LIPOGENIC ENZYME AND APOPROTEIN MESSENGER-RNAS IN LONG-TERM PRIMARY CULTURE OF CHICKEN HEPATOCYTES

Hepatocytes isolated from 9-week-old chickens were cultured in a serum -free, hormonally defined medium. Relative amounts of mRNAs coding for lipogenic enzymes (acetyl-CoA carboxylase, fatty acid synthase, DELTA 9 desaturase, malic enzyme) and apoproteins (apoprotein A1 and apoprot ein B) were determined until the 12th day. beta-actin and albumin mRNA , as well as albumin secretion, were also assessed. Cellular metabolic activity appeared to be very low for the first days of culture, but i ncreased after the 7th day. All the mRNAs studied, except for that of malic enzyme, were present from this time throughout the culture lifes pan. The biological significance of the observed results and the relev ance of this chicken hepatocyte culture system for long-term metabolic and genetic studies are discussed.