title: Immune and enzyme histochemical studies of a human hepatocellular carcinoma cell line producing hepatitis B surface antigen.
abstract: PLC/PRF/5, a tissue culture cell line derived from a human hepatocellular carcinoma and producing hepatitis B surface antigen (HBsAg), was studied by immune and enzyme histochemical techniques. HBsAg was demonstrated in the cytoplasm and on the surface of tumor cells. The percentage of HBsAg-positive cells in subculture increased with time until almost all cells expressed HBsAg when the monolayer reached confluence. Similar patterns were found for alpha 1-anti-trypsin and carcino-embryonic antigen, whereas alpha-fetoprotein was observed only in small foci of cells. Hepatitis B core antigen and albumin were not detected. gamma-Glutamyl transferase activity was markedly increased in the tumor cells, whereas adenosine triphosphatase and glucose-6-phosphatase activities were not demonstrable. Patterns of antigenic expression and enzyme phenotype of PLC/PRF/5 cells show remarkable resemblance to those observed in vivo in human hepatocellular carcinoma. Therefore, this cell line may be a useful model to study the control and modulation of both oncofetal antigens and HBsAg.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D006528:Carcinoma, Hepatocellular / Q000201:enzymology / Q000276:immunology*; D002460:Cell Line; D005952:Glucose-6-Phosphatase / Q000378:metabolism; D006514:Hepatitis B Surface Antigens; D006651:Histocytochemistry; D006801:Humans; D008113:Liver Neoplasms; D013194:Staining and Labeling; D000515:alpha 1-Antitrypsin; D005723:gamma-Glutamyltransferase
chemical_list: D006514:Hepatitis B Surface Antigens; D000515:alpha 1-Antitrypsin; D005723:gamma-Glutamyltransferase; D005952:Glucose-6-Phosphatase; D000251:Adenosine Triphosphatases