Transfer and effects of 1,2,3,5,7-pentachloronaphthalene in an experimental food chain.
Polychlorinated naphthalenes are environmentally relevant compounds that are measured in biota at concentrations in the μg/kg lipid range. Despite their widespread occurrence, literature data on the accumulation and effects of these compounds in aquatic ecosystems are sparsely available. The goal of this study was to gain insights into the biomagnification and effects of 1,2,3,5,7-pentachloronaphthalene (PeCN52) in an experimental food chain consisting of benthic worms and juvenile rainbow trout. Worms were contaminated with PeCN52 by passive dosing from polydimethylsiloxane silicone. The contaminated worms were then used to feed the juvenile rainbow trout at 0.12, 0.25 or 0.50 μg/g fish wet weight/day, and the resulting internal whole-body concentrations of the individual fish were linked to biological responses. A possible involvement of the cellular detoxification system was explored by measuring PeCN52-induced expression of the phase I biotransformation enzyme gene cyp1a1 and the ABC transporter gene abcb1a. At the end of the 28-day study, biomagnification factors were similar for all dietary intake levels with values between 0.5 and 0.7 kg lipid(fish)/kg lipid(worm). The average uptake efficiency of 60% indicated that a high amount of PeCN52 was transferred from the worms to the fish. Internal concentrations of up to 175 mg/kg fish lipid in the highest treatment level did not result in effects on survival, behavior, or growth of the juvenile trout, but were associated with the induction of phase I metabolism which was evident from the significant up-regulation of cyp1a1 expression in the liver. In contrast, no changes were seen in abcb1a transcript levels.
['Slootweg|Tineke|T|', 'Segner|Helmut|H|', 'Mayer|Philipp|P|', 'Smith|Kilian|K|', 'Igumnova|Elizaveta|E|', 'Nikiforov|Vladimir|V|', 'Dömötörová|Milena|M|', 'Oehlmann|Jörg|J|', 'Liebig|Markus|M|']
D000818:Animals D019363:Cytochrome P-450 CYP1A1 D004305:Dose-Response Relationship, Drug D020387:Food Chain D015971:Gene Expression Regulation, Enzymologic D009281:Naphthalenes D009835:Oligochaeta D017686:Oncorhynchus mykiss D014874:Water Pollutants, Chemical
Polychlorinated naphthalenes Rainbow trout Passive dosing CYP1A1 ABCB1 Dietary exposure Juvenile growth test