title: Brief report: Blockade of Notch signaling in muscle stem cells causes muscular dystrophic phenotype and impaired muscle regeneration.
abstract: Muscular dystrophies are a group of devastating diseases characterized by progressive muscle weakness and degeneration, with etiologies including muscle gene mutations and regenerative defects of muscle stem cells. Notch signaling is critical for skeletal myogenesis and has important roles in maintaining the muscle stem cell pool and preventing premature muscle differentiation. To investigate the functional impact of Notch signaling blockade in muscle stem cells, we developed a conditional knock-in mouse model in which endogenous Notch signaling is specifically blocked in muscle stem cell compartment. Mice with Notch signaling inhibition in muscle stem cells showed several muscular dystrophic features and impaired muscle regeneration. Analyses of satellite cells and isolated primary myoblasts revealed that Notch signaling blockade in muscle stem cells caused reduced activation and proliferation of satellite cells but enhanced differentiation of myoblasts. Our data thus indicate that Notch signaling controls processes that are critical to regeneration in muscular dystrophy, suggesting that Notch inhibitor therapies could have potential side effects on muscle functions.
authors: Department of Molecular Genetics and Microbiology, Shands Cancer Center, University of Florida, Gainesville, Florida 32610-3633, USA.
authors: Shuibin
authors: S
authors: Lin
authors: Huangxuan
authors: H
authors: Shen
authors: Baofeng
authors: B
authors: Jin
authors: Yumei
authors: Y
authors: Gu
authors: Zirong
authors: Z
authors: Chen
authors: Chunxia
authors: C
authors: Cao
authors: Chengbin
authors: C
authors: Hu
authors: Charles
authors: C
authors: Keller
authors: Warren S
authors: WS
authors: Pear
authors: Lizi
authors: L
authors: Wu
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology; D051379:Mice; D018345:Mice, Knockout; D032342:Muscle Cells / Q000166:cytology* / Q000378:metabolism*; D024510:Muscle Development / Q000235:genetics / Q000502:physiology*; D009136:Muscular Dystrophies / Q000235:genetics / Q000378:metabolism*; D032446:Myoblasts / Q000166:cytology / Q000378:metabolism; D051880:Receptors, Notch / Q000235:genetics / Q000378:metabolism*; D032496:Satellite Cells, Skeletal Muscle / Q000166:cytology / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology; D013234:Stem Cells / Q000166:cytology* / Q000378:metabolism*
chemical_list: D051880:Receptors, Notch