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6th Internet World Congress for Biomedical Sciences

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Invited Symposium: The Therapeutic Potential of Phase II Enzyme Induction (4 Presentations in this Symposium)

Antioxidant regulation of genes encoding enzymes that detoxify xenobiotics and carcinogens.

S. Dhakshinamoorthy(1), D. Bloom(2), Anil Jaiswal(3)
(1)(2)Department of Pharmacology. Baylor College of Medicine. - Houston. United States
(3)Baylor College of Medicine - Houston. United States

[ABSTRACT] [Antioxidants and their Mode of Action] [Induction of Genes Encoding Enzymes that Detoxify Xenobiotics and Carcinogens.] [Antioxidant Response Element] [Figures] [Figures-2] [Antioxidant Response Element-Binding Proteins] [Summary and Conclusions] [Acknowledgements] [References] [Discussion Board]
Antioxidant Response Element Previous: Phase II Enzyme Symposium Introduction Figures-2
Next: Glutathione deficiencies exacerbate response to stroke.

Figures

Fig.1
Fig. 1. Initial and accumulatory effects of chemically induced superoxide and electrophiles.

 

Fig.2
Fig. 2. Antioxidant and xenobiotic inducible genes.

 

Fig.3
Fig. 3. Alignment of antioxidant response elements (AREs) from seven genes. The TRE and TRE-like elements, their orientations and ´GC´ box are indicated. ARE core sequence was determined by alignment and mutational studies.

 

Fig.4
Fig. 4. Antioxidant response element (ARE) binding proteins. A. Human NQO1 gene ARE-binding proteins. B. Important functional domains of NF-E2 related factors (Nrf1 and Nrf2). CNC, Cap and collar domain.

 

Fig.5
Fig. 5. Effect of overexpression of nuclear proteins Nrf1 and Nrf2 on hARE-mediated CAT gene expression. The Hep-G2 cells were co-transfected with 10 mg of reporter plasmid hARE-tk-CAT (left panel) and various concentrations (mg) of expression LNCX-Nrf1R and LNCX-Nrf2R (containing Nrf1 and Nrf2 cDNA in reverse orientation) and LNCX-Nrf1C and LNCX-Nrf2C (containing Nrf1 and Nrf2 cDNA in correct orientation) in separate experiments as shown. Five mg of RSV-b-galactosidase plasmid was used in each case as control of transfection efficiency. Forty eight hours after the transfection, the cells were analyzed for b-galactosidase and CAT activities.

 


Discussion Board
Discussion Board

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[ABSTRACT] [Antioxidants and their Mode of Action] [Induction of Genes Encoding Enzymes that Detoxify Xenobiotics and Carcinogens.] [Antioxidant Response Element] [Figures] [Figures-2] [Antioxidant Response Element-Binding Proteins] [Summary and Conclusions] [Acknowledgements] [References] [Discussion Board]

Antioxidant Response Element Previous: Phase II Enzyme Symposium Introduction Figures-2
Next: Glutathione deficiencies exacerbate response to stroke.
S. Dhakshinamoorthy, D. Bloom, Anil Jaiswal
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