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Itaconate links inhibition of succinate dehydrogenase with macrophage metabolic remodeling and regulation of inflammation

ABSTRACT: Remodeling of the tricarboxylic acid (TCA) cycle is a metabolic adaptation mechanism accompanying inflammatory macrophage activation. During this process, endogenous metabolites can adopt regulatory roles that govern specific aspects of inflammatory response, as recently shown for succinate, which regulates the downstream pro-inflammatory IL-1β-HIF1a axis. Itaconate is one of the most highly induced metabolites in activated macrophages, yet its functional significance remains unknown. Here, we show that itaconate modulates macrophage metabolism and effector functions via its effect on succinate dehydrogenase, by inhibiting conversion of succinate to fumarate. Through this action, itaconate exerts anti-inflammatory effects when administered in vitro and in vivo during macrophage activation and ischemia-reperfusion injury. Using newly generated Irg1-/- mice, which lack the ability to produce itaconate, we show that endogenous itaconate regulates succinate levels and function, changes in mitochondrial respiration, and inflammatory cytokine production during macrophage activation. These studies highlight itaconate as a major physiological regulator of the global metabolic rewiring and effector functions of inflammatory macrophages.

ORGANISM(S): Mus musculus

PROVIDER: GSE82043 | GEO | 2016/07/01

SECONDARY ACCESSION(S): PRJNA323739

REPOSITORIES: GEO

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Itaconate links inhibition of succinate dehydrogenase with macrophage metabolic remodeling and regulation of inflammation

Project description:Remodeling of the tricarboxylic acid (TCA) cycle is a metabolic adaptation mechanism accompanying inflammatory macrophage activation. During this process, endogenous metabolites can adopt regulatory roles that govern specific aspects of inflammatory response, as recently shown for succinate, which regulates the downstream pro-inflammatory IL-1Î²-HIF1a axis. Itaconate is one of the most highly induced metabolites in activated macrophages, yet its functional significance remains unknown. Here, we show that itaconate modulates macrophage metabolism and effector functions via its effect on succinate dehydrogenase, by inhibiting conversion of succinate to fumarate. Through this action, itaconate exerts anti-inflammatory effects when administered in vitro and in vivo during macrophage activation and ischemia-reperfusion injury. Using newly generated Irg1-/- mice, which lack the ability to produce itaconate, we show that endogenous itaconate regulates succinate levels and function, changes in mitochondrial respiration, and inflammatory cytokine production during macrophage activation. These studies highlight itaconate as a major physiological regulator of the global metabolic rewiring and effector functions of inflammatory macrophages. Experiment 1: mature WT BMDM were treated for 12h with 0.25 mM dimethyl itaconate (DI) or vehicle (Unst) and then stimulated with LPS (E. coli 0111:B4; 100 ng/ml, 4h) (DI+LPS; LPS); Experiment 2: mature Irg1-/- BMDM were stimulated with LPS (E. coli 0111:B4; 100 ng/ml) and murine recombinant IFNg (50 ng/ml) for 24h.

2016-07-01 | E-GEOD-82043 | biostudies-arrayexpress

4-Octyl itaconate as a metabolite derivative inhibits inflammation via alkylation of STING

Project description:<p>The Krebs cycle-derived metabolite itaconate, whose production is catalyzed by immune response gene 1 (IRG1), has excellent potential to link immunity and metabolism in activated macrophages through alkylation or competitive inhibition of target proteins. In support of this, our previous study demonstrated that the stimulator of interferon genes (STING) signaling platform functions as a hub in macrophage immunity and has a profound impact on the prognosis of sepsis. Interestingly, we found that itaconate, an endogenous immunomodulator, can significantly inhibit the activation of STING signaling. Moreover, 4-octyl itaconate (4-OI), which is a permeable itaconate derivative, could alkylate cysteine sites 65, 71, 88, and 147 of STING, thereby inhibiting its phosphorylation and downregulating the production of related inflammatory factors. Furthermore, itaconate and 4-OI inhibited the production of inflammatory factors in sepsis models. Our results have broadened the role of the IRG1-Itaconate axis in immunomodulation and highlighted itaconate and its derivatives as potential therapeutic agents in sepsis.</p>

2023-01-15 | MTBLS5877 | MetaboLights

Immune-Responsive Gene 1 expression in myeloid cells prevents neutrophil mediated immunopathology during Mycobacterium tuberculosis infection, in vivo neutrophil data

Project description:Immune-Responsive Gene 1 (Irg1) is a mitochondrial enzyme that produces itaconate under inflammatory conditions principally in cells of myeloid lineage. Cell culture studies suggest that itaconate regulates inflammation through inhibitory effects on cytokine and reactive oxygen species production. To evaluate the functions of Irg1 in vivo, we challenged wild-type (WT) and Irg1 KO mice with Mycobacterium tuberculosis (Mtb) and monitored disease progression. Irg1 KO but not WT mice succumbed rapidly to Mtb, and mortality was associated with increased infection, inflammation, and pathology. Infection of LysM-Cre Irg1 flox, MPR8-Cre Irg1 flox, and CD11c-Cre Irg1 flox conditional knockout mice along with neutrophil depletion experiments revealed a role for Irg1 in alveolar macrophages and LysM+ myeloid cells in preventing neutrophil-mediated immunopathology and disease. RNA-seq analyses suggest that Irg1 and its production of itaconate temper Mtb-induced inflammatory responses in myeloid cells at the transcriptional level. Thus, Irg1 modulates inflammation to curtail Mtb-induced lung disease.

2017-08-30 | GSE98457 | GEO

Immune-Responsive Gene 1 expression in myeloid cells prevents neutrophil mediated immunopathology during Mycobacterium tuberculosis infection, in vitro neutrophils data

2017-08-30 | GSE98456 | GEO

Immune-Responsive Gene 1 expression in myeloid cells prevents neutrophil mediated immunopathology during Mycobacterium tuberculosis infection [macrophage]

Project description:Immune-Responsive Gene 1 (Irg1) is a mitochondrial enzyme that produces itaconate under inflammatory conditions principally in cells of myeloid lineage. Cell culture studies suggest that itaconate regulates inflammation through inhibitory effects on cytokine and reactive oxygen species production. To evaluate the functions of Irg1 in vivo, we challenged wild-type (WT) and Irg1-/- mice with Mycobacterium tuberculosis (Mtb) and monitored disease progression. Irg1-/- but not WT mice succumbed rapidly to Mtb, and mortality was associated with increased infection, inflammation, and pathology. Infection of LysM-Cre Irg1fl/fl, MPR8-Cre Irg1fl/fl, and CD11c-Cre Irg1fl/fl conditional knockout mice along with neutrophil depletion experiments revealed a role for Irg1 in alveolar macrophages and LysM+ myeloid cells in preventing neutrophil-mediated immunopathology and disease. RNA-seq analyses suggest that Irg1 and its production of itaconate temper Mtb-induced inflammatory responses in myeloid cells at the transcriptional level. Thus, Irg1 modulates inflammation to curtail Mtb-induced lung disease.

2018-02-15 | GSE108188 | GEO

Nitric oxide modulates metabolic remodelling and immunometabolism in inflammatory murine macrophages

Project description:Classical stimulation of macrophages (MLPS/IFNγ) elicits the expression of inducible nitric oxide synthase (iNOS), generating large amounts of nitric oxide (NO) and inhibiting respiration. Consequent upregulation of glycolysis and a disrupted tricarboxylic acid (TCA) cycle underpin this switch to a pro-inflammatory phenotype. Here we show that the NOS cofactor tetrahydrobiopterin (BH4) modulates key aspects of metabolic remodelling in activated bone-marrow-derived macrophages (BMDMs) via NO production. Using two complementary mouse models that each lack the capacity for inducible NO generation, through different mechanisms, we reveal that NO regulates macrophage respiratory function via changes in the abundance of critical N-module subunits in Complex I, by HIF1α-mediated glycolytic remodelling, and by modulating levels of the critical TCA cycle metabolites, and inflammatory mediators, citrate, succinate, and itaconate. Taken together, our findings reveal new critical roles for iNOS-derived NO that are required for metabolic remodelling and cytokine production in macrophage inflammatory responses.

2019-05-31 | PXD010628 | Pride

Host metabolic reprogramming during immune activation promotes intracellular bacterial survival (glycerol or succinate)

Project description:Intracellular pathogens, such as Salmonella enterica serovar Typhimurium (S.Tm), are able to sense and respond to a changing host cell environment. Macrophages exposed to microbial products undergo metabolic changes that are increasingly understood to drive a productive inflammatory response. However, the role of macrophage metabolic reprogramming in bacterial adaptation to the intracellular environment has not been explored. Here we show that changes in host metabolic state serve as a signal detected byS.Tm. Using metabolic profiling and dual RNA-seq, we show that succinate accumulates in infected macrophages and is sensed by intracellular S.Tm to promote induction of virulence genes. Succinate uptake by the bacterium drives induction of pmrAB-dependent genes and SPI-2 virulence-associated regulon. S.Tm lacking the DcuB transporter for succinate uptake display impaired intracellular survival. Our work demonstrates that accumulation of metabolic intermediates, necessary for macrophage activation, promote intracellular survival of pathogens, opening a new realm of metabolic host-pathogen crosstalk.

2022-10-19 | GSE139207 | GEO

Staphylococcus aureus stimulates neutrophil itaconate production that suppresses the oxidative burst

Project description:Neutrophils are critical in the host defense against Staphylococcus aureus, a major human pathogen. However, even in the setting of a robust neutrophil response, S. aureus can cause persistent infection. Here we demonstrate that S. aureus impairs neutrophil function by triggering the production of the anti-inflammatory metabolite, itaconate. The enzyme that synthesizes itaconate, Irg1, is selectively expressed in neutrophils during S. aureus pneumonia. Itaconate inhibits neutrophil glycolysis and oxidative burst, which impairs survival and bacterial killing. In a murine pneumonia model, neutrophil Irg1 expression protects critical lung cell populations from oxidative stress but compromises bacterial clearance. S. aureus is thus able to evade innate immune clearance by targeting neutrophil metabolism and inducing the production of the antiinflammatory metabolite itaconate.

2023-01-01 | GSE215195 | GEO

Itaconate stabilizes CPT1a to enhance lipid utilization during inflammation

Project description:One primary metabolic manifestation of inflammation is the diversion of cis-aconitate within the tricarboxylic acid (TCA) cycle to synthesize the immunometabolite itaconate. Itaconate is well established to possess immunomodulatory and metabolic effects within myeloid cells and lymphocytes, however, its effects in other organ systems during sepsis remain less clear. Utilizing Irg1 knockout mice that are deficient in synthesizing itaconate, we aimed at understanding the metabolic role of itaconate in the liver and systemically during sepsis. We find itaconate aids in lipid metabolism during sepsis. Specifically, Irg1 KO mice develop a heightened level of hepatic steatosis when induced with polymicrobial sepsis. Proteomics analysis reveal enhanced expression of enzymes involved in fatty acid oxidation in following 4-ocytl itaconate (4-OI) treatment in vitro. Downstream analysis reveals itaconate stabilizes the expression of the mitochondrial fatty acid uptake enzyme CPT1a, mediated by its hypoubiquitination. Chemoproteomic analysis revealed itaconate interacts with proteins involved in protein ubiquitination as a potential mechanism underlying its stabilizing effect on CPT1a. From a systemic perspective, we find itaconate deficiency triggers a hypothermic response following endotoxin stimulation, potentially mediated by brown adipose tissue (BAT) dysfunction. Finally, by use of metabolic cage studies, we demonstrate Irg1 KO mice rely more heavily on carbohydrates versus fatty acid sources for systemic fuel utilization in response to endotoxin treatment. Our data reveal a novel metabolic role of itaconate in modulating fatty acid oxidation during polymicrobial sepsis.

2024-01-29 | PXD047706 | Pride

Effect of depletion of succinate receptor 1 (SUCNR1) on the gene expression of mouse adipose tissue

Project description:The concept of “signaling metabolites” in the control of metabolic homeostasis is gaining traction. The Krebs cycle substrate succinate, a pleiotropic metabolite that acts akin to hormones and cytokines through succinate receptor 1 (SUCNR1, also known as GPR91), is one example of this new class of metabolites. SUCNR1 has a broad expression and is highly abundant in white adipose tissue. It was a general assumption that SUCNR1 is functionally inactive in healthy tissues, and for many years, SUCNR1 was explored from an immune perspective, mainly in inflammatory-related conditions, particularly those associated with chronic hypersuccinemia. Recent studies, however, indicate that extracellular levels of succinate transiently increase in response to physiological changes such as exercise, cold exposure, or food ingestion. Succinate thus emerges as a reporter of both tissue stress and metabolism, raising the possibility of its involvement in additional metabolic functions as a hormone-like metabolite. Indeed, it is conceivable that "succinate sensing" by SUCNR1 may be part of the metabolite-sensing machinery that governs energy homeostasis. To better understand the effect of the adipocyte Sucnr1 deletion on adipose tissue, we selectively inactivated Sucnr1 in murine adipocytes and profiled the transcription state of epididymal white adipose tissue from adipocyte cell-specific Sucnr1 knockout mice (Ad-Sucnr1 KO) and control Sucnr1fl/fl mice.

2023-03-27 | GSE200749 | GEO

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