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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
The effect of cancerogenic azo dye Sudan I on expression of biotransformation enzymes
 Hejduková, Žaneta ; Svášková, Dagmar (advisor) ; Dračínská, Helena (referee)
Sudan I is a widely used azo dye which has the ability to cause carcinomas in organs and tissues of experimental animals. During reactions catalyzed by microsomal monooxygenase enzyme systems or cytoplasmic biotransformation enzymes, Sudan I is oxidized to reactive metabolites that covalently bind to nucleic acids and cause their damage. Sudan I can also be metabolized by reduction, e. g. by a DT-diaphorase enzyme (NQO1). Reduction of Sudan I is considered to be a detoxification reaction. In this work, the in vivo action of Sudan I is examined in terms of its ability to induce an expression of the biotransformation enzyme DT-diaphorase in tissues of rats treated with the azo dye. The aim of this work was to quantify the degree of NQO1 induction at mRNA level. After the isolation of total RNA from organs of rats treated with Sudan I, the RNA was converted to cDNA by reverse transcription using random hexamers as primers. Using specific probes, the abundance of mRNA for the enzyme NQO1 in the organs of treated rats was quantified by "real-time" PCR, relatively to the control gene with a constant expression (β-actin). Through comparing thus determined amounts of mRNA in individual organs of treated and untreated rats, it has been found that Sudan I had caused a significant increase in the expression...
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The effect of cancerogenic azo dye Sudan I on expression of biotransformation enzymes
 Hejduková, Žaneta ; Dračínská, Helena (referee) ; Svášková, Dagmar (advisor)
Sudan I is a widely used azo dye which has the ability to cause carcinomas in organs and tissues of experimental animals. During reactions catalyzed by microsomal monooxygenase enzyme systems or cytoplasmic biotransformation enzymes, Sudan I is oxidized to reactive metabolites that covalently bind to nucleic acids and cause their damage. Sudan I can also be metabolized by reduction, e. g. by a DT-diaphorase enzyme (NQO1). Reduction of Sudan I is considered to be a detoxification reaction. In this work, the in vivo action of Sudan I is examined in terms of its ability to induce an expression of the biotransformation enzyme DT-diaphorase in tissues of rats treated with the azo dye. The aim of this work was to quantify the degree of NQO1 induction at mRNA level. After the isolation of total RNA from organs of rats treated with Sudan I, the RNA was converted to cDNA by reverse transcription using random hexamers as primers. Using specific probes, the abundance of mRNA for the enzyme NQO1 in the organs of treated rats was quantified by "real-time" PCR, relatively to the control gene with a constant expression (β-actin). Through comparing thus determined amounts of mRNA in individual organs of treated and untreated rats, it has been found that Sudan I had caused a significant increase in the expression...
Detailed record

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