several cell lines (18) of poorly differentiated rat ascites hepatomas which grown intraperitoneally were analyzed with respect to their mrna levels of gst-p and albumin. the expression of albumin was dramatically decreased and became undetectable in all of the examined hepatomas compared with normal rat liver. the gst-p mrna level in the hepatomas was correlated with their ability for formatio...

A two-dimensional polyacrylamide gel electrophoresis technique is presented for separation of acid-extracted proteins of isolated nucleoli of normal rat liver and Novikoff hepatoma ascites cells. About 100 distinct protein spots were resolved. Comparison of the patterns for normal liver and Novikoff hepatoma revealed nine spots with markedly different intensities in the two patterns. Two spots ...

S-Adenosylmethionine-homocysteine methyltransferase, which catalyzes synthesis of methionine from homocysteine, with the use of S-adenosylmethionine as the methyl donor, is absent in tumor tissue such as rat ascites hepatoma and Morris hepatoma but is present in rat liver homogenate. Absence of the enzymatic activity in tumor cells is not due to the action of an inhibitor. S-Adenosylhomocystein...

BACKGROUND The classification of ascites as 'exudative' and 'transudative' based on ascitic fluid total protein (AFTP) has been challenged in many clinical conditions like cardiac ascites, patients on prolonged diuretic therapy and malignant ascites because it had poor diagnostic efficacy. These drawbacks have led to the development of another approach to classify ascites, which is based on Ser...

Rat hepatoma tissue culture cells have retained only a few liver-specific membrane functions. To find out whether trans formation of these cells led to the appearance of tumor-specific membrane glycoprotein structures, which might also be pres ent in released form in the circulation of tumor-bearing animals, we compared ¡mmunologically the sera and ascites fluids of normal and of hepatoma-bear...

Transplabtable Zajdela rat ascites hepatoma cells, previously considered "nonproducers," synthesize detectable amounts of intracellular alpha-fetoprotein (AFP) and fibrinogen, but fail to secret or release these serum proteins. Evidence for defective secretory mechanisms for serum proteins in these hepatoma cells (a) explains the failure to detect AFP in either the serum or ascitic fluid of rat...

protein tyrosine phosphatases (ptpases) regulate tyrosine phosphorylation of target proteins involved in several aspects of cellular functions. enzyme activities of the ptpases in cytosolic and particulate fractions of rat ascites hepatoma cell lines were determined and compared with those of normal rat liver. our present data revealed that although there was no neoplatic-specific alteration of...

Antisera to nucleoli of Novikoff hepatoma ascites and normal rat liver cells were produced in rabbits by injection of whole, isolated nucleoli. These antisera have been used to compare the nucleolar antigens that were partially fractionated by differential solubilization from nucleoli. Fourteen antigens were detected by these antisera; ten of these antigens were detected by both antisera. Oucht...