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05:52
Lipopolysaccharide Infusion as a Porcine Endotoxemic Shock Model
Published on: December 8, 2023
TXNIP deficiency exacerbates endotoxic shock via the induction of excessive nitric oxide synthesis
Young-Jun Park1, Sung-Jin Yoon, Hyun-Woo Suh
1Immunotherapy Research Center, Korea Research Institute of Bioscience and Biotechnology, Yuseong-gu, Daejeon, Republic of Korea ; Department of Functional Genomics, University of Science and Technology, Yuseong-gu, Daejeon, Republic of Korea.
Plos Pathogens
|October 8, 2013
Summary
Thioredoxin-interacting protein (TXNIP) deficiency increases susceptibility to endotoxic shock by elevating nitric oxide (NO) production. TXNIP links NO synthesis and NLRP3 inflammasome activation in this inflammatory response.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Thioredoxin-interacting protein (TXNIP) has known roles in tumor suppression, cell proliferation, and apoptosis.
- The specific function of TXNIP in inflammatory processes is not well understood.
Purpose of the Study:
- To investigate the role of TXNIP in lipopolysaccharide (LPS)-induced endotoxic shock.
- To elucidate the mechanisms underlying TXNIP's involvement in inflammatory responses.
Main Methods:
- Utilized Txnip knockout (Txnip⁻/⁻) mice and wild-type controls.
- Administered lipopolysaccharide (LPS) to induce endotoxic shock.
- Measured nitric oxide (NO) and inducible nitric oxide synthase (iNOS) levels in macrophages.
- Assessed the effect of an iNOS inhibitor on survival.
- Analyzed NLRP3 inflammasome activation and IL-1β secretion.
Main Results:
- Txnip⁻/⁻ mice exhibited significantly increased susceptibility to LPS-induced endotoxic shock.
- Txnip⁻/⁻ macrophages produced higher levels of NO and iNOS in response to LPS.
- Inhibition of iNOS rescued Txnip⁻/⁻ mice from endotoxic shock mortality.
- Reduced IL-1β secretion was observed in Txnip⁻/⁻ mice due to increased S-nitrosylation of NLRP3.
Conclusions:
- TXNIP plays a critical role in regulating inflammatory responses during endotoxic shock.
- Elevated NO production is a key mediator of TXNIP-dependent susceptibility to endotoxic shock.
- TXNIP acts as a novel molecular link between NO synthesis and NLRP3 inflammasome activation in endotoxic shock.
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