Toxic effects of bleached and unbleached paper mill effluents in primary cultures of rainbow trout hepatocytes.

Abstract:

:Toxic effects of unbleached (sulfate or sulfite) and bleached (sulfate) paper mill effluents were studied in a primary culture of rainbow trout liver cells. The effluents and control water from a clean area were extracted with diethyl ether and added to the cultures dissolved in dimethyl sulfoxide. Plasma membrane integrity was studied by measuring lactate dehydrogenase (LDH) leakage. The cellular content of glutathione (GSH) was used as an indicator of oxidative stress and the formation of reactive intermediates. Dose-response studies indicated that unbleached effluents contained more potent toxic substances than bleached effluents. Both unbleached and bleached effluents contained organic diethyl ether-extractable substances which increased cytochrome P450-dependent 7-ethoxyresorufin-O-deethylase (EROD) activities. The inducing effects were seen at concentrations substantially lower than those decreasing GSH content and increasing LDH leakage. Possible EROD inducing substances in bleached effluents are chlorinated organic compounds. Inducing compounds in unbleached effluents are yet to be identified. Furthermore, at higher concentrations the effluents contained substances that inhibited the cytochrome P450 system. The results show that the trout primary hepatocyte cultures afford a convenient in vitro method for screening cytochrome P450 inducing components extracted from industrial effluents to investigate mechanisms by which wastewaters cause injury in cells.

journal_name

Ecotoxicol Environ Saf

authors

Pesonen M,Andersson T

doi

10.1016/0147-6513(92)90036-3

keywords:

subject

Has Abstract

pub_date

1992-08-01 00:00:00

pages

63-71

issue

1

eissn

0147-6513

issn

1090-2414

pii

0147-6513(92)90036-3

journal_volume

24

pub_type

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