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Bentzinger CF, von Maltzahn J, Dumont NA, Stark DA, Wang YX, Nhan K, Frenette J, Cornelison DDW, Rudnicki MA. Wnt7a stimulates myogenic stem cell motility and engraftment resulting in improved muscle strength. J Cell Biol 2014; 205:97-111. [PMID: 24711502 PMCID: PMC3987134 DOI: 10.1083/jcb.201310035] [Citation(s) in RCA: 114] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 03/05/2014] [Indexed: 12/19/2022] Open
Abstract
Wnt7a/Fzd7 signaling stimulates skeletal muscle growth and repair by inducing the symmetric expansion of satellite stem cells through the planar cell polarity pathway and by activating the Akt/mTOR growth pathway in muscle fibers. Here we describe a third level of activity where Wnt7a/Fzd7 increases the polarity and directional migration of mouse satellite cells and human myogenic progenitors through activation of Dvl2 and the small GTPase Rac1. Importantly, these effects can be exploited to potentiate the outcome of myogenic cell transplantation into dystrophic muscles. We observed that a short Wnt7a treatment markedly stimulated tissue dispersal and engraftment, leading to significantly improved muscle function. Moreover, myofibers at distal sites that fused with Wnt7a-treated cells were hypertrophic, suggesting that the transplanted cells deliver activated Wnt7a/Fzd7 signaling complexes to recipient myofibers. Taken together, we describe a viable and effective ex vivo cell modulation process that profoundly enhances the efficacy of stem cell therapy for skeletal muscle.
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MESH Headings
- Adaptor Proteins, Signal Transducing/metabolism
- Animals
- Cell Fusion
- Cell Line
- Cell Movement
- Cell Polarity
- Disease Models, Animal
- Dishevelled Proteins
- Endocytosis
- Frizzled Receptors/metabolism
- Genes, Reporter
- Green Fluorescent Proteins/genetics
- Green Fluorescent Proteins/metabolism
- Humans
- Hypertrophy
- Luminescent Proteins/genetics
- Luminescent Proteins/metabolism
- Mice
- Mice, Inbred mdx
- Mice, Knockout
- Mice, Transgenic
- Muscle Strength
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiopathology
- Muscle, Skeletal/surgery
- Muscular Dystrophies/genetics
- Muscular Dystrophies/metabolism
- Muscular Dystrophies/pathology
- Muscular Dystrophies/physiopathology
- Muscular Dystrophies/surgery
- Myoblasts, Skeletal/metabolism
- Myoblasts, Skeletal/pathology
- Myoblasts, Skeletal/transplantation
- Neuropeptides/metabolism
- PAX7 Transcription Factor/genetics
- Phosphoproteins/metabolism
- Promoter Regions, Genetic
- Receptors, G-Protein-Coupled/deficiency
- Receptors, G-Protein-Coupled/genetics
- Recombinant Fusion Proteins/metabolism
- Signal Transduction
- Wnt Proteins/genetics
- Wnt Proteins/metabolism
- rac1 GTP-Binding Protein/metabolism
- Red Fluorescent Protein
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Affiliation(s)
- C. Florian Bentzinger
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
- Faculty of Medicine, Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Julia von Maltzahn
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
- Faculty of Medicine, Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Nicolas A. Dumont
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
- Faculty of Medicine, Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Danny A. Stark
- Division of Biological Sciences and Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, MO 65211
| | - Yu Xin Wang
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
- Faculty of Medicine, Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Kevin Nhan
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
- Faculty of Medicine, Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
| | - Jérôme Frenette
- Faculty of Medicine, Department of Rehabilitation, Laval University, Quebec City, QC G1V 4G2, Canada
| | - DDW Cornelison
- Division of Biological Sciences and Christopher S. Bond Life Sciences Center, University of Missouri, Columbia, MO 65211
| | - Michael A. Rudnicki
- Regenerative Medicine Program, Ottawa Hospital Research Institute, Ottawa, ON K1H 8L6, Canada
- Faculty of Medicine, Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada
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