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Mol Cell Biol. 1994 December; 14(12): 8451-8459
Cellular aggregation enhances MyoD-directed skeletal myogenesis in embryonal carcinoma cells.
I S Skerjanc,
R S Slack and
M W McBurney
Department of Medicine, University of Ottawa, Ontario, Canada.
ABSTRACT
When introduced into P19 embryonal carcinoma cells, recombinant genes encoding MyoD converted only a small percentage (< 3%) of the transfected cells into skeletal muscle. We isolated stably transfected cells that expressed the MyoD transcript. These P19[MyoD] cells continued to express markers characteristic of undifferentiated stem cells but also expressed myf-5 and the myotonic dystrophy kinase, transcripts normally present in myoblasts but absent from P19 cells. Aggregation of P19[MyoD] cells induced the expression of myogenin, desmin, and the retinoblastoma protein and resulted in the rapid and abundant development of skeletal muscle. Both the embryonic and the slow isoforms of myosin heavy chain were present in this muscle, indicating that it resembled skeletal muscle formed from primary myoblasts. Since aggregation of P19 cells normally results in inefficient differentiation and the development of only low levels of cardiac muscle but no skeletal muscle, we conclude that MyoD imposes the skeletal muscle program on P19 cells and that the differentiation of these cells requires inductive events provided by cell aggregation.
Mol Cell Biol. 1994 December; 14(12): 8451-8459
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