Biotransformation of 2,4,6-trinitrotoluene (TNT) by Enchytraeids (Enchytraeus albidus) in vivo and in vitro

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DOIResolve DOI: http://doi.org/10.1016/j.envpol.2004.02.018
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TypeArticle
Journal titleEnvironmental Pollution
Volume131
Issue2
Pages263273; # of pages: 11
Subjectenv
Abstract2,4,6-Trinitrotoluene (TNT) is toxic to soil invertebrates, but little is known about its toxicokinetic behavior in soil. Tissue residue analysis was used to evaluate whether the presence of TNT and its reduced metabolites in soil invertebrates was due to uptake of these compounds from the soil into the organism, or due to microbial transformation of TNT associated with the organism followed by uptake. Adult white potworms (Enchytraeus albidus) were exposed to non-lethal concentrations of TNT in amended artificial soil for 21 d, or to TNT in solution for 20 h. Soil exposure studies confirmed earlier reports that TNT was transformed in enchytraeids in vivo to 2- and 4-aminodinitrotoluenes. However, enchytraeid exposure to TNT in solution led to the additional presence of 2,4-diaminonitrotoluene as well as 2- and 4- hydroxyamino-dinitrotoluenes and azoxy-compounds, suggesting that TNT can be metabolized in vivo in the absence of soil. Incubation of unexposed enchytraeid homogenates with TNT led to a protein-dependent appearance of these metabolites in vitro after gtoreq 16 h incubation. Cellular fractionation studies indicated that most of this activity resided in the 8000 x g pellet, and was completely inhibited by broad-spectrum antibiotics. These studies demonstrate that enchytraeids can transform TNT in vivo and in vitro, at least in part, by bacteria associated with the host organism. Crown Copyright Copyright 2004 Published by Elsevier Ltd. All rights reserved.
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AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
NRC number45955
NPARC number3540228
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Record identifier77942031-4640-4e58-a9dc-d5bc2ea74453
Record created2009-03-01
Record modified2016-05-09
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