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Embryotoxicity of retene in cotreatment with 2-aminoanthracene, a cytochrome P4501A inhibitor, in rainbow trout (Oncorhynchus mykiss).

Abstract：

:Environmentally relevant mixtures of polycyclic aromatic hydrocarbons (PAHs; e.g., crude oils) are often rich in alkyl-PAHs, such as retene (7-isopropyl-1-methylphenanthrene), which produce dioxin-like toxicity in fish embryos. The mechanism of alkyl-PAH toxicity is not well understood but was previously thought to be mediated by cytochrome P4501A (CYPIA) enzymes. To understand the role of CYP1A in retene toxicity, we coexposed free-swimming rainbow trout (Oncorhynchus mykiss) embryos to 100 microg/L of retene and to a range of concentrations of 2-aminoanthracene (2AA; a known CYP1A inhibitor). Ethoxyresorufin-O-deethylase (EROD) assays of juvenile trout coexposed to 2AA and retene confirmed that 2AA inhibited CYP1A (median inhibitory concentration [IC50] for 2AA, 62 microg/L). In two independent trials, 2AA, both alone and in cotreatment with retene, produced a concentration-dependent increase in toxicity to embryonic trout. The toxicity resulting from 2AA alone is, to our knowledge, the first reported for embryonic stages of fish, with median lethal concentrations (LC50s) of 19 and 125 microg/L and overall sublethal median effective concentrations (EC50s) of 17 and 38 microg/L. Toxicity increased in embryos coexposed to retene and 2AA, resulting in LC50s of 14 and 17 microg/L of 2AA and overall EC50s of 7 and 3 microg/L of 2AA. The exposure-response curves for 2AA alone and for 2AA with retene were parallel, suggesting a common mode of action between the two treatment regimes and between retene and 2AA. Taken together with the juvenile EROD data, the toxicity of 2AA alone and in cotreatment with retene may be EROD (CYP1A) independent. The mixture toxicity was not consistent with previous coexposures to CYP1A inducers and inhibitors, suggesting that the current risk assessment model may not be a good predictor of PAH mixture toxicity.

journal_name

Environ Toxicol Chem

journal_title

Environmental toxicology and chemistry

authors

Scott JA,Ross M,Lemire BC,Hodson PV

doi

10.1897/08-461.1

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

1304-10

issue

eissn

0730-7268

issn

1552-8618

pii

08-461

journal_volume

pub_type

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Embryotoxicity of retene in cotreatment with 2-aminoanthracene, a cytochrome P4501A inhibitor, in rainbow trout (Oncorhynchus mykiss).