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Melatonin: possible mechanisms involved in its 'radioprotective' effect
Vijayalaxmi1, R J Reiter, M L Meltz
1Department of Radiology/Division of Radiation Oncology, and Center for Environmental Radiation Toxicology, The University of Texas Health Science Center, 7703 Floyd Curl Drive, San Antonio, TX 78284, USA. vijay@uthscsa.edu
Mutation Research
|September 5, 1998
Summary
Melatonin supplementation significantly reduced DNA damage and chromosomal aberrations in human lymphocytes exposed to gamma radiation. This suggests melatonin offers radioprotective effects against genetic damage.
Area of Science:
- Radioprotection
- Genetics
- Pharmacology
Background:
- Melatonin is a hormone with known antioxidant properties.
- Assessing its protective effects against ionizing radiation is crucial.
Purpose of the Study:
- To investigate the radioprotective potential of melatonin in human lymphocytes.
- To quantify the reduction in genetic damage after melatonin ingestion.
Main Methods:
- Peripheral blood samples from four volunteers were collected before and after oral melatonin administration.
- Whole blood aliquots were exposed to gamma radiation in vitro.
- Primary DNA damage, chromosomal aberrations, and micronuclei were analyzed.
Main Results:
- Melatonin ingestion led to a significant decrease in primary DNA damage.
- Frequencies of chromosomal aberrations and micronuclei were also reduced post-melatonin.
- The reduction in primary DNA damage was less pronounced than in chromosomal damage.
Conclusions:
- Melatonin exhibits radioprotective properties against gamma radiation-induced genetic damage in human lymphocytes.
- The findings support melatonin's potential role in mitigating radiation-induced cellular injury.
- Further research into the mechanisms of melatonin's radioprotection is warranted.