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U.S. Department of Energy
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Investigation of the mechanism of toxicity of 2,3,7,8-tetrachlorodibenzo-p-dioxin and related halogenated polyaromatic hydrocarbons

Thesis/Dissertation ·
OSTI ID:6991421
The toxicity of (/sup 3/H)-2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) and the related halogenated polyaromatic hydrocarbons (PAHs) is presumed to be mediated by a cytosolic receptor, the Ah receptor. However, for a large number of receptor agonists, there is not strict correlation between toxicity and relative ligand binding affinity. Therefore, the possibility that the variance in toxicity was due to differences in the ability of various ligands to activate the cytosolic receptor was investigated. The five radioligands used in the study, (/sup 3/H)2,3,7,8-TCDD, (/sup 3/H)2,3,7,8-Tetrachlorodibenzofuran (TCDF), (/sup 3/H)1,2,3,7,8-Pentachlorodibenzofuran (PCDF), (/sup 3/H)1,2,3,6,7,8-Hexachlorodibenzo-furan (HCDF),and (/sup 3/H)Tetrachlorodibenzofuran-2-(TCDF-2), were of similar affinity: 0.44 nM, 1.3 nM, 5.2 nM, 2.3 nM, and 4.1 nM, respectively.
Research Organization:
Texas A and M Univ., College Station (USA)
OSTI ID:
6991421
Country of Publication:
United States
Language:
English