title: Renal cortical drug and xenobiotic metabolism following urinary tract obstruction.
abstract: Renal cortical metabolism of drugs and xenobiotics was assessed with microsomes prepared from normal, contralateral and 4-day postobstructive hydronephrotic kidneys. Microsomal mixed-function oxidase and prostaglandin H synthase systems were determined in control and 3-methylcholanthrene-treated rabbits. Cytochrome P450 content and biphenyl-4-hydroxylase activity but not cytochrome c reductase activity were reduced in the hydronephrotic kidney. 3-Methylcholanthrene treatment increased cytochrome P450 content and biphenyl-4-hydroxylase and acetanilide-4-hydroxylase activities in normal, contralateral, and hydronephrotic kidneys. However, even after 3-methylcholanthrene treatment, hydronephrotic kidney cytochrome P450 content and acetanilide-4-hydroxylase activity were not more than 20% of the corresponding normal kidney values. Prostaglandin H synthase metabolism of benzidine was observed in the hydronephrotic kidney but was at the limit of detection in normal or contralateral kidneys with or without 3-methylcholanthrene treatment. Characteristics of benzidine metabolism were consistent with the hydroperoxidase rather than the fatty acid cyclooxygenase activity of prostaglandin H synthase. Therefore, hydronephrosis alters the drug and xenobiotic metabolic profile of the renal cortex from a primarily mixed-function oxidase-dependent system to one with the potential for metabolism by the hydroperoxide component of prostaglandin H synthase.
mesh_terms: D000818:Animals; D016718:Arachidonic Acid; D001095:Arachidonic Acids / Q000378:metabolism; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism; D001560:Benzidines / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D006869:Hydronephrosis / Q000378:metabolism*; D007672:Kidney Cortex / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D008861:Microsomes / Q000378:metabolism; D006899:Mixed Function Oxygenases / Q000378:metabolism; D009251:NADPH-Ferrihemoprotein Reductase / Q000378:metabolism; D010084:Oxidation-Reduction; D004364:Pharmaceutical Preparations / Q000378:metabolism*; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism; D011817:Rabbits; D014517:Ureteral Obstruction / Q000378:metabolism*
chemical_list: D001095:Arachidonic Acids; D001560:Benzidines; D004364:Pharmaceutical Preparations; D016718:Arachidonic Acid; C029876:benzidine; D008748:Methylcholanthrene; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D001189:Aryl Hydrocarbon Hydroxylases; C023738:acetanilide hydroxylase; C019793:biphenyl-4-hydroxylase; D011451:Prostaglandin-Endoperoxide Synthases; D009251:NADPH-Ferrihemoprotein Reductase