Carbonyl reductase mRNA abundance and enzymatic activity as potential biomarkers of oxidative stress in marine fish

• Carbonyl reductase (CBR) is an enzyme involved in protection from oxidative stress. In rainbow trout (Oncorhynchus mykiss), the hepatic mRNA abundance of the two isoforms (A and B) is increased after exposure to treated sewage effluents, as well as after exposure with beta-naphthoflavone (beta-NF) and the pro-oxidant paraquat In this study, we show that the same chemicals similarly increase the single known hepatic CBR mRNA level and CBR catalytic activity in the coastal living eelpout (Zoarces viviparus). Hepatic CBR mRNA abundance and catalytic activity were also compared between eelpout collected at contaminated and reference sites on the Swedish west coast, but no differences were observed. In conclusion, CBR is a potential biomarker candidate for monitoring the exposure and effects of AhR agonists and/or pro-oxidants in the marine environment, but more research is needed to investigate temporal regulation as well as dose dependency for different chemicals. The mRNA and enzymatic assays presented in this study provide two additional tools for researchers interested in expanding their biomarker battery. (c) 2012 Elsevier Ltd. All rights reserved.

Subject headings

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Keyword

Carbonyl reductase

Biomarker

Biomonitoring

Eelpout

Oxidative stress

AhR-agonists

eelpout zoarces-viviparus

trout oncorhynchus-mykiss

rainbow-trout

20-beta-hydroxysteroid dehydrogenase

gene-expression

coastal waters

nadph binding

pulp-mill

liver

quinone

rlin l

1980

toxicology and applied pharmacology

v54

p420

ochaska hj

1986

journal of biological chemistry

v261

p1372

naka m

1992

journal of biological chemistry

v267

p13451

Publication and Content Type

ref (subject category)

art (subject category)