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Related Experiment Video

Updated: Apr 28, 2026

Prevention of Heat Stress Adverse Effects in Rats by Bacillus subtilis Strain

Prevention of Heat Stress Adverse Effects in Rats by Bacillus subtilis Strain

Published on: July 11, 2016

Thermal stress and toxicity.

Christopher J Gordon¹, Andrew F M Johnstone, Cenk Aydin

¹Toxicity Assessment Division, National Health Effects and Environmental Research Laboratory, U.S. Environmental Protection Agency, North Carolina.

Comprehensive Physiology

|June 20, 2014

Summary

This summary is machine-generated.

Ambient temperature significantly impacts toxicant exposure. While rodents cool down to manage toxins, heat stress worsens toxicity in both rodents and humans, complicating safety testing and risk assessment.

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Measurements of Physiological Stress Responses in C. Elegans

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Published on: May 21, 2020

Area of Science:

Environmental toxicology
Physiology
Comparative toxicology

Background:

Standard toxicity testing uses rodents at sub-thermoneutral temperatures (~22°C).
Rodents exhibit hypothermia in response to toxicants, affecting toxicant clearance and survival.
Interspecies differences in thermoregulation complicate translating rodent toxicity data to humans.

Purpose of the Study:

To investigate the influence of ambient temperature on toxicant toxicity and clearance.
To explore the role of thermoregulation in rodent and human responses to chemical toxicants.
To highlight challenges in extrapolating rodent toxicity data to human risk assessment.

Main Methods:

Review of existing literature on thermoregulation and toxicant exposure.
Analysis of rodent and human physiological responses to varying ambient temperatures and toxicants.
Examination of epidemiological data on environmental pollutants and thermal stress.

Main Results:

Elevated ambient temperatures exacerbate toxicant toxicity.
Rodent hypothermia delays toxicant clearance but can improve survival.
Heat stress worsens toxicity in humans via mechanisms like accelerated insecticide uptake and pollutant effects.

Conclusions:

Ambient temperature is a critical factor in toxicant toxicity and safety testing.
Rodent hypothermic responses differ significantly from human thermoregulation under toxicant exposure.
Accurate human risk assessment requires considering species-specific thermoregulatory differences and thermal stress.