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Related Concept Videos

Toxicokinetics: Overview01:21

Toxicokinetics: Overview

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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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Toxicity Testing in Animals01:23

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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.
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Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
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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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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Metabonomics and toxicology.

Liang Zhao1, Thomas Hartung

  • 1Center for Alternatives to Animal Testing, Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, 615 N. Wolfe Street, Baltimore, MD, 21205, USA.

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Metabonomics, an "omics" research field, enhances toxicological studies by revealing toxicity mechanisms. This technology identifies metabolic signatures predictive of adverse health effects from chemical exposure.

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Area of Science:

  • Metabolomics
  • Toxicology
  • Systems Biology
  • Bioinformatics

Background:

  • Metabonomics is an emerging interdisciplinary field combining analytical chemistry, bioinformatics, statistics, and biochemistry.
  • It integrates patho-biochemistry, systems biology, and molecular diagnostics for toxicological applications.
  • Metabonomics provides detailed insights into the mechanisms of toxicity.

Purpose of the Study:

  • To summarize the current state of metabonomics technology.
  • To highlight its applications in toxicological studies.
  • To emphasize its role in identifying toxicity signatures.

Main Methods:

  • Monitoring metabolic changes over time and dose after chemical treatment.
  • Utilizing analytical chemistry and bioinformatics techniques.
  • Applying statistical and biochemical analyses.

Main Results:

  • Metabonomics offers detailed information for elucidating toxicity mechanisms.
  • It enables the monitoring of metabolic alterations induced by chemical exposure.
  • The technology facilitates the identification of toxicity signatures.

Conclusions:

  • Metabonomics is a valuable tool in toxicology for understanding chemical-induced effects.
  • Identifying metabolic patterns can predict potential hazards.
  • This field holds significant promise for advancing toxicological research.