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Endocrine effects of hexabromocyclododecane (HBCD) in a one-generation reproduction study in Wistar rats.

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.

journal_name

Toxicol Lett

journal_title

Toxicology letters

authors

van der Ven LT,van de Kuil T,Leonards PE,Slob W,Lilienthal H,Litens S,Herlin M,Håkansson H,Cantón RF,van den Berg M,Visser TJ,van Loveren H,Vos JG,Piersma AH

doi

10.1016/j.toxlet.2008.12.003

subject

Has Abstract

pub_date

2009-02-25 00:00:00

pages

51-62

issue

1

eissn

0378-4274

issn

1879-3169

pii

S0378-4274(08)01360-X

journal_volume

185

pub_type

杂志文章

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