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Cellular targets in response to dioxin exposure

N Dell'Orto1, D Cantelli, C Urani

  • 1Dipartimento di Scienze dell'Ambiente e del Territorio, Università di Milano.

Chemosphere
|December 5, 1998
PubMed
Summary

This study shows that the amphibian Xenopus laevis is a sensitive bioindicator for 2,3,7,8-tetrachlorinated dibenzo-p-dioxin (TCDD). Even low TCDD doses caused developmental delays and altered biochemical levels in embryos.

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Area of Science:

  • Environmental Science
  • Toxicology
  • Developmental Biology

Background:

  • Dioxins, including 2,3,7,8-tetrachlorinated dibenzo-p-dioxin (TCDD), are widespread environmental contaminants.
  • TCDD is biologically reactive even at very low concentrations, posing risks to ecosystems.
  • Assessing TCDD's impact requires sensitive bioindicators to evaluate biological effects.

Purpose of the Study:

  • To utilize the amphibian Xenopus laevis as an innovative bioindicator for TCDD exposure.
  • To evaluate the biological effects of TCDD on embryonic development in Xenopus laevis.
  • To determine TCDD's toxicity thresholds and biochemical impact on the model organism.

Main Methods:

  • Exposure of Xenopus laevis embryos to varying concentrations of TCDD.
  • Analysis of embryonic developmental delays and teratogenic effects.
  • Measurement of biochemical markers such as P-450 induction and glutathione levels.

Main Results:

  • The LC50 value for TCDD in Xenopus laevis embryos was determined to be 342 ng/l.
  • Significant developmental delays were observed at TCDD concentrations up to 400 ng/l.
  • No significant teratogenic effects were detected within the tested concentration range.
  • Xenopus laevis demonstrated sensitivity to TCDD at low doses (0.1-0.5 ng/l), indicated by P-450 induction and altered glutathione levels.

Conclusions:

  • Xenopus laevis is a sensitive and effective bioindicator for detecting TCDD exposure and its biological effects.
  • TCDD exposure can cause significant developmental delays and biochemical alterations in amphibian embryos.
  • The study highlights the utility of Xenopus laevis in environmental monitoring for dioxin contamination.

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