Hyperglycernia down-regulates apolipoprotein M expression in vivo and in vitro
Author
Summary, in English
Diabetes is associated with low concentrations of apoM in plasma. In db/db mice, ob/ob mice as well as in the alloxan-induced diabetic mouse, the low apoM levels are paralleled by decreased expression of the apoM gene. In the latter model, insulin substitution tended to reverse the low apoM expression. It is not known whether the impairment in apoM expression can be ascribed to hyperglycemia, insulin deficiency or insulin resistance. In the present study, we investigated apoM levels and expression in rats rendered hyperglycemic by short-term glucose infusion. As expected, serum insulin concentrations rose moderately during the infusions. Serum apoM concentrations and hepatic apoM mRNA levels were significantly reduced in the hyperglycemic rats, indicating that the low expression of apoM in these diabetic models can be ascribed to hyperglycemia rather than to insulin deficiency or insulin resistance. However, in HepG2 cells both glucose and insulin markedly inhibited apoM expression these effects were additive. Thus, the possible effects of insulin in vivo seem to be mediated indirectly.
Department/s
Publishing year
2007
Language
English
Pages
879-882
Publication/Series
Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids
Volume
1771
Issue
7
Document type
Journal article
Publisher
Elsevier
Topic
- Pharmacology and Toxicology
- Medicinal Chemistry
Keywords
- apolipoprotein M
- hyperglycemia
- insulin
- diabetes
- glucose
Status
Published
ISBN/ISSN/Other
- ISSN: 1388-1981