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Related Concept Videos

Mutations01:35

Mutations

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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.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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DNA Damage can Stall the Cell Cycle02:36

DNA Damage can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

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DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
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Nucleotide Excision Repair01:08

Nucleotide Excision Repair

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Other Unique Bacteria01:18

Other Unique Bacteria

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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Related Experiment Video

Updated: Mar 29, 2026

Measuring DNA Damage and Repair in Mouse Splenocytes After Chronic In Vivo Exposure to Very Low Doses of Beta- and Gamma-Radiation
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Tempol Exerts Radioprotective Effects by Suppressing Radiation-Induced DNA Double-Strand Break Formation.

Shinya Masugata1, Megumi Sasatani2, Tsutomu Shimura3

  • 1Department of Biological Sciences, College of Science, Ibaraki University, Ibaraki 310-8512, Japan.

International Journal of Molecular Sciences
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

The antioxidant tempol (4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl) shows promise as a radioprotective agent. It effectively reduces radiation-induced DNA damage and inflammation, particularly during chronic exposure.

Keywords:
DNA double-strand break (DNA DSB)ROSantioxidantinflammationγ-H2AX

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Area of Science:

  • Biomedical Sciences
  • Radiation Biology
  • Pharmacology

Background:

  • Growing concerns exist regarding radiation exposure from nuclear accidents and medical procedures.
  • There is a critical need for agents that can mitigate radiation-induced health effects.
  • The antioxidant tempol (4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl) is a potential candidate for radioprotection.

Purpose of the Study:

  • To investigate the radioprotective mechanisms of tempol.
  • To evaluate tempol's efficacy in reducing radiation-induced DNA damage and inflammation in cellular and animal models.

Main Methods:

  • Cellular studies involved irradiating HeLa and TIG-3 cells with X-rays, gamma-rays, or heavy-ion beams.
  • Reactive oxygen species (ROS) production was measured using FACS analysis.
  • DNA double-strand breaks (DSBs) were assessed via gamma-H2AX staining; in vivo studies in mice evaluated gamma-H2AX formation, inflammation markers, and apoptosis.

Main Results:

  • Tempol significantly suppressed ROS production and gamma-H2AX foci formation in irradiated cells.
  • In mice, tempol reduced gamma-H2AX induction in thymus and duodenum tissues.
  • Tempol showed a trend towards decreasing macrophage infiltration and TNF expression, indicating reduced inflammation, and was more effective against chronic irradiation damage.

Conclusions:

  • Tempol demonstrates significant radioprotective effects by mitigating DNA damage and inflammation.
  • Its ability to reduce reactive oxygen species and DNA double-strand breaks supports its potential as a therapeutic agent against radiation injury.
  • Tempol's efficacy, especially under chronic exposure conditions, warrants further investigation for clinical applications.