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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Thompson, G. M. Demartino, J. A. Chao, Y. S. Kroon, P. A. |
| Abstract | Apolipoprotein B (apoB) is the major protein of plasma very low density lipoprotein (VLDL) and low density lipoprotein (LDL). Here we report the molecular cloning of cDNAs for rabbit liver apoB, by use of the expression vector lambda gt11, and the use of these cDNAs to study the regulation of apoB mRNA levels by dietary cholesterol. The beta-galactosidase-apoB fusion proteins expressed by recombinant clones were identified with guinea pig anti-rabbit LDL antibodies. The cloned cDNAs hybridized to an 18-kilobase mRNA that was present in liver and intestine. Slot blot analysis showed that this mRNA was not present in other tissues studied, with the possible exception of kidney. When rabbits are fed a high-cholesterol diet, they develop severe hypercholesterolemia. Most of the excess cholesterol is contained in beta-VLDL, a cholesteryl ester-rich lipoprotein that contains apoB and apoE. We addressed the question of whether increased apoB mRNA levels, and by inference increased apoB synthetic rates, are responsible for the accumulation of beta-VLDL. A comparison of apoB mRNA levels showed that cholesterol-fed rabbits had lower liver apoB mRNA levels than control rabbits. We suggest that the accumulation of plasma beta-VLDL in cholesterol-fed rabbits is not due to an increased production of beta-VLDL but solely due to a suppression of hepatic LDL receptors. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 14 |
| Volume Number | 83 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1986-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Apolipoproteins B Genetics Cholesterol, Dietary Pharmacology DNA Metabolism Gene Expression Regulation Drug Effects RNA, Messenger Biosynthesis Animals Cloning, Molecular Hypercholesterolemia Lipoproteins, VLDL Liver Rabbits Receptors, LDL Recombinant Proteins Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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