Ursolic Acid Suppresses Interleukin-17 (IL-17) Production by Selectively Antagonizing the Function of RORγt Protein*
Tao Xu‡,1, Xiaohu Wang§,1,2, Bo Zhong§, Roza I. Nurieva§,3, Sheng Ding‡,4 and Chen Dong§,5
+ Author Affiliations
From the ‡Gladstone Institute of Cardiovascular Disease, Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
the §Department of Immunology and Center for Inflammation and Cancer, M.D. Anderson Cancer Center, Houston, Texas 77030
↵4 Supported by funding from the National Institutes of Health through NICHD, NHLBI, and the National Institute of Mental Health, the California Institute for Regenerative Medicine, the Prostate Cancer Foundation, Fate Therapeutics, the Esther B. O'Keeffe Foundation, and the Scripps Research Institute. To whom correspondence may be addressed. E-mail:
[email protected].
↵5 Supported by grants from the National Institutes of Health through NIAMS, the Leukemia and Lymphoma, Society, and the M.D. Anderson Cancer Center. To whom correspondence may be addressed. E-mail:
[email protected].
↵1 Both authors contributed equally to this work.
Abstract
Th17 cells have recently emerged as a major player in inflammatory and autoimmune diseases via the production of pro-inflammatory cytokines IL-17, IL-17F, and IL-22. The differentiation of Th17 cells and the associated cytokine production is directly controlled by RORγt. Here we show that ursolic acid (UA), a small molecule present in herbal medicine, selectively and effectively inhibits the function of RORγt, resulting in greatly decreased IL-17 expression in both developing and differentiated Th17 cells. In addition, treatment with UA ameliorated experimental autoimmune encephalomyelitis. The results thus suggest UA as a valuable drug candidate or leading compound for developing treatments of Th17-mediated inflammatory diseases and cancer.
Cytokine Immunology Inflammation Nuclear Receptors Transcription Regulation RORg Th17
Footnotes
↵2 Recipient of a National Multiple Sclerosis Society (NMSS) postdoctoral fellowship.
↵3 Supported by NIH through NIAID.
↵* A patent disclosure has been filed by M.D. Anderson Cancer Center based on the results of this paper.
↵ The on-line version of this article (available at
Invalid Link Removed) contains supplemental Figs. S1 and S2.
Received April 12, 2011.
Revision received May 4, 2011.
© 2011 by The American Society for Biochemistry and Molecular Biology, Inc.
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