• Adriano Barreto Nogueira, Ariel Barreto Nogueira, Anderson Lino Costa, Fabiana Roberto Lima, Sheila Aparecida Siqueira, and Manoel Jacobsen Teixeira.
• Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brasil.
• Sao Paulo Med J. 2015 Mar 1; 133 (2): 135140135-40.

Context And ObjectiveNestin, a class VI intermediate filament protein, is highly expressed in the portal mesenchyme and sinusoidal endothelium of the human fetal liver, but scarcely expressed in adult portal vessel endothelium. During experimental liver regeneration, an increased number of nestin-positive parenchymal cells have been observed in the zone adjacent to the Hering canals. These parenchymal cells are regarded as hepatic stem cells or hepatoblasts, which may be involved in hepatocellular carcinogenesis. In the light of recent reports describing nestin-positive parenchymal cells in hepatocellular carcinoma, we aimed to use this tumor type as a positive control for immunohistochemical detection of nestin.Design And SettingExperimental study conducted at a university hospital.MethodsHepatocellular carcinoma sections from one case were analyzed for nestin expression by immunohistochemistry using confocal microscopy.ResultsSurprisingly, a conspicuous pattern resembling liver sinusoid-like cytoarchitecture was observed upon nestin staining of endothelial cells.ConclusionsThis pattern has not been previously described. The preliminary results shown here suggest that nestin-positive endothelial cells are located in niches of immature or proliferative cells. Moreover, nestin expression in endothelial cells of hepatocellular carcinoma enhances the role of angiogenesis in this tumor type, although the prevalence of this immunohistopathological pattern remains to be determined. Finally, hepatocellular carcinoma is an effective positive control for nestin staining in fluorescent immunohistochemistry.

17 keywords...

hide…