To establish a cytologic expressing system of rat glutathione S-transferase pi (GST-pi) cDNA for detecting the resistance of HeLa cells to anticancer drugs. Methods The assessment was made with various anticancer dr...To establish a cytologic expressing system of rat glutathione S-transferase pi (GST-pi) cDNA for detecting the resistance of HeLa cells to anticancer drugs. Methods The assessment was made with various anticancer drugs (adriamycin, mitomycin, cisplatinum and vincristine) that showed different cytotoxicities in transfectant HeLa cells with pSV-GT containing rat GST-pi cDNA (HeLa/pSV-GT) or control pSV-neo (HeLa/pSV-neo). Expression levels of GST-pi mRNA in HeLa/pSV-GT and HeLa/pSV-neo were measured by in situ hybridization using Digoxin-labelled cDNA probe. Results HeLa/pSV-GT expressed significantly high degree of GST-pi mRNA, whereas both HeLa/pSV-neo and HeLa cells had very low expression. Cytotoxicities of HeLa/pSV-GT and HeLa/pSV-neo with 4 anticancer drugs were measured by MTT assay. Drug concentrations for yielding 50% inhibition (IC50) in HeLa/pSV-GT by adriamycin, mitomycin and cisplatinum were 70.13 靏/mL, 10.95 靏/mL and 16.52 靏/mL, respectively. In contrast, IC50 in HeLa/pSV-neo was 10.34 靏/mL, 7.48 靏/mL and 13.70 靏/mL, respectively. The cytotoxicities of vincristine on both HeLa/pSV-GT and HeLa/pSV-neo were not significantly different. Conclusions Our findings suggest that HeLa/pSV-GT containing rat GST-pi cDNA is resistant to some anticancer drugs due to overexpression of GST-pi. Also, HeLa/pSV-GT cell line could serve as a useful cytogenetic model for further research.展开更多
Atherosclerosis plays an important role in ischemic stroke, and oxidative stress participates in the entire process of atherosclerosis. Glutathione S-transferase （GST） acting with other antioxidant enzymes can elimi...Atherosclerosis plays an important role in ischemic stroke, and oxidative stress participates in the entire process of atherosclerosis. Glutathione S-transferase （GST） acting with other antioxidant enzymes can eliminate reactive oxygen species and protect cells against oxidative damage. To assess the association of glutathione S-transferase （GSTT1 and GSTM1） gene polymorphisms with ischemic stroke in the Chinese Han population, the present study selected 315 patients with ischemic stroke and 210 healthy controls for comparison. GSTT1 and GSTM1 genotypes were determined using polymerase chain reactions, electrophoresis and imaging analysis. No obvious evidence of GSTTI-nulI, GSTMI-null and GSTTI/GSTMI-double null genotype distribution differences was found between case and control groups or between genders. Subgroup analysis showed that the risk of stroke was increased when hypertension was accompanied by GSTTl-null （odds ratio （OR） = 2.996, P 〈 0.001） and GSTMl-null （OR = 3.680, P 〈 0.001 ） genotypes; diabetes mellitus was accompanied by GSTTI-null （OR = 1.860, P = 0.031） and GSTMI-null （OR = 2.444, P = 0.002） genotypes, and smokers showed a GSTTl-null genotype （OR = 2.276, P = 0.003）. GSTT1- and GSTMl-null genotypes may interact synergistically with hypertension, diabetes mellitus and smoking to increase the incidence risk of ischemic stroke.展开更多
目的通过筛查GSTM1基因SNPs位点,研究该基因编码区单核苷酸多态位点T1270533G与鼻咽癌易感性和临床表型的关系。方法用PCR方法对中国人群27个个体DNA标本进行扩增、纯化及测序,从中获得GSTM1编码区、调控区和侧翼区及部分内含子区SNP位...目的通过筛查GSTM1基因SNPs位点,研究该基因编码区单核苷酸多态位点T1270533G与鼻咽癌易感性和临床表型的关系。方法用PCR方法对中国人群27个个体DNA标本进行扩增、纯化及测序,从中获得GSTM1编码区、调控区和侧翼区及部分内含子区SNP位点,所获数据进行LD分析。选择编码区多态性位点T1270533G(该位点在中国人群罕见等位基因频率为22.2%),用tetra-Primer ARMS-PCR结合测序方法对鼻咽癌患者和对照人群进行相关性分析。结果通过测序共获取29个SNPs;其中13个SNPs位点之间均呈高度连锁不平衡;编码区多态性位点T1270533G的变异与鼻咽癌临床表型之间无明显关联(RR=0.170,95%CI=0.95-0.306 for homozygoteTT)。结论编码区多态位点T1270533G虽然发生了碱基顛换,产生了错义突变,导致了氨基酸的改变,但并没有影响其解毒功能。该位点在鼻咽癌患者和对照人群中等位基因型频率差别很小,与中国广东地区鼻咽癌易感性无明显关联。展开更多
基金the National Natural Science Foundation of China.
文摘To establish a cytologic expressing system of rat glutathione S-transferase pi (GST-pi) cDNA for detecting the resistance of HeLa cells to anticancer drugs. Methods The assessment was made with various anticancer drugs (adriamycin, mitomycin, cisplatinum and vincristine) that showed different cytotoxicities in transfectant HeLa cells with pSV-GT containing rat GST-pi cDNA (HeLa/pSV-GT) or control pSV-neo (HeLa/pSV-neo). Expression levels of GST-pi mRNA in HeLa/pSV-GT and HeLa/pSV-neo were measured by in situ hybridization using Digoxin-labelled cDNA probe. Results HeLa/pSV-GT expressed significantly high degree of GST-pi mRNA, whereas both HeLa/pSV-neo and HeLa cells had very low expression. Cytotoxicities of HeLa/pSV-GT and HeLa/pSV-neo with 4 anticancer drugs were measured by MTT assay. Drug concentrations for yielding 50% inhibition (IC50) in HeLa/pSV-GT by adriamycin, mitomycin and cisplatinum were 70.13 靏/mL, 10.95 靏/mL and 16.52 靏/mL, respectively. In contrast, IC50 in HeLa/pSV-neo was 10.34 靏/mL, 7.48 靏/mL and 13.70 靏/mL, respectively. The cytotoxicities of vincristine on both HeLa/pSV-GT and HeLa/pSV-neo were not significantly different. Conclusions Our findings suggest that HeLa/pSV-GT containing rat GST-pi cDNA is resistant to some anticancer drugs due to overexpression of GST-pi. Also, HeLa/pSV-GT cell line could serve as a useful cytogenetic model for further research.
文摘Atherosclerosis plays an important role in ischemic stroke, and oxidative stress participates in the entire process of atherosclerosis. Glutathione S-transferase （GST） acting with other antioxidant enzymes can eliminate reactive oxygen species and protect cells against oxidative damage. To assess the association of glutathione S-transferase （GSTT1 and GSTM1） gene polymorphisms with ischemic stroke in the Chinese Han population, the present study selected 315 patients with ischemic stroke and 210 healthy controls for comparison. GSTT1 and GSTM1 genotypes were determined using polymerase chain reactions, electrophoresis and imaging analysis. No obvious evidence of GSTTI-nulI, GSTMI-null and GSTTI/GSTMI-double null genotype distribution differences was found between case and control groups or between genders. Subgroup analysis showed that the risk of stroke was increased when hypertension was accompanied by GSTTl-null （odds ratio （OR） = 2.996, P 〈 0.001） and GSTMl-null （OR = 3.680, P 〈 0.001 ） genotypes; diabetes mellitus was accompanied by GSTTI-null （OR = 1.860, P = 0.031） and GSTMI-null （OR = 2.444, P = 0.002） genotypes, and smokers showed a GSTTl-null genotype （OR = 2.276, P = 0.003）. GSTT1- and GSTMl-null genotypes may interact synergistically with hypertension, diabetes mellitus and smoking to increase the incidence risk of ischemic stroke.
文摘目的通过筛查GSTM1基因SNPs位点,研究该基因编码区单核苷酸多态位点T1270533G与鼻咽癌易感性和临床表型的关系。方法用PCR方法对中国人群27个个体DNA标本进行扩增、纯化及测序,从中获得GSTM1编码区、调控区和侧翼区及部分内含子区SNP位点,所获数据进行LD分析。选择编码区多态性位点T1270533G(该位点在中国人群罕见等位基因频率为22.2%),用tetra-Primer ARMS-PCR结合测序方法对鼻咽癌患者和对照人群进行相关性分析。结果通过测序共获取29个SNPs;其中13个SNPs位点之间均呈高度连锁不平衡;编码区多态性位点T1270533G的变异与鼻咽癌临床表型之间无明显关联(RR=0.170,95%CI=0.95-0.306 for homozygoteTT)。结论编码区多态位点T1270533G虽然发生了碱基顛换,产生了错义突变,导致了氨基酸的改变,但并没有影响其解毒功能。该位点在鼻咽癌患者和对照人群中等位基因型频率差别很小,与中国广东地区鼻咽癌易感性无明显关联。
