Expression of the protein phosphatases PP1a and PP1g1 in rat ascites hepatoma cell lines and in rat hepatocyte cell line

Abstract

Expressions of protein phosphatases 1a (PP1a), and 1g1 (PP1g1) was determined in cultured rat ascites hepatoma cell lines (AH-13, AH-109A) and in the normal rat hepatocyte cell line RLN-B2 by Northern blot analysis. High levels of PP1a mRNA expression were observed only in the hepatoma cells. In RLN-B2 cells only PP1g1 mRNA was increased compared to normal rat liver. In all cell types, mRNA levels of PP1g1 decreased as a function of harvest time. The present data show that PP1a mRNA is expressed at high levels in hepatoma cells in vivo, but rapidly decreased under critical nutritional conditions.