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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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Accumulation and Distribution of Fluorescent Microplastics in the Early Life Stages of Zebrafish
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UVB-Aged Microplastics and Cellular Damage: An in Vitro Study.

Sebastiano La Maestra1, Mirko Benvenuti2, Stefano Alberti3

  • 1Department of Health Sciences, University of Genoa, Via A. Pastore, 1, 16132, Genoa, Italy. Sebastiano.lamaestra@unige.it.

Archives of Environmental Contamination and Toxicology
|June 19, 2024
PubMed
Summary
This summary is machine-generated.

UV-aged microplastics (MPs) and smaller sizes induced genotoxic damage and oxidative stress in human cells. This highlights potential health risks from environmental plastic pollution.

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Area of Science:

  • Environmental Science
  • Toxicology
  • Materials Science

Background:

  • Plastic waste is a global issue, fragmenting into microplastics (MPs) via various degradation processes.
  • Microplastics are pervasive environmental contaminants, posing risks through ingestion and inhalation by organisms, including humans.

Purpose of the Study:

  • To investigate the genotoxic and oxidative stress effects of virgin and UV-aged polystyrene microplastics (1 and 5 µm) on the THP-1 cell line.
  • To characterize microplastic particles after UVB exposure to understand aging effects.

Main Methods:

  • Fourier transform infrared spectroscopy and Zeta-potential measurements were used for microplastic characterization.
  • The THP-1 monocyte cell line was exposed to polystyrene microplastics to assess cellular damage.
  • Reactive oxidative species (ROS) generation and malondialdehyde levels were measured to evaluate oxidative stress.
  • Genotoxic damage was assessed to determine the impact of microplastic exposure.

Main Results:

  • UVB exposure altered microplastic characteristics.
  • Microplastic exposure led to increased reactive oxidative species (ROS) and malondialdehyde levels, indicating oxidative stress.
  • Genotoxic damage was observed, particularly with smaller and UV-aged microplastic particles.
  • Biochemical and genomic alterations were detected in exposed cells.

Conclusions:

  • UV-aged and smaller microplastics induce significant genotoxic damage and oxidative stress in vitro.
  • These findings suggest potential adverse health effects in populations exposed to degraded microplastics.
  • Further research is crucial to fully elucidate the health risks associated with microplastic pollution.