Biomaterial Database

Expression of differentiated functions in hepatoma cell hybrids: selection in glucose-free media of segregated hybrid cells which reexpress gluconeogenic enzymes. 1977

R Bertolotti

Selective glucose-free media have been used to study the reexpression of liver-specific gluconeogenic enzymes in rat hepatoma X mouse lymphoblastoma somatic hybrids. The utilization for gluconeogenesis of dihydroxyacetone or oxaloacetate requires two enzymes: fructose diphosphatase as well as either triokinase for the former or phosphoenolpyruvate carboxykinase for the latter. By sequential selection with these substrates, the reexpression of the three gluconeogenic enzymes has been dissociated. The reexpression of these enzymes is correlated with the loss of mouse chromosomes. In addition, the characterization of the parental forms of aldolase B, another liver-specific enzyme, shows that reexpression corresponds to the simultaneous production of the rat and mouse enzymes. These results demonstrate the chromosomal origin of extinction and suggest that activation of mouse silent genes which accompanies reexpression can occur without loss of the parental determinations. The hypothesis that determination involves regulatory rather than structural genes is discussed.

UI	MeSH Term	Description	Entries
D007621	Karyotyping	Mapping of the KARYOTYPE of a cell.	Karyotype Analysis Methods,Analysis Method, Karyotype,Analysis Methods, Karyotype,Karyotype Analysis Method,Karyotypings,Method, Karyotype Analysis,Methods, Karyotype Analysis
D008113	Liver Neoplasms	Tumors or cancer of the LIVER.	Cancer of Liver,Hepatic Cancer,Liver Cancer,Cancer of the Liver,Cancer, Hepatocellular,Hepatic Neoplasms,Hepatocellular Cancer,Neoplasms, Hepatic,Neoplasms, Liver,Cancer, Hepatic,Cancer, Liver,Cancers, Hepatic,Cancers, Hepatocellular,Cancers, Liver,Hepatic Cancers,Hepatic Neoplasm,Hepatocellular Cancers,Liver Cancers,Liver Neoplasm,Neoplasm, Hepatic,Neoplasm, Liver
D010101	Oxygen Consumption	The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)	Consumption, Oxygen,Consumptions, Oxygen,Oxygen Consumptions
D010729	Phosphoenolpyruvate Carboxykinase (GTP)	An enzyme of the lyase class that catalyzes the conversion of GTP and oxaloacetate to GDP, phosphoenolpyruvate, and carbon dioxide. This reaction is part of gluconeogenesis in the liver. The enzyme occurs in both the mitochondria and cytosol of mammalian liver. (From Dorland, 27th ed) EC 4.1.1.32.	GTP-Dependent Phosphoenolpyruvate Carboxykinase,Carboxykinase, GTP-Dependent Phosphoenolpyruvate,GTP Dependent Phosphoenolpyruvate Carboxykinase,Phosphoenolpyruvate Carboxykinase, GTP-Dependent
D010770	Phosphotransferases	A rather large group of enzymes comprising not only those transferring phosphate but also diphosphate, nucleotidyl residues, and others. These have also been subdivided according to the acceptor group. (From Enzyme Nomenclature, 1992) EC 2.7.	Kinases,Phosphotransferase,Phosphotransferases, ATP,Transphosphorylase,Transphosphorylases,Kinase,ATP Phosphotransferases
D002460	Cell Line	Established cell cultures that have the potential to propagate indefinitely.	Cell Lines,Line, Cell,Lines, Cell
D003470	Culture Media	Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN.	Media, Culture
D005634	Fructose-Bisphosphate Aldolase	An enzyme of the lyase class that catalyzes the cleavage of fructose 1,6-biphosphate to form dihydroxyacetone phosphate and glyceraldehyde 3-phosphate. The enzyme also acts on (3S,4R)-ketose 1-phosphates. The yeast and bacterial enzymes are zinc proteins. (Enzyme Nomenclature, 1992) E.C. 4.1.2.13.	Aldolase,Fructosediphosphate Aldolase,Aldolase A,Aldolase B,Aldolase C,Fructose 1,6-Bisphosphate Aldolase,Fructose 1,6-Bisphosphate Aldolase, Class II,Fructose 1-Phosphate Aldolase,Fructose Biphosphate Aldolase,Fructosemonophosphate Aldolase,1,6-Bisphosphate Aldolase, Fructose,Aldolase, Fructose 1,6-Bisphosphate,Aldolase, Fructose 1-Phosphate,Aldolase, Fructose Biphosphate,Aldolase, Fructose-Bisphosphate,Aldolase, Fructosediphosphate,Aldolase, Fructosemonophosphate,Fructose 1 Phosphate Aldolase,Fructose 1,6 Bisphosphate Aldolase,Fructose Bisphosphate Aldolase
D005943	Gluconeogenesis	Biosynthesis of GLUCOSE from nonhexose or non-carbohydrate precursors, such as LACTATE; PYRUVATE; ALANINE; and GLYCEROL.
D006528	Carcinoma, Hepatocellular	A primary malignant neoplasm of epithelial liver cells. It ranges from a well-differentiated tumor with EPITHELIAL CELLS indistinguishable from normal HEPATOCYTES to a poorly differentiated neoplasm. The cells may be uniform or markedly pleomorphic, or form GIANT CELLS. Several classification schemes have been suggested.	Hepatocellular Carcinoma,Hepatoma,Liver Cancer, Adult,Liver Cell Carcinoma,Liver Cell Carcinoma, Adult,Adult Liver Cancer,Adult Liver Cancers,Cancer, Adult Liver,Cancers, Adult Liver,Carcinoma, Liver Cell,Carcinomas, Hepatocellular,Carcinomas, Liver Cell,Cell Carcinoma, Liver,Cell Carcinomas, Liver,Hepatocellular Carcinomas,Hepatomas,Liver Cancers, Adult,Liver Cell Carcinomas