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Mammalian and teleost cell line bioassay and chemically derived 2,3,7,8‐tetrachlorodibenzo‐ p ‐dioxin equivalent concentrations in lake trout ( Salvelinus namaycush ) from Lake Superior and Lake Ontario, North America
Author(s) -
Whyte Jeff J.,
van den Heuvel Mike R.,
Clemons Janine H.,
Huestis Susan Y.,
Servos Mark R.,
Dixon D. George,
Bols Niels C.
Publication year - 1998
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620171112
Subject(s) - bay , salvelinus , rainbow trout , trout , congener , bioassay , environmental chemistry , chemistry , fish <actinopterygii> , biology , ecology , fishery , geology , oceanography
For livers of lake trout from three Great Lakes sites, the 2,3,7,8‐tetrachlorodibenzo‐ p ‐dioxin (TCDD) equivalent concentrations (TEQs) were determined in four ways. Bioassay‐derived (BD) TEQs were measured with rat (H4IIE) and rainbow trout (RTL‐W1) cell lines, and chemistry‐derived (CD) TEQs were calculated with TCDD equivalency factors (TEFs) derived with H4IIE and RTL‐W1. Generally, BD‐TEQs and CD‐TEQs for individual samples did not differ significantly for either H4IIE or RTL‐W1, indicating that all of the AhR‐active compounds in a sample were accounted for by the congener analysis and that these compounds acted in an additive fashion in both mammalian and piscine systems. However, contributions of individual chemicals to overall CD‐TEQs differed with H4IIE and RTL‐W1 TEFs, and for some individual samples, TEQs did depend on the method used. Hepatic TEQs and ethoxyresorufin‐ O ‐deethylase (EROD) levels differed significantly between sites. For TEQs, the order was Glenora > Jackfish Bay > Black Bay; for EROD activity, the order was Jackfish Bay > Glenora = Black Bay. No correlation was found between hepatic TEQs and EROD activity, which suggests that the two measurements are evaluating different but related consequences of contaminant exposure.