目的探讨孤立性纤维性肿瘤(solitary fibrous tumour,SFT)的临床病理特征及免疫组织化学标志物信号转导及转录激活因子6(signal transducers and activators of transcription6,STAT6)的临床病理诊断意义及鉴别诊断价值。方法对80...目的探讨孤立性纤维性肿瘤(solitary fibrous tumour,SFT)的临床病理特征及免疫组织化学标志物信号转导及转录激活因子6(signal transducers and activators of transcription6,STAT6)的临床病理诊断意义及鉴别诊断价值。方法对80例SFT进行回顾性研究.并复习相关文献资料,采用免疫组织化学EnVision法检测STAT6、CD34、CD99和bcl-2蛋白在SFT和其他各型软组织肿瘤中的表达情况,并分析其临床病理意义。结果STAT6在SFT和对照组软组织肿瘤中的阳性率分别为97.5%(78/80)和3.3%(3/90),两者之间的表达差异具有统计学意义(P〈0.05);在SFT中CD34、CD99和bcl-2的阳性率分别为88.8%(71/80)、76.3%(61/80)和75.0%(60/80),三者与STAT6的表达差异均具有统计学意义(P〈0.05)。STAT6在SFT中表达的灵敏度为97.5%(78/80),特异度为96.7%(87/90)。结论STAT6在SFT细胞核中的表达具有较高的灵敏度和特异度,远高于CD34、CD99和bcl-2这3种常用临床标志物,可作为临床诊断SFF的又一个有用标志物,具有重要的临床诊断和鉴别诊断意义。展开更多
OBJECTIVE: To clone and study the polymorphism within interleukin-4 (IL-4) proximal promoter of asthmatic children. METHODS: The IL-4 proximal promoter segments were amplified and selected by polymerase chain reaction...OBJECTIVE: To clone and study the polymorphism within interleukin-4 (IL-4) proximal promoter of asthmatic children. METHODS: The IL-4 proximal promoter segments were amplified and selected by polymerase chain reaction (PCR) and single strand conformation polymorphism (SSCP) with genomic DNA from ten healthy children and forty patients with dominantly allergic familial histories as templates. The selected PCR segments were cloned into recombinant plasmids pIL-4-Jx2. The PCR inserts were sequenced by dideoxy chain termination method. RESULTS: Seven aberrant bands were found in SSCP analysis from forty asthmatic patients. The sequencing results showed that four variant sites were found within or adjacent to the known IL-4 regulatory element. A C to A transversion located at -229 position was just within the positive regulatory element-I (PRE-I) in one patient. A C to T transition adjacent to the negative regulatory element-II (NRE-II) and an extra G adjacent to TATA box were found in two patients. A five base nucleotide deletion was found near signal transducers and activators of transcription-6 responsive element (STAT-6 RE) in one patient. CONCLUSION: There were polymorphisms within the IL-4 proximal promoter of allergic asthmatic patients and these polymorphisms might result in aberrant expression of IL-4 gene and asthma.展开更多
目的通过户尘螨(Dermatophagoides pteronyssinus)2类变应原Der p 2 T细胞表位融合肽对哮喘小鼠的特异性免疫治疗,探讨信号转导因子和转录活化因子6(signal transducer and activator of transcription factor 6,STAT6)的变化及其特异...目的通过户尘螨(Dermatophagoides pteronyssinus)2类变应原Der p 2 T细胞表位融合肽对哮喘小鼠的特异性免疫治疗,探讨信号转导因子和转录活化因子6(signal transducer and activator of transcription factor 6,STAT6)的变化及其特异性免疫治疗的作用机制。方法 30只小鼠用随机数表法分为哮喘组、Der p 2 T细胞表位融合肽免疫治疗组(简称免疫治疗组)和阴性对照组(PBS组),每组10只。哮喘组和免疫治疗组分别于第0、7、14天经小鼠腹腔注射100μl致敏液[含100μg/ml Der p2和2%Al(OH)3的PBS液],PBS组注射等量PBS液[含2%Al(OH)3]。哮喘组和免疫治疗组自第21天起,雾化吸入0.5μg/ml Der p 2致敏液,1次/d×30 min,连续7 d;PBS组雾化吸入等量PBS液。免疫治疗组在第25~27天雾化前30 min,经腹腔注射100μg/ml Der p 2 T细胞表位融合肽200μl,PBS组和哮喘组注射等量PBS液。末次雾化吸入24 h后处死小鼠,收集每组小鼠的支气管肺泡灌洗液(BALF),用ELISA检测BALF中白细胞介素-4(IL-4)、IL-13、γ干扰素(IFN-γ)水平。取肺组织提取肺组织全蛋白,蛋白质印记(Western blotting)检测肺组织全蛋白中STAT6和磷酸化STAT6(p-STAT6)的表达情况。组间样本的均数比较采用单因素方差分析。结果免疫治疗组小鼠的IFN-γ水平为(234.40±24.46)pg/ml,高于哮喘组的(155.80±20.53)pg/ml(P<0.01);免疫治疗组小鼠的IL-4和IL-13水平分别为(30.00±5.50)和(174.50±25.99)pg/ml,均低于哮喘组小鼠的(53.28±8.26)和(308.10±28.32)pg/ml(P<0.01)。免疫治疗组小鼠STAT6、p-STAT6的相对表达量分别为0.803±0.221和0.966±0.323,均低于哮喘组的1.669±0.296和1.735±0.298(P<0.01)。结论 Der p 2 T细胞表位融合肽可能通过抑制STAT6治疗哮喘组小鼠。展开更多
目的:分别构建信号转导与转录活化因子6(signal transducer and activator of transcription6,STAT6)过表达及RNA干扰(RNA interference,RNAi)慢病毒载体,研究STAT6基因表达对人结肠癌RKO细胞增殖和迁移的影响。方法:以人胚肾HEK293FT细...目的:分别构建信号转导与转录活化因子6(signal transducer and activator of transcription6,STAT6)过表达及RNA干扰(RNA interference,RNAi)慢病毒载体,研究STAT6基因表达对人结肠癌RKO细胞增殖和迁移的影响。方法:以人胚肾HEK293FT细胞cDNA为模板,PCR扩增STAT6基因的完整开放阅读框(open reading frame,ORF)片段,化学合成针对STAT6基因的RNAi靶向单链片段,通过pLVTHm慢病毒载体三质粒包装系统对以上2种片段进行慢病毒颗粒包装;再用病毒感染结肠癌RKO细胞,获得稳定表达STAT6-ORF和STAT6-RNAi的细胞株。RT-PCR和蛋白质印迹法检测稳定感染细胞株中STAT6基因的表达情况,CCK8法检测细胞活性的变化,Transwell实验检测细胞迁移能力的变化。结果:成功构建STAT6-ORF和STAT6-RNAi慢病毒表达载体,并获得稳定表达STAT6的相应RKO细胞株。与对照组细胞相比,STAT6-ORF转染组细胞的增殖速度加快不明显(P=0.609),细胞迁移能力显著增强(P<0.01);而STAT6-RNAi转染组的细胞活性显著降低(P<0.001),迁移能力显著下降(P<0.01)。结论:STAT6可能是促进结肠癌细胞增殖和迁移的重要转录因子。展开更多
文摘目的探讨孤立性纤维性肿瘤(solitary fibrous tumour,SFT)的临床病理特征及免疫组织化学标志物信号转导及转录激活因子6(signal transducers and activators of transcription6,STAT6)的临床病理诊断意义及鉴别诊断价值。方法对80例SFT进行回顾性研究.并复习相关文献资料,采用免疫组织化学EnVision法检测STAT6、CD34、CD99和bcl-2蛋白在SFT和其他各型软组织肿瘤中的表达情况,并分析其临床病理意义。结果STAT6在SFT和对照组软组织肿瘤中的阳性率分别为97.5%(78/80)和3.3%(3/90),两者之间的表达差异具有统计学意义(P〈0.05);在SFT中CD34、CD99和bcl-2的阳性率分别为88.8%(71/80)、76.3%(61/80)和75.0%(60/80),三者与STAT6的表达差异均具有统计学意义(P〈0.05)。STAT6在SFT中表达的灵敏度为97.5%(78/80),特异度为96.7%(87/90)。结论STAT6在SFT细胞核中的表达具有较高的灵敏度和特异度,远高于CD34、CD99和bcl-2这3种常用临床标志物,可作为临床诊断SFF的又一个有用标志物,具有重要的临床诊断和鉴别诊断意义。
文摘OBJECTIVE: To clone and study the polymorphism within interleukin-4 (IL-4) proximal promoter of asthmatic children. METHODS: The IL-4 proximal promoter segments were amplified and selected by polymerase chain reaction (PCR) and single strand conformation polymorphism (SSCP) with genomic DNA from ten healthy children and forty patients with dominantly allergic familial histories as templates. The selected PCR segments were cloned into recombinant plasmids pIL-4-Jx2. The PCR inserts were sequenced by dideoxy chain termination method. RESULTS: Seven aberrant bands were found in SSCP analysis from forty asthmatic patients. The sequencing results showed that four variant sites were found within or adjacent to the known IL-4 regulatory element. A C to A transversion located at -229 position was just within the positive regulatory element-I (PRE-I) in one patient. A C to T transition adjacent to the negative regulatory element-II (NRE-II) and an extra G adjacent to TATA box were found in two patients. A five base nucleotide deletion was found near signal transducers and activators of transcription-6 responsive element (STAT-6 RE) in one patient. CONCLUSION: There were polymorphisms within the IL-4 proximal promoter of allergic asthmatic patients and these polymorphisms might result in aberrant expression of IL-4 gene and asthma.
文摘目的通过户尘螨(Dermatophagoides pteronyssinus)2类变应原Der p 2 T细胞表位融合肽对哮喘小鼠的特异性免疫治疗,探讨信号转导因子和转录活化因子6(signal transducer and activator of transcription factor 6,STAT6)的变化及其特异性免疫治疗的作用机制。方法 30只小鼠用随机数表法分为哮喘组、Der p 2 T细胞表位融合肽免疫治疗组(简称免疫治疗组)和阴性对照组(PBS组),每组10只。哮喘组和免疫治疗组分别于第0、7、14天经小鼠腹腔注射100μl致敏液[含100μg/ml Der p2和2%Al(OH)3的PBS液],PBS组注射等量PBS液[含2%Al(OH)3]。哮喘组和免疫治疗组自第21天起,雾化吸入0.5μg/ml Der p 2致敏液,1次/d×30 min,连续7 d;PBS组雾化吸入等量PBS液。免疫治疗组在第25~27天雾化前30 min,经腹腔注射100μg/ml Der p 2 T细胞表位融合肽200μl,PBS组和哮喘组注射等量PBS液。末次雾化吸入24 h后处死小鼠,收集每组小鼠的支气管肺泡灌洗液(BALF),用ELISA检测BALF中白细胞介素-4(IL-4)、IL-13、γ干扰素(IFN-γ)水平。取肺组织提取肺组织全蛋白,蛋白质印记(Western blotting)检测肺组织全蛋白中STAT6和磷酸化STAT6(p-STAT6)的表达情况。组间样本的均数比较采用单因素方差分析。结果免疫治疗组小鼠的IFN-γ水平为(234.40±24.46)pg/ml,高于哮喘组的(155.80±20.53)pg/ml(P<0.01);免疫治疗组小鼠的IL-4和IL-13水平分别为(30.00±5.50)和(174.50±25.99)pg/ml,均低于哮喘组小鼠的(53.28±8.26)和(308.10±28.32)pg/ml(P<0.01)。免疫治疗组小鼠STAT6、p-STAT6的相对表达量分别为0.803±0.221和0.966±0.323,均低于哮喘组的1.669±0.296和1.735±0.298(P<0.01)。结论 Der p 2 T细胞表位融合肽可能通过抑制STAT6治疗哮喘组小鼠。
文摘目的:分别构建信号转导与转录活化因子6(signal transducer and activator of transcription6,STAT6)过表达及RNA干扰(RNA interference,RNAi)慢病毒载体,研究STAT6基因表达对人结肠癌RKO细胞增殖和迁移的影响。方法:以人胚肾HEK293FT细胞cDNA为模板,PCR扩增STAT6基因的完整开放阅读框(open reading frame,ORF)片段,化学合成针对STAT6基因的RNAi靶向单链片段,通过pLVTHm慢病毒载体三质粒包装系统对以上2种片段进行慢病毒颗粒包装;再用病毒感染结肠癌RKO细胞,获得稳定表达STAT6-ORF和STAT6-RNAi的细胞株。RT-PCR和蛋白质印迹法检测稳定感染细胞株中STAT6基因的表达情况,CCK8法检测细胞活性的变化,Transwell实验检测细胞迁移能力的变化。结果:成功构建STAT6-ORF和STAT6-RNAi慢病毒表达载体,并获得稳定表达STAT6的相应RKO细胞株。与对照组细胞相比,STAT6-ORF转染组细胞的增殖速度加快不明显(P=0.609),细胞迁移能力显著增强(P<0.01);而STAT6-RNAi转染组的细胞活性显著降低(P<0.001),迁移能力显著下降(P<0.01)。结论:STAT6可能是促进结肠癌细胞增殖和迁移的重要转录因子。