Lee JH, Eom KS, Song DK, Suh SI, Kim DK. In vitro and in vivo effects of melatonin on sister chromatid exchange in human blood lymphocytes exposed to hypoxia.
Drug Chem Toxicol 2015;
39:153-6. [PMID:
26114412 DOI:
10.3109/01480545.2015.1058393]
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Abstract
OBJECTIVE
Many studies have shown that melatonin (MLT) has an anti-genotoxic effect in various tissues and cell lines. The aim of this study was to investigate the anti-genotoxic effect of MLT on normal human peripheral lymphocytes by assessing sister chromatid exchange (SCE) in vitro and in vivo.
MATERIALS AND METHODS
Cells were treated with 50 and 200 μM of MLT. The human volunteers (n = 20) for the in vivo study were administered a single dose of 3 mg MLT daily for 2 weeks. After sufficient time for its clearance, 1.5 mg of MLT daily was then administered to the same volunteers at same the period.
RESULTS
Our results demonstrated the anti-genotoxic effect of MLT in human blood lymphocyte in vitro and in vivo. In vitro, hypoxia increased the SCE frequency compared to the control and both doses of MLT significantly decreased the SCE frequency in the hypoxic cells (p < 0.001). In vivo, oral administration of 3 mg MLT significantly increased the frequency of SCE, yet a small increase of SCE by hypoxia was found. Oral administration of 1.5 mg MLT showed no DNA damage but it had an anti-genotoxic effect.
DISCUSSION AND CONCLUSION
MLT may prove useful for reducing the genotoxic effects of hypoxia in peripheral lymphocytes and suggest its possible role for ischemic diseases.
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