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Gen Comp Endocrinol. 2014 Sep 1;205:185-96. doi: 10.1016/j.ygcen.2014.06.015. Epub 2014 Jun 27.

Alkylphenolic contaminants in the diet: Sparus aurata juveniles hepatic response.

Author information

1
Department of Earth, Environment and Life Sciences (DiSTAV), University of Genoa, Italy; Interuniversity Consortium INBB, Rome, Italy. Electronic address: traversiilaria@gmail.com.
2
Department of Environment and Life Sciences, University of Marche, Ancona, Italy.
3
Department of Earth, Environment and Life Sciences (DiSTAV), University of Genoa, Italy.
4
Department of Environment and Life Sciences, University of Marche, Ancona, Italy; Interuniversity Consortium INBB, Rome, Italy.
5
Department of Earth, Environment and Life Sciences (DiSTAV), University of Genoa, Italy; Interuniversity Consortium INBB, Rome, Italy.

Abstract

A wide range of endocrine disrupter chemicals can mimic steroid hormones causing adverse health effects. Nonylphenol (NP) and t-octhylphenol (t-OP) are man-made alkylphenolic environmental contaminants possessing controversial endocrine disruption properties. This study has investigated the effects of NP and t-OP enriched diets on hepatic tissue and biotransformation activities in the liver. To this aim, sea bream juveniles were fed with commercial diet enriched with three different doses of NP (NP1: 5mg/kg bw, NP2: 50mg/kg bw and NP3: 100mg/kg bw) or t-OP (t-OP1: 5mg/kg bw, t-OP2: 50mg/kg bw and t-OP3: 100mg/kg bw) for 21 days. A significant increase of the hepatosomatic index was observed in NP1 and t-OP1. Alteration of liver morphology was observed in both NP and t-OP exposed juveniles although the most altered endpoints were observed in t-OP2 with 100% of tissue degeneration. Ethoxyresorufin-O-deethylase activity was significantly inhibited by NP and t-OP (p<0.05), while catalase activity was significantly induced, at both doses. A different pattern of protein expression of different isoforms of both vitellogenin and zona radiata protein was evidenced within the treatments. In addition, a significant increase in the abundance of the stress induced heat shock protein 70 gene in the liver of t-OP2 fish and a significant increase in the abundance of the estrogen induced cathepsin D gene in the liver of NP1 and t-OP2 fish, were observed. Finally, estradiol-17β (E2) and testosterone (T) plasma levels and E2/T showed significantly different patterns in NP and t-OP exposed against control fish.

KEYWORDS:

4-Tert-octylphenol; Biomarkers; Morphological endpoints; Nonylphenol; Sea bream juveniles

PMID:
24975542
DOI:
10.1016/j.ygcen.2014.06.015
[Indexed for MEDLINE]

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