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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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.
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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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DOI: https://doi.org/10.1007/s10787-023-01278-x