Altered primary and secondary myogenesis in the myostatin-null mouse.
Skeletal muscle fiber generation occurs principally in two myogenic phases: (1) Primary (embryonic) myogenesis when myoblasts proliferate and fuse to form primary myotubes and (2) secondary (fetal) myogenesis when successive waves of myoblasts fuse along the surface of the primary myotubes, giving r...
| Publicado en: | Rejuvenation Research Vol. 13; no. 6; pp. 717 - 728 |
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| Autores principales: | , , , , , , , , , |
| Formato: | research Journal Article |
| Publicado: |
Mary Ann Liebert, Inc.
Dec2010
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105002072&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105002072 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15491684 1E3T jtl: Rejuvenation Research issn: 15491684 maglogo: N pubinfo: dt: Dec2010 vid: 13 iid: 6 pid: 1365 pub: Mary Ann Liebert, Inc. place: New Rochelle, New York artinfo: ui: 105002072 NLM21204650 2010926368 10.1089/rej.2010.1065 NLM21204650 105002072 ppf: 717 ppct: 11 formats: tig: atl: Altered primary and secondary myogenesis in the myostatin-null mouse. aug: au: Matsakas A Otto A Elashry MI Brown SC Patel K Matsakas, Antonios Otto, Anthony Elashry, Mohamed I Brown, Susan C Patel, Ketan affil: School of Biological Sciences, University of Reading, Reading, United Kingdom sug: subj: Intercellular Signaling Peptides and Proteins Deficiency Musculoskeletal System Embryology Myostatin Animal Studies Body Weight Cell Differentiation Cell Physiology Cells Embryo Metabolism Embryo Pathology Hyperplasia Hypertrophy Immunohistochemistry Intercellular Signaling Peptides and Proteins Metabolism Mice Muscle Proteins Metabolism Muscle, Skeletal Metabolism Muscle, Skeletal Pathology Oxidation-Reduction Proteins Metabolism ab: Skeletal muscle fiber generation occurs principally in two myogenic phases: (1) Primary (embryonic) myogenesis when myoblasts proliferate and fuse to form primary myotubes and (2) secondary (fetal) myogenesis when successive waves of myoblasts fuse along the surface of the primary myotubes, giving rise to a population of smaller and more numerous secondary myotubes. This sequence of events determines fiber number and is completed at or soon after birth in most muscles of the mouse. The adult myostatin null mouse (MSTN(-/-)) displays both an increase in fiber number and size relative to wild type (MSTN(+/+)), suggesting a developmental origin for the hypermuscular phenotype. The focus of the present study was to determine at which point during myogenesis do MSTN(-/-) animals diverge from MSTN(+/+). To achieve this, we focused on the extensor digitorum longus (EDL) muscle and evaluated primary myotube number at embryonic day (E) 13.0 and E14.5 and secondary to primary myotube ratios at E18.5. We show that primary myotube number and size were significantly increased in the MSTN(-/-) mice by E14.5 and the secondary to primary myotube ratio increased at E18.5. This increase in the rate of fiber formation resulted in MSTN(-/-) mice harboring 87% of their final adult fiber number at E18.5, compared to only 73% in MSTN(+/+). An accelerated myogenic program in the MSTN(-/-) mice was further confirmed by our finding of an initial expansion in the myogenic stem cell (identified through Pax7 expression) and myoblast (identified through myogenin expression) cell pools at E14.5 in the EDL muscle of these animals that was, however, followed by a reduction of both populations of cells at E18.5 relative to MSTN(+/+). Overall these data suggest that the genetic loss of myostatin accelerates the developmental myogenic program of primary and secondary skeletal myogenesis. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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