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Immune Response Gene-1 [IRG1]/itaconate protect against multi-organ injury via inhibiting gasdermin D-mediated pyroptosis and inflammatory response

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Abstract

Sepsis is a multiple organ dysfunction syndrome due to a dysregulated response to infection with unacceptably high mortality. Currently, no effective treatment exists for sepsis. IRG1/itaconate has been considered to play a protective role for various inflammatory diseases. In the present study, we explored the protective role and mechanisms of IRG1/itaconate on lipopolysaccharide (LPS)-induced multi-organ injury. The LPS-induced sepsis model was used. IRG1−/− and wild type mice were used to explore the protective role of IRG1/itaconate on multi-organ injury. GSDMD−/− mice were used to explore the effect of GSDMD-mediated pyroptosis on LPS-induced model. RAW264.7 cells and bone-marrow-derived macrophages (BMDMs) were used for in vitro studies. In vivo experiments, we found IRG1 deficiency aggravated LPS-induced multi-organ injury especially lung injury. 4-Octyl itaconate (4-OI), a derivative of itaconate, significantly ameliorated LPS-induced acute lung, liver, and kidney injury. Furthermore, IRG1/4-OI decreased serum interleukin-1β (IL-1β), IL-6, tumor necrosis factor-α (TNF-α) level, macrophage infiltration, and TUNEL-positive cells in lung and liver tissue. Western blot showed IRG1/itaconate decreased the expressions of p-ERK, p-P38, p-JNK, and p-P65 and increased the expression of Nrf2/HO-1 in lung tissue. Meanwhile, 4-OI inhibited the expression of GSDMD-N. In vitro experiments, 4-OI inhibited ROS production and promoted apoptosis under LPS stimulation in RAW264.7 cells. Furthermore, 4-OI inhibited nuclear factor-kappaB/mitogen-activated protein kinase pathways and GSDMD-medicated pyroptosis in BMDMs. Finally, we used GSDMD−/− mice to explore the effect of pyroptosis on LPS-induced multi-organ injury. The results showed that GSDMD deficiency significantly ameliorated lung injury. In conclusion, our data demonstrated that IRG1/itaconate protect against multi-organ injury via inhibiting inflammation response and GSDMD-indicated pyroptosis, which may be a promising agent for protecting against sepsis.

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Data availability

The data used to support the findings of this study are available from the corresponding authors upon request.

Abbreviations

BMDMs:

Bone-marrow-derived macrophages

GSDMD-N:

N-terminal domain of GSDMD

LPS:

Lipopolysaccharide

IL-1β:

Interleukin-1β

IRG1:

Immune responsive gene 1

MAPK:

Mitogen-activated protein kinase

NF-κb:

Nuclear factor kappaB

NLRP3:

NOD-like receptor protein 3

Nrf2:

Nuclear factor erythroid 2-related factor 2

ROS:

Reactive oxygen species

TLR4:

Toll-like receptor 4

TNF-α:

Tumor necrosis factor-α

4-OI:

4-Octyl itaconate

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Funding

This study was supported by the National Natural Science Foundation of China (No. 81701883, 82072736, and 82172171) and Science Foundation of Union Hospital (2022xhyn051).

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Contributions

All authors helped to perform the research; WY: conceptualization, data curation, investigation, software, roles/writing—original draft. YW: methodology, validation, funding acquisition. YH: formal analysis. TW: validation. CL: formal analysis. PZ: methodology, validation. WL: methodology, resources, supervision. YY: methodology, validation, supervision. RL: funding acquisition, project administration, resources, supervision, visualization, writing—review and editing. KT: funding acquisition, project administration, resources, supervision, visualization, writing—review and editing. All authors approved the final version for publication.

Corresponding authors

Correspondence to Ruidong Li or Kaixiong Tao.

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The authors declare that they have no competing interests.

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This study was approved by the Institutional Animal Use and Care Committee of Huazhong University of Science and Technology.

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Yang, W., Wang, Y., Huang, Y. et al. Immune Response Gene-1 [IRG1]/itaconate protect against multi-organ injury via inhibiting gasdermin D-mediated pyroptosis and inflammatory response. Inflammopharmacol 32, 419–432 (2024). https://doi.org/10.1007/s10787-023-01278-x

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