Roles of peroxisome proliferator-activated receptors delta and gamma in myoblast transdifferentiation

Research output: Contribution to journalJournal articlepeer-review

Dietary long chain fatty acids and thiazolidinediones act as potent activators of adipogenesis in established preadipose cell lines. High concentrations of thiazolidinediones have also been shown to induce terminal differentiation of non-preadipose cells, such as fibroblasts and myoblasts, into adipose-like cells. This transdifferentiation was observed in both rodent and human myoblasts. In this report, we show that PPARdelta mediates some of the effects exerted by long chain fatty acids on myogenesis and adipogenesis. Activation of PPARdelta by long chain fatty acids impairs the expression of the determination factor MyoD1 and alpha-actin, abolishes the development of multinucleated myotubes, and in parallel induces the expression of PPARgamma gene, a master regulator of adipogenesis. Ectopic expression of PPARdelta in C2C12 myoblasts potentiated the fatty acid-induced expression of adipogenic markers, while expression of a dominant negative PPARdelta mutant exerted opposite effects. Furthermore, a sequential activation of first PPARdelta with long chain fatty acids and then PPARgamma with thiazolidinediones is required for adipogenesis in C2C12 myoblasts. This study demonstrates that PPARdelta, at least in part, is responsible for the dual effects of long chain fatty acids as inhibitors of myogenesis and inducers of transdifferentiation into preadipose-like cells.
Original languageEnglish
JournalExperimental Cell Research
Issue number1
Pages (from-to)168-76
Number of pages8
Publication statusPublished - 2003
Externally publishedYes

Bibliographical note

Keywords: Adipocytes; Animals; Cell Differentiation; Cell Line; Fatty Acids; Gene Expression Regulation; Mice; Muscle Development; Mutation; MyoD Protein; Myoblasts; Receptors, Cytoplasmic and Nuclear; Transcription Factors; Transfection

ID: 11230725