Abstract:
:IGF-I and its receptor IGF-IR are seen as critical effectors of muscle hypertrophy, a notion recently questioned. Using MKR transgenic mice that express a dominant negative IGF-IR only in skeletal muscle, we have examined the role of the IGF-IR signaling in differentiation and repair of muscle fibers after damage-induced muscle regeneration. This process is impaired in MKR muscle, with incomplete regeneration, persistence of infiltrating cells and sustained expression of differentiation markers. Analysis of MKR and WT muscle-derived progenitor stem cells and myoblasts showed twice as many such cells in MKR muscle and an incomplete in vitro differentiation, that is, despite similar levels of myogenin expression, the level of fusion of MKR myoblasts was significantly reduced in comparison to WT myoblasts. These data show IGF-IR signaling is not only required at early hyperplasia stages of muscle differentiation, but also for late stages of myofiber maturation and hypertrophy.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Heron-Milhavet L,Mamaeva D,LeRoith D,Lamb NJ,Fernandez Adoi
10.1002/jcp.22218subject
Has Abstractpub_date
2010-10-01 00:00:00pages
1-6issue
1eissn
0021-9541issn
1097-4652journal_volume
225pub_type
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