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2014 ; 142
(2
): 445-54
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Developmental exposure to organophosphate flame retardants elicits overt toxicity
and alters behavior in early life stage zebrafish (Danio rerio)
#MMPMID25239634
Dishaw LV
; Hunter DL
; Padnos B
; Padilla S
; Stapleton HM
Toxicol Sci
2014[Dec]; 142
(2
): 445-54
PMID25239634
show ga
Organophosphate flame retardants (OPFRs) are common replacements for the
phased-out polybrominated diphenyl ethers (PBDEs) and have been detected at high
concentrations in environmental samples. OPFRs are structurally similar to
organophosphate pesticides and may adversely affect the developing nervous
system. This study evaluated the overt toxicity, uptake, and neurobehavioral
effects of tris (1,3-dichloro-2-propyl) phosphate (TDCPP), tris (2-chloroethyl)
phosphate (TCEP), tris (1-chloro-2-propyl) phosphate (TCPP), and tris
(2,3-dibromopropyl) phosphate (TDBPP) in early life stage zebrafish. Chlorpyrifos
was used as a positive control. For overt toxicity and neurobehavioral
assessments, zebrafish were exposed from 0 to 5 days postfertilization (dpf).
Hatching, death, or malformations were evaluated daily. Teratogenic effects were
scored by visual examination on 6 dpf. To evaluate uptake and metabolism,
zebrafish were exposed to 1?然 of each organophosphate (OP) flame retardant and
collected on 1 and 5 dpf to monitor accumulation. Larval swimming activity was
measured in 6 dpf larvae to evaluate neurobehavioral effects of exposures below
the acute toxicity threshold. TDBPP elicited the greatest toxicity at >1?然.
TDCPP and chlorpyrifos were overtly toxic at concentrations ?10?然, TCEP, and
TCPP were not overtly toxic at the doses tested. Tissue concentrations increased
with increasing hydrophobicity of the parent chemical after 24?h exposures. TDCPP
and TDBPP and their respective metabolites were detected in embryos on 5 dpf. For
all chemicals tested, developmental exposures that were not overtly toxic
significantly altered larval swimming activity. These data indicate that OPFRs
adversely affect development of early life stage zebrafish.