Abstract
The ligation of Toll-like receptors (TLRs) leads to rapid activation of dendritic cells (DCs). However, the metabolic requirements that support this process remain poorly defined. We found that DC glycolytic flux increased within minutes of exposure to TLR agonists and that this served an essential role in supporting the de novo synthesis of fatty acids for the expansion of the endoplasmic reticulum and Golgi required for the production and secretion of proteins that are integral to DC activation. Signaling via the kinases TBK1, IKKɛ and Akt was essential for the TLR-induced increase in glycolysis by promoting the association of the glycolytic enzyme HK-II with mitochondria. In summary, we identified the rapid induction of glycolysis as an integral component of TLR signaling that is essential for the anabolic demands of the activation and function of DCs.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Cell Differentiation / drug effects
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Cell Differentiation / genetics
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Cells, Cultured
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Dendritic Cells / immunology*
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Fatty Acids / biosynthesis
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Glycolysis* / drug effects
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Glycolysis* / genetics
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Glycolysis* / immunology
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Hexokinase / metabolism
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I-kappa B Kinase / genetics
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I-kappa B Kinase / metabolism*
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Lipopolysaccharides / immunology
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Lipopolysaccharides / pharmacology
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Lymphocyte Activation / drug effects
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Mice
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Mice, Inbred C57BL
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Mice, Knockout
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Mice, Transgenic
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Protein Serine-Threonine Kinases / genetics
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Protein Serine-Threonine Kinases / metabolism*
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Proto-Oncogene Proteins c-akt / metabolism
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RNA, Small Interfering / genetics
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Signal Transduction / drug effects
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Signal Transduction / genetics
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T-Lymphocytes / immunology*
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Toll-Like Receptors / agonists
Substances
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Fatty Acids
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Lipopolysaccharides
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RNA, Small Interfering
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Toll-Like Receptors
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Tbk1 protein, mouse
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Hexokinase
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Protein Serine-Threonine Kinases
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Proto-Oncogene Proteins c-akt
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I-kappa B Kinase