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Toxicity Testing in Animals

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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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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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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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Drug Toxicity: Dose-Dependent Reactions01:24

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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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Antidotes are medicinal substances used to counteract the harmful effects of toxins or drugs in the body. They function in various ways, each uniquely designed to combat specific toxic compounds.
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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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Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
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Arsenic toxicity in humans: Research problems and prospects.

D J Thomas1

  • 1Pharmacokinetics Branch, Environmental Toxicology Division, Health Effects Research Laboratory, US Environmental Protection Agency, 27711, Research Triangle Park, North Carolina, USA.

Environmental Geochemistry and Health
|November 8, 2013
PubMed
Summary

Arsenic

Area of Science:

  • Environmental Science
  • Toxicology
  • Biochemistry

Background:

  • Arsenic's toxicity and how it moves in the body depend on its chemical form.
  • Methylation significantly alters arsenic's effects.

Purpose of the Study:

  • To understand the molecular processes of arsenic metabolism.
  • To characterize how individuals differ in their ability to methylate arsenic.

Main Methods:

  • Molecular biology techniques to study arsenic metabolism.
  • Biochemical assays to measure methylation capacity.

Main Results:

  • Identified key molecular pathways involved in arsenic biotransformation.
  • Demonstrated significant interindividual variability in arsenic methylation efficiency.

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Conclusions:

  • Understanding arsenic metabolism and methylation is crucial for assessing toxicity.
  • Individual differences in methylation capacity impact arsenic risk.