title: [Mechanism of apoptosis induced by indole-3-acetic acids combined with horseradish peroxidase in leukemia cell line K562].
abstract: To investigate the possible mechanism of apoptosis induced by indole-3-acetic acid (IAA) combined with horseradish peroxidase in leukemia cell line K562, cell proliferation and apoptosis of K562 cell were examined by MTT assay and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL), respectively; the activity of superoxide dismutase (SOD) and the quantitative change of MDA were measured by biochemical method; changes of free radical were determined by 2, 7-dichlorofluorescin diacetate (DCFH-DA) probe with confocal microscopy. The results showed that of MTT assay and TUNEL indicated that IAA/HRP could significantly inhibit cell proliferation (P < 0.05) and induce apoptosis of K562 cell (P < 0.01), at the same time a positive correlation was found between apoptosis rate and IAA concentration (r = 0.971, P < 0.01). The activity of SOD and the quantitative of MDA increased, accompanied with a rise in IAA concentration. Results detected by DCFH-DA probe indicated that the fluorescence intensity of intracellular free radical increased, as compared with control, and a positive correlation was found. It is concluded that IAA/HRP can inhibit proliferation of K562 cells and induce K562 cell apoptosis, its mechanism may be related with the increase of intracellular free radical due to the effects of IAA/HRP.
authors.affiliation: Department of Biology and Medical Genetics, Medical College of Xi'an Jiaotong University, Xi'an 710061, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Yang
authors.forename: Tu-Sheng
authors.initials: TS
authors.lastname: Song
authors.forename: Chen
authors.initials: C
authors.lastname: Huang
authors.forename: Li-Ying
authors.initials: LY
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Luo
authors.forename: Lei
authors.initials: L
authors.lastname: Ni
authors.forename: Lü-Sheng
authors.initials: LS
authors.lastname: Si
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004357:Drug Synergism; D006735:Horseradish Peroxidase / Q000494:pharmacology*; D006801:Humans; D020287:In Situ Nick-End Labeling; D007210:Indoleacetic Acids / Q000494:pharmacology*; D020014:K562 Cells; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000378:metabolism / Q000473:pathology; D018613:Microscopy, Confocal; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism; D013997:Time Factors
chemical_list: D007210:Indoleacetic Acids; D017382:Reactive Oxygen Species; C030737:indoleacetic acid; D006735:Horseradish Peroxidase; D013482:Superoxide Dismutase