Molecular characterization of cytochrome P450 1A and 3A and the effects of perfluorooctanoic acid on their mRNA levels in rare minnow (Gobiocypris rarus) gills.
Perfluorooctanoic acid (PFOA), a potentially toxic perfluorinated compound (PFC), has been widely disseminated in the environment. In the present study, rare minnows (Gobiocypris rarus) exposed to PFOA exhibited histopathological gill damage, including epithelial hyperplasia of the lamellae, inflammatory cell infiltration, and lamellar fusion. Cytochrome P450s (CYPs) play a central role in the metabolism and biotransformation of a wide range of endogenous substrates and foreign compounds. Thus, we studied the CYPs and the effects of waterborne PFOA on their corresponding mRNA levels in the gills of rare minnows. Two novel CYP cDNAs (CYP1A and CYP3A) were identified in rare minnow and their mRNAs were ubiquitously expressed in all tissues examined. Upregulation of CYP3A mRNA was observed in the gills of male rare minnows exposed to 30mg/L PFOA, while no significant changes occurred in exposed females. In contrast, down regulation of CYP1A mRNA was detected in the gills of male and female minnows exposed to PFOA. However, the effect of PFOA on gill mRNA levels of their potential regulators, aryl hydrocarbon receptor (AhR) for CYP1A, and pregnane X receptor (PXR) for CYP3A, were not consistent with the observed effects of PFOA on the corresponding CYP mRNA concentrations. This suggests a different or more complex transcriptional regulation of CYP expression following PFOA exposure.
Liu
Yong
Y
Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, PR China.
Wang
Jianshe
J
Wei
Yanhong
Y
Zhang
Hongxia
H
Liu
Yang
Y
Dai
Jiayin
J
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002210:Caprylates / Q000494:pharmacology*; D003530:Cyprinidae / Q000235:genetics / Q000378:metabolism*; D019363:Cytochrome P-450 CYP1A1 / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D051544:Cytochrome P-450 CYP3A / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism; D018076:DNA, Complementary / Q000235:genetics / Q000302:isolation & purification; D005260:Female; D005466:Fluorocarbons / Q000494:pharmacology*; D005880:Gills / Q000187:drug effects / Q000201:enzymology* / Q000473:pathology; D008297:Male; D008969:Molecular Sequence Data; D000077297:Pregnane X Receptor; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D011897:Random Allocation; D018336:Receptors, Aryl Hydrocarbon / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D011987:Receptors, Steroid / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D015398:Signal Transduction / Q000187:drug effects
D002210:Caprylates; D018076:DNA, Complementary; D005466:Fluorocarbons; D000077297:Pregnane X Receptor; D012333:RNA, Messenger; D018336:Receptors, Aryl Hydrocarbon; D011987:Receptors, Steroid; C023036:perfluorooctanoic acid; D019363:Cytochrome P-450 CYP1A1; D051544:Cytochrome P-450 CYP3A