ArticleZhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences2015
[Expression of gap junction protein connexin 26 in human hepatocellular carcinoma and its significance].
Article in Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveTo investigate the expression of gap junction protein connexin 26(Cx26) in hepatocellular carcinoma(HCC) and its significance.
methodsThe expression of Cx26 in liver tissue was examined by immunohistochemistry staining in 159 paraffin-embeded liver sections, including 20 samples of normal liver tissue, 30 samples of chronic hepatitis, 33 samples of liver cirrhosis, and 76 samples of HCC. Normal hepatic cell line LO2 and HCC cell line SMMC-7721 were used in vitro to verify the characteristics of gap junction and Cx26 expression pattern. The expression and localization of Cx26 were measured by Western blotting and immunofluorescence assay, respectively. The function of gap junction between adjacent cells was detected by dye transfer assay.
resultsCompared to normal liver samples, the positive rate of Cx26 was markedly decreased in hepatitis, cirrhosis and HCC tissues(all P<0.05). The intensity of Cx26 staining was significantly increased in HCC tissues compared with those in non-carcinomatous liver(NCL) tissues(all P<0.05). In NCL tissues, there was a mild to moderated staining of Cx26 which located mainly on the membranes of hepatocytes at intercellular contacts. The positive staining of Cx26 in HCC tissues was observed mainly in cytoplasm. Positive Cx26 expression was positively associated with tumor size(P=0.036), but not with age, gender, histologic grade, clinical stage, underlying hepatitis and cirhosis, lymph node metastasis and intrahepatic vascular embolism(all P>0.05). Compared with LO2 cells, an aberrant expression and distribution of Cx26 in SMMC-7721 cells was confirmed, which may lead to a decreased function of gap junctions.
conclusionsThe aberrant expression and distribution of Cx26 protein may be associated with hepatocarcinogenesis, and the residual gap junction in HCC may provide a new target for treatment of HCC.
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