Published August 13, 2012 Article miR-146a controls the resolution of T cell responses in mice Lili Yang,1 Mark P. Boldin,2 Yang Yu,1 Claret Siyuan Liu,1 Chee-Kwee Ea,3 Parameswaran Ramakrishnan,1 Konstantin D. Taganov,4 Jimmy L. Zhao,1 and David Baltimore1 1Division of Biology, California Institute of Technology, Pasadena, CA 91125 2Department of Molecular and Cellular Biology, Beckman Research Institute, City of Hope, Duarte, CA 91010 3Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia 4EMD Millipore, Temecula, CA 92590 T cell responses in mammals must be tightly regulated to both provide effective immune protection and avoid inflammation-induced pathology. NF-B activation is a key signaling Downloaded from event induced by T cell receptor (TCR) stimulation. Dysregulation of NF-B is associated with T cell–mediated inflammatory diseases and malignancies, highlighting the importance of negative feedback control of TCR-induced NF-B activity. In this study we show that in mice, T cells lacking miR-146a are hyperactive in both acute antigenic responses and chronic inflammatory autoimmune responses. TCR-driven NF-B activation up-regulates the expression of miR-146a, which in turn down-regulates NF-B activity, at least partly jem.rupress.org through repressing the NF-B signaling transducers TRAF6 and IRAK1. Thus, our results identify miR-146a as an important new member of the negative feedback loop that con- trols TCR signaling to NF-B. Our findings also add microRNA to the list of regulators that control the resolution of T cell responses. on October 20, 2014 CORRESPONDENCE T cells of the adaptive immune system in mam- from the past two decades have identified multi- Lili Yang: mals play a central role in the fight against patho- ple layers of modulation that contribute to this
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