Objective To develop an improved substrate for indirect immunofluorescence test (IIF) for detecting anti-Ro60/Sjogren's syndrome A (Ro/SSA) autoantibodies.Methods 60-kDa Ro/SSA autoantigens (Ro60) cDNAs were obtai...Objective To develop an improved substrate for indirect immunofluorescence test (IIF) for detecting anti-Ro60/Sjogren's syndrome A (Ro/SSA) autoantibodies.Methods 60-kDa Ro/SSA autoantigens (Ro60) cDNAs were obtained from human placental cDNA library using polymerase chain reaction (PCR) and were cloned into the mammalian expression vector-pEGFP-C1. Then, the recombinant plasmids were transfected into HEp-2 cells. We confirmed the overexpression, localization and antigenicity of fusion proteins in transfected cells by means of immunoblotting, confocal fluorescence microscopy and IIF. HEp-2 and HEp-Ro60 were analyzed by IIF using a panel of 10 precipitin-positive anti-Ro human sera simultaneously.Results Stable expression of Ro60-green fluorescent protein (Ro60-GFP) fusion proteins were maintained ten more generations. Ro60-GFP kept the antigenicity of Ro while demonstrating its own characteristic immunofluorescent pattern in HEp-Ro60 cells. The transfectants dramatically increased the sensitivity of IIF testing (a mean increase of 6.7-fold in endpoint titer). Eight overten (8/10) positive anti-Ro sera showed characteristic immunofluorescent patterns for HEp-Ro60, including two sera that were anti-nuclear antibodies (ANA) negative for untransfected HEp-2. IIF-ANA in all healthy sera was negative for HEp-Ro60. Conclusions As a new substrate for IIF, the Ro60 transfectants can be used to detect anti-Ro antibodies. In addition, transfected HEp-2 cells keep the immunofluorescent properties of HEp-2 cells in IIF-ANA tests and can be employed as a substrate for routine IIF-ANA detection.展开更多
目的:对Ro 60反义核酸在逆转胃癌细胞多药耐药中作用进行研究.方法:克隆Ro 60编码基因,构建Ro 60编码基因的反义真核表达载体,将其转导入SGC7901细胞,应用半定量RT-PCR技术,对基因转染细胞进行鉴定,通过MTT法进行体外药物敏感性分析,...目的:对Ro 60反义核酸在逆转胃癌细胞多药耐药中作用进行研究.方法:克隆Ro 60编码基因,构建Ro 60编码基因的反义真核表达载体,将其转导入SGC7901细胞,应用半定量RT-PCR技术,对基因转染细胞进行鉴定,通过MTT法进行体外药物敏感性分析,借助流式细胞仪检测细胞内蓄积的阿霉素.结果:成功构建了Ro 60反义真核表达载体,应用脂质体介导法将其转导入SGC7901-VCR, Ro 60反义真核表达载体转染SGC7901-VCR细胞后,Ro 60的表达量明显下降,体外药物敏感性实验提示其对长春新碱、丝裂霉素、顺铂、阿霉素的敏感性增加,转染反义表达载体的SGC7901-VCR细胞与未转染和转染空载体的细胞相比,IC50值(mg/L)有显著的下降(7.66±0.45 vs 19.56±0.38,17.48±0.85;0.84±0.03 vs 1.62±0.06.1.80±0.03;0.51±0.03 vs 0.87±0.03.0.88±0.03;0.22±0.01 vs 0.52±0.02,0.43±0.03,均P<0.01),细胞内阿霉素蓄积有显著的增加(51.94±1.26 mg/L vs 36.27±0.98,37.01±0.91 mg/L,P<0.01).结论:Ro 60反义真核表达载体转染SGC7901后能够抑制胃癌细胞的多药耐药表型.展开更多
基金ThisstudywassupportedbyShanghaiScienceCommitteeFoundationofChina (No 9844 190 73 )
文摘Objective To develop an improved substrate for indirect immunofluorescence test (IIF) for detecting anti-Ro60/Sjogren's syndrome A (Ro/SSA) autoantibodies.Methods 60-kDa Ro/SSA autoantigens (Ro60) cDNAs were obtained from human placental cDNA library using polymerase chain reaction (PCR) and were cloned into the mammalian expression vector-pEGFP-C1. Then, the recombinant plasmids were transfected into HEp-2 cells. We confirmed the overexpression, localization and antigenicity of fusion proteins in transfected cells by means of immunoblotting, confocal fluorescence microscopy and IIF. HEp-2 and HEp-Ro60 were analyzed by IIF using a panel of 10 precipitin-positive anti-Ro human sera simultaneously.Results Stable expression of Ro60-green fluorescent protein (Ro60-GFP) fusion proteins were maintained ten more generations. Ro60-GFP kept the antigenicity of Ro while demonstrating its own characteristic immunofluorescent pattern in HEp-Ro60 cells. The transfectants dramatically increased the sensitivity of IIF testing (a mean increase of 6.7-fold in endpoint titer). Eight overten (8/10) positive anti-Ro sera showed characteristic immunofluorescent patterns for HEp-Ro60, including two sera that were anti-nuclear antibodies (ANA) negative for untransfected HEp-2. IIF-ANA in all healthy sera was negative for HEp-Ro60. Conclusions As a new substrate for IIF, the Ro60 transfectants can be used to detect anti-Ro antibodies. In addition, transfected HEp-2 cells keep the immunofluorescent properties of HEp-2 cells in IIF-ANA tests and can be employed as a substrate for routine IIF-ANA detection.
文摘目的:对Ro 60在胃癌多药耐药中的功能进行研究.方法:克隆Ro 60编码基因,构建Ro 60编码基因的正义真核表达载体,将其转导入SGC7901 细胞,应用半定量RT-PCR技术,对基因转染细胞进行鉴定,通过MTT法进行体外药物敏感性分析,借助流式细胞仪检测细胞内蓄积的阿霉素.结果:成功构建了Ro 60正义真核表达载体, 应用脂质体介导法将其转导入SGC7901,Ro 60真核表达载体转染SGC7901细胞后其表达量明显增加,体外药物敏感性试验提示其对长春新碱、5-氟尿嘧啶、丝裂霉素、顺铂、阿霉素的敏感性减低,SGC7901细胞的IC50值 (mg/L)与未转染细胞和转染空白载体细胞相比,显著增加(2.28±0.11 vs 0.45±0.04,0.65 ±0.05;2.89±0.14 vs 0.61±0.21,0.90±0.11; 1.92±0.03 vs 0.54±0.03,0.75±0.21;1.41± 0.06 vs 0.45±0.03,0.54±0.03;0.28±0.03 vs 0.14±0.01,0.14±0.01;均P<0.01),细胞内阿霉素蓄积显著减少(56.30±2.49 mg/L vs 92.83 ±3.63,87.38±2.94 mg/L,P<0.01).结论:Ro 60真核表达载体转染SGC7901细胞后显示了一些多药耐药的特性,提示Ro 60在胃癌多药耐药中发挥了一定的作用.
文摘目的:对Ro 60反义核酸在逆转胃癌细胞多药耐药中作用进行研究.方法:克隆Ro 60编码基因,构建Ro 60编码基因的反义真核表达载体,将其转导入SGC7901细胞,应用半定量RT-PCR技术,对基因转染细胞进行鉴定,通过MTT法进行体外药物敏感性分析,借助流式细胞仪检测细胞内蓄积的阿霉素.结果:成功构建了Ro 60反义真核表达载体,应用脂质体介导法将其转导入SGC7901-VCR, Ro 60反义真核表达载体转染SGC7901-VCR细胞后,Ro 60的表达量明显下降,体外药物敏感性实验提示其对长春新碱、丝裂霉素、顺铂、阿霉素的敏感性增加,转染反义表达载体的SGC7901-VCR细胞与未转染和转染空载体的细胞相比,IC50值(mg/L)有显著的下降(7.66±0.45 vs 19.56±0.38,17.48±0.85;0.84±0.03 vs 1.62±0.06.1.80±0.03;0.51±0.03 vs 0.87±0.03.0.88±0.03;0.22±0.01 vs 0.52±0.02,0.43±0.03,均P<0.01),细胞内阿霉素蓄积有显著的增加(51.94±1.26 mg/L vs 36.27±0.98,37.01±0.91 mg/L,P<0.01).结论:Ro 60反义真核表达载体转染SGC7901后能够抑制胃癌细胞的多药耐药表型.