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Relative potency of chlorinated dibenzo-p-dioxins (CDDs) in acute, subchronic and chronic (carcinogenicity) toxicity studies: implications for risk assessment of chemical mixtures.
Toxicology 77, 39-50 (1993)
This paper shows that the relative toxic potency of four chlorinated dibenzo-p-dioxins (CDDs) is similar in two species with different sensitives (guinea pig, Sprague-Dawley rat). More importantly, it also demonstrates that the toxic potencies of these homologues are very similar for acute, subchronic and chronic dosing in the same species (rat). Furthermore, examination of different endpoints of toxicity (mortality, porphyria, carcinogenicity) suggests that the dose-responses for these diverse endpoints after acute, subchronic, and chronic administration are very similar if not identical for tetra-CCD. Based on toxicokinetic and toxicodynamic considerations, a new, possibly generalizable rule (average tissue concentration x time = toxicity) is derived for CDDs. Implicit in the relative potency arguments of CDDs is the requirement of a practical threshold dose for all endpoints of toxicity including cancer.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Carcinogenicity ; Chlorinated Dibenzo-p-dioxins ; Mixtures ; Porphyria ; Relative Potency ; Risk Assessment ; Threshold
ISSN (print) / ISBN
0300-483X
e-ISSN
0300-483X
Journal
Toxicology
Quellenangaben
Volume: 77,
Issue: 1-2,
Pages: 39-50
Publisher
Elsevier
Non-patent literature
Publications
Reviewing status
Peer reviewed