Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 74, Issue 1, Pages 157-163Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2010.08.040
Keywords
Canis familiaris; Endocrine disruption; T3; T4; Thyroxine; Thyroid; PCB; Organohalogen contaminants; Sledge dog
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Funding
- Danish Cooperation for Environment in the Arctic
- Natural Science and Engineering Research Council (NSERC) Canada
- Lundbech Foundation
- IDEXX/MedVetLab
- Royal Canin
- Kruuse ApS
- EU
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As a model of high trophic level carnivores, sledge dogs were fed from 2 to 18 months of age with minke whale blubber containing organohalogen compounds (OHC) corresponding to 128 mu g PCB/day. Controls were fed uncontaminated porcine fat. Thyroid hormone levels were assessed in 7 exposed and 7 control sister bitches (sampled at age 6-18 months) and 4 exposed and 4 control pups, fed the same diet as their mothers (sampled age 3-12 months). Lower free and total T3 and 14 were seen in exposed vs. control bitches beyond 10 months of age, and total 13 was lower through 3-12 months of age in exposed pups. A negative correlation with thyroid gland weight was significant for Sigma DDT, as was a positive association with total 13 for dieldrin. This study therefore supports observational data that OHCs may adversely affect thyroid functions, and it suggests that OHC exposure duration of 10 months or more may be required for current OHC contamination levels to result in detectable adverse effects on thyroid hormone dynamics. (C) 2010 Elsevier Inc. All rights reserved.
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