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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

175
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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Toxic Reactions: Overview01:26

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
In contrast, systemic toxicity requires the toxic agent's absorption and distribution,...
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Related Experiment Video

Updated: Apr 19, 2026

Abbiategrasso Brain Bank Protocol for Collecting, Processing and Characterizing Aging Brains
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Brain tissue: a viable postmortem toxicological specimen.

Timothy P Rohrig1, Charity A Hicks2

  • 1Regional Forensic Science Center, 1109 N Minneapolis, Wichita, KS 67214, USA trohrig@sedgwick.gov.

Journal of Analytical Toxicology
|December 16, 2014
PubMed
Summary
This summary is machine-generated.

Brain tissue analysis offers a reliable method for postmortem toxicology interpretation, overcoming challenges associated with blood specimens. This study confirms a positive correlation between blood and brain drug concentrations, aiding forensic analysis.

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Area of Science:

  • Forensic Toxicology
  • Neuroscience
  • Analytical Chemistry

Background:

  • Postmortem toxicology interpretation faces challenges with blood specimens due to factors like redistribution.
  • The brain's protected location may offer a more stable environment for drug concentration analysis.
  • Limited research exists on the direct correlation between postmortem blood and brain tissue drug concentrations.

Purpose of the Study:

  • To compare drug concentrations in postmortem brain tissue with those in heart and femoral blood.
  • To evaluate the utility of brain tissue as a reliable specimen in postmortem toxicology.
  • To establish the correlation between blood-to-brain drug concentrations for improved interpretation.

Main Methods:

  • Analysis of 30 drugs and drug metabolites in postmortem specimens.
  • Comparison of drug concentrations in brain tissue versus heart and femoral blood.
  • Data collected from cases at the Sedgwick County Regional Forensic Science Center (2007-2014).

Main Results:

  • A positive correlation was observed between drug concentrations in blood (heart and femoral) and brain tissue.
  • This correlation suggests brain tissue drug levels can be reliably predicted from blood levels.
  • The findings support the use of brain tissue as a valuable tool in forensic toxicology.

Conclusions:

  • Brain tissue analysis provides a valuable, reliable adjunct to postmortem toxicology.
  • The established blood-to-brain concentration correlation enhances the interpretation of drug effects in postmortem investigations.
  • This study offers a new tool for toxicologists and pathologists in forensic case analysis.