Effects of pentachlorophenol on the detoxification system in white-rumped munia (Lonchura striata).
Pentachlorophenol (PCP), a priority pollutant due to its persistence and high toxicity, has been used worldwide as a pesticide and biocide. To understand the adverse effects of PCP, adult male white-rumped munias (Lonchura striata) were orally administrated commercial PCP mixed with corn oil at dosages of 0, 0.05, 0.5, and 5mg/(kg·day) for 42day. Gas chromatography-mass spectrometry (GC-MS) analysis found that PCP was preferentially accumulated in the kidney rather than in the liver and muscle in all exposure groups. To examine the function of CYP1A in pollutant metabolism, we isolated two full-length cDNA fragments (designated as CYP1A4 and CYP1A5) from L. striata liver using reverse transcription-polymerase chain reaction and rapid amplification of cDNA ends. PCP induced the expression of CYP1A5, although no obvious change was observed in CYP1A4 expression. Furthermore, PCP significantly elevated the activities of ethoxyresorufin O-deethylase and methoxyresorufin O-demethylase and decreased the activity of benzyloxy-trifluoromethyl-coumarin, with no significant responses observed in benzyloxyresorufin O-debenzylase. PCP induced significant changes in antioxidant enzyme (superoxide dismutase and catalase) activities and malondialdehyde content, but decreased glutathione peroxidase (GSH-Px) and glutathione S-transferase activities and GSH content in the liver of L. striata. The present study demonstrated that PCP had hepatic toxic effects by affecting CYP1As and anti-oxidative status.
Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: jiangpeng@ioz.ac.cn.
Peng
P
Jiang
Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.
Jianshe
J
Wang
Beijing Zoo, Beijing 100044, China.
Jinguo
J
Zhang
Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China. Electronic address: daijy@ioz.ac.cn.
Jiayin
J
Dai
D000818:Animals; D001189:Aryl Hydrocarbon Hydroxylases / Q000378:metabolism; D019363:Cytochrome P-450 CYP1A1 / Q000378:metabolism; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D004785:Environmental Pollutants / Q000633:toxicity*; D005982:Glutathione Transferase / Q000378:metabolism; D008658:Inactivation, Metabolic / Q000187:drug effects*; D007668:Kidney / Q000378:metabolism; D008099:Liver / Q000378:metabolism; D008297:Male; D009132:Muscles / Q000378:metabolism; D046109:Passeriformes / Q000502:physiology*; D010416:Pentachlorophenol / Q000633:toxicity*
D004785:Environmental Pollutants; D003577:Cytochrome P-450 Enzyme System; D010416:Pentachlorophenol; C076307:methoxyresorufin-O-demethylase; D001189:Aryl Hydrocarbon Hydroxylases; D019363:Cytochrome P-450 CYP1A1; C108015:cytochrome P-450 CYP1A5; D005982:Glutathione Transferase
Alkoxyresorufin O-dealkylase; Antioxidant enzyme; CYP1A4; CYP1A5; Lonchura striata