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• W2068362029 abstract "The mammalian aromatic hydrocarbon (Ah) receptor is a soluble protein involved in the regulation of gene expression by halogenated aromatic hydrocarbons such as 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Little is known, however, about the presence and properties of this receptor in nonmammalian species. In these studies, we sought evidence for an Ah receptor in the liver or liver-equivalent of diverse species of invertebrate and vertebrate animals. Velocity sedimentation analysis of hepatic cytosol labeled with [3H]TCDD gave equivocal results with three species of marine fish. In subsequent studies, photoaffinity labeling with 2-azido-3-[125I]iodo-7,8-dibromodibenzo-p-dioxin was used to identify the Ah receptor. Specific labeling (labeling that could be displaced by an excess of unlabeled ligand) was observed in seven species of teleost and elasmobranch fish, including winter flounder (Pleuronectes americanus), killifish (Fundulus heteroclitus), scup (Stenotomus chrysops), rainbow trout (Oncorhynchus mykiss), brown trout (Salmo trutta), and dogfish (Mustelus canis and Squalus acanthias). Specific labeling was also found in cytosolic fractions prepared from PLHC-1 fish hepatoma cells and livers of a turtle (Chrysemys picta) and a cetacean, the beluga whale Delphinapterus leucas. The fish Ah receptor was sensitive to conditions of tissue preparation; inclusion of proteinase inhibitors in the homogenization buffer stabilized the receptor in some species. There was heterogeneity in the apparent molecular mass of the largest specifically labeled band in each species; these ranged from 105 to 146 kDa, slightly larger on average than mammalian Ah receptors (95-130 kDa). In contrast to the results obtained with teleost and elasmobranch fish, no specifically labeled polypeptides were detectable in cytosol from two agnathan fish species (hagfish Myxine glutinosa and sea lamprey Petromyzon marinus), the tunicate Ciona intestinalis, or any of nine other invertebrate species representing eight classes in four phyla. Overall these results suggest that the Ah receptor evolved at least 450 million years ago, prior to the divergence of bony and cartilaginous fishes. Although the exact relationship between receptor presence and dioxin responsiveness in these species is uncertain, our data predict that the invertebrate species examined in this study, which appear to lack an Ah receptor protein like that seen in mammals and fish, may be less sensitive than vertebrates to the effects of environmental contaminants that act through this transcriptional regulator." @default.
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• W2068362029 date "1994-04-01" @default.
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• W2068362029 title "Photoaffinity Labeling of the Ah Receptor: Phylogenetic Survey of Diverse Vertebrate and Invertebrate Species" @default.
• W2068362029 doi "https://doi.org/10.1006/abbi.1994.1160" @default.
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