منابع مشابه
Minireview CHOLESTEROL - METABOLIZING CYTOCHROMES P 450
By catalyzing the first steps in different pathways of cholesterol degradation, cytochromes P450 (P450s) 7A1, 27A1, 11A1, and 46A1 play key roles in cholesterol homeostasis. CYP7A1 is a microsomal liver-specific enzyme that converts cholesterol to 7 -hydroxycholesterol. CYP27A1 is a ubiquitously expressed mitochondrial P450 that metabolizes cholesterol to 27-hydroxycholesterol. CYP11A1 also res...
متن کاملCellular distribution of cytochromes P-450 in the rat kidney.
The distribution of several cytochrome P-450 (P-450) isoenzymes between proximal tubular (PT) and distal tubular (DT) cells of the rat kidney was determined. Western blot analysis of microsomes prepared from liver and kidney cortical homogenates revealed that CYP2E1 protein was expressed in rat kidney microsomes at approximately 10% of hepatic levels. Microsomes from renal cortical, PT, and DT ...
متن کاملCharacterization of human small intestinal cytochromes P-450.
Human small intestine epithelial cells (enterocytes) provide the first site for cytochrome P-450 (CYP)-catalyzed metabolism of orally ingested xenobiotics. The CYP composition of enterocytes could thus affect the potential toxicity or therapeutic efficacy of xenobiotics by modifying systemic uptake. We have characterized human enterocyte CYP composition to enable assessment of its functional ro...
متن کاملExpression of adrenal cytochromes P-450 in testosterone-induced hypertension.
Chronic treatment of rats with the naturally occurring androgen, testosterone, leads to hypertension and cardiovascular disease. This effect is believed to be mediated through the adrenal gland and in particular by action on the steroid 11 beta-hydroxylase enzyme system. To study the possible mechanism of this effect, the enzyme system was examined at several time periods up to the time that hy...
متن کاملMetabolism of theophylline by cDNA-expressed human cytochromes P-450.
1. Theophylline metabolism was studied using seven human cytochrome P-450 isoforms (CYPs), namely CYP1A1, 1A2, 2A6, 2B6, 2D6, 2E1 and 3A4, and microsomal epoxide hydroxylase (EH), expressed in human B-lymphoblastoid cell lines. 2. At a high theophylline concentration of 10 mM four CYPs (1A1, 1A2, 2D6, 2E1) catalyzed the metabolism of theophylline. 3. Theophylline had the highest affinity (appar...
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ژورنال
عنوان ژورنال: Microbiological Reviews
سال: 1986
ISSN: 0146-0749
DOI: 10.1128/mr.50.3.244-258.1986