title: Antipyrine metabolism in acute hepatic porphyria in relapse and remission.
abstract: Antipyrine kinetics following a single oral dose were obtained in porphyric patients in attack and in remission and in controls. The clearance of antipyrine was significantly lower during an acute porphyric attack (median: 0.34 ml min-1 kg-1; range: 0.1-0.71, P less than 0.05) than in patients in remission (median: 0.53 ml min-1 kg-1; range: 0.28-0.87) or controls (median: 0.52 ml min-1 kg-1; range: 0.32-0.93). There was a significant negative correlation between weight-adjusted antipyrine clearance and the urinary excretion of the porphyrin precursors, delta-aminolaevulinic acid (r = 0.86, P less than 0.001) and porphobilinogen (r = 0.82, P less than 0.002). These data suggest that the more severe the porphyric attack, the greater the impairment of hepatic monooxygenase activity.
mesh_terms: D000624:5-Aminolevulinate Synthetase / Q000097:blood; D000293:Adolescent; D000328:Adult; D000368:Aged; D000622:Aminolevulinic Acid / Q000652:urine; D000983:Antipyrine / Q000378:metabolism*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D005260:Female; D006801:Humans; D008107:Liver Diseases / Q000201:enzymology*; D008297:Male; D008657:Metabolic Clearance Rate; D008875:Middle Aged; D006899:Mixed Function Oxygenases / Q000378:metabolism; D011162:Porphobilinogen / Q000652:urine; D011164:Porphyrias / Q000201:enzymology*; D011166:Porphyrins / Q000652:urine
chemical_list: D011166:Porphyrins; D011162:Porphobilinogen; D000622:Aminolevulinic Acid; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D000624:5-Aminolevulinate Synthetase; D000983:Antipyrine