DsbA-L prevents obesity-induced inflammation and insulin resistance by suppressing the mtDNA release-activated cGAS-cGAMP-STING pathway

Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation remain elusive. Here we show that obesity promotes mtDNA release into the cytosol, where it triggers inflammatory responses by activating the...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 114; no. 46; pp. 12196 - 12201
Main Authors Bai, Juli, Cervantes, Christopher, Liu, Juan, He, Sijia, Zhou, Haiyan, Zhang, Bilin, Cai, Huan, Yin, Dongqing, Hu, Derong, Li, Zhi, Chen, Hongzhi, Gao, Xiaoli, Wang, Fang, O’Connor, Jason C., Xu, Yong, Liu, Meilian, Dong, Lily Q., Liu, Feng
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 14.11.2017
Subjects
Online AccessGet full text
ISSN0027-8424
1091-6490
1091-6490
DOI10.1073/pnas.1708744114

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Abstract Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation remain elusive. Here we show that obesity promotes mtDNA release into the cytosol, where it triggers inflammatory responses by activating the DNA-sensing cGAS-cGAMP-STING pathway. Fat-specific knockout of disulfide-bond A oxidoreductase-like protein (DsbA-L), a chaperone-like protein originally identified in the mitochondrial matrix, impaired mitochondrial function and promoted mtDNA release, leading to activation of the cGAS-cGAMP-STING pathway and inflammatory responses. Conversely, fat-specific overexpression of DsbA-L protected mice against high-fat diet-induced activation of the cGAS-cGAMP-STING pathway and inflammation. Taken together, we identify DsbA-L as a key molecule that maintains mitochondrial integrity. DsbA-L deficiency promotes inflammation and insulin resistance by activating the cGAS-cGAMP-STING pathway. Our study also reveals that, in addition to its well-characterized roles in innate immune surveillance, the cGAS-cGAMP-STING pathway plays an important role in mediating obesity-induced metabolic dysfunction.
AbstractList Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation remain elusive. Here we show that obesity promotes mtDNA release into the cytosol, where it triggers inflammatory responses by activating the DNA-sensing cGAS-cGAMP-STING pathway. Fat-specific knockout of disulfide-bond A oxidoreductase-like protein (DsbA-L), a chaperone-like protein originally identified in the mitochondrial matrix, impaired mitochondrial function and promoted mtDNA release, leading to activation of the cGAS-cGAMP-STING pathway and inflammatory responses. Conversely, fat-specific overexpression of DsbA-L protected mice against high-fat diet-induced activation of the cGAS-cGAMP-STING pathway and inflammation. Taken together, we identify DsbA-L as a key molecule that maintains mitochondrial integrity. DsbA-L deficiency promotes inflammation and insulin resistance by activating the cGAS-cGAMP-STING pathway. Our study also reveals that, in addition to its well-characterized roles in innate immune surveillance, the cGAS-cGAMP-STING pathway plays an important role in mediating obesity-induced metabolic dysfunction.
Activation of the cGAMP-cGAS-STING pathway has recently been shown to mediate virus- or bacteria-induced activation of the innate immune response. Here we report that this pathway also plays an important role in obesity-induced inflammation and metabolic dysfunction, beyond its well-characterized roles in innate immune surveillance. We have also identified adipose disulfide-bond A oxidoreductase-like protein as a key regulator of mitochondrial integrity and function, which protects mice from obesity-induced inflammation and insulin resistance by suppressing mtDNA release-induced activation of the cGAS-cGAMP-STING pathway. Our study suggests that targeting the cGAS-cGAMP-STING pathway in adipose tissue may be an effective approach to ameliorating obesity-induced chronic inflammation and its associated metabolic diseases. Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation remain elusive. Here we show that obesity promotes mtDNA release into the cytosol, where it triggers inflammatory responses by activating the DNA-sensing cGAS-cGAMP-STING pathway. Fat-specific knockout of disulfide-bond A oxidoreductase-like protein (DsbA-L), a chaperone-like protein originally identified in the mitochondrial matrix, impaired mitochondrial function and promoted mtDNA release, leading to activation of the cGAS-cGAMP-STING pathway and inflammatory responses. Conversely, fat-specific overexpression of DsbA-L protected mice against high-fat diet-induced activation of the cGAS-cGAMP-STING pathway and inflammation. Taken together, we identify DsbA-L as a key molecule that maintains mitochondrial integrity. DsbA-L deficiency promotes inflammation and insulin resistance by activating the cGAS-cGAMP-STING pathway. Our study also reveals that, in addition to its well-characterized roles in innate immune surveillance, the cGAS-cGAMP-STING pathway plays an important role in mediating obesity-induced metabolic dysfunction.
Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation remain elusive. Here we show that obesity promotes mtDNA release into the cytosol, where it triggers inflammatory responses by activating the DNA-sensing cGAS-cGAMP-STING pathway. Fat-specific knockout of disulfide-bond A oxidoreductase-like protein (DsbA-L), a chaperone-like protein originally identified in the mitochondrial matrix, impaired mitochondrial function and promoted mtDNA release, leading to activation of the cGAS-cGAMP-STING pathway and inflammatory responses. Conversely, fat-specific overexpression of DsbA-L protected mice against high-fat diet-induced activation of the cGAS-cGAMP-STING pathway and inflammation. Taken together, we identify DsbA-L as a key molecule that maintains mitochondrial integrity. DsbA-L deficiency promotes inflammation and insulin resistance by activating the cGAS-cGAMP-STING pathway. Our study also reveals that, in addition to its well-characterized roles in innate immune surveillance, the cGAS-cGAMP-STING pathway plays an important role in mediating obesity-induced metabolic dysfunction.Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation remain elusive. Here we show that obesity promotes mtDNA release into the cytosol, where it triggers inflammatory responses by activating the DNA-sensing cGAS-cGAMP-STING pathway. Fat-specific knockout of disulfide-bond A oxidoreductase-like protein (DsbA-L), a chaperone-like protein originally identified in the mitochondrial matrix, impaired mitochondrial function and promoted mtDNA release, leading to activation of the cGAS-cGAMP-STING pathway and inflammatory responses. Conversely, fat-specific overexpression of DsbA-L protected mice against high-fat diet-induced activation of the cGAS-cGAMP-STING pathway and inflammation. Taken together, we identify DsbA-L as a key molecule that maintains mitochondrial integrity. DsbA-L deficiency promotes inflammation and insulin resistance by activating the cGAS-cGAMP-STING pathway. Our study also reveals that, in addition to its well-characterized roles in innate immune surveillance, the cGAS-cGAMP-STING pathway plays an important role in mediating obesity-induced metabolic dysfunction.
Author Zhou, Haiyan
Xu, Yong
Cervantes, Christopher
Liu, Juan
Dong, Lily Q.
Bai, Juli
Li, Zhi
Chen, Hongzhi
Wang, Fang
Gao, Xiaoli
O’Connor, Jason C.
Hu, Derong
Yin, Dongqing
Zhang, Bilin
Liu, Meilian
Liu, Feng
He, Sijia
Cai, Huan
Author_xml – sequence: 1
  givenname: Juli
  surname: Bai
  fullname: Bai, Juli
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 2
  givenname: Christopher
  surname: Cervantes
  fullname: Cervantes, Christopher
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 3
  givenname: Juan
  surname: Liu
  fullname: Liu, Juan
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 4
  givenname: Sijia
  surname: He
  fullname: He, Sijia
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 5
  givenname: Haiyan
  surname: Zhou
  fullname: Zhou, Haiyan
  organization: Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
– sequence: 6
  givenname: Bilin
  surname: Zhang
  fullname: Zhang, Bilin
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 7
  givenname: Huan
  surname: Cai
  fullname: Cai, Huan
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 8
  givenname: Dongqing
  surname: Yin
  fullname: Yin, Dongqing
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 9
  givenname: Derong
  surname: Hu
  fullname: Hu, Derong
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 10
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  surname: Li
  fullname: Li, Zhi
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 11
  givenname: Hongzhi
  surname: Chen
  fullname: Chen, Hongzhi
  organization: Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
– sequence: 12
  givenname: Xiaoli
  surname: Gao
  fullname: Gao, Xiaoli
  organization: Department of Biochemistry, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 13
  givenname: Fang
  surname: Wang
  fullname: Wang, Fang
  organization: Department of Endocrinology, Third Xiangya Hospital, Central South University, Changsha, Hunan, 410013, China
– sequence: 14
  givenname: Jason C.
  surname: O’Connor
  fullname: O’Connor, Jason C.
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 15
  givenname: Yong
  surname: Xu
  fullname: Xu, Yong
  organization: Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030
– sequence: 16
  givenname: Meilian
  surname: Liu
  fullname: Liu, Meilian
  organization: Department of Metabolism and Endocrinology, Metabolic Syndrome Research Center, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China
– sequence: 17
  givenname: Lily Q.
  surname: Dong
  fullname: Dong, Lily Q.
  organization: Department of Cell Systems & Anatomy, University of Texas Health at San Antonio, San Antonio, TX 78229
– sequence: 18
  givenname: Feng
  surname: Liu
  fullname: Liu, Feng
  organization: Department of Pharmacology, University of Texas Health at San Antonio, San Antonio, TX 78229
BackLink https://www.ncbi.nlm.nih.gov/pubmed/29087318$$D View this record in MEDLINE/PubMed
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Keywords cGAS
inflammation
insulin resistance
DsbA-L
obesity
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Author contributions: J.B. and F.L. designed research; J.B., C.C., J.L., S.H., H.Z., B.Z., H. Cai, D.Y., D.H., Z.L., H. Chen, X.G., F.W., J.C.O., Y.X., and M.L. performed research; J.B., C.C., J.L., H.Z., H. Cai, X.G., J.C.O., and F.L. analyzed data; and J.B., L.Q.D., and F.L. wrote the paper.
Edited by Alan Saltiel, University of California, San Diego, La Jolla, CA, and accepted by Editorial Board Member David J. Mangelsdorf October 4, 2017 (received for review May 26, 2017)
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Snippet Chronic inflammation in adipose tissue plays a key role in obesity-induced insulin resistance. However, the mechanisms underlying obesity-induced inflammation...
Activation of the cGAMP-cGAS-STING pathway has recently been shown to mediate virus- or bacteria-induced activation of the innate immune response. Here we...
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SubjectTerms Activation
Adipose tissue
Biological Sciences
Cytosol
Deoxyribonucleic acid
DNA
High fat diet
Immunosurveillance
Inflammation
Insulin
Insulin resistance
Mitochondria
Mitochondrial DNA
Obesity
Oxidoreductase
Proteins
Title DsbA-L prevents obesity-induced inflammation and insulin resistance by suppressing the mtDNA release-activated cGAS-cGAMP-STING pathway
URI https://www.jstor.org/stable/26486549
https://www.ncbi.nlm.nih.gov/pubmed/29087318
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