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Temperature determines toxicity: bisphenol A reduces thermal tolerance in fish
Alexander G Little1, Frank Seebacher1
1School of Biological Sciences, University of Sydney, NSW, 2006, Australia.
Environmental Pollution (Barking, Essex : 1987)
|December 17, 2014
Summary
Environmental pollutant Bisphenol A (BPA) impairs zebrafish physiology, with effects varying by temperature. This suggests BPA toxicity interacts with climate change, requiring dynamic toxicological assessments.
Area of Science:
- Environmental toxicology
- Ecotoxicology
- Physiology
Background:
- Bisphenol A (BPA) is a widespread pollutant with debated toxic effects at environmental concentrations.
- BPA disrupts nuclear receptor pathways crucial for animal environmental responses.
- Thermal acclimation in fish is regulated by these pathways, suggesting temperature-dependent BPA toxicity.
Purpose of the Study:
- To investigate the temperature-specific toxicity of Bisphenol A (BPA) in zebrafish (Danio rerio).
- To determine if ecologically relevant BPA concentrations impact fish physiology and how this is modulated by ambient temperature.
Main Methods:
- Zebrafish were exposed to varying BPA concentrations at different acclimation and test temperatures.
- Physiological responses including swimming performance, heart rate, and SERCA activity were measured.
- Gene expression related to these physiological functions was analyzed.
Main Results:
- Ecologically relevant BPA concentrations (20 μg/l) significantly impaired swimming performance and heart rate.
- BPA affected muscle and cardiac SERCA activity and gene expression.
- Many observed BPA effects were temperature-specific and exhibited non-monotonic dose-responses.
Conclusions:
- BPA toxicity is temperature-dependent, impacting key physiological functions in zebrafish.
- BPA pollution may exacerbate climate change impacts on aquatic ecosystems.
- Current toxicological assessments may underestimate BPA's dynamic and temperature-modulated risks.
