TY - JOUR T1 - Induction of cytochrome P450 2E1 expression in rat and gerbil astrocytes by inflammatory factors and ischemic injury. JF - Molecular Pharmacology JO - Mol Pharmacol SP - 1065 LP - 1072 VL - 50 IS - 5 AU - N Tindberg AU - H A Baldwin AU - A J Cross AU - M Ingelman-Sundberg Y1 - 1996/11/01 UR - http://molpharm.aspetjournals.org/content/50/5/1065.abstract N2 - Hepatic cytochromes P450 are known to be down-regulated by cytokines, lipopolysaccharide, Gram-positive bacteria, and viruses. Little is known, however, about the regulation by inflammation of cytochromes P450 in other tissues. We have found that lipopolysaccharide and interleukin-1 beta stimulate the expression of catalytically active CYP2E1 (but not CYP1A1 or CYP2B) up to 7-fold in rat brain primary cortical glial cultures. The induction reached a maximum after 24 hr and was accompanied by an increase in CYP2E1 mRNA. Chlormethiazole, a specific inhibitor of hepatic CYP2E1 transcription, completely inhibited the induction of CYP2E1 at the mRNA and enzyme levels. Immunofluorescence studies showed CYP2E1 to be expressed in a subset of astrocytes in the lipopolysaccharide-stimulated cortical glial cultures. Using a model of global ischemic injury in the gerbil, we found CYP2E1 to be induced in vivo in astrocytes in the inflammatory phase, 1-3 weeks after the lesion. Likewise, CYP2E1 was induced in the rat cortex 1 week after a focal ischemic injury. Our results suggest tissue-specific regulation of CYP2E1 by inflammatory factors and that CYP2E1 may play a role in astrocytes during inflammation in the brain. ER -