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J Biol Chem, Vol. 274, Issue 22, 15395-15400, May 28, 1999

Neuregulin Stimulates Myogenic Differentiation in an Autocrine Manner

Daegun KimDagger , Susun ChiDagger , Kun Ho LeeDagger , Sangmyung RheeDagger , Yunhee Kim Kwon§, Chin Ha ChungDagger , Hyockman Kwon, and Man-Sik KangDagger

From the Dagger  Department of Molecular Biology and Research Center for Cell Differentiation, Seoul National University, Seoul 151-742, the § Department of Biology, Kyung Hee University, Seoul 130-701, and the  Department of Molecular Biology, Dankook University, 8 Hannam-dong Yongsan-gu, Seoul 140-714, Korea

During myogenesis, mononucleated myoblasts form multinucleated myotubes by membrane fusion. Efficiency of this intercellular process can be maximized by a simultaneous progress, with a time window, of other neighboring myoblasts in the differentiation program. This phenomenon has been described as the community effect. It proposes the existence of a molecule that acts as a differentiation-inducing signal to a group of identical cells. Here ,we show that neuregulin is a strong candidate for this molecule in myoblast differentiation. The expression of neuregulin increased rapidly but transiently at early stage of differentiation of rat L6 cells. Neuregulin showed a potent differentiation-promoting activity in membrane fusion and expression of myosin heavy chain. The antibodies raised against neuregulin and its cognate receptor ErbB3, which were capable of neutralizing the signal pathway, inhibited myotube formation and expression of myosin heavy chain in both L6 cells and primary rat myoblasts. The progress of differentiation was mostly halted after the expression of myogenin and cell cycle arrest. These results suggest that the activation of an autocrine signaling of neuregulin may provide a basic mechanism for the community effect observed in the differentiation of the embryonic muscle cells.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.


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