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Role of β-catenin in hepatocarcinogenesis of rats |
Qi-Ming Wang, Kai-Ming Yang, Hong-Ying Zhou, Zhen-Hai Yu, Xiao Li and Hui-Jun Yang |
Chengdu, China
Author Affiliations: Department of Human Anatomy, Huaxi Medical Centre of Sichuan University (Wang QM, Yang KM, Zhou HY, Yu ZH and Yang HJ), and Department of Radiology, West China Hospital of Sichuan University (Li X), Chengdu 610041, China
Corresponding Author: Qi-Ming Wang, MD, Department of Human Anatomy, Huaxi Medical Centre of Sichuan University, Chengdu 610041, China (Tel: 86-28-66886157; Fax: 86-28-85501670; Email: wangqiming-6@163.com) |
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Abstract BACKGROUND: β-catenin has two distinct roles in E-cadherin mediated cell adhesion and carcinogenesis by activating the wnt/β-catenin signaling pathway. One occurs at the cell-adhesion site, where cadherins are linked to the actin-based cytoskeleton. The other takes place in the cytoplasm and nuclei and is thought to regulate cell transformation. We studied the role of β-catenin in hepatocarcinogenesis of rats.
METHODS: Fresh liver specimens were obtained from normal rats, and atypical hyperplasia livers and hepatocarcinoma tissues from model rats. The changes of β-catenin in gene expression levels were detected by reverse transcriptase polymerase chain reaction (RT-PCR) in the different specimens separately. At the same time, their localization was observed immunohistochemically.
RESULTS: In the normal liver specimens, β-catenin staining was seen in the cell membrane. In liver specimens of atypical hyperplasia, β-catenin staining occurred in the cell cytoplasm of some cells as well as in the cell membrane of others. Immunohistochemically cancerous tissues showed the presence of β-catenin in the cytoplasm and nuclei. RT-PCR revealed that the gene expression levels of β-catenin were same in all samples.
CONCLUSIONS: The accumulation of β-catenin in the cytoplasm and/or nuclei frequently occurs in hepatocarcinogenesis of rats. It may be an early event in the development of hepatocarcinoma of rats.
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