Related Experiment Video
Updated: Jun 3, 2026
04:53
Zebrafish Larvae as a Model to Evaluate Potential Radiosensitizers or Protectors
Published on: August 25, 2022
Salen Mn complexes mitigate radiation injury in normal tissues
Rosalind A Rosenthal1, Brian Fish, Richard P Hill
1Pulmonary Center, Department of Medicine, Boston University School of Medicine, MA, USA.
Anti-Cancer Agents in Medicinal Chemistry
|April 2, 2011
Summary
Synthetic manganese (Mn) salen complexes, like EUK-189 and EUK-207, show promise in mitigating radiation injury. These antioxidant compounds protect normal tissues from oxidative stress, suggesting potential therapeutic applications.
Area of Science:
- Biochemistry
- Radiology
- Pharmacology
Background:
- Oxidative stress is a key factor in delayed radiation injury.
- Synthetic manganese (Mn) salen complexes (e.g., EUK-134, EUK-189, EUK-207) are potent superoxide dismutase (SOD) and catalase mimetics.
- These compounds demonstrate efficacy in various oxidative stress models.
Purpose of the Study:
- To investigate the potential of Mn salen complexes in mitigating normal tissue injury from ionizing radiation.
- To review research on the protective effects of these compounds on kidney, lung, skin, and oral mucosa.
Main Methods:
- Review of preclinical studies involving Mn salen complexes (EUK-189, EUK-207) in animal models of radiation injury.
- Assessment of oxidative stress markers in affected tissues.
- Evaluation of mitochondrial protective effects in cellular models.
Main Results:
- EUK-189 and EUK-207 demonstrated suppression of delayed radiation injury in multiple tissues.
- Oxidative stress indicators were reduced in lung and skin injury models.
- Mn salen complexes exhibited mito-protective properties, attenuating mitochondrial damage.
Conclusions:
- Mn salen complexes show potential for mitigating delayed radiation injury to normal tissues.
- Further research is needed to optimize delivery, pharmaceutical properties, and elucidate mechanisms of action.
Related Concept Videos
02:59Biological Effects of Radiation
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 produce ions...
01:35Mutations
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...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
01:46Electron Transport Chain: Complex I and II
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...
ROS generation is regulated and maintained at moderate levels necessary...
01:20Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
01:18Other Unique Bacteria
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 and are commonly found near the...
01:38Nucleotide Excision Repair
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...
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...