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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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Biological Effects of Radiation02:59

Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

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Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
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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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Overview
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Immunofluorescence Imaging of DNA Damage and Repair Foci in Human Colon Cancer Cells
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Exploring the link between ceramide and ionizing radiation.

Massimo Aureli1, Valentina Murdica, Nicoletta Loberto

  • 1Department of Medical Biotechnology and Translational Medicine, University of Milano, Via Fratelli Cervi 93, 20090, Segrate, Italy.

Glycoconjugate Journal
|August 18, 2014
PubMed
Summary
This summary is machine-generated.

Radiotherapy uses ionizing radiation to kill cancer cells. Ceramide accumulation, a lipid molecule, is directly linked to radiation-induced cell death, primarily apoptosis, offering new therapeutic targets.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Radiotherapy eradicates cancer cells using ionizing radiation.
  • Cellular response to radiation involves DNA damage and signaling pathways.
  • Ceramide is a key lipid mediator in cell death and differentiation pathways.

Purpose of the Study:

  • To elucidate ceramide's role in radiation-induced cell death.
  • To define metabolic pathways of ceramide formation and dysregulation in radiotherapy.
  • To explore sphingolipid metabolism's interplay with radiation therapy.

Main Methods:

  • Review of current knowledge on ceramide accumulation routes.
  • Analysis of enzymes in ceramide neogenesis and catabolism.
  • Discussion of sphingolipid breakdown and glycosphingolipid glycohydrolases.

Main Results:

  • Ceramide accumulation is strongly linked to radiation-induced cell death, mainly apoptosis.
  • Sphingolipid breakdown is a significant mechanism for ceramide generation post-irradiation.
  • Glycosphingolipid glycohydrolases are identified as direct targets of ionizing radiation.

Conclusions:

  • Understanding ceramide metabolism is crucial for optimizing radiotherapy.
  • Targeting sphingolipid pathways may enhance cancer cell death induced by radiation.
  • Further investigation into ceramide signaling can refine radiation therapy strategies.