Abstract
Pluripotent mesenchymal stem cells in bone marrow differentiate into adipocytes, osteoblasts and other cells1,2. Balanced cytodifferentiation of stem cells is essential for the formation and maintenance of bone marrow; however, the mechanisms that control this balance remain largely unknown. Whereas cytokines such as interleukin-1 (IL-1) and tumour-necrosis factor-α (TNF-α) inhibit adipogenesis3,4, the ligand-induced transcription factor peroxisome proliferator-activated receptor-γ5 (PPAR-γ), is a key inducer of adipogenesis. Therefore, regulatory coupling between cytokine- and PPAR-γ-mediated signals might occur during adipogenesis. Here we show that the ligand-induced transactivation function of PPAR-γ is suppressed by IL-1 and TNF-α, and that this suppression is mediated through NF-κB activated by the TAK1/TAB1/NF-κB-inducing kinase (NIK) cascade6,7,8,9, a downstream cascade associated with IL-1 and TNF-α signalling. Unlike suppression of the PPAR-γ transactivation function by mitogen-activated protein kinase-induced growth factor signalling through phosphorylation of the A/B domain10, NF-κB blocks PPAR-γ binding to DNA by forming a complex with PPAR-γ and its AF-1-specific co-activator PGC-2. Our results suggest that expression of IL-1 and TNF-α in bone marrow may alter the fate of pluripotent mesenchymal stem cells, directing cellular differentiation towards osteoblasts rather than adipocytes by suppressing PPAR-γ function through NF-κB activated by the TAK1/TAB1/NIK cascade.
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Acknowledgements
We thank S. Tanaka for discussions; R. Nakamura and H. Higuchi for manuscript preparation; Sankyo Pharmaceuticals for troglitazone; P. Chambon for the mouse RXR-α cDNA; and D. Turner for the RNAi vector. This work was supported in part by a Grant-in-Aid for Priority Areas from the Ministry of Education, Science, Sports and Culture of Japan (to S.K.).
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Suzawa, M., Takada, I., Yanagisawa, J. et al. Cytokines suppress adipogenesis and PPAR-γ function through the TAK1/TAB1/NIK cascade. Nat Cell Biol 5, 224–230 (2003). https://doi.org/10.1038/ncb942
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DOI: https://doi.org/10.1038/ncb942
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