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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.
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Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
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Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
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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 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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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...
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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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A Strategy to Identify Compounds that Affect Cell Growth and Survival in Cultured Mammalian Cells at Low-to-Moderate Throughput
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Current concepts in cell toxicity.

A Samali1, B Zhivotovsky, S Orrenius

  • 1Karolinska Institutet, Stockholm, Sweden.

Current Protocols in Toxicology
|October 10, 2012
PubMed
Summary
This summary is machine-generated.

This overview defines cellular death and explores its mechanisms, apoptosis and necrosis. It details structural changes, macromolecular degradation, and the roles of signaling, mitochondria, and genetics in these cell death pathways.

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Real-Time Impedance-based Cell Analyzer as a Tool to Delineate Molecular Pathways Involved in Neurotoxicity and Neuroprotection in a Neuronal Cell Line
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Real-Time Impedance-based Cell Analyzer as a Tool to Delineate Molecular Pathways Involved in Neurotoxicity and Neuroprotection in a Neuronal Cell Line

Published on: August 9, 2014

Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Cell death is a fundamental biological process.
  • Understanding cell death mechanisms is crucial for various fields, including medicine and developmental biology.

Purpose of the Study:

  • To provide a basic definition of cellular death.
  • To elucidate the mechanisms of apoptosis and necrosis.
  • To describe the associated structural and molecular changes.

Main Methods:

  • Literature review and synthesis of existing research.
  • Comparative analysis of apoptosis and necrosis.
  • Description of key molecular and genetic factors.

Main Results:

  • Cellular death encompasses distinct processes like apoptosis and necrosis.
  • Apoptosis involves programmed cell dismantling, while necrosis is typically uncontrolled cell death.
  • Both pathways involve specific structural alterations and macromolecular degradation.

Conclusions:

  • Cellular death is regulated by complex signaling pathways.
  • Mitochondria play a critical role in initiating and executing cell death.
  • Genetic factors significantly influence the progression of apoptosis and necrosis.