scid recipient. GFP+ fibres were observed (arrowheads of (R) and (T)). Bar, 50 µm (A-H and Q-T).

 


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Fig. 5. Muscle-reconstituting efficiencies of bone marrow and fetal liver cells. Muscle-reconstituting efficiencies of neonatal bone marrow and fetal liver cells were compared as a factor of GFP+ muscle fibres/injected cell numbers. From the data shown in Table 1, both CTX-treated normal C57BL/6 and CTX-untreated mdx recipient mice were calculated.

 

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© The Company of Biologists Ltd 2002