机构地区:[1]北京大学公共卫生学院劳动卫生与环境卫生学系,北京100191 [2]上海大学纳米化学与生物学研究所,上海200444 [3]北京大学化学与分子工程学院,北京100871
出 处:《北京大学学报(医学版)》2013年第3期405-411,410-411,共7页Journal of Peking University:Health Sciences
基 金:国家重点基础研究发展计划(973计划;2011CB933402)资助~~
摘 要:目的:比较不同长度和表面修饰的多壁碳纳米管(multi-walled carbon nanotubes,MWCNTs)对人肺泡Ⅱ型上皮细胞(A549细胞)的细胞毒性和遗传毒性的影响。方法:选取长(515μm)、短(350700 nm)两种不同长度的MWCNTs,及羧基(carboxyl,COOH-)、氨基(amino,NH2-)和牛磺酸(taurine,Tau-)3种不同表面修饰的MWCNTs分别进行实验研究,其中短的MWCNTs作为未修饰的MWCNTs(Pristine-MWCNTs)与表面修饰的MWCNTs进行比较。细胞毒性实验采用cell counting kit-8(CCK-8)法,染毒浓度为2、8、32 mg/L,染毒时间分别为12、24、36、48 h;遗传毒性采用单细胞凝胶电泳实验检测DNA链断裂,染毒剂量为8 mg/L,染毒时间24 h。结果:两种长度的MWCNTs在所观察的1248 h染毒时间内,均表现出剂量依赖的细胞毒性;其中在2448 h处理时间组,MWCNTs的细胞毒性随长度增加而增大。经过表面修饰的3种MWCNTs与未修饰的MWCNTs相比,表面修饰过的MWCNTs在染毒时间12 h、染毒浓度为32 mg/L时相对细胞活性:COOH-MWCNTs为(86.55±1.80)%、NH2-MWCNTs为(84.67±1.32)%、Tau-MWCNTs为(80.15±3.53)%,均高于未修饰MWCNTs的细胞活性(71.44±5.58)%,差异具有统计学意义(P<0.05);在染毒时间24 h、染毒浓度为8 mg/L时修饰过的MWCNTs相对细胞活性:COOH-MWCNTs为(96.74±1.00)%、NH2-MWCNTs为(96.74±3.35)%、Tau-MWCNTs为(106.39±3.83)%,均高于未修饰MWCNTs的细胞活性(91.02±2.53)%,差异具有统计学意义(P<0.05);在染毒时间24 h、染毒浓度为32 mg/L时修饰过的MWCNTs相对细胞活性:COOH-MWCNTs为(80.88±2.67)%、NH2-MWCNTs为(82.90±3.25)%、Tau-MWCNTs为(82.55±3.32)%,均高于未修饰MWCNTs的细胞活性(76.08±4.27)%,差异具有统计学意义(P<0.05);在染毒时间36 h、染毒浓度为8 mg/L时修饰过的MWCNTs相对细胞活性:COOH-MWCNTs为(96.87±1.05)%、NH2-MWCNTs为(96.66±4.76)%、Tau-MWCNTs为(100.23±2.84)%,均高于未修饰MWCNTs的细胞活性(89.61±3.78)%,差异具有统计学意义(P<0.05)。在其他观察时间和染毒浓度Objective:To compare the cytotoxicity and DNA strand breakage induced by multi-walled carbon nanotubes (MWCNTs) with different lengths and different surface modifications in human alveolar type II cells (A549 cells). Methods: Two different lengths (5 -15 nm, 350 -700 nm) of MWCNTs and three different kinds of surface modified MWCNTs (COOH-MWCNTs, NHE-MWCNTs, and Tau- MWCNTs) were used in the experiments. The short MWCNTs were used as pristine MWCNTs to compare with the 3 surface modified MWCNTs. The cytotoxicity was determined by cell counting kit-8 (CCK-8) assay at the concentrations of 2, 8, and 32 mg/L at hours 12, 24, 36, and 48 respectively. Single cell gel electrophoresis (SCGE) assay was performed to evaluate DNA strand breakage in A549 cells after 24 h treatment of 8 mg/L of each tested material. Results: Long multi-walled carbon nanotubes (Long- MWCNTs) and short multi-walled carbon nanotubes (Short-MWCNTs) showed a dose-dependent cytotoxicity within the exposure time 12 -48 h. Especially, Long-MWCNTs showed greater cytotoxicity than Short-MWCNTs from 24 to 48 h at the same concentration. The relative cell viability of the 3 surface modified MWCNTs was higher than that of the pristine MWCNTs at h 12 at the concentration of 32 mg/L [ COOH-MWCNTs (86.55 ±1.80) %, NH2-MWCNTs ( 84.67 ± 1.32 ) %, Tau-MWCNTs ( 80. 15 ± 3.53 ) % and Pristine-MWCNTs (71.44 ± 5.58) % ], at h 24 at the concentration of 8 mg/L [ COOH- MWCNTs (96.74 ± 1.00) %, NH2-MWCNTs (96.74 ± 3.35 ) %, Tau-MWCNTs ( 106.39 ± 3.83 ) % and Pristine-MWCNTs (91.02 ± 2.53) % ], at h 24 at the concentration of 32 mg/L [ COOH-MWCNTs (80.88 ± 2.67 ) %, NH2-MWCNTs (82.90 ± 3.25 ) %, Tau-MWCNTs (82.55 ± 3.32) % and Pristine- MWCNTs (76.08 ± 4.27)% ] and at h 36 at the concentration of 8 mg/L [ COOH-MWCNTs (96.87 ± 1.05 ) %, NH2-MWCNTs (96.66 ± 4.76) %, Tau-MWCNTs ( 100.23 ± 2.84 ) % and Pristine-MWC- NTs ( 89.61 ± 3.78 ) % ], and the differ
关 键 词:纳米管 碳 细胞毒性 免疫 诱变力试验 肺泡 上皮细胞
分 类 号:R318.08[医药卫生—生物医学工程]
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