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Chronic innate immune activation of TBK1 suppresses mTORC1 activity and dysregulates cellular metabolism.

Identifieur interne : 000894 ( Main/Exploration ); précédent : 000893; suivant : 000895

Chronic innate immune activation of TBK1 suppresses mTORC1 activity and dysregulates cellular metabolism.

Auteurs : Maroof Hasan [États-Unis] ; Vijay K. Gonugunta [États-Unis] ; Nicole Dobbs [États-Unis] ; Aktar Ali [États-Unis] ; Guillermo Palchik [États-Unis] ; Maria A. Calvaruso [États-Unis] ; Ralph J. Deberardinis [États-Unis] ; Nan Yan [États-Unis]

Source :

RBID : pubmed:28069950

Descripteurs français

English descriptors

Abstract

Three-prime repair exonuclease 1 knockout (Trex1-/-) mice suffer from systemic inflammation caused largely by chronic activation of the cyclic GMP-AMP synthase-stimulator of interferon genes-TANK-binding kinase-interferon regulatory factor 3 (cGAS-STING-TBK1-IRF3) signaling pathway. We showed previously that Trex1-deficient cells have reduced mammalian target of rapamycin complex 1 (mTORC1) activity, although the underlying mechanism is unclear. Here, we performed detailed metabolic analysis in Trex1-/- mice and cells that revealed both cellular and systemic metabolic defects, including reduced mitochondrial respiration and increased glycolysis, energy expenditure, and fat metabolism. We also genetically separated the inflammatory and metabolic phenotypes by showing that Sting deficiency rescued both inflammatory and metabolic phenotypes, whereas Irf3 deficiency only rescued inflammation on the Trex1-/- background, and many metabolic defects persist in Trex1-/-Irf3-/- cells and mice. We also showed that Leptin deficiency (ob/ob) increased lipogenesis and prolonged survival of Trex1-/- mice without dampening inflammation. Mechanistically, we identified TBK1 as a key regulator of mTORC1 activity in Trex1-/- cells. Together, our data demonstrate that chronic innate immune activation of TBK1 suppresses mTORC1 activity, leading to dysregulated cellular metabolism.

DOI: 10.1073/pnas.1611113114
PubMed: 28069950
PubMed Central: PMC5278463


Affiliations:


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<term>Fats (metabolism)</term>
<term>Female (MeSH)</term>
<term>Glycolysis (physiology)</term>
<term>Immunity, Innate (immunology)</term>
<term>Inflammation (immunology)</term>
<term>Inflammation (metabolism)</term>
<term>Interferon Regulatory Factor-3 (metabolism)</term>
<term>Male (MeSH)</term>
<term>Mechanistic Target of Rapamycin Complex 1 (metabolism)</term>
<term>Membrane Proteins (metabolism)</term>
<term>Mice (MeSH)</term>
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<term>Mitochondria (metabolism)</term>
<term>Nucleotides, Cyclic (metabolism)</term>
<term>Protein-Serine-Threonine Kinases (immunology)</term>
<term>Protein-Serine-Threonine Kinases (metabolism)</term>
<term>Signal Transduction (immunology)</term>
<term>Signal Transduction (physiology)</term>
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<term>Animaux (MeSH)</term>
<term>Complexe-1 cible mécanistique de la rapamycine (métabolisme)</term>
<term>Facteur-3 de régulation d'interféron (métabolisme)</term>
<term>Femelle (MeSH)</term>
<term>Glycolyse (physiologie)</term>
<term>Immunité innée (immunologie)</term>
<term>Inflammation (immunologie)</term>
<term>Inflammation (métabolisme)</term>
<term>Matières grasses (métabolisme)</term>
<term>Mitochondries (métabolisme)</term>
<term>Mâle (MeSH)</term>
<term>Métabolisme énergétique (physiologie)</term>
<term>Nucléotides cycliques (métabolisme)</term>
<term>Protein-Serine-Threonine Kinases (immunologie)</term>
<term>Protein-Serine-Threonine Kinases (métabolisme)</term>
<term>Protéines membranaires (métabolisme)</term>
<term>Souris (MeSH)</term>
<term>Souris de lignée C57BL (MeSH)</term>
<term>Transduction du signal (immunologie)</term>
<term>Transduction du signal (physiologie)</term>
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<term>Interferon Regulatory Factor-3</term>
<term>Mechanistic Target of Rapamycin Complex 1</term>
<term>Membrane Proteins</term>
<term>Nucleotides, Cyclic</term>
<term>Protein-Serine-Threonine Kinases</term>
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<term>Immunité innée</term>
<term>Inflammation</term>
<term>Protein-Serine-Threonine Kinases</term>
<term>Transduction du signal</term>
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<term>Immunity, Innate</term>
<term>Inflammation</term>
<term>Signal Transduction</term>
</keywords>
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<term>Inflammation</term>
<term>Mitochondria</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr">
<term>Complexe-1 cible mécanistique de la rapamycine</term>
<term>Facteur-3 de régulation d'interféron</term>
<term>Inflammation</term>
<term>Matières grasses</term>
<term>Mitochondries</term>
<term>Nucléotides cycliques</term>
<term>Protein-Serine-Threonine Kinases</term>
<term>Protéines membranaires</term>
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<term>Femelle</term>
<term>Mâle</term>
<term>Souris</term>
<term>Souris de lignée C57BL</term>
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<front>
<div type="abstract" xml:lang="en">Three-prime repair exonuclease 1 knockout (Trex1
<sup>-/-</sup>
) mice suffer from systemic inflammation caused largely by chronic activation of the cyclic GMP-AMP synthase-stimulator of interferon genes-TANK-binding kinase-interferon regulatory factor 3 (cGAS-STING-TBK1-IRF3) signaling pathway. We showed previously that Trex1-deficient cells have reduced mammalian target of rapamycin complex 1 (mTORC1) activity, although the underlying mechanism is unclear. Here, we performed detailed metabolic analysis in Trex1
<sup>-/-</sup>
mice and cells that revealed both cellular and systemic metabolic defects, including reduced mitochondrial respiration and increased glycolysis, energy expenditure, and fat metabolism. We also genetically separated the inflammatory and metabolic phenotypes by showing that Sting deficiency rescued both inflammatory and metabolic phenotypes, whereas Irf3 deficiency only rescued inflammation on the Trex1
<sup>-/-</sup>
background, and many metabolic defects persist in Trex1
<sup>-/-</sup>
Irf3
<sup>-/-</sup>
cells and mice. We also showed that Leptin deficiency (ob/ob) increased lipogenesis and prolonged survival of Trex1
<sup>-/-</sup>
mice without dampening inflammation. Mechanistically, we identified TBK1 as a key regulator of mTORC1 activity in Trex1
<sup>-/-</sup>
cells. Together, our data demonstrate that chronic innate immune activation of TBK1 suppresses mTORC1 activity, leading to dysregulated cellular metabolism.</div>
</front>
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<Issue>4</Issue>
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<Title>Proceedings of the National Academy of Sciences of the United States of America</Title>
<ISOAbbreviation>Proc Natl Acad Sci U S A</ISOAbbreviation>
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<ArticleTitle>Chronic innate immune activation of TBK1 suppresses mTORC1 activity and dysregulates cellular metabolism.</ArticleTitle>
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</Pagination>
<ELocationID EIdType="doi" ValidYN="Y">10.1073/pnas.1611113114</ELocationID>
<Abstract>
<AbstractText>Three-prime repair exonuclease 1 knockout (Trex1
<sup>-/-</sup>
) mice suffer from systemic inflammation caused largely by chronic activation of the cyclic GMP-AMP synthase-stimulator of interferon genes-TANK-binding kinase-interferon regulatory factor 3 (cGAS-STING-TBK1-IRF3) signaling pathway. We showed previously that Trex1-deficient cells have reduced mammalian target of rapamycin complex 1 (mTORC1) activity, although the underlying mechanism is unclear. Here, we performed detailed metabolic analysis in Trex1
<sup>-/-</sup>
mice and cells that revealed both cellular and systemic metabolic defects, including reduced mitochondrial respiration and increased glycolysis, energy expenditure, and fat metabolism. We also genetically separated the inflammatory and metabolic phenotypes by showing that Sting deficiency rescued both inflammatory and metabolic phenotypes, whereas Irf3 deficiency only rescued inflammation on the Trex1
<sup>-/-</sup>
background, and many metabolic defects persist in Trex1
<sup>-/-</sup>
Irf3
<sup>-/-</sup>
cells and mice. We also showed that Leptin deficiency (ob/ob) increased lipogenesis and prolonged survival of Trex1
<sup>-/-</sup>
mice without dampening inflammation. Mechanistically, we identified TBK1 as a key regulator of mTORC1 activity in Trex1
<sup>-/-</sup>
cells. Together, our data demonstrate that chronic innate immune activation of TBK1 suppresses mTORC1 activity, leading to dysregulated cellular metabolism.</AbstractText>
</Abstract>
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</AffiliationInfo>
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