TITLE

The significance of Toll-like receptor 4 (TLR4) expression in patients with chronic hepatitis B

AUTHOR(S)
Xiu-Qing Wei; Yun-Wei Guo; Jia-Jun Liu; Zhuo-Fu Wen; Shao-Ji Yang; Ji-Lu Yao
PUB. DATE
June 2008
SOURCE
Clinical & Investigative Medicine;Jun2008, Vol. 31 Issue 3, pE123
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Purpose: To investigate the importance of Toll-like receptor 4 (TLR4) expression on hepatocytes obtained from Chronic Hepatitis B patients as well as on hepatocellular carcinoma HepG2 and HepG2.2.15 cell lines. Methods: Expression of TLR4 in liver tissues was determined by immunohistochemistry in 75 patients with CHB and in10 healthy controls. The protein and mRNA levels of TLR4 in hepatocellular carcinoma HepG2 and HepG2.2.15 cells were measured by flow cytometry (FCM) and real-time quantitative PCR (RQ-PCR), and endotoxin triggered TNF-α secretion in HepG2 and HepG2.2.15 cells was evaluated by ELISA. Results: TLR4 expressed mainly in the cytoplasm and some on cell membrane in hepatocytes. The staining scores of TLR4 expression in the liver tissues of patients with CHB were significantly higher than that of healthy controls. The liver tissues from patients with severe CHB expressed higher level of TLR4 than those from patients with mild CHB. Furthermore, the staining scores of TLR4 expression in the liver tissues of patients with CHB were positively correlated with the grading scores. Our results also showed that the mean fluorescence intensity and TNF-α secretion induced by endotoxin as well as the protein and mRNA levels of TLR4 in HepG2.2.15 cells were all significantly higher than those in HepG2 cells. Conclusion: TLR4 was up-regulated in the hepatocytes in patients with CHB. This indicates a potentially important interaction between TLR4 expression and the pathogenesis of CHB.
ACCESSION #
33058992

 

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