| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 2049234 | FEBS Letters | 2010 | 6 Pages |
Abstract
Redox state of pyridine nucleotides of the endoplasmic reticulum (ER) lumen was determined in different nutritional conditions. NADPH-dependent cortisone reduction and NADP+-dependent cortisol oxidation were measured in rat liver microsomes, by utilizing the luminal 11β-hydroxysteroid dehydrogenase type 1 activity. Cortisone reduction decreased, while cortisol oxidation increased during onward starvation, showing that the luminal NADPH/NADP+ ratio was substantially decreased. Cortisone or metyrapone addition caused a smaller decrease in NADPH fluorescence in microsomes from starved rats. The results demonstrate that nutrient supply is mirrored by the redox state of ER luminal pyridine nucleotides.
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Authors
Éva Kereszturi, Fanni S. Kálmán, Tamás Kardon, Miklós Csala, Gábor Bánhegyi,