Linked Life Data

16729973

Source:http://linkedlifedata.com/resource/pubmed/id/16729973

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2006-6-12
pubmed:abstractText
Terminal differentiation of skeletal myoblasts involves alignment of the mononucleated cells, fusion into multinucleated syncitia, and transcription of muscle-specific genes. Myogenesis in vivo is regulated partially by IGF-I initiated signaling that results in activation of an intracellular phosphatidylinositol 3 kinase (PI3K) signaling cascade. Downstream signaling through the Raf/MEK/ERK axis, a pathway initiated by IGF-I, also is implicated in the regulation of muscle formation. The involvement of ERK1 and ERK2 during myogenesis was examined in C2C12 myoblasts. C2C12 myoblasts stably expressing a small interfering RNA (siRNA) directed against ERK1 or ERK2 were created. Both of the kinases were reduced to trace levels as measured by Western for total ERK and retained the capacity to become phosphorylated. C2C12siERK2 knockdown myoblasts failed to fuse into multinucleated myofibers. By contrast, cells expressing a scrambled siRNA or ERK1 siRNA fused into large multinucleated structures. The block to muscle formation did not involve continued cell cycle progression or apoptosis. C2C12siERK1 myoblasts expressed an increased amount of ERK2 protein and formed larger myofibers in response to IGF-I treatment. Interestingly, IGF-I treatment of C2C12 ERK2 knockdown myoblasts did not reinstate the myogenic program arguing that ERK2 is required for differentiation. These results provide evidence for ERK2 as a positive regulator of myogenesis and suggest that ERK1 is dispensable for myoblast proliferation and differentiation.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0006-291X
pubmed:author
pubmed:issnType
Print
pubmed:day
14
pubmed:volume
345
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1425-33
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
ERK2 is required for efficient terminal differentiation of skeletal myoblasts.
pubmed:affiliation
Department of Animal Sciences, University of Florida, Gainesville, 32611, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, N.I.H., Extramural