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Toxicity Testing in Animals01:23

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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Studies that assess how a drug is absorbed, distributed, metabolized, and excreted (ADME) at toxic doses are termed toxicokinetics. Understanding toxicokinetics helps predict adverse drug reactions (ADRs) and manage toxicity in humans.Toxicokinetics differs from pharmacokinetics mainly in the dose levels studied, with toxicokinetics focusing on higher toxic doses. The kinetics at these levels can be non-linear due to altered physiological processes. Toxicodynamics examines the relationship...
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Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
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Toward a new toxicology - evolution or revolution?

Thomas Hartung1

  • 1Traceability, Risk and Vulnerability Assessment Unit, Institute for Protection and Security of the Citizen, European Commission Joint Research Centre, Ispra, Italy. thomas.hartung@ec.europa.eu

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Summary

Regulatory toxicology is undergoing a significant paradigm shift, driven by new factors and facing specific obstacles. This essay analyzes these revolutionary changes using Thomas Kuhn

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Area of Science:

  • Toxicology
  • Regulatory Science
  • Scientific Philosophy

Background:

  • The field of toxicology is experiencing a fundamental transformation, moving away from traditional approaches.
  • This shift is analyzed through the lens of Thomas Kuhn's theories on scientific revolutions, specifically 'The Structure of Scientific Revolutions'.

Discussion:

  • Examines the key driving forces and underlying mechanisms propelling the paradigm change in toxicology.
  • Identifies and discusses the significant obstacles hindering the progress of these emerging toxicological frameworks.
  • Applies Kuhn's assumptions to contextualize current developments within the broader history of scientific advancement.

Key Insights:

  • Evidence suggests a revolutionary change is actively occurring within regulatory toxicology.
  • The transition involves a re-evaluation of established principles and methodologies.

Outlook:

  • The ongoing paradigm shift in toxicology necessitates adaptation and innovation in regulatory practices.
  • Future toxicological assessments will likely be shaped by these revolutionary changes.