Abstract
The peroxisome proliferator-activated receptor-γ (PPAR-γ) is a ligand-dependent nuclear receptor that has been implicated in the modulation of critical aspects of development and homeostasis, including adipocyte differentiation1, glucose metabolism2,3 and macrophage development and function4,5,6. PPAR-γ is activated by a range of synthetic and naturally occurring substances, including antidiabetic thiazolidinediones2,3, polyunsaturated fatty acids7, 15-deoxy-Δ12,14prostaglandin J2 (refs 8, 9) and components of oxidized low-density lipoprotein, such as 13-hydroxyoctadecadienoic acid (13-HODE) and 15-hydroxyeicosatetraenoic acid (15-HETE)10. However, the identities of endogenous ligands for PPAR-γ and their means of production in vivo have not been established. In monocytes and macrophages, 13-HODE and 15-HETE can be generated from linoleic and arachidonic acids, respectively, by a 12/15-lipoxygenase that is upregulated by the TH2-derived cytokine interleukin-4 (ref. 11). Here we show that interleukin-4 also induces the expression of PPAR-γ and provide evidence that the coordinate induction of PPAR-γ and 12/15-lipoxygenase mediates interleukin-4-dependent transcription of the CD36 gene in macrophages. These findings reveal a physiological role of 12/15-lipoxygenase in the generation of endogenous ligands for PPAR-γ, and suggest a paradigm for the regulation of nuclear receptor function by cytokines.
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Acknowledgements
We thank S. Blanchard (Glaxo Wellcome) for communicating results of the characterization of GW9662 before publication; T. Schneiderman for assistance with manuscript preparation; and J. Barnett for assistance in preparation of human peripheral blood monocytes. J.T.H. is supported by an NIH Postdoctoral Fellowship. J.S.W. is supported by an NIH Medical Scientist Training Program Grant to U. C. San Diego. M.R. is supported by a Postdoctoral Fellowship from the American Heart Association. C.J.K. and D.C. are clinical investigators of the Medical Research Service, Department of Veterans Affairs. C.K.G. is an Established Investigator of the American Heart Association. These studies were also supported by NIH grants to C.D.F. and C.K.G. and a Specialized Center of Research Grant in Atherosclerosis to J.L.W. and C.K.G.
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Huang, J., Welch, J., Ricote, M. et al. Interleukin-4-dependent production of PPAR-γ ligands in macrophages by 12/15-lipoxygenase. Nature 400, 378–382 (1999). https://doi.org/10.1038/22572
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DOI: https://doi.org/10.1038/22572
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