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Published on: July 6, 2019
Toll-like receptor 4 implicated in acute lung injury induced by paraquat poisoning in mice
Wei Liu1, Li-Ping Shan2, Xue-Song Dong1
1Department of Emergency, First Affiliated Hospital of China Medical University Shenyang, China.
Objective:
To investigate the possible relationship and mechanism of Toll-like receptor 4 (TLR4) and acute lung injury induced by paraquat (PQ) poisoning.
Methods:
Male wild type mice and male TLR4-knockout mice were used in this study. After paraquat treatment for 24 hours, mice were euthanized and pathology, TLR4 expression and pro-inflammatory cytokines were evaluated.
Results:
Wild type mice showed deteriorated lung injury, pathological damages and increased TLR4 expression and pulmonary TNF-α, IL-1β and NF-κB p65 levels after PQ treatment. TLR4-deficient mice were significantly resistant to paraquat-induced lung injury.
Conclusion:
TLR4 may be required as a mediator and may play an important role in acute lung injury induced by paraquat.
Insights
Toll-like receptor 4 (TLR4) plays a key role in paraquat-induced acute lung injury. Blocking TLR4 in mice significantly reduced lung damage and inflammation, highlighting its potential as a therapeutic target.
Area of Science:
- Toxicology
- Immunology
- Pulmonary Medicine
Background:
- Paraquat (PQ) poisoning is a significant cause of acute lung injury (ALI).
- The precise mechanisms underlying PQ-induced ALI are not fully understood.
- Toll-like receptor 4 (TLR4) is implicated in inflammatory responses.
Purpose of the Study:
- To investigate the role of Toll-like receptor 4 (TLR4) in paraquat-induced acute lung injury.
- To elucidate the potential mechanism involving TLR4 in paraquat poisoning.
Main Methods:
- Comparison of wild type and TLR4-knockout mice following paraquat administration.
- Assessment of lung pathology, TLR4 expression, and pro-inflammatory cytokine levels (TNF-α, IL-1β, NF-κB p65).
Main Results:
- Wild type mice exhibited severe lung injury, increased TLR4 expression, and elevated pro-inflammatory cytokines after paraquat exposure.
- TLR4-deficient mice demonstrated significant resistance to paraquat-induced lung injury.
- Paraquat treatment upregulated pulmonary TNF-α, IL-1β, and NF-κB p65 in wild type mice.
Conclusions:
- Toll-like receptor 4 (TLR4) is a critical mediator in paraquat-induced acute lung injury.
- TLR4 signaling appears to be essential for the development of lung damage in paraquat poisoning.
- Targeting TLR4 may offer a therapeutic strategy for paraquat poisoning.
