Back to Search
Start Over
Endocrine effects of hexabromocyclododecane (HBCD) in a one-generation reproduction study in Wistar rats.
- Source :
-
Toxicology letters [Toxicol Lett] 2009 Feb 25; Vol. 185 (1), pp. 51-62. Date of Electronic Publication: 2008 Dec 07. - Publication Year :
- 2009
-
Abstract
- The brominated flame retardant (BFR) hexabromocyclododecane was tested in a one-generation reproduction assay in Wistar rats, enhanced for endocrine parameters. A solution of the compound in corn oil was mixed in the feed, targeting at dietary exposure of 0-0.1-0.3-1-3-10-30-100 mg/kg body weight/day (mkd) in parental rats during 10 (males) or 2 (females) weeks premating, during gestation and lactation, and in their F1 offspring from weaning until final necropsy. Effects were assessed in F1 animals. Livers of these animals showed increased HBCD concentrations, in a dose-dependent way. The trabecular bone mineral density of the tibia was dose-dependently decreased in females (BenchMark Dose Lower confidence bound, BMDL=0.056 mkd). The IgG response after immunization with sheep red blood cells (SRBC) was increased in males (BMDL=0.46 mkd). Further sensitive effects were decreased weight of the testis (BMDL=1.5 mkd), increased fraction of neutrophilic granulocytes (BMDL=7.7 mkd), decreased concentration of apolar retinoids in female livers (BMDL=1.3 mkd), and decreased plasma alkaline phosphatase in females (BMDL=8.6 mkd). CYP19/aromatase activity in the ovary was correlated to the concentration of gamma-HBCD in the liver. A developmental origin of these effects is considered, and this is also true for sensitive effects observed in neurobehavioural testing in littermates from the same experiment, i.e. in the brainstem auditory evoked potentials and in a catalepsy test [Lilienthal, H., Van der Ven, L.T.M., Piersma, A.H., Vos, J.G. Neurobehavioral effects of the brominated flame retardant hexabromocyclododecane (HBCD) in rats after pre- and postnatal exposure, in press]. The low BMDLs of these effects may raise concern for human health, particularly when based on body burdens of HBCD, which leads to critical margins of exposure particularly for the occupational setting.
- Subjects :
- Animals
Body Burden
Body Weight drug effects
Dose-Response Relationship, Drug
Eating drug effects
Female
Gonadal Steroid Hormones physiology
Immune System drug effects
Liver drug effects
Liver metabolism
Male
Organ Size drug effects
Pregnancy
Rats
Retinoids metabolism
Spermatozoa drug effects
Endocrine Disruptors toxicity
Fetus drug effects
Flame Retardants toxicity
Hydrocarbons, Brominated toxicity
Reproduction drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 0378-4274
- Volume :
- 185
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Toxicology letters
- Publication Type :
- Academic Journal
- Accession number :
- 19118610
- Full Text :
- https://doi.org/10.1016/j.toxlet.2008.12.003