European eel (Anguilla anguilla) elvers were intraperitoneally injected with different doses of 3,3',4,4'-tetrachlorobiyphenyl (PCB77) to examine and characterize the inductive effect of coplanar PCBs on CYP1A1 gene expression in liver and gills by using a semi-quantitative RT-PCR analysis. The influence of PCB77 injection on transcription activity of the housekeeping gene glyceraldehyde-3-phosphate-dehydrogenase (GAPDH) was tested to determine its suitability as a reference gene for further quantitative gene expression analyses. Our results clearly indicate a significant dose-dependent increase in CYP1A1 gene expression in the gills of European eel, while in liver tissues a significant elevation in CYP1A1 gene expression was only detectable at highest contamination rates, indicating the potential of CYP1A1 differential gene expression analysis in gills as a biomarker for PCB contamination in eels. PCB77 contamination did not affect GAPDH transcription in gills but, at highest doses, resulted in a significant elevation in liver, speaking against GAPDH as a reference housekeeping gene after PCB exposure.
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