Many organic compounds, when administered to laboratory animals, induce a number of hepatic enzyme activities. Several patterns of enzyme induction, i.e. distinctive pleiotropic responses are produced by xenobiotics, and these compounds can be classified on this basis. We are interested in three classes of xenobiotics: 1) 2,3,7,8-tetrachlorodibenzo-p-dioxins (TCDD) and related halogenated aromatic hydrocarbons; 2) phenobarbital and phenobarbital-like inducers; and 3) 2(3)-tert-butyl-4-hydroxyanisole (BHA). The induction of the microsomal monooxygenase, aryl hydrocarbon hydroxylase (AHH) activity, and other coordinately expressed enzymes, and the characteristic toxic responses of TCDD, appear to be mediated through the stereospecific binding of TCDD to a cytosol receptor, the product of the Ah locus. We plan to study the properties of this receptor, the pleiotropic responses it mediates, and how this is related to the toxicity of TCDD. We plan to characterize the phenobarbital response and compare the responses produced by a potent new phenobarbital-like agonist. Using this radiolabeled phenobarbital-like agonist, we propose to search in vitro for a binding species, that has the properties expected of the putative receptor for phenobarbital. BHA induces hepatic epoxide hydratase and glutathione-S-transferase activities. We plan to examine related compounds and establish a structure-activity relationship. We propose to screen mice for genetic polymorphism in their responses to BHA or in the structural genes expressed by this compound.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Research Project (R01)
Project #
5R01ES001884-11
Application #
3249614
Study Section
Chemical Pathology Study Section (CPA)
Project Start
1977-09-01
Project End
1991-01-31
Budget Start
1987-02-01
Budget End
1988-01-31
Support Year
11
Fiscal Year
1987
Total Cost
Indirect Cost
Name
University of Wisconsin Madison
Department
Type
Schools of Medicine
DUNS #
161202122
City
Madison
State
WI
Country
United States
Zip Code
53715
Poland, A; Palen, D; Glover, E (1994) Analysis of the four alleles of the murine aryl hydrocarbon receptor. Mol Pharmacol 46:915-21
Pollenz, R S; Sattler, C A; Poland, A (1994) The aryl hydrocarbon receptor and aryl hydrocarbon receptor nuclear translocator protein show distinct subcellular localizations in Hepa 1c1c7 cells by immunofluorescence microscopy. Mol Pharmacol 45:428-38
Burbach, K M; Poland, A; Bradfield, C A (1992) Cloning of the Ah-receptor cDNA reveals a distinctive ligand-activated transcription factor. Proc Natl Acad Sci U S A 89:8185-9
Poland, A; Glover, E; Bradfield, C A (1991) Characterization of polyclonal antibodies to the Ah receptor prepared by immunization with a synthetic peptide hapten. Mol Pharmacol 39:20-6
Poland, A; Glover, E (1990) Characterization and strain distribution pattern of the murine Ah receptor specified by the Ahd and Ahb-3 alleles. Mol Pharmacol 38:306-12
Poland, A; Teitelbaum, P; Glover, E (1989) [125I]2-iodo-3,7,8-trichlorodibenzo-p-dioxin-binding species in mouse liver induced by agonists for the Ah receptor: characterization and identification. Mol Pharmacol 36:113-20
Poland, A; Teitelbaum, P; Glover, E et al. (1989) Stimulation of in vivo hepatic uptake and in vitro hepatic binding of [125I]2-lodo-3,7,8-trichlorodibenzo-p-dioxin by the administration of agonist for the Ah receptor. Mol Pharmacol 36:121-7
Bradfield, C A; Poland, A (1988) A competitive binding assay for 2,3,7,8-tetrachlorodibenzo-p-dioxin and related ligands of the Ah receptor. Mol Pharmacol 34:682-8
Perdew, G H; Poland, A (1988) Purification of the Ah receptor from C57BL/6J mouse liver. J Biol Chem 263:9848-52
Poland, A; Glover, E (1988) Ca2+-dependent proteolysis of the Ah receptor. Arch Biochem Biophys 261:103-11

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