| Reference: | Proc Natl Acad Sci U S A. 2010 Jun 8;107(23):10626-31. Epub 2010 May 24. | |
| Authors: | Vanessa Núñeza,1, Daniel Alamedaa,1, Daniel Ricoa,2, Rubén Motab, Pilar Gonzalob, Marta Cedenillaa, Thierry Fischerc, Lisardo Boscád, Christopher K. Glasse, Alicia G. Arroyob, and Mercedes Ricotea,3 Departments of aRegenerative Cardiology and bVascular Biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid 28029, Spain; cDepartment of Immunology and Oncology, Centro Nacional de Biotecnología, Madrid 28049, Spain; dInstituto de Investigaciones Biomédicas “Alberto Sols” (CSIC-UAM), Madrid 28029, Spain; and eDepartment of Medicine, Department of Cellular and Molecular Medicine, University of California,La Jolla, CA 92093 1V.N. and D.A. contributed equally to this work. 2Present address: Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, Madrid 28029, Spain. 3To whom correspondence should be addressed. E-mail: mricote@cnic.es. |
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| Summary: | The retinoid X receptor α (RXRα) plays a central role in the regulation of many intracellular receptor signaling pathways and can mediate ligand-dependent transcription by forming homodimers or heterodimers with other nuclear receptors. Although several members of the nuclear hormone receptor superfamily have emerged as important regulators of macrophage gene expression, the existence in vivo of an RXR signaling pathway in macrophages has not been established. Here, we provide evidence that RXRα regulates the transcription of the chemokines Ccl6 and Ccl9 in macrophages independently of heterodimeric partners. Mice lacking RXRα in myeloid cells exhibit reduced levels of CCL6 and CCL9, impaired recruitment of leukocytes to sites of inflammation and lower susceptibility to sepsis. These studies demonstrate that macrophage RXRα plays key roles in the regulation of innate immunity and represents a potential target for immunotherapy of sepsis. | |
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