目的探讨膀胱癌细胞中着色性干皮病C组基因(xeroderma pigmentosum group C,XPC)蛋白缺失对自噬的影响。方法利用shRNA策略,建立稳定干扰XPC的膀胱癌T24细胞模型,蛋白印迹技术检测干扰XPC后自噬表征蛋白LC3Ⅱ的表达,瞬时转染GFP-LC3,荧...目的探讨膀胱癌细胞中着色性干皮病C组基因(xeroderma pigmentosum group C,XPC)蛋白缺失对自噬的影响。方法利用shRNA策略,建立稳定干扰XPC的膀胱癌T24细胞模型,蛋白印迹技术检测干扰XPC后自噬表征蛋白LC3Ⅱ的表达,瞬时转染GFP-LC3,荧光显微镜观察细胞荧光聚集情况,CCK-8法检测细胞的增殖状况,免疫印迹技术检测自噬及凋亡相关蛋白的表达。结果成功建立干扰XPC的膀胱癌T24细胞模型;干扰XPC后,膀胱癌T24细胞自噬小体的形成[(1.53±0.81)%vs(3.30±0.70)%,P<0.05]明显减少,顺铂作用下膀胱癌T24细胞自噬小体的形成[(2.19±0.37)%vs(3.20±0.29)%,P<0.05]明显减少;顺铂促进XPC缺失后的膀胱癌T24细胞自噬;XPC缺失后的自噬为非保护性自噬。结论 XPC蛋白参与调控膀胱癌T24细胞的自噬。展开更多
目的:探讨野生型X P D基因对人胆管癌QBC939细胞的生物学影响.方法:用碱裂解法提取空载质粒pEGFP-N2和重组质粒pEGFP-N2-XPD,提取出的质粒以KPNⅠ、BGIⅡ和SPHⅠ酶切鉴定.实验分4组,重组质粒pEGFP-N2-XPD组、空载质粒pEGFP-N2组、脂质体...目的:探讨野生型X P D基因对人胆管癌QBC939细胞的生物学影响.方法:用碱裂解法提取空载质粒pEGFP-N2和重组质粒pEGFP-N2-XPD,提取出的质粒以KPNⅠ、BGIⅡ和SPHⅠ酶切鉴定.实验分4组,重组质粒pEGFP-N2-XPD组、空载质粒pEGFP-N2组、脂质体组,并用具有相同遗传背景和代数的QBC939细胞作为空白对照.用脂质体转染法瞬时转染四组细胞.荧光显微镜下观察转染后绿色荧光蛋白报告基因表达情况.提取各组细胞总RNA,合成cDNA,用聚合酶链反应(PCR)检测4组细胞中XPD、p53、cyclin D1、c-myc表达情况.并用四甲基偶氮唑盐(MTT)和流式细胞仪检测细胞增殖及其细胞周期的变化.结果:pEGFP-N2-XPD细胞与pEGFP-N2、脂质体组和空白对照组相比,XPD mRNA表达量明显增加(0.778±0.018vs0.561±0.039,0.544±0.035,0.542±0.034,均P<0.01).pEGFP-N2-XPD细胞中p53mRNA相对表达量与pEGFP-N2、脂质体组和空白对照组比较具有统计学意义(0.421±0.019vs0.256±0.014,0.267±0.015,0.274±0.018,均P<0.01).pEGFP-N2-XPD细胞与其他组相比,cyclin D1mRNA相对表达量明显降低(0.339±0.041vs0.560±0.039,0.558±0.050,0.560±0.041,均P<0.01).pEGFP-N2-XPD细胞与其他组相比,c-myc mRNA相对表达量明显降低(0.355±0.045vs0.570±0.075,0.560±0.041,0.537±0.050,均P<0.01).流式细胞仪检测pEGFP-N2-XPD组细胞周期G1期为81.65%,S期为11.83%,其他组Gl期分别为65.54%、56.61%、63.26%;S期分别为24.10%、29.52%、27.28%,结果具有统计学意义(P<0.05).MTT检测示pEGFP-N2-XPD细胞生长率为0.249±0.02,与其他组相比,细胞增殖力明显减弱(P<0.01).结论:野生型XPD基因可以抑制胆管癌细胞的生长,XPD基因可抑制c-myc、cyclin D1基因的表达,增加p53基因表达.展开更多
AIM: To investigate the risk association of xeroderma pigmentosum group C (XPC ) Lys939Gln polymorphism alone and in combination with cigarette smoking on colorectal cancer (CRC) predisposition. METHODS: Peripheral bl...AIM: To investigate the risk association of xeroderma pigmentosum group C (XPC ) Lys939Gln polymorphism alone and in combination with cigarette smoking on colorectal cancer (CRC) predisposition. METHODS: Peripheral blood samples of 510 study subjects (255 CRC patients, 255 controls)were collected. DNA was extracted and genotyping was performed using polymerase chain reaction-restriction fragment length polymorphism. The association between polymorphic genotype and CRC predisposition was determined using the OR and 95%CI. RESULTS: The frequency of the homozygous variant (Gln/Gln) genotype was significantly higher in cases compared with controls (16.0% vs 10.2%, P = 0.049). The Gln/Gln genotype of XPC showed a significantly higher association with the risk of CRC (OR = 1.884; 95%CI: 1.082-3.277; P = 0.025). In the case of allele frequencies, variant allele C was associated with a significantly increased risk of CRC (OR = 1.375; 95%CI: 1.050-1.802; P = 0.020). Moreover, the risk was markedly higher for those who were carriers of the Gln/Gln variant genotype and were also cigarette smokers (OR = 3.409; 95%CI: 1.061-10.949; P = 0.032). CONCLUSION: The XPC Gln/Gln genotype alone and in combination with smoking increases the risk of CRC among Malaysians.展开更多
Background Platinum-based chemotherapeutics are the most common regimens for advanced non-small-cell lung cancer （NSCLC） patients, and genetic factors are thought to represent important determinants of drug efficacy...Background Platinum-based chemotherapeutics are the most common regimens for advanced non-small-cell lung cancer （NSCLC） patients, and genetic factors are thought to represent important determinants of drug efficacy. We prospectively assessed the status of the XPC Ala499Val and Lys939GIn gene polymorphisms and investigated whether these SNPs can predict the response to cisplatin/carboplatin-based regimens in advanced NSCLC patients in a Chinese population.Methods The treatment outcomes of 96 advanced NSCLC patients who were treated with platinum-based chemotherapy were evaluated. The polymorphic status of xeroderma pigmentosum group C （XPC） gene was genotyped by the 3-D polyacrylamide gel-based DNA microarray method.Results The distributions of XPC Lys939GIn genotypes differed significantly between the response group （complete ＋partial responses） and the non-response group （stable ＋ progressive disease; P=0.022）. The heterozygous A/C genotype carriers had a poorer response rate than the wild A/A genotype carriers in stage Ⅲ （OR, 0.074; 95% CI,0.008-0.704; P=0.023）. The XPC Ala499Val polymorphisms were not associated with response to platinum-based chemotherapy.Conclusion Polymorphisms of the XPC gene, Lys939GIn, may be a predictive marker of treatment response for advanced NSCLC patients in stage Ⅲ.展开更多
目的观察着色性干皮病C组基因(XPC)缺失对间充质干细胞(MSCs)衰老的影响,并探讨其机制。方法分离培养XPC敲除(XPC-/-)小鼠及野生型(WT)小鼠骨髓MSCs,流式细胞仪检测培养细胞表面标志表达,CCK8法检测细胞增殖情况,茜素红染色以及油红O染...目的观察着色性干皮病C组基因(XPC)缺失对间充质干细胞(MSCs)衰老的影响,并探讨其机制。方法分离培养XPC敲除(XPC-/-)小鼠及野生型(WT)小鼠骨髓MSCs,流式细胞仪检测培养细胞表面标志表达,CCK8法检测细胞增殖情况,茜素红染色以及油红O染色观察成骨分化及成脂分化能力,衰老相关β半乳糖苷酶(SA-β-gal)染色检测细胞衰老情况,实时定量聚合酶链式反应(Real-time PCR)检测衰老相关基因P16、P21 mRNA表达情况。结果分离培养的两组小鼠骨髓来源的MSCs(m BMSCs)均高表达阳性表面抗原标志物CD44、CD29,基本不表达阴性表面抗原标志物CD11b、CD45,但均具有成骨及成脂分化能力。体外培养至20 PD(群体倍增水平)时,XPC-/-m BMSCs中衰老细胞比例(44.41±5.49)%,明显高于WT m BMSCs的(13.17±1.54)%(P<0.01);与WT m BMSCs相比,XPC-/-m BMSCs增殖能力明显下降(4 d时OD值:0.18±0.04 vs 0.36±0.04,P<0.05;5 d时OD值:0.27±0.04 vs 0.56±0.05,P<0.01);XPC-/-m BMSCs中P16 mRNA相对表达量与WT细胞相比无明显差异(P>0.05),而XPC-/-m BMSCs中P21 mRNA相对表达量明显高于WT细胞(3.30±0.23 vs 1.00±0.09,P<0.01);XPC敲除组细胞生长缓慢,出现衰老表型,增殖能力明显下降,SA-β-gal染色阳性率明显高于野生型细胞(P<0.01),衰老相关基因P21表达与野生型相比明显上调(P<0.01)。结论 XPC敲除促进MSCs衰老,其机制可能是由于DNA损伤累积引起的P21/P53信号通路的激活。展开更多
文摘目的探讨膀胱癌细胞中着色性干皮病C组基因(xeroderma pigmentosum group C,XPC)蛋白缺失对自噬的影响。方法利用shRNA策略,建立稳定干扰XPC的膀胱癌T24细胞模型,蛋白印迹技术检测干扰XPC后自噬表征蛋白LC3Ⅱ的表达,瞬时转染GFP-LC3,荧光显微镜观察细胞荧光聚集情况,CCK-8法检测细胞的增殖状况,免疫印迹技术检测自噬及凋亡相关蛋白的表达。结果成功建立干扰XPC的膀胱癌T24细胞模型;干扰XPC后,膀胱癌T24细胞自噬小体的形成[(1.53±0.81)%vs(3.30±0.70)%,P<0.05]明显减少,顺铂作用下膀胱癌T24细胞自噬小体的形成[(2.19±0.37)%vs(3.20±0.29)%,P<0.05]明显减少;顺铂促进XPC缺失后的膀胱癌T24细胞自噬;XPC缺失后的自噬为非保护性自噬。结论 XPC蛋白参与调控膀胱癌T24细胞的自噬。
基金Supported by Fundamental Research Grant Scheme (FRGS),No.203/PPSP/6171112
文摘AIM: To investigate the risk association of xeroderma pigmentosum group C (XPC ) Lys939Gln polymorphism alone and in combination with cigarette smoking on colorectal cancer (CRC) predisposition. METHODS: Peripheral blood samples of 510 study subjects (255 CRC patients, 255 controls)were collected. DNA was extracted and genotyping was performed using polymerase chain reaction-restriction fragment length polymorphism. The association between polymorphic genotype and CRC predisposition was determined using the OR and 95%CI. RESULTS: The frequency of the homozygous variant (Gln/Gln) genotype was significantly higher in cases compared with controls (16.0% vs 10.2%, P = 0.049). The Gln/Gln genotype of XPC showed a significantly higher association with the risk of CRC (OR = 1.884; 95%CI: 1.082-3.277; P = 0.025). In the case of allele frequencies, variant allele C was associated with a significantly increased risk of CRC (OR = 1.375; 95%CI: 1.050-1.802; P = 0.020). Moreover, the risk was markedly higher for those who were carriers of the Gln/Gln variant genotype and were also cigarette smokers (OR = 3.409; 95%CI: 1.061-10.949; P = 0.032). CONCLUSION: The XPC Gln/Gln genotype alone and in combination with smoking increases the risk of CRC among Malaysians.
基金This work was supported by the grants from the Prophase Force-Study Program of the Jiangsu Province Natural Science Foundation （No. BK2005203）, the Medical Science Technology Research ＂Eleventh Five-Year＂ Program of the People＇s Liberation Army （No. 06MAlll）, and the Focal Project of Nanjing Medical Technology Development （No. ZKX05030）.
文摘Background Platinum-based chemotherapeutics are the most common regimens for advanced non-small-cell lung cancer （NSCLC） patients, and genetic factors are thought to represent important determinants of drug efficacy. We prospectively assessed the status of the XPC Ala499Val and Lys939GIn gene polymorphisms and investigated whether these SNPs can predict the response to cisplatin/carboplatin-based regimens in advanced NSCLC patients in a Chinese population.Methods The treatment outcomes of 96 advanced NSCLC patients who were treated with platinum-based chemotherapy were evaluated. The polymorphic status of xeroderma pigmentosum group C （XPC） gene was genotyped by the 3-D polyacrylamide gel-based DNA microarray method.Results The distributions of XPC Lys939GIn genotypes differed significantly between the response group （complete ＋partial responses） and the non-response group （stable ＋ progressive disease; P=0.022）. The heterozygous A/C genotype carriers had a poorer response rate than the wild A/A genotype carriers in stage Ⅲ （OR, 0.074; 95% CI,0.008-0.704; P=0.023）. The XPC Ala499Val polymorphisms were not associated with response to platinum-based chemotherapy.Conclusion Polymorphisms of the XPC gene, Lys939GIn, may be a predictive marker of treatment response for advanced NSCLC patients in stage Ⅲ.
文摘目的观察着色性干皮病C组基因(XPC)缺失对间充质干细胞(MSCs)衰老的影响,并探讨其机制。方法分离培养XPC敲除(XPC-/-)小鼠及野生型(WT)小鼠骨髓MSCs,流式细胞仪检测培养细胞表面标志表达,CCK8法检测细胞增殖情况,茜素红染色以及油红O染色观察成骨分化及成脂分化能力,衰老相关β半乳糖苷酶(SA-β-gal)染色检测细胞衰老情况,实时定量聚合酶链式反应(Real-time PCR)检测衰老相关基因P16、P21 mRNA表达情况。结果分离培养的两组小鼠骨髓来源的MSCs(m BMSCs)均高表达阳性表面抗原标志物CD44、CD29,基本不表达阴性表面抗原标志物CD11b、CD45,但均具有成骨及成脂分化能力。体外培养至20 PD(群体倍增水平)时,XPC-/-m BMSCs中衰老细胞比例(44.41±5.49)%,明显高于WT m BMSCs的(13.17±1.54)%(P<0.01);与WT m BMSCs相比,XPC-/-m BMSCs增殖能力明显下降(4 d时OD值:0.18±0.04 vs 0.36±0.04,P<0.05;5 d时OD值:0.27±0.04 vs 0.56±0.05,P<0.01);XPC-/-m BMSCs中P16 mRNA相对表达量与WT细胞相比无明显差异(P>0.05),而XPC-/-m BMSCs中P21 mRNA相对表达量明显高于WT细胞(3.30±0.23 vs 1.00±0.09,P<0.01);XPC敲除组细胞生长缓慢,出现衰老表型,增殖能力明显下降,SA-β-gal染色阳性率明显高于野生型细胞(P<0.01),衰老相关基因P21表达与野生型相比明显上调(P<0.01)。结论 XPC敲除促进MSCs衰老,其机制可能是由于DNA损伤累积引起的P21/P53信号通路的激活。
