The role of cytochrome P4501A activity inhibition in three- to five-ringed polycyclic aromatic hydrocarbons embryotoxicity of marine medaka (Oryzias melastigma).
The mode of action of PAHs that causes fish developmental malformations is unclear. The embryotoxicity of marine medaka (Oryzias melastigma) was investigated after individual exposure to three- to five-ring PAHs Phe, Py, and BaP or co-exposure with α-ANF for 18 days. We found that the relationships between EROD induction and developmental deformities of embryos showed a various pattern under different exposure scenarios of Phe, Py, and BaP, which suggested possibly different modes of action in determining the developmental toxicities. As for co-exposure scenarios of each PAH combined with ANF, it showed potentially synergistic effects. The inhibited CYP1A mediated enzyme activity by ANF after co-exposure did not effectively alleviate developmental toxicity of embryo. It showed potentially synergistic effects after co-exposure of marine fish embryos to CYP1A inhibitors and PAH-type CYP1A inducers. Heart deformities in the early life stages of marine medaka were recommended as a biomarker for indicating the extent of PAH pollution.
State Key Laboratory of Marine Environmental Science, Xiamen University, No. 182 Daxue Road, Siming District, Xiamen 361005, China. jlmu@nmemc.gov.cn
Jing-li
JL
Mu
Xin-hong
XH
Wang
Fei
F
Jin
Ju-ying
JY
Wang
Hua-sheng
HS
Hong
D000818:Animals; D001564:Benzo(a)pyrene / Q000633:toxicity; D019363:Cytochrome P-450 CYP1A1 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D004625:Embryo, Nonmammalian / Q000187:drug effects* / Q000378:metabolism; D009990:Oryzias; D010616:Phenanthrenes / Q000633:toxicity; D011084:Polycyclic Aromatic Hydrocarbons / Q000633:toxicity*; D011721:Pyrenes / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D014874:Water Pollutants, Chemical; D001564:Benzo(a)pyrene; C031181:phenanthrene; C030984:pyrene; D019363:Cytochrome P-450 CYP1A1