Hepatocarcinogenesis in non-cirrhotic liver is associated with a reduced number of clonal hepatocellular patches in non-tumorous liver parenchyma

Authors


  • No conflicts of interest were declared.

Alexander C. Adam, Institut fürr Pathologie, Universität zu Köln, Kerpener Strasse 62, D-50969 Köln, Germany. e-mail: alexander.adam@uk-koeln.de

Abstract

We investigated circumscribed cell proliferations in healthy livers in comparison to non-cirrhotic livers bearing hepatocellular carcinoma. Using histochemical staining for cytochrome c oxidase, the fourth complex of the respiratory chain, we visualized patch-forming descendents of regeneratively active liver cells. The clonal nature of these patches was verified by laser-capture microdissection and Sanger sequencing of the enzyme's core subunits in patches carrying marker mutations on the mtDNA. We demonstrate a highly significant increase of the patch size and also a highly significant increase in the number of patches carrying marker mutations between hepatocellular carcinoma-free and -bearing livers. Thus, the carcinoma-bearing livers accumulated more genetic damage on mtDNA than the control group. Furthermore, for the first time, we present evidence in hepatocellular carcinoma-bearing non-cirrhotic livers of a significantly reduced pool of regeneratively active liver cells that are genetically and functionally altered. The analogy to ageing-related changes is suggestive of premature ageing of stem cells in non-cirrhotic hepatocellular carcinoma-bearing liver as an early step to hepatocarcinogenesis. Copyright © 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.

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