title: Experiment and mechanism research of SKOV3 cancer cell apoptosis induced by nanosecond pulsed electric field.
abstract: This paper studies the apoptosis of human ovarian carcinoma cell Line (SKOV3) induced by the nanosecond pulsed electric field (10kV/cm, 100ns, 1 Hz) and its effect on intracellular calcium concentration ([Ca2+]i). These cells were doubly marked by Annexin V-FITC/PI, and the apoptosis rate was analyzed with flow cytometry. After AO/EB staining the morphological changes were observed under fluorescent microscope, and their ultrastructural changes were observed under scanning electron microscope (SEM). With Fluo-3/AM as calcium fluorescent marker, laser scanning confocal microscope (LSCM) was used to detect the effect of nsPEF on [Ca2+]i and the source of Ca2+. The results showed that the early apoptosis rate of the treatment group was (22.21+/-2.71)%, significantly higher than that of the control group (3.04+/-0.44)% (P<0.01). The typical features of apoptotic cell have been observed by fluorescent microscope and SEM. It is proved that nsPEF can induce apoptosis of SKOV3 cells and result in distinct increase in [Ca2+]i (P0.01), which was independent of extracellular calcium concentration (P>0.05). Since nsPEF can penetrate cell membrane due to its high frequency components, one of the mechanisms of nsPEF-induced apoptosis may be that activating intracellular calcium stores can increase the [Ca2+]i, and consequently, the apoptotic signal pathway can be induced.
authors.affiliation: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China. yaochenguo@cqu.edu.cn
authors.forename: Chenguo
authors.initials: C
authors.lastname: Yao
authors.forename: Yan
authors.initials: Y
authors.lastname: Mi
authors.forename: Xiaoqian
authors.initials: X
authors.lastname: Hu
authors.forename: Chengxiang
authors.initials: C
authors.lastname: Li
authors.forename: Caixin
authors.initials: C
authors.lastname: Sun
authors.forename: Junying
authors.initials: J
authors.lastname: Tang
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Wu
mesh_terms: D017209:Apoptosis / Q000528:radiation effects*; D045744:Cell Line, Tumor; D004307:Dose-Response Relationship, Radiation; D004558:Electric Stimulation / Q000379:methods*; D004574:Electromagnetic Fields; D005260:Female; D006801:Humans; D036103:Nanotechnology / Q000379:methods*; D010051:Ovarian Neoplasms / Q000473:pathology* / Q000503:physiopathology* / Q000532:radiotherapy; D011829:Radiation Dosage