Assays of Dioxins and Dioxin-like Compounds in Actually Contaminated Soils Using Transgenic Tobacco Plants Carrying a Recombinant Mouse Aryl Hydrocarbon Receptor-mediated β-glucuronidase Reporter Gene Expression System

Overview

Journal J Environ Sci Health B

Specialties Environmental Health
Toxicology

Date 2012 Mar 21

PMID 22428884

Authors

Hideyuki Inui

Keiko Gion

Yasushi Utani

Taketo Wakai

Susumu Kodama

Heesoo Eun

Yun-Seok Kim

Hideo Ohkawa

Affiliations

Soon will be listed here.

Abstract

The transgenic tobacco plant XD4V-26 carrying the recombinant mouse aryl hydrocarbon receptor XD4V-mediated β-glucuronidase (GUS) reporter gene expression system was used for assay of dioxins and dioxin-like compounds consisting of polychlorodibenzo-p-dioxins, polychlorinated dibenzofurans, and coplanar polychlorinated biphenyls (Co-PCBs) in actually contaminated soils. The transgenic tobacco plant XD4V-26 showed a significant dose-dependent induced GUS activity when cultured on MS medium containing PCB126 [toxic equivalency factor (TEF) = 0.1]. In contrast, PCB169 and PCB180, which have 0.03 of TEF and unassigned TEF values, respectively, did not significantly induce GUS activity under the same conditions as with PCB126. When the tobacco plants were cultivated for up to 5 weeks on actually contaminated soils with dioxins and dioxin-like compounds collected from the periphery of an incinerator used for disposal of life and industrial wastes, GUS activity in the leaves was dose-dependently increased. The plants clearly detected 360 pg-TEQ g(-1) of dioxins and dioxin-like compounds in this assay. There was a positive correlation between GUS activity and TEQ value of dioxins and dioxin-like compounds in the plants. This assay does not require any extraction and purification processes for the actually contaminated soil samples.

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