Details

Autor(en) / Beteiligte

• Brown, Barbara L.
• Allis, John W.
• Simmons, Jane Ellen
• House, Dennis E.

Titel

Fasting for less than 24 h induces cytochrome P450 2E1 and 2B1/2 activities in rats

Ist Teil von

• Toxicology letters, 1995-11, Vol.81 (1), p.39-44

Ort / Verlag

Shannon: Elsevier Ireland Ltd

Erscheinungsjahr

1995

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Cytochrome P450 (CYP) 2E1 activity is induced after 24 h of fasting but no information is available for shorter fasting periods. We investigated the induction of CYP 2E1, 2B1/2 and 1A1 m young adult male F344 rats after 8, 16 and 24 h of fasting compared to control. Liver microsomes were analyzed for the following enzyme activities: p-nitrophenol hydroxylase (PNP) for CYP 2E1, pentoxyresorufin-0-dealkylase(PROD) for CYP 2B1/2 and ethoxyresorufin- O-deethylase (EROD) for CYP 1A1. After each fasting interval, the activities per mg microsomal protein for PNP and PROD increased but the activity of EROD remained unchanged. Western blots for CYP 2E1 and CYP 2B1 showed increases comparable to the PNP and PROD activities, respectively. On a whole organ basis, increases were found for PNP and PROD activities, while decreases were found for EROD activity and total microsomal protein. The results are consistent with an induction of CYP 2E1 and CYP 2B1/2 activities after as little as 8 h of fasting.