老年大鼠肺成纤维细胞表型改变和转化生长因子-β1水平变化

目的 对比观察老年大鼠和成年大鼠肺脏成纤维细胞表型的改变和转化生长因子(TGF)-β1水平的变化,寻找肺间质纤维化发病率随年龄增长而增高的可能机制.方法 免疫组化法测定大鼠肺组织内α-平滑肌肌动弹白(α-SMA)含量,观察成纤维细胞表型的改变.ELISA法测定TGF-β1蛋白水平.荧光定量PCR(realtime PCR)技术测定TGF-β1 mRNA表达量的变化.结果 老年大鼠肺脏较成年大鼠肺脏肌成纤维细胞比例增加(P＜0.01),TGF-β1蛋白水平升高[分别为(999.54±246.11)pg/g和(755.7±160.38)pg/g](P＜0.05),TGF-β1 mRNA(P＜0.01)表达水平降低.结论 老年大鼠肺脏肌成纤维细胞比例增加和TGF-β1蛋白水平升高可以构成肺间质纤维化随年龄增长发病率增高的基础,老化肺脏内TGF-β1水平升高是受到mRNA转录后调控机制的影响.     

为过继性免疫治疗培养淋巴细胞时的细胞因子作用和基因表达特征

在过继免疫性细胞培养时需要加入不同的细胞因子。本研究旨在比较不同细胞因子及EBV抗原肽联合细胞因子刺激淋巴细胞后淋巴细胞分化方向和相关的基因表达变化特征。分别用不同细胞因子及EBV抗原肽联合细胞因子刺激淋巴细胞,在培养的当天和第1、3、7、10天,用流式细胞术检测各组细胞中CD3+(总T细胞)、CD3+CD4+(辅助T细胞)、CD3+CD8+(细胞毒性T细胞)、CD3+CD8+CD45RO+(记忆型T细胞)、CD3+CD8+CD45RA+(初始型T细胞)、CD3+CD30+(Th2辅助细胞)、CD19+(B细胞)、CD56+(NK细胞)、CD4+CD25+(初始调节T细胞)、CD4+CD25+FOXP3+(精确调节T细胞)在培养前后总细胞中的百分比变化;用RT-PCR技术检测管家基因mad1、pten和辅助T细胞转录调控基因t-bet(Th1)、gata3(Th2)、细胞因子ifn-γ(Th1)、il-4(Th2)基因表达量。结果表明:EBV多肽组CTL细胞成为优势细胞,临床治疗有确切疗效;比较加入EBV多肽组和不同细胞因子培养组结果显示,EBV抗原肽可以更有效刺激CTL生成,ifn-γ基因表达量明显增加;辅...     

钙化血管平滑肌细胞肾上腺髓质素及其受体系统的基因表达上调

探讨钙化的血管平滑肌细胞肾上腺髓质素生成和肾上腺髓质素受体系统一降钙素受体样受体和受体活性修饰蛋白基因表达的改变及其病理意义。采用β-甘油磷酸盐诱导培养的大鼠血管平滑肌细胞钙化;放射免疫法测定血管平滑肌细胞分泌的肾上腺髓质素含量;半定量逆转录聚合酶链反应测定细胞肾上腺髓质素、降钙素受体样受体和受体活性修饰蛋白的mRNA水平;原子吸收分光光度计测定细胞钙含量;碱性磷酸酶试剂盒测定血管平滑肌细胞碱性磷酸酶活性;β液体闪烁计数仪测定45Ca2+放射活性。结果发现,与非钙化血管平滑肌细胞比较,钙化血管平滑肌细胞内钙含量、45Ca2+摄入及碱性磷酸酶活性分别增加118％、174％和7倍(P<0.01);钙化细胞肾上腺髓质素分泌量增高99％(P<0.01),肾上腺髓质素、降钙素受体样受体、受体活性修饰蛋白2和3的mRNA水平分别增加78％、93.7％、91.8％和109.5％(P均<0.01)。肾上腺髓质素与降钙素受体样受体、受体活性修饰蛋白2和3的mRNA水平呈正相关,其相关系数分别为0.83、0.92和0.93(P均<0.01)。结果提示,血管平滑肌细胞肾上腺髓质素 旁/自分泌功能改变可能参与血管钙化的调节过程。     

尾加压素Ⅱ促进大鼠主动脉合成和分泌内皮素1的机制研究

目的 研究尾加压素Ⅱ刺激大鼠主动脉组织产生和分泌内皮素1的作用及其细胞内信号机制.方法 将大鼠主动脉组织薄片和不同浓度尾加压素Ⅱ(10-10～10-7 mol/L)共孵育3 h或6 h,采用放射免疫法测定组织和孵育液中内皮素1含量;向孵育液中加入不同阻断剂,观察对尾加压素Ⅱ诱导内皮素1合成效应的影响,初步探讨尾加压素Ⅱ作用的细胞内机制.结果 尾加压素Ⅱ明显刺激内皮素1的分泌(孵育液含量)和产生(孵育液和组织内皮素1含量总和),呈现时间和浓度依赖性(10-10～10-7 mol/L).孵育3 h后,尾加压素Ⅱ(10-8 mol/L)组内皮素1分泌量较对照组高1.46倍 (P＜0.01),产生总量较对照组高87.9% (P＜0.01);孵育6 h后,尾加压素Ⅱ刺激组(浓度分别为10-10、10-9、10-8 mol/L和10-7 mol/L)内皮素1分泌量分别较对照组增加59.2%,108.0%,159.6%和178.0%,产生总量分别较对照组增加40.6%,68.4%,103.1% 和105.7%(P＜0.01).尾加压素Ⅱ促进内皮素1产生的作用能分别被Ca2 通道阻断剂尼卡地平、蛋白激酶C阻断剂H7、丝裂素活化蛋白激酶抑制剂PD98059、mRNA抑制剂放线菌素D以及蛋白合成抑制剂环磷酰胺所抑制,其中对内皮素1分泌作用的抑制率分别为34.1%,24.5%,32.2%,32.1%和27.6%(P＜0.01),对内皮素1产生总量的抑制率分别为33.5%,31.5%,25.8%,28.0%和36.8%(P＜0.01).结论 尾加压素Ⅱ能够促进主动脉组织合成和分泌内皮素1,该作用可通过Ca2 通道、蛋白激酶C以及丝裂素活化蛋白激酶途径来实现,并提示尾加压素Ⅱ的缩血管等效应有可能通过促进内皮素1的产生来实现.     

IL-10基因单核苷酸多态性与急性淋巴细胞白血病易感性的相关性研究

Objective To observe the relationship of IL-10 gene single nucleotide polymorphism and the susceptibility to ALL. Methods The bone marrow and peripheral blood samples from 115 ALL patients and 323 healthy controls were collected in Peking University First Hospital and Beijing Dao-pei Hospital from January 2007 to December 2009. The DNA were extracted from all samples. The primers of -819C/T and -592A/C in the promoter region of IL-10 gene were designed for the PCR. The restrictive fragment length polymorphism of IL-10 gene was analyzed by using restrictive enzyme Msl Ⅰ and HpyCH4 Ⅲ.Sequencing was done in part of these samples to confirm the results of PCR. The differences of genotypes and allele ratio of -819 and -592 sites were analyzed between the ALL patients and healthy controls. Real-time quantitative PCR was performed to detect the EB virus (EBV) infection and the expression of BCR/ABL fusion gene. The differences of genotypes and allele ratio of -819 and -592 sites were analyzed between the positive and negative group. Results The genotype ratios of -819CC, -819TT, - 819CT, -592AA,- 592CC and - 592AC were 14. 8% ( 17/115 ), 45.2% ( 52/115 ), 40. 0% ( 46/115 ), 43.5% ( 50/115 ),16. 5% ( 19/115 ), 40. 0% ( 46/115 ) in ALL patients, and were 9. 9% ( 32/323 ), 16. 4% ( 53/323 ),73.7% ( 238/323 ), 11.8% ( 38/323 ), 15.5% ( 50/323 ), 72. 8% ( 235/323 ) in the healthy controls,respectively. The genotypes of -819 and -592 sites had statistically significant differences between the two groups(x2 values were 46.000 and 54.550, all P ＜ 0. 05 ). The allele ratio of -819T and -592A were (65.2%, 150/230) and (63.5%, 146/230) in ALL patients, while they were 53.5% (344/646) and 48. 1% (311/646)in the healthy controls. There were statistically significant differences between the two groups (x2 values were 9. 877 and 15.986, all P ＜ 0. 05 ). The EBV DNA were detected in 42 ALL patients,among which 22 were positive and 20 were negative. The genotype ratios of -819CC, -819TT, -819CT,-592AA, - 592CC, - 592AC in EBV positive group were 9. 1% ( 2/22 ), 40. 9% ( 9/22 ), 50. 0%(11/22) ,31.8% ( 7/22 ), 13.6% ( 3/22 ), 54. 5% ( 12/22 ), while they were 35.0% ( 7/20 ), 45.0%(9/20) ,20. 0% (4/20) ,35.0% (7/20) ,45.0% (9/20) ,20. 0% (4/20) in the EBV negative group. The genotypes of -819 and -592 sites showed no statistical differences between the two groups( all P ＞ 0. 05 ).The BCR/ABL fusion gene were detected in 36 ALL patients, among which 20 were positive and 16 were negative. The genotype ratios of - 819CC, - 819TT, - 819CT, - 592AA, - 592CC, - 592AC in BCR/ABL positive group were 0% (0/20) ,45.0% (9/20) ,55.0% ( 11/20), 45. 0% (9/20) ,5.0% (1/20) ,50. 0%( 10/20), while they were 18. 8% ( 3/16 ), 50. 0% ( 8/16), 31.3% ( 5/16 ), 50. 0% ( 8/16 ), 18. 8%(3/16), 31.3 % (5/16)in the BCR/ABL negative group. The genotypes of -819 and -592 sites showed no statistical differences between the two groups ( all P ＞ 0. 05 ). Conclusion The population with - 819TT and - 592AA genotype of IL-10 gene shows susceptibility to ALL.     

临床常见镰刀菌rDNA ITS序列分析

镰刀菌(Fusarium spp)通常被认为是某些植物的致病菌和污染菌。近年来随着广谱抗生素、类固醇激素的大量应用,器官移植、介入疗法的不断开展,特别是免疫缺陷疾病的增多,镰刀菌引起的人类感染先后有报道[1]。临床上镰刀菌常可引起角膜炎[2],也可见于皮肤感染[3]、关节炎[4]等,常     

恶性血液病患者mdr1基因启动子区甲基化状态及其与表达的关系

为了探讨多药耐药 (mdr1)基因启动子区的甲基化状态及其与表达的关系 ,采用甲基化敏感的HpaⅡ酶切结合竞争性定量PCR检测 5 4例急性白血病 (AL)和 9例多发性骨髓瘤 (MM)患者mdr1基因启动子区位于转录起始点上游 - 110和 - 5 0bp处两个CCGG位点 (I区和Ⅱ区 )的甲基化率 ;半定量RT PCR检测mdr1基因的表达水平。结果显示I区、Ⅱ区及总甲基化率均与表达呈负相关 ,I区比Ⅱ区相关密切 (r分别为 - 0 .6 4和 - 0 .4 0 )。低甲基化组(n=36 )mdr1高表达率显著增高 (P <0 .0 0 1)。与化疗敏感组 (n =8)相比 ,耐药组 (n=16 )I区 (P =0 0 5 )、Ⅱ区 (P <0 .0 5 )和总甲基化率 (P <0 .0 5 )均减低。与未化疗组 (n =36 )相比 ,化疗后组 (n =14 )I区和总甲基化率均减低 (P <0 .0 5 ) ,Ⅱ区甲基化率也减低 ,但无统计学意义 (P >0 .0 5 )。化疗后组随甲基化率减低 ,mdr1表达升高 ,但尚无统计学意义 (P =0 .0 6 )。结论 :AL和MM患者骨髓mdr1基因表达水平与基因转录起始点上游 - 110和- 5 0处两个CCGG位点的甲基化程度呈负相关 ,且与 - 110处关系更密切。化疗后及耐药病人mdr1基因甲基化水平相对降低。化疗后mdr1基因表达增高与其甲基化水平降低有关。     

副肿瘤性天疱疮患者免疫荧光与免疫印迹检测研究

目的 研究副肿瘤性天疱疮患者的免疫学特点。方法 采用免疫荧光和免疫印迹方法检测4例副肿瘤性天疱疮患者肿瘤切除前、后的血清。结果 以鼠膀胱为底物行间接免疫荧光示IgG和C3棘细胞间沉积，肿瘤切除后抗体滴度较术前下降，且与病情的好转成正比。比正常人皮肤及大鼠舌、食管及猴舌为底物行间接免疫荧光阳性；以大鼠支气管、心肌、肝脏、肾脏等组织为底物行间接免疫荧光阴性。免疫印迹示患者血清可识别人角质形成细胞提取物中的210000和190000抗原。结论 以鼠膀胱为底物的间接免疫荧光可作为副肿瘤性天疱疮的过筛试验，且可通过抗体滴度的改变监测病情的变化。副肿瘤性天疱疮更易累及粘膜部位上皮组织。免疫印迹结果可确诊4例患者为副肿瘤性天疱疮。