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A Role of Cell Apoptosis in Lipopolysaccharide (LPS)-induced Nonlethal Liver Injury in d-galactosamine (d-GalN)-sensitized Rats

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Abstract

Lipopolysaccharide (LPS) is implicated in the pathology of acute liver injury and can induce lethal liver failure when simultaneously administered with d-galactosamine (d-GalN). At the present time, nonlethal liver failure, the liver injury of clinical implication, is incompletely understood following challenge by low-dose LPS/d-GalN. We report here our investigation of the effects of liver injury following a nonlethal dose LPS/d-GalN and the role of apoptosis in this disorder. Blood biochemistry indexes, including those of alanine aminotransferase (ALT), aspartate aminotransferase (AST) and total bilirubin (TBIL), had risen by 6 h post-LPS/d-GalN injection, reached a peak at 24 h and sustained high levels at 48 h. An abnormal liver appearance was found at 24 and 48 h post-injection. Histopathological changes of hepatic injuries accompanied by hepatocellular death, inflammatory infiltration and hemorrhage began to appear at 6 h and were markedly aggravated at 24 and 48 h. Cell apoptosis was significantly induced by the nonlethal dose LPS/d-GalN challenge, and the apoptotic indexes (AIs) in 24 h- and 48 h-treated rats were approximately 70%, as estimated by the terminal transferase dUTP nick end labeling (TUNEL) assay. The mRNA levels of the inflammatory cytokine IL-1β rose markedly at 6 h and maintained high levels at 24 and 48 h; however, TNF-α levels were normal in the liver tissues of 6-, 24- and 48-h-treated rats. mRNA expression of the damage gene nitric oxide synthase (NOS) was also induced early by the LPS/d-GalN challenge, reaching a peak at 6 h, then gradually decreasing in a stepwise manner; conversely, high expression levels of the apoptosis-inducing gene p53 mRNA were not found in the early post-injection period (6 h) but emerged in the crest-time of liver apoptosis (24 h) and were maintained at this level until the late stage (48 h). We also observed that in 24 h-treated rats, caspase-3, -8, -9 and -12 were markedly activated by LPS/d-GalN challenge. These results suggest that a challenge with low-dose LPS in conjunction with d-GalN can induce nonlethal but marked liver failure, the main morphological feature of which is hepatic apoptosis, which may be associated with a high expression of inducible (i)NOS (early post-injection period) and p53 genes (in the mid and late stages) and at least three apoptosis pathways participate in the pathogenesis.

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Acknowledgements

We thank Jiang-jin Xu, Yu-chen Dai, Xiao-hua Qu, Jian-hong Jiang and Yai-qing Zou for valuable technical support. This study was supported by National Natural Scientific Grant of China (No.30660066, No.30360037)

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Authors and Affiliations

  1. Department of Gastroenterology, Second Affiliated Hospital, Nanchang University, Nanchang, Jiangxi Province, 330006, China

    Liang-Ming Liu, Ji-Xiang Zhang, Jie Luo, Hong-Xing Guo, Huan Deng, Jian-Yong Chen & Sui-Lin Sun

  2. Jiangxi Province Key Laboratory of Molecular Medicine, Nanchang, Jiangxi Province, 330006, China

    Liang-Ming Liu, Ji-Xiang Zhang, Jie Luo, Hong-Xing Guo, Huan Deng, Jian-Yong Chen & Sui-Lin Sun

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  1. Liang-Ming Liu
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Correspondence to Ji-Xiang Zhang.

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Liu, LM., Zhang, JX., Luo, J. et al. A Role of Cell Apoptosis in Lipopolysaccharide (LPS)-induced Nonlethal Liver Injury in d-galactosamine (d-GalN)-sensitized Rats. Dig Dis Sci 53, 1316–1324 (2008). https://doi.org/10.1007/s10620-007-9994-y

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  • DOI: https://doi.org/10.1007/s10620-007-9994-y

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