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Related Concept Videos

Toxicity Testing in Animals01:23

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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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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Drug Distribution: Tissue Binding01:21

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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
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Drug effects on dieldrin storage in rat tissue.

J C Street1, M Wang, A D Blau

  • 1Animal Science Department, Utah State University, USA.

Bulletin of Environmental Contamination and Toxicology
|November 7, 2013
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Summary
This summary is machine-generated.

Certain drugs effectively reduce dieldrin accumulation in rat tissues. Heptabarbital showed the most significant reduction, offering potential for treating insecticide overexposure in humans and animals.

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Area of Science:

  • Toxicology
  • Pharmacology
  • Environmental Health

Background:

  • Organochlorine pesticides like dieldrin can accumulate in adipose tissue.
  • Insecticide accumulation poses risks to animal and human health.
  • Effective methods for reducing pesticide body burden are needed.

Purpose of the Study:

  • To evaluate the efficacy of selected drugs in reducing dieldrin retention in rats.
  • To compare the effectiveness of different drug administration routes (feed additive vs. intraperitoneal injection).
  • To explore potential therapeutic strategies for insecticide overexposure.

Main Methods:

  • Female rats were fed diets containing 1 ppm dieldrin.
  • Drugs including heptabarbital, aminopyrine, tolbutamide, and phenylbutazone were administered.
  • Tissue dieldrin levels were quantified using electron capture gas chromatography after 10 days.

Main Results:

  • Heptabarbital, aminopyrine, tolbutamide, and phenylbutazone significantly reduced tissue dieldrin levels when administered as feed additives.
  • Heptabarbital was the most potent, achieving an 80% reduction in dieldrin concentration.
  • Drug efficacy was compared to DDT, with observed differences in action duration.

Conclusions:

  • Selected pharmaceutical agents can effectively decrease insecticide accumulation in animal tissues.
  • These findings suggest potential applications for drug-based treatments in managing insecticide exposure.
  • Further research may lead to novel therapies for individuals with significant insecticide body burdens.