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MyD88 gene knockout attenuates paraquat-induced acute lung injury
Haitao Shen1, Na Wu2, Yu Wang1
1Department of Emergency Medicine, Shengjing Hospital of China Medical University, Shenyang 110004, People's Republic of China.
Objective:
This study investigated the role of myeloid differentiation factor 88 (MyD88) in paraquat-induced acute lung injury (ALI).
Methods:
C57BL mice were divided into the control group, paraquat group, MyD88 knockout (KO) group, and MyD88 KO plus paraquat group. At 48h after paraquat poisoning, serum and lung tissues were collected. ELISA was employed to detect tumor necrosis factor-α (TNF-α) and interleukine-1β (IL-1β) contents in serum. Lung tissues were processed for hematoxylin-eosin staining, followed by histological scoring. PCR was performed to detect the mRNA expression of MyD88, TNF-α, and IL-1β in the lungs. Immunofluorescence staining was done to evaluate the expression and distribution of MyD88 and nuclear factor κB (NF-κB) in the lungs. Western blotting was conducted to detect the protein level of toll-like receptor (TLR) 4, TLR9, MyD88, and NF-κB in the lungs.
Results:
Paraquat poisoning significantly increased serum inflammatory cytokines, as well as MyD88, TLR4, TLR9, and NF-κB, and resulted in ALI. After MyD88 KO, the levels of inflammatory cytokines and NF-κB decreased markedly, and ALI was also attenuated although TLR4 and TLR9 expression continued at an elevated level.
Conclusion:
MyD88 mediates paraquat-induced ALI, and MyD88 gene knockout may attenuate paraquat-induced ALI and reduce the production of proinflammatory cytokines.
Insights
Myeloid differentiation factor 88 (MyD88) mediates paraquat-induced lung injury. MyD88 gene knockout attenuated acute lung injury and reduced inflammatory cytokine production in mice.
Area of Science:
- Immunology
- Toxicology
- Pulmonology
Background:
- Paraquat is a herbicide that can cause severe lung damage.
- Myeloid differentiation factor 88 (MyD88) is a key adaptor protein in inflammatory signaling pathways.
Purpose of the Study:
- To investigate the role of MyD88 in paraquat-induced acute lung injury (ALI).
Main Methods:
- Mice were exposed to paraquat, with or without MyD88 knockout (KO).
- Serum and lung tissues were analyzed for inflammatory cytokines (TNF-α, IL-1β), MyD88, TLRs, and NF-κB expression.
- Histological analysis assessed lung injury severity.
Main Results:
- Paraquat exposure increased inflammatory cytokines, MyD88, TLRs, and NF-κB, leading to ALI.
- MyD88 KO significantly reduced inflammatory cytokines and NF-κB, and attenuated ALI, despite sustained TLR4 and TLR9 elevation.
Conclusions:
- MyD88 plays a crucial role in mediating paraquat-induced ALI.
- MyD88 gene knockout offers a potential therapeutic strategy to mitigate paraquat toxicity and associated inflammation.
