title: Antioxidant activity of mangostin in cell-free system and its effect on K562 leukemia cell line in photodynamic therapy.
abstract: Mangostin (MAG), a kind of xanthone widely used in diet and medicine, has antioxidant, anti-inflammatory, antimicrobial, and anticancer activities. On account of its antioxidant activity, MAG might protect cancer cells from free radical damage in photodynamic therapy (PDT) during which reactive oxygen species production was stimulated leading to irreversible tumor cell injury. In this study, the antioxidant activity of MAG was investigated and the influence of MAG on K562 cells in 5-aminolevulinic acid (ALA)-based PDT is demonstrated. The results showed that MAG could scavenge hydroxyl radical, superoxide anion, and hydrogen peroxide and inhibit the formation of malondialdehyde (MDA), but increase the amounts of singlet oxygen in cell-free systems. MAG inhibits cell proliferation and enhances cell apoptosis, lipid peroxidation, and DNA damage in ALA-PDT on K562 cells. NaN3, a singlet oxygen quencher, suppresses the MAG-induced cell apoptosis, lipid peroxidation, and DNA damage. In conclusion, MAG enhances the PDT-induced cytotoxicity in K562 cells and singlet oxygen was involved in this process. These results implied that the effect of antioxidants on PDT might be determined by its sensitization ability to singlet oxygen.
authors.affiliation: Institute of Photonics and Phototechnology, Northwest University, Xi'an 710069, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Sun
authors.forename: Sujuan
authors.initials: S
authors.lastname: Zhang
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Wei
authors.forename: Lingfang
authors.initials: L
authors.lastname: Yin
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects; D002474:Cell-Free System; D004249:DNA Damage; D006801:Humans; D020014:K562 Cells; D007938:Leukemia / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology*; D015227:Lipid Peroxidation / Q000187:drug effects / Q000502:physiology; D010778:Photochemotherapy; D017382:Reactive Oxygen Species / Q000378:metabolism; D019810:Sodium Azide / Q000494:pharmacology; D044004:Xanthones / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D017382:Reactive Oxygen Species; D044004:Xanthones; D019810:Sodium Azide; C021053:mangostin