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Mol Cell Biol. 1991 July; 11(7): 3795-3803

Secretion and transcriptional regulation of transforming growth factor-beta 3 during myogenesis.

R Lafyatis, R Lechleider, A B Roberts and M B Sporn

Laboratory of Chemoprevention, National Cancer Institute, Bethesda, Maryland 20892.

ABSTRACT

Transforming growth factor-beta 3 (TGF-beta 3) mRNA is differentially expressed in developing and mature mouse tissues, including high-level expression in developing and adult cardiac tissue. We show now that TGF-beta 3 mRNA is also expressed highly in skeletal muscle as well as in the mouse skeletal myoblast cell line C2C12. We also show that C2C12 cells secrete TGF-beta 3, and that this TGF-beta is able to inhibit C2C12 myoblast fusion after activation. In order to begin to understand how the TGF-beta 3 promoter is regulated in specific tissues during development, we therefore studied the regulation of TGF-beta 3 during myoblast fusion. After fusion of C2C12 cells into myotubes, TGF-beta 3 mRNA levels increased eightfold as a result of increased TGF-beta 3 transcription. TGF-beta 3 transcriptional regulation was studied in myoblasts and myotubes by transfection of chimeric TGF-beta 3/CAT promoter plasmids. Chloramphenicol acetyltransferase (CAT) activity was stimulated in myoblasts by several upstream regions between -301 and -47 of the TGF-beta 3 promoter and by the TGF-beta 3 5' untranslated region. CAT activity directed by the TGF-beta 3 promoter in myotubes was stimulated by a distinct upstream region located between -499 and -221. Therefore, the high level of TGF-beta 3 mRNA expression in muscle cells appears to be dependent on multiple regulatory events during different stages of myogenesis.

Mol Cell Biol. 1991 July; 11(7): 3795-3803




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