Leukemia Inhibitory Factor and Its Receptor Promote Adipocyte Differentiation via the Mitogen-activated Protein Kinase Cascade

• Published in: The Journal of biological chemistry Vol. 274; no. 35; pp. 24965 - 24972
• Main Authors: Aubert, Jerome, Dessolin, Sophie, Belmonte, Nathalie, Li, Meng, McKenzie, Fergus R., Staccini, Laurence, Villageois, Phi, Barhanin, Brigitte, Vernallis, Ann, Smith, Austin G., Ailhaud, Gérard, Dani, Christian
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 27.08.1999; American Society for Biochemistry and Molecular Biology
• Subjects: Adipocytes - cytology; Adipocytes - metabolism; Animals; CCAAT-Enhancer-Binding Protein-delta; CCAAT-Enhancer-Binding Proteins; Cell Differentiation; DNA-Binding Proteins - genetics; Enzyme Activation; Flavonoids - pharmacology; Gene Expression Regulation, Developmental; Growth Inhibitors - genetics; Growth Inhibitors - metabolism; Interleukin-6; Leukemia Inhibitory Factor; Leukemia Inhibitory Factor Receptor alpha Subunit; Lymphokines - genetics; Lymphokines - metabolism; Mice; Mice, Knockout; Mitogen-Activated Protein Kinase 1 - metabolism; Nuclear Proteins - genetics; Receptors, Cytokine - genetics; Receptors, Cytokine - metabolism; Receptors, OSM-LIF; RNA, Messenger - metabolism; Signal Transduction; Stem Cells - metabolism; Transcription Factors
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.274.35.24965

Extracellular factors and intracellular signaling pathways involved in early events of adipocyte differentiation are poorly defined. It is shown herein that expression of leukemia inhibitory factor (LIF) and LIF receptor is developmentally regulated during adipocyte differentiation. Preadipocytes secrete bioactive LIF, and an antagonist of LIF receptor inhibits adipogenesis. Genetically modified embryonic stem (ES) cells combined with culture conditions to commit stem cells into the adipocyte lineage were used to examine the requirement of LIF receptor during in vitro development of adipose cells. The capacity of embryoid bodies derived from lifr−/− ES cells to undergo adipocyte differentiation is dramatically reduced. LIF addition stimulates adipocyte differentiation of Ob1771 and 3T3-F442A preadipocytes and that of peroxisome proliferator-activated receptor γ2 ligand-treated mouse embryonic fibroblasts. Expression of the early adipogenic transcription factors C/EBPβ and C/EBPδ is rapidly stimulated following exposure of preadipose cells to LIF. The selective inhibitors of mitogen-activated protein kinase kinase, i.e. PD98059 and U0126, inhibit LIF-induced C/EBP gene expression and prevent adipocyte differentiation induced by LIF. These results are in favor of a model that implicates stimulation of LIF receptor in the commitment of preadipocytes to undergo terminal differentiation by controlling the early expression of C/EBPβ and C/EBPδ genes via the mitogen-activated protein kinase cascade.