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Mutagenicity and Carcinogenicity01:25

Mutagenicity and Carcinogenicity

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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 and Tissue Toxicity01:25

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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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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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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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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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Advanced 3D Liver Models for In vitro Genotoxicity Testing Following Long-Term Nanomaterial Exposure
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Genotoxicity of titanium dioxide nanoparticles.

Tao Chen1, Jian Yan1, Yan Li1

  • 1Division of Genetic and Molecular Toxicology, National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA.

Journal of Food and Drug Analysis
|March 29, 2014
PubMed
Summary
This summary is machine-generated.

Titanium dioxide nanoparticles (TiO(2)-NPs) show inconsistent genotoxicity results across standard assays. While in vitro tests suggest DNA damage, in vivo studies are less conclusive, with mutagenicity largely negative, indicating oxidative stress as a key mechanism.

Keywords:
Ames testCarcinogenicityClass A geneCometGenotoxicityHypoxanthine-guanine phosphoribosyl transferase geneMicronucleusPhosphatidylinositol glycanSister chromatid exchangeTitanium dioxide nanoparticlesWing point mutation

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Area of Science:

  • Nanotechnology
  • Toxicology
  • Genetics

Background:

  • Titanium dioxide nanoparticles (TiO(2)-NPs) are widely used in pharmaceuticals and cosmetics.
  • Their small size confers unique properties but raises health and environmental concerns.
  • TiO(2)-NPs are linked to inflammation, lung damage, and potential carcinogenicity.

Purpose of the Study:

  • To review and analyze reported genotoxicity data for TiO(2)-NPs.
  • To focus on results from standard genotoxicity assays.
  • To identify patterns and mechanisms of TiO(2)-NP genotoxicity.

Main Methods:

  • Literature review of genotoxicity studies on TiO(2)-NPs.
  • Inclusion of data from standard assays: Ames test, Comet assay (in vitro/in vivo), micronucleus assay (in vitro/in vivo), sister chromatid exchange, HGPRT assay, WRSA, and Mpg assay.
  • Categorization of results based on assay type (in vitro vs. in vivo, DNA/chromosome damage vs. gene mutation).

Main Results:

  • Inconsistent genotoxicity results reported across various assays.
  • In vitro assays yielded more positive genotoxicity results than in vivo assays.
  • Tests for DNA and chromosome damage showed more positive results than gene mutation assays; mutagenicity tests were predominantly negative.
  • Oxidative stress identified as the primary mechanism for TiO(2)-NP genotoxicity.

Conclusions:

  • The genotoxicity of TiO(2)-NPs is complex and assay-dependent.
  • In vitro data suggest potential for DNA and chromosome damage, primarily via oxidative stress.
  • Further research is needed to reconcile in vitro and in vivo findings and fully understand risks.