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Related Concept Videos

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...
Toxicokinetics: Overview01:21

Toxicokinetics: Overview

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...
Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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,...
Mutagenicity and Carcinogenicity01:25

Mutagenicity and Carcinogenicity

Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

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...
Drug Toxicity: Overview01:00

Drug Toxicity: Overview

Drug toxicity quantifies the harm a compound causes to an organism, varying by dose and potentially impacting whole systems or specific organs like the liver. Toxic reactions may arise from venomous insect or spider bites, with effects ranging from mild symptoms to severe outcomes such as brain damage or death. Common forms of acute poisoning include ethanol intoxication and overdose of pain or fever medications, with substances like GHB and heroin being particularly lethal at doses close to...

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Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation
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New directions in toxicity testing.

Daniel Krewski1, Margit Westphal, Mustafa Al-Zoughool

  • 1McLaughlin Center for Population Health Risk Assessment, University of Ottawa, Ontario, Canada. dkrewski@uottawa.ca

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Summary

The U.S. National Research Council (NRC) updated toxicity testing strategies by integrating modern tools to identify adverse health effects from environmental agents. This approach enhances risk assessment for public health protection.

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Area of Science:

  • Environmental toxicology
  • Toxicological sciences
  • Risk assessment

Background:

  • The 2007 National Research Council (NRC) report, "Toxicity Testing in the 21st Century: A Vision and a Strategy," aimed to modernize toxicity testing.
  • The report emphasized identifying critical perturbations in toxicity pathways linked to adverse human health outcomes.
  • This established a need for advanced methods in environmental health risk assessment.

Purpose of the Study:

  • To review emerging scientific methods that advance the NRC's vision for toxicity testing.
  • To illustrate how new approaches improve the assessment of health risks from environmental agents.
  • To discuss the integration of these advancements into the established risk assessment framework.

Main Methods:

  • Review of emerging scientific methods and technologies in toxicology.
  • Application of the four-stage risk assessment framework.
  • Detailed examination of the Nrf2 antioxidant pathway as a case study.

Main Results:

  • Emerging methods align with the NRC's vision, enabling better identification of toxicity pathway perturbations.
  • The Nrf2 antioxidant pathway serves as a model for identifying key molecular disruptions.
  • The new paradigm is compatible with existing regulatory risk assessment processes.

Conclusions:

  • Modern scientific tools and strategies significantly enhance toxicity testing.
  • The integration of pathway-based approaches improves the accuracy of health risk assessments.
  • This strategic shift supports more effective regulatory decision-making for environmental agents.