z-logo
Premium
Endotoxin accumulation prevents carcinogen‐induced apoptosis and promotes liver tumorigenesis in rodents
Author(s) -
Yu LeXing,
Yan HeXin,
Liu Qiong,
Yang Wen,
Wu HongPing,
Dong Wei,
Tang Liang,
Lin Yan,
He YaQin,
Zou ShanShan,
Wang Chao,
Zhang HuiLu,
Cao GuangWen,
Wu MengChao,
Wang HongYang
Publication year - 2010
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.23845
Subject(s) - tlr4 , inflammation , cancer research , tumor promotion , carcinogenesis , carcinogen , cytokine , biology , cirrhosis , immunology , medicine , cancer , genetics
Increasing evidence suggests that the presence of endotoxemia is of substantial clinical relevance to patients with cirrhosis, but it is unclear whether and how gut‐derived LPS amplifies the tumorigenic response of the liver. We found that the circulating levels of LPS were elevated in animal models of carcinogen‐induced hepatocarcinogenesis. Reduction of LPS using antibiotics regimen in rats or genetic ablation of its receptor Toll‐like receptor 4 (TLR4) in mice prevented excessive tumor growth and multiplicity. Additional investigation revealed that TLR4 ablation sensitizes the liver to carcinogen‐induced toxicity via blocking NF‐κB activation and sensitizing the liver to reactive oxygen species (ROS)‐induced toxicity, but lessens inflammation‐mediated compensatory proliferation. Reconstitution of TLR4 ‐expressing myeloid cells in TLR4 ‐deficient mice restored diethylnitrosamine (DEN)‐induced hepatic inflammation and proliferation, indicating a paracrine mechanism of LPS in tumor promotion. Meanwhile, deletion of gut‐derived endotoxin suppressed DEN‐induced cytokine production and compensatory proliferation, whereas in vivo LPS pre‐challenge promotes hepatocyte proliferation. Conclusion: Our data indicate that sustained LPS accumulation represents a pathological mediator of inflammation‐associated hepatocellular carcinoma (HCC) and manipulation of the gut flora to prevent pathogenic bacterial translocation and endotoxin absorption may favorably influence liver function in patients with cirrhosis who are at risk of developing HCC. (H epatology 2010.)

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here