title: Lycopene: An antioxidant and radioprotector against gamma-radiation-induced cellular damages in cultured human lymphocytes.
abstract: The present study aimed to evaluate the radioprotective effect of lycopene, a naturally occurring dietary carotenoid on gamma-radiation-induced toxicity. The cellular changes were estimated by using lipid peroxidative indices like thiobarbituric acid reactive substances (TBARS), hydroperoxides (HP), the antioxidants superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and reduced glutathione (GSH). The DNA damage was analyzed by cytokinesis blocked micronucleus assay (CBMN), dicentric aberration (DC) and translocation frequency. The gamma-radiation at different doses (1, 2 and 4Gy) resulted in a significant increase in the number of micronuclei (MN), DC, translocation frequency, TBARS and HP level, whereas the levels of GSH and antioxidant enzymes were significantly decreased when compared with normal control. The maximum damage to lymphocytes was observed at 4Gy irradiation. Lycopene pretreatment (1, 5 and 10microg/ml) significantly decreased the frequency of MN, DC and translocation when compared with gamma-radiation control. The levels of TBARS, HP were also decreased and activities of SOD, CAT and GPx were significantly increased along with GSH levels when compared with gamma-radiation control. The dose of 5microg/ml of lycopene was found to be more effective than the other two doses. Thus, our result shows that pretreatment with lycopene offers protection to normal lymphocytes against gamma-radiation-induced cellular damage.
authors.affiliation: Department of Biochemistry & Biotechnology, Annamalai University, Tamil Nadu, India.
authors.forename: M
authors.initials: M
authors.lastname: Srinivasan
authors.forename: N
authors.initials: N
authors.lastname: Devipriya
authors.forename: K B
authors.initials: KB
authors.lastname: Kalpana
authors.forename: Venugopal P
authors.initials: VP
authors.lastname: Menon
mesh_terms: D000328:Adult; D000975:Antioxidants / Q000008:administration & dosage / Q000494:pharmacology*; D002338:Carotenoids / Q000008:administration & dosage / Q000494:pharmacology*; D002374:Catalase / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured; D002869:Chromosome Aberrations / Q000187:drug effects / Q000528:radiation effects; D004249:DNA Damage / Q000187:drug effects / Q000528:radiation effects; D004305:Dose-Response Relationship, Drug; D005720:Gamma Rays; D005979:Glutathione Peroxidase / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D015227:Lipid Peroxidation / Q000187:drug effects / Q000528:radiation effects; D000077276:Lycopene; D008214:Lymphocytes / Q000187:drug effects* / Q000528:radiation effects; D048629:Micronuclei, Chromosome-Defective / Q000187:drug effects / Q000528:radiation effects; D011829:Radiation Dosage; D011837:Radiation-Protective Agents / Q000008:administration & dosage / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000187:drug effects / Q000528:radiation effects; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism; D055815:Young Adult
chemical_list: D000975:Antioxidants; D011837:Radiation-Protective Agents; D017392:Thiobarbituric Acid Reactive Substances; D002338:Carotenoids; D002374:Catalase; D005979:Glutathione Peroxidase; D013482:Superoxide Dismutase; D000077276:Lycopene