Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:1.6.5.2 (NQO1)
 6,196 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The metabolism of chemical carcinogens was investigated in liver preparations from 28 captive woodchucks (Marmota monax). Of these, 23 were naturally infected with the woodchuck hepatitis virus (WHV), and eight also had primary hepatocellular carcinoma (PHC). Twenty-nine parameters were investigated in liver subcellular fractions, including cross-reactivity with HBsAg, and biochemical parameters, such as gamma-glutamyl transpeptidase, cytochrome P-450 and microsomal monooxygenases (aryl hydrocarbon hydroxylase, ethoxycoumarin and ethoxyresorufin deethylases, aminopyrine and dimethylnitrosamine demethylases, and testosterone 7 alpha-, 16 alpha- and 6 beta-hydroxylases), uridine 5'-diphosphoglucuronosyl transferase, GSH and related enzymes (peroxidase, reductase and S-transferase), as well as other cytosolic enzyme activities (glucose 6-phosphate and 6-phosphogluconate dehydrogenases, NADPH- and NADH-dependent diaphorases, and DT diaphorase). In addition, liver preparations were used in order to quantify the metabolic activation into bacterial mutagens of five procarcinogens (aflatoxin B1, the pyrolysis products Trp-P-2 and MeIQ, 2-aminofluorene and dimethylnitrosamine) and the decrease of potency of three direct-acting mutagens (sodium dichromate, ICR 191 and 4-nitroquinoline 1-oxide). WHV infection produced a significant stimulation of carcinogen metabolism, as shown by the simultaneous change in detoxification parameters (GSH depletion) and activation indices (enhancement of microsomal monooxygenases and of procarcinogen activation into mutagenic metabolites). There were no significant differences between WHV-positive samples from animals without PHC and the noncancerous tissue of PHC-bearing animals, whereas a decrease of both activation and detoxification indices was recorded in the tumorous tissue. There was a considerable interindividual variability among WHV carriers, which was tentatively ascribed to genetic factors. Pregnancy was the only known factor influencing the results in WHV carriers. However, even by excluding pregnant animals, the effects on carcinogen metabolism produced by WHV infection were still statistically significant. These results, together with previous data obtained in humans, revealed that metabolic factors may play a role in the synergism between viral hepatitis and chemical hepatocarcinogens in the etiopathogenesis of PHC.
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PMID:Enhanced metabolic activation of chemical hepatocarcinogens in woodchucks infected with hepatitis B virus. 272 Sep 3

The usual histologic pattern in acute viral hepatitis (AVH) includes cellular abnormalities predominantly in the perivenular (zone 3) hepatocytes and changes interpreted as representing regenerative activity in the periportal (zone 1) hepatocytes. Enzyme histochemical and ultrastructural studies of livers of 12 patients with AVH were undertaken to see whether these features support the concept of regeneration of hepatocytes in zone 1. The swollen hepatocytes in the perivenular areas were hydropic, with dilated or eccentric rough endoplasmic reticulum and decreased or vesicular smooth endoplasmic reticulum; correspondingly, the glucose-6-phosphatase activity (reflecting, when present, intact and functional endoplasmic reticulum) was markedly decreased. Succinic dehydrogenase and diphosphopyridine nucleotide diaphorase activities, representing mitochondrial enzymes, were limited to the perinuclear or pericanalicular cytoplasm of swollen hepatocytes. gamma-Glutamyl transpeptidase activity was increased. The periportal hydropic hepatocytes were small and arranged in clusters displacing sinusoids. Ultrastructurally, these hepatocytes had nearly normal organelles but scanty smooth endoplasmic reticulum. Activities of the enzymes glucose-6-phosphatase, succinic dehydrogenase, and diphosphopyridine nucleotide diaphorase were weak, although glycogen was abundant. gamma-Glutamyl transpeptidase activity was scanty in these hepatocytes. These findings from enzyme histochemical and electron microscopic studies could be interpreted as evidence of functional deterioration of perivenular swollen hepatocytes and relative functional immaturity of periportal hydropic clustered hepatocytes, suggesting regeneration of zone 1 hepatocytes.
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PMID:Acute viral hepatitis: morphologic and functional correlations in human livers. 669 43

The study was carried out to analyze dynamics of diaphorase and esterase activity ofneutrophils of blood in patients with chronic viral hepatitis C of lower degree of activity depending on gender characteristics in dynamics of treatment. The examination and treatment were organized concerning sampling of 113 patients with chronic viral hepatitis C of lower degree of activity. The diaphorase and esterase activity of neutrophils in dynamics of treatment was detected The analysis of diaphorases was carried out according R.P. Nartsissov technique. The content of esterase was estimated by V.M. Wachstein-FG. Wolf technique. The count of results was implemented using Kaplow semiquantitative technique. In patients with chronic viral hepatitis C of lower degree of activity prior to treatment the activity of NAD-diaphorase was lowered both in males and females. The activity of NADF-diaphorase prior to treatment significantly exceeded standard in males and matched standard in females. The application of basic therapy resulted in qualitative redistribution of cellular composition of reacting cells. All of them reacted following medium degree of activity (b). At that, average cytochemical indicator of reaction was normal in males and in females increasing of activity was observed. The activity og both diaphorases after application of complex therapy (basic therapy and cycloferon) totally returned to normality both in males and females. The esterase activity prior to treatment was decreased in males and increased in females (alpha-naphthylacetate esterase) and vice versa (alpha-naphthylbutyrate esterase) was increased in males and decreased infemales. After application of basic therapy in males increasing of esterase activity was registered and total redistribution of qualitative composition of reacting neutrophils (from degree "a" to degree "b"). In females after treatment the activity of alpha-naphthylacetate esterase was decreased and alpha-naphthylbutyrate esterase was increased. The redistribution of qualitative composition of cells was absent. The application of cycloferon brings to normality the activity of alpha-naphthylbutyrate esterase in males and activity of diaforaselpha- naphthylacetate esterase in females. In patients with chronic viral hepatitis C of lower degree of activity the differences in diaphorase and esterase activity ofneutrophils depending on gender characteristics in dynamics of treatment are observed.
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PMID:[The enzyme activity of neutrophils of blood in patients with chronic viral hepatitis C depending on gender characteristics]. 2602 57