Altered primary and secondary myogenesis in the myostatin-null mouse.

Abstract:

: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.

journal_name

Rejuvenation Res

journal_title

Rejuvenation research

authors

Matsakas A,Otto A,Elashry MI,Brown SC,Patel K

doi

10.1089/rej.2010.1065

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

717-27

issue

6

eissn

1549-1684

issn

1557-8577

journal_volume

13

pub_type

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