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The roles of Toll-like receptor 4 in the pathogenesis of pathogen-associated biliary fibrosis caused by Clonorchis sinensis.

ABSTRACT: Pathogen-associated biliary fibrosis (PABF) is a type of liver fibrosis characterized by injuries of cholangiocytes and extra cellular matrix (ECM) deposition around bile ducts caused by various bacteria, fungi, virus and parasites. Recent studies show that TLR4 plays an important role in several other types of liver fibrosis, but the mechanism of TLR4 in PABF is yet really unclear. In the present study, a PABF mouse model was established by a trematode infection-Clonorchis sinensis which dwells in the bile ducts and causes severe biliary fibrosis of mice. The results showed that the levels of collagen depositions, ?-SMA and hydroxyproline (Hyp) contents in TLR4 mut mice infected by C. sinensis were significantly lower than in those of TLR4 wild ones. Furthermore, we found that the activation of TGF-? signaling was impaired in the TLR4 mut mice, compared with wild mice when they were challenged to the same dose of C. sinensis metacercariae. Moreover, the mice with TLR4 mutation showed a decreased activation of hepatic stellate cells indicated by the expression of ?-SMA, when compared with TLR4 wild mice. These data demonstrate that TLR4 contributes to PABF caused by C. sinensis and TLR4 signaling may be a potential medical target for treatment of PABF.

SUBMITTER: Yan C

PROVIDER: S-EPMC5478609 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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The roles of Toll-like receptor 4 in the pathogenesis of pathogen-associated biliary fibrosis caused by Clonorchis sinensis.

Yan Chao C Li Bo B Fan Fang F Du Ying Y Ma Rui R Cheng Xiao-Dan XD Li Xiang-Yang XY Zhang Bo B Yu Qian Q Wang Yu-Gang YG Tang Ren-Xian RX Zheng Kui-Yang KY

Scientific reports 20170620 1

Pathogen-associated biliary fibrosis (PABF) is a type of liver fibrosis characterized by injuries of cholangiocytes and extra cellular matrix (ECM) deposition around bile ducts caused by various bacteria, fungi, virus and parasites. Recent studies show that TLR4 plays an important role in several other types of liver fibrosis, but the mechanism of TLR4 in PABF is yet really unclear. In the present study, a PABF mouse model was established by a trematode infection-Clonorchis sinensis which dwells ...[more]

PMID: 28634394

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Project description:Liver fibrosis is a hallmark of clonorchiasis suffered by millions people in Eastern Asian countries. Recent studies showed that the activation of TGF-?/Smad signaling pathway can potently regulate the hepatic fibrogenesis including Schistosoma spp. and Echinococcus multilocularis-caused liver fibrosis. However, little is known to date about the expression of transforming growth factor-? (TGF-?) and other molecules in TGF-?/Smad signaling pathway which may play an important role in hepatic fibrosis caused by C. sinensis.A total of 24 mice were individually infected orally with 45 metacercariae, both experimental mice and mocked-infected control mice were anesthetized at 4 week post-infection (wk p.i.), 8 wk p.i. and 16 wk p.i., respectively. For each time-point, the liver and serum from each animal were collected to analyze histological findings and various fibrotic parameters including TGF-??, TGF-? receptors and down-stream Smads activation, as well as fibrosis markers expression.The results showed that collagen deposition indicated by hydroxyproline content and Masson's trichrome staining was increased gradually with the development of infection. The expression of collagen type ?1 (Col1a) mRNA transcripts was steadily increased during the whole infection. The mRNA levels of Smad2, Smad3 as well as the protein of Smad3 in the liver of C. sinensis-infected mice were increased after 4 wk p.i. (P?<?0.05, compared with normal control) whereas the TGF-??, TGF-? type I receptor (TGF?RI) and TGF-? type II receptor (TGF?RII) mRNA expression in C. sinensis-infected mice were higher than those of normal control mice after 8 wk p.i. (P?<?0.05). However, the gene expression of Smad4 and Smad7 were peaked at 4 wk p.i. (P?<?0.05), and thereafter dropped to the basal level at 8 wk p.i., and 16 wk p.i., respectively. The concentrations of TGF-?? in serum in the C. sinensis-infected mice at 8 wk p.i. and 16 wk p.i (P?<?0.05) were significantly higher than those in the control mice.The results of the present study indicated for the first time that the activation of TGF-?/Smad signaling pathway might contribute to the synthesis of collagen type I which leads to liver fibrosis caused by C. sinensis.

Dataset Information

The roles of Toll-like receptor 4 in the pathogenesis of pathogen-associated biliary fibrosis caused by Clonorchis sinensis.

Publications

The roles of Toll-like receptor 4 in the pathogenesis of pathogen-associated biliary fibrosis caused by Clonorchis sinensis.

Similar Datasets

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