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Types of Toxins01:36

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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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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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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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Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial...
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Is chemosensitisation by environmental pollutants ecotoxicologically relevant?

Denise Kurth1, Werner Brack1, Till Luckenbach2

  • 1UFZ-Helmholtz Centre for Environmental Research, Department of Effect-Directed Analysis, Permoserstr. 15, 04318 Leipzig, Germany; RWTH Aachen University, Department of Ecosystem Analyses, Institute for Environmental Research, Worringerweg 1, 52074, Aachen, Germany.

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Summary

Blocking cellular efflux (chemosensitisation) can increase organism sensitivity to environmental pollutants. Further research is needed to understand the full impact of chemosensitisation on aquatic ecosystems.

Keywords:
ABC efflux transporter inhibitionBioaccumulationBioavailabilityChemosensitisationMultixenobiotic resistance (MXR) reversalP-glycoprotein

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Area of Science:

  • Environmental Toxicology
  • Cellular Biology
  • Ecotoxicology

Background:

  • Cellular efflux of toxicants is a fundamental biological defense mechanism across all organisms.
  • Multixenobiotic resistance transport, or chemosensitisation, plays a key role in cellular defense.
  • Compounds like pesticides, pharmaceuticals, fragrances, and surfactants are known chemosensitisers.

Purpose of the Study:

  • To critically evaluate existing data on the environmental impact of chemosensitisation on an organismal level.
  • To identify research gaps and needs concerning the effects of chemosensitisation on aquatic organisms.
  • To assess whether chemosensitisation enhances the risks of chemical exposure in aquatic environments.

Main Methods:

  • Review and critical evaluation of existing scientific literature on chemosensitisation and its effects on aquatic wildlife.
  • Analysis of studies investigating individual chemicals and complex environmental mixtures.
  • Examination of a chemosensitiser mixture toxicity model, acknowledging its inherent uncertainties.

Main Results:

  • Chemosensitisation, while significant at the cellular level, has an poorly understood impact on the organismal and ecosystem levels.
  • Existing data suggests chemosensitisation may increase the risks of chemical exposure for aquatic organisms.
  • Substantial knowledge gaps, including inconsistent data reporting and lack of representative contaminants, create uncertainty.

Conclusions:

  • Chemosensitisation has the potential to significantly enhance the risks associated with chemical exposure for aquatic organisms.
  • There is a critical need for systematic investigation using a broader range of chemicals and environmental samples.
  • Harmonized bioassays and rigorously controlled exposure concentrations are required to confirm the tentative conclusions.