In vitro metabolism of 3,3',4,4'-tetrachlorobiphenyl in relation to ethoxyresorufin-O-deethylase activity in liver microsomes of some wildlife species and rat.
Eur J Pharmacol 1994;
270:253-61. [PMID:
8039554 DOI:
10.1016/0926-6917(94)90069-8]
[Citation(s) in RCA: 40] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A qualitative study was performed of the capacity of hepatic microsomes of several wildlife species to metabolize 3,3',4,4'-tetrachlorobiphenyl (TCB). Hepatic microsomes of species environmentally exposed to polychlorinated biphenyls (PCBs): harbour porpoise (Phocoena phocoena), harbour seal (Phoca vitulina), common tern (Sterna hirundo), and hepatic microsomes from species experimentally exposed to PCBs: eider duck (Somateria mollissima), rainbow trout (Salmo gairdneri), flounder (Platichthys flesus), and Wistar rat, were incubated with 14C-labelled TCB ([14C]TCB). The mammals and birds were able to metabolize TCB at a rate that correlated with their ethoxyresorufin-O-deethylase (EROD) activity. No [14C]TCB metabolism was observed in the fish, despite elevated EROD activity in the trout. HPLC analysis of diisopropylether extracts of the microsomal incubations indicated the presence of 4-OH-, 5-OH-, and 6-OH-tetrachlorobiphenyl metabolites and a yet unidentified metabolite. The ratio of the different hydroxy metabolites formed varied for the various species.
Collapse