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Related Experiment Video

Updated: Jun 6, 2026

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

Published on: December 25, 2016

Finding maximal transcriptome differences between reprotoxic and non-reprotoxic phthalate responses in rat testis.

Xiaolian Yuan¹, Martijs J Jonker, Jillian de Wilde

¹MicroArray Department and Integrative Bioinformatics Unit, Swammerdam Institute for Life Sciences, Faculty of Science, University of Amsterdam, Amsterdam, the Netherlands.

Journal of Applied Toxicology : JAT

|November 10, 2010

Summary

Related Concept Videos

Toxicity Testing in Animals

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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This study explored gene expression changes in rats exposed to phthalates to identify early toxicity markers. Toxicogenomics revealed distinct gene profiles for reprotoxic phthalates, aiding chemical risk assessment under REACH legislation.

Area of Science:

Toxicology
Genomics
Chemical Regulation

Background:

The EU's REACH regulation requires assessing 30,000 chemicals, often using animal testing for toxicity.
Reproductive toxicity testing is complex, time-consuming, and requires significant animal use.
Microarray technologies offer potential to refine in vivo toxicity testing and identify chemical-specific responses.

Purpose of the Study:

To investigate the use of gene-expression profiling to detect reproductive toxicity of phthalates.
To establish early warning biomarkers for chemical hazard assessment.
To explore a toxicogenomic category approach for prioritizing chemical testing.

Main Methods:

Male rats were administered single doses of reprotoxic or non-reprotoxic phthalates.

Related Experiment Videos

Last Updated: Jun 6, 2026

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

Published on: December 25, 2016

Histopathological analysis was performed 24 hours post-administration.

Gene-expression profiling was conducted to identify differential gene expression patterns.

Main Results:

Distinct gene-expression profiles were identified between rats exposed to reprotoxic and non-reprotoxic phthalates.
Gene expression differences were detectable earlier and at lower doses than traditional pathology.
Ambiguous histopathological findings contrasted with clear gene-expression signatures.

Conclusions:

Gene-expression signatures can serve as early indicators of phthalate reproductive toxicity.
Toxicogenomics provides a promising approach for refining chemical safety assessments and prioritizing testing under REACH.
This method could lead to more cost-effective and timely hazard assessments for a large number of chemicals.