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Carlson, B.A.* ; Yoo, M.H.* ; Conrad, M. ; Gladyshev, V.N.* ; Hatfield, D.L.* ; Park, J.M.*

Protein kinase-regulated expression and immune function of thioredoxin reductase 1 in mouse macrophages.

Mol. Immunol. 49, 311-316 (2011)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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Macrophages exposed to lipopolysaccharide (LPS) exhibit radical changes in mRNA and protein profiles. This shift in gene expression is geared not only to activate immune effector and regulatory mechanisms, but also to adjust the immune cell's metabolism to new physiological demands. However, it remains largely unknown whether immune function and metabolic state are mutually regulatory and, if so, how they are mechanistically interrelated in macrophages. Selenium, a dietary trace element exerting pleiotropic effects on immune homeostasis, and selenium-containing proteins (selenoproteins) may play a role in such coordination. We examined the incorporation of radiolabeled selenium into protein during LPS stimulation, and identified thioredoxin reductase 1 (TR1) as the only LPS-inducible selenoprotein in macrophages. TR1 induction occurred at the transcriptional level and depended on the intracellular signaling pathways mediated by p38 MAP kinase and IκB kinase. Macrophage-specific ablation of TR1 in mice resulted in a drastic decrease in the expression of VSIG4, a B7 family protein known to suppress T cell activation. These results reveal TR1 as both a regulator and a regulated target in the macrophage gene expression network, and suggest a link between selenium metabolism and immune signaling.

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