LXR-Dependent Gene Expression Is Important for Macrophage Survival and the Innate Immune Response
2004; Cell Press; Volume: 119; Issue: 2 Linguagem: Inglês
10.1016/j.cell.2004.09.032
ISSN1097-4172
AutoresSean B. Joseph, Michelle N. Bradley, Antonio Castrillo, Kevin W. Bruhn, Puiying A. Mak, Liming Pei, John B. Hogenesch, Ryan M. O’Connell, Genhong Cheng, Enrique Sáez, Jeffery F. Miller, Peter Tontonoz,
Tópico(s)interferon and immune responses
ResumoThe liver X receptors (LXRs) are nuclear receptors with established roles in the regulation of lipid metabolism. We now show that LXR signaling not only regulates macrophage cholesterol metabolism but also impacts antimicrobial responses. Mice lacking LXRs are highly susceptible to infection with the intracellular bacteria Listeria monocytogenes (LM). Bone marrow transplant studies point to altered macrophage function as the major determinant of susceptibility. LXR-null macrophages undergo accelerated apoptosis when challenged with LM and exhibit defective bacterial clearance in vivo. These defects result, at least in part, from loss of regulation of the antiapoptotic factor SPα, a direct target for regulation by LXRα. Expression of LXRα or SPα in macrophages inhibits apoptosis in the setting of LM infection. Our results demonstrate that LXR-dependent gene expression plays an unexpected role in innate immunity and suggest that common nuclear receptor pathways mediate macrophage responses to modified lipoproteins and intracellular pathogens.
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