Journal Article

Apolipoprotein B Production and Very Low Density Lipoprotein Secretion by Calf Liver Slices

Dominique Gruffat-Mouty, Benoit Graulet, Denys Durand, Marie-Elisabeth Samson-Bouma and Dominique Bauchart

in The Journal of Biochemistry

Published on behalf of The Japanese Biochemical Society

Volume 126, issue 1, pages 188-193
Published in print July 1999 | ISSN: 0021-924X
Published online July 1999 | e-ISSN: 1756-2651 | DOI: https://dx.doi.org/10.1093/oxfordjournals.jbchem.a022421

Show Summary Details

Preview

Secretion of triglycerides by the liver in ruminants as components of very low density lipoproteins particles is low as compared with that in primates or rodents. The rate-limiting steps for the hepatic export of very low density lipoproteins have been studied in liver slices to determine the origin of the low lipotropic capacity of calf liver compared to that of rat liver. The rates of production of apolipoprotein B (apo B) and albumin as well as the rate of secretion of VLDL-apolipoproteins were measured during 12-h incubation of liver slices in organo-culture using [35S]methionine-cysteine labeling. Hepatic apo B production was similar in the two animal species but the VXDL-apolipoprotein secretion rate for calf liver slices amounted to only 20% of that observed for rat liver slices. Although calf and rat liver slices synthesized similar amounts of total protein, the hepatic production of albumin, measured in cells and media, was much higher in calf than rat liver slices (around 2.7-fold), whereas the rate secretion of albumin was similar in the two species. Our results showed that the slow rate of secretion of VLDL by calf liver cells was not consecutive to a low rate of synthesis of apo B but rather to a defect in VLDL assembly and/or secretion.

Keywords: apolipoprotein B; calf; liver; rat; VLDL

Journal Article.  0 words. 

Subjects: Biochemistry