苯并[a]芘恶性转化16HBE细胞元素组分析及铜与顺铂或长春瑞滨联用对细胞增殖的作用

Element profiles of benzo[a]pyrene malignantly transformed 16HBE cells and joint effects of copper with cisplatin or vinorelbine on cell proliferation

目的研究苯并[a]芘(BaP)致细胞恶性转化中元素组的变化,探讨铜与顺铂或长春瑞滨联用对细胞增殖的影响。方法以16HBE细胞和BaP恶性转化细胞T-16HBE-C1细胞为研究对象,采用电感耦合等离子质谱分析44种元素在2种细胞中的含量,采用偏最小二乘回归分析元素含量对2种细胞的区分能力,采用MTT法检测铜(0,237,340,487,1000和1432μmol·L^(-1))、顺铂(0,4.4,6.1,8.6,12.0和16.8μmol·L^(-1))和长春瑞滨(0,3.8,9.8,25.0,40.0和64.0μmol·L^(-1))对2种细胞存活率的影响,计算半数抑制浓度(IC_(50))。根据IC_(50)比例制备铜与顺铂混合物和铜与长春瑞滨混合物,采用MTT法检测其对细胞存活率的影响,并采用等效线图法分析铜与顺铂或长春瑞滨的联合作用。采用MTT法检测铜(0,50,100,200,400和800μmol·L^(-1))与IC_(50)的顺铂或长春瑞滨联用对T-16HBE-C1细胞存活率的影响。结果在2种细胞中共检出29种元素,其中铜、锌、银、硒和铷含量在T-16HBE-C1细胞中较16HBE细胞降低(P<0.01,P<0.05),钼、砷、锂、锗、锶、镍、镧、汞、铁和铯含量升高(P<0.01,P<0.05)。元素含量可用于区分16HBE和T-16HBE-C1细胞。铜可抑制16HBE和T-16HBE-C1细胞增殖,IC_(50)分别为(613±16)μmol·L^(-1)和(776±15)μmol·L^(-1)(P<0.01)。铜与顺铂混合物(1∶69.5)和铜与长春瑞滨混合物(1∶33.4)抑制T-16HBE-C1细胞增殖,且铜与顺铂和长春瑞滨具有相加作用。与单独IC_(50)浓度的顺铂(11.2μmol·L^(-1))或长春瑞滨(23.2μmol·L^(-1))相比,当铜>400μmol·L^(-1),其与IC_(50)浓度的顺铂或长春瑞滨联合作用可抑制T-16HBE-C1细胞增殖。结论16HBE细胞经BaP恶性转化后元素含量和相关关系发生改变。铜可抑制T-16HBE-C1细胞增殖,且在高浓度时与顺铂和长春瑞滨具有相加的联合作用。

OBJECTIVE To assess the profiles of elements in benzo[a]pyrene(BaP)induced carci⁃nogenesis,and explore the joint effects of copper with cisplatin or vinorelbine on cell proliferation.METHODS Forty-four elements were measured using an inductively coupled plasma mass spectrometer in 16HBE cells and BaP malignantly transformed 16HBE(T-16HBE-C1)cells.Partial least square was used to validate the robustness of cell classification of elements.Cell viability was measured by MTT assay for copper(0,237,340,487,1000 and 1432μmol·L^(-1)),cisplatin(0,4.4,6.1,8.6,12.0 and 16.8μmol·L^(-1)),and vinorelbine(0,3.8,9.8,25.0,40.0 and 64.0μmol·L^(-1))to acquire their half maximal inhibitory concentra⁃tion(IC_(50)).Mixtures of copper and chemotherapeutics were prepared according to the ratio of each IC_(50).Their joint effects on cell viability were assessed by MTT assay and isobolographic analysis.Inhibition effect of copper(0,50,100,200,400 and 800μmol·L^(-1))with IC_(50)of cisplatin or vinorelbine on prolifera⁃tion of T-16HBE-C1 cells was also assessed.RESULTS A total of 29 elements were quantified in 16HBE and T-16HBE-C1 cells,among which concentrations of copper,zinc,silver,selenium and rubidium decreased(P<0.05,P<0.01),while those of molybdenum,arsenic,lithium,germanium,strontium,nickel,lanthanum,mercury,iron,and cesium increased(P<0.05,P<0.01)in T-16HBE-C1 cells.Element concen⁃tration could be used to distinguish T-16HBE-C1 cells from 16HBE cells.Copper concentration-dependently inhibited proliferation of both cells,with a statistically significant lower IC_(50)of(613±16)μmol·L^(-1)in 16HBE cells than(776±15)μmol·L^(-1)in T-16HBE-C1 cells(P<0.01).Mixtures of copper and cisplatin(1∶69.5)or vinorelbine(1∶33.4)could inhibit cell proliferation,and copper had additive effects with cisplatin or vinorelbine.When copper concentration was higher than 400μmol·L^(-1),copper combined with IC_(50)of cisplatin or vinorelbine inhibited cell proliferation of T-16HBE-C1 cells compared with IC_(50)of cisplatin(11.2μmol·L^(-1))or vinorelbine(23.2μmol·L^(-1))alone.CONCLUSION Element profiles and correlations can change significantly after 16HBE cells are malignantly transformed by BaP.Copper could inhibit the proliferation of T-16HBE-C1 cells and have additive effects with cisplatin or vinorelbine in higher concentration.