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TLR5 silencing reduced hyperammonaemia-induced liver injury by inhibiting oxidative stress and inflammation responses via inactivating NF-κB and MAPK signals
- Source :
- Chemico-Biological Interactions. 299:102-110
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Background Liver injury is a serious threat for human health and life. Toll-like receptor 5 (TLR5) has reported to be a vital mediator in flagellin or tetrachloride (CCl4)-induced liver injury. However, the roles and etiology of TLR5 in hyperammonaemia (HA)-induced liver injury are poor defined. Methods HA rats were generated by intragastric administration using ammonium chloride solution. Liver status was assessed by haematoxylin and eosin (H&E) staining and measuring serum levels of liver injury markers. Immunohistochemistry (IHC) assay was used to visualize protein expression in tissues. Apoptotic index in tissues was determined by TUNEL assay. RT-qPCR assay was employed to test mRNA expression. Oxidative stress responses was assessed by detecting levels of reactive oxygen species (ROS) and related indicators. NF-κB activity was examined by TransAM NF-κB colorimetric kit. Results TLR5 was highly expressed in liver tissues of HA rats. TLR5 knockdown ameliorated HA-induced liver injury by inhibiting liver cell apoptosis. TLR5 depletion inhibited HA-induced pro-inflammatory cytokine expression in liver tissues, but had no effect on the infiltration of T and macrophage cells into liver tissues. TLR5 silencing impaired HA-induced oxidative stress responses in hepatocytes, but not in hepatic stellate cells (HSCs). TLR5 downregulation inhibited HA-induced activation on TLR5/NF-κB and TLR5/MAPK signaling pathways. Conclusion TLR5 silencing reduced HA-induced liver injury by inhibiting hepatocyte apoptosis, oxidative stress and inflammation responses via inactivating NF-κB and MAPK signals, deepening our understanding on the molecular mechanism of HA-induced liver injury and providing a potential therapeutic target for alleviating liver injury.
- Subjects :
- Male
0301 basic medicine
MAPK/ERK pathway
Apoptosis
Inflammation
Toxicology
medicine.disease_cause
Ammonium Chloride
Rats, Sprague-Dawley
03 medical and health sciences
0302 clinical medicine
Hepatic Stellate Cells
medicine
Animals
Hyperammonemia
Aspartate Aminotransferases
chemistry.chemical_classification
Liver injury
Reactive oxygen species
TUNEL assay
Liver Diseases
Macrophages
Liver cell
NF-kappa B
Alanine Transaminase
General Medicine
medicine.disease
Rats
Oxidative Stress
Toll-Like Receptor 5
030104 developmental biology
Liver
chemistry
030220 oncology & carcinogenesis
Hepatic stellate cell
Cancer research
Cytokines
Mitogen-Activated Protein Kinases
medicine.symptom
Reactive Oxygen Species
Oxidative stress
Signal Transduction
Subjects
Details
- ISSN :
- 00092797
- Volume :
- 299
- Database :
- OpenAIRE
- Journal :
- Chemico-Biological Interactions
- Accession number :
- edsair.doi.dedup.....d51eb3d8da77c9e4b6b7c3dd751acd04