Abstract
Claudins have been reported to be differentially regulated in malignancies and implicated in the process of carcinogenesis and tumor progression. Claudin-1 has been described as key factor in the entry of hepatitis C virus (HCV) into hepatocytes and as promoter of epithelial-mesenchymal transition in liver cells. The objective of the current study was to characterize claudin expression in hepatocellular carcinoma (HCC) as well as HCC-surrounding and normal liver samples with respect to cirrhosis and HCV infection. Expression of claudin-1, -2, -3, -4, and −7 was measured by morphometric analysis of immunohistochemistry, and Western blotting in 30 HCCs with 30 corresponding non-tumorous tissues and 6 normal livers. Claudin-1 and −7 protein expression was found significantly elevated in cirrhosis when compared with non-cirrhotic liver. HCCs developed in cirrhotic livers showed even higher expression of claudin-1 contrary to decreased claudin-7 expression when compared with cirrhosis. With reference to HCV status, HCCs or surrounding livers of HCV-infected samples did not show significant alterations in claudin expression when compared with HCV-negative specimens. Cirrhotic transformation associates with elevated claudin-1 and -7 expressions in both non-tumorous liver and HCC. The fact that no significant differences in claudin expression were found regarding HCV-positivity in our sample set suggests that HCV infection alone does not induce a major increase in the total amount of its entry co-factor claudin-1. Increased expression of claudin-1 seems to be a consequence of cirrhotic transformation and might contribute to a more effective HCV entry and malignant transformation.
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Acknowledgments
We would like to express our gratitude to Magdolna Pekar for her precious help in tissue processing and performing immunohistochemistry. This work was supported by grants from the Hungarian Scientific Research Found (OTKA)# K101435.
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Ágnes Holczbauer and Benedek Gyöngyösi equally contributed to the paper.
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Holczbauer, Á., Gyöngyösi, B., Lotz, G. et al. Increased Expression of Claudin-1 and Claudin-7 in Liver Cirrhosis and Hepatocellular Carcinoma. Pathol. Oncol. Res. 20, 493–502 (2014). https://doi.org/10.1007/s12253-013-9683-4
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DOI: https://doi.org/10.1007/s12253-013-9683-4