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Papers In Press, published online ahead of print February 20, 2002
Biochemistry, University of Western Ontario, London, Ontario N6A 5C1
Corresponding Author: skerjanc{at}uwo.ca
Wnt1 and Wnt3a are signaling factors known to play a role in the induction of myogenesis in the myotome of the differentiating somite. Both factors may transduce their signal by a conserved pathway that leads to transcriptional regulation by
J. Biol. Chem, 10.1074/jbc.M112141200
Submitted on December 19, 2001
Revised on February 19, 2002
Accepted on February 20, 2002
-catenin is essential and sufficient for skeletal myogenesis in P19 cells
-catenin/Lef1. -catenin and Lef1 are found in the myotome prior to MyoD expression. We have utilized the P19 cell system to study the mechanisms by which Wnt3a may activate MyoD expression and subsequent skeletal muscle development. We have isolated P19 cell lines that stably express either Wnt3a or activated -catenin and found that aggregation of these cells results in the induction of myogenesis compared to control cells. Pax3, Gli2, Mox1 and Six1 were expressed during Wnt3a and -catenin–induced differentiation prior to MyoD expression. Further, we have shown that the nuclear function of -catenin was essential for skeletal myogenesis in P19 cells by overexpression of a dominant negative -catenin/engrailed chimera. Primitive streak factors were present, but expression of Pax3, Mox1, Gli2 and Six1 was lost in these cells, indicating that nuclear -catenin is essential for specification of mesodermal precursors to the myogenic lineage. Therefore Wnt signaling, acting via -catenin, is necessary and sufficient for skeletal myogenesis in P19 cells.
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