Increased drug-metabolizing activity without increased cytochrome P-450 in rats treated with phenolic antioxidants
نویسندگان
چکیده
منابع مشابه
Hormonal regulation of cytochrome P-450-dependent monooxygenase activity and epoxide-metabolizing enzyme activities in testis of hypophysectomized rats.
Since the male gonad is a target organ of both pituitary hormones and androgens, the present study was performed to determine whether testicular aryl hydrocarbon hydroxylase (AHH), epoxide hydrase (EH), and glutathione transferase activities and cytochrome P-450 levels were regulated by follicle-stimulating hormone (FSH), luteinizing hormone (LH), and testosterone. Intact, sham-operated control...
متن کاملCytochrome P-450-dependent xenobiotic metabolizing activity in Zymbal's gland, a specialized sebaceous gland of rodents.
Homogenates of Zymbal's glands from beta-naphthoflavone-treated rats and mice have 7-ethoxycoumarin O-deethylase activity, while those from rats also have aryl hydrocarbon hydroxylase activity. Measured concentrations of cytochrome P-450 in microsomes from Zymbal's glands of beta-naphthoflavone-treated rats are not higher than those from untreated rats. Studies of inhibitors of 7-ethoxycoumarin...
متن کاملCompetition between cytochrome P-450 isozymes for NADPH-cytochrome P-450 oxidoreductase affects drug metabolism.
NADPH-cytochrome P-450 oxidoreductase (CPR) is essential for the catalytic activity of cytochrome P-450 (P-450). On a molar basis, the amount of P-450 exceeds that of CPR in human liver. In this study, we investigated whether drug-drug interactions can occur as a result of competition between P-450 isozymes for this ancillary protein. For this purpose, combinations of P-450 isozymes were coexpr...
متن کاملMalathion-increased Hepatotoxicity in Diabetic Rats
Background: Malathion (MT), an organophosphorus pesticide, induces hepatotoxicity and is associated with hyperglycemia and the development of diabetes mellitus. Objectives: This study was aimed to evaluate the effects of sub-acute exposure to sub-lethal dose of MT in the liver of diabetic rats. Methods: Non-diabetic and streptozotocin-induced diabetic rats received MT at a dose of 150 mg/kg...
متن کاملMultiple Forms of Cytochrome P-450 in Phenobarbital- and 3-Methylcholanthrene-treated Rats
Multiple forms of liver microsomal cytochrome P-450 isolated from immature male rats pretreated with phenobarbital or 3-methylcholanthrene are described. A fraction. of low specific content (Fraction A, 1.7 to 4.0 nmol of cytochrome P-450 per mg of protein) and a fraction substantially purified (Fraction B, 9.0 to 11.0 mnol of cytochrome P-450 per mg of protein) are obtained by DEAE-cellulose c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biochemical Journal
سال: 1969
ISSN: 0306-3283
DOI: 10.1042/bj1150059pa