| Autor: |
B Staels, H Jansen, A van Tol, G Stahnke, H Will, G Verhoeven, J Auwerx |
| Jazyk: |
angličtina |
| Rok vydání: |
1990 |
| Předmět: |
|
| Zdroj: |
Journal of Lipid Research, Vol 31, Iss 7, Pp 1211-1218 (1990) |
| Druh dokumentu: |
article |
| ISSN: |
0022-2275 |
| DOI: |
10.1016/S0022-2275(20)42629-X |
| Popis: |
The influence of development and ethinylestradiol on low density lipoprotein (LDL)-receptor mRNA and hepatic triglyceride lipase (HTGL) activity and mRNA levels was studied in rat liver and intestine. Intestinal LDL-receptor mRNA levels are maximal in the perinatal period, whereas liver LDL-receptor and HTGL mRNA levels are highest after weaning in adult life. All mRNA levels reach a maximum between day 15 and 20 when rats still consume a lipid-rich diet, and increase twofold during weaning. Liver and intestinal LDL-receptor mRNA levels are not influenced by ovariectomy, but increase after ethinylestradiol treatment. Liver LDL-receptor mRNA shows a dose-dependent increase after ethinylestradiol and a sevenfold rise in liver LDL-receptor mRNA is attained with a dose of 2000 micrograms/day. Intestinal LDL-receptor mRNA increases slightly more than twofold after ethinylestradiol and this increase is not dose-dependent. Changes in LDL-receptor mRNA are independent of changes in food intake induced by ethinylestradiol treatment, since they are still observed after pair-feeding. The ethinylestradiol-induced increases in LDL-receptor mRNA levels are reflected by decreased serum apoB levels. HTGL mRNA levels increase after ovariectomy and show a dose-dependent decrease after ethinylestradiol. Pair-feeding abolishes the increase seen after ovariectomy, while the estrogen-mediated decrease is attenuated. These alterations in HTGL mRNA are reflected by similar changes in liver HTGL activity.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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