重组人肝再生增强因子抑制实验性肝纤维化明胶酶A基因表达

目的　了解重组人肝再生增强因子 (hALR)对实验性肝纤维化明胶酶A(MMP2 )基因表达的影响。方法　建立CCl4中毒性及人血白蛋白免疫损伤性两种大鼠肝纤维化模型 ,在造模的同时给予不同剂量 (10 ,5 0 μg·kg-1·d-1)的hALR。在不同的时间点留取大鼠肝组织标本 ,提取总RNA ,用逆转录定量聚合酶链反应 (RT PCR)测定MMP2 的基因表达水平。结果　在两种模型中两个剂量hALR预防组大鼠肝组织MMP2 的基因表达水平在模型形成的不同阶段均明显低于模型组 ;高剂量hALR组大鼠肝组织MMP2 的基因表达水平均明显低于低剂量组。结论　重组人肝再生增强因子可能有抑制大鼠实验性肝纤维化MMP2 基因表达的作用     

Expression of gastric cancer—associated MG7 antigen in gastric cancer,precancerous lesions and H.pylori—associated gastric diseases

AIM: To investigate the relationship between the antigen MG7 antigen expression and gastric cancer as well as precancerous condition; to study the relationship between the MG7 antigen expression and H. pyloriinfection in benign gastric lesions in order to find out the effect of H. pylori infection on the process of gastric cancer development.METHODS: The level of MG7 antigen expression was determined by immunohistochemical method in 383 gastric biopsied materials. The intestinal metaplasia was determined by histochemistry method. The H. pyloriinfection was determined by HE stain, PCR and ELISA in 291 specimens, among which only 34 cases of H. pylori-associated gastric lesions were followed up.RESULTS: The positive rate of MG7 expression in normal gastric mucosa, intestinal metaplasia, dysplasia and gastric cancer increased gradually in ascending order (P＜0.01). The positive rate of MG7 antigen expression in type Ⅲ intestinal metaplasia of gastric mucosa was higher than that of type Ⅰand Ⅱ intestinal metaplasia, being highly significant (P＜0.05).The positive rate of MG7 antigen expression in superficial gastritis, atrophic gastritis and gastric cancer increased gradually (11.9 %, 64.8 %, 91.2 %, P＜0.01). There was no significant difference between H.pylori-negative and H. pyloripositive intestinal metaplasia, atrophic gastritis and dysplasia of gastric epithelium in the positive rate of MG7 antigen expression. There was no expression of MG7 antigen in H. pylori-negative superficial gastritis. The positive rate of MG7 expression in H. pylori-positive superficial gastritis was 20.5 %, and the difference between them was significant (P＜0.05). During following up, one of the three H. pylori negative cases turned positive again, and its MG7 antigen expression turned to be stronger correspondingly. 3 of 31 H. pyloripositive cases were detected as early gastric cancer, among which one with "+++" MG7 antigen expression was diminished after H. pylori eradication.CONCLUSION: MG7 antigen expression is highly specific in gastric cancer and can be used as a good marker for screening of gastric cancer; type Ⅲ intestinal metaplasia, atrophic gastritis and dysplasia should be followed up and MG7 antigen expression has high clinical value in the dynamic follow-up study; although the positive -MG7 in positiveH. pylorisuperficial gastritis show benign morphology in features, there is still the potential risk of developing into gastric cancer, hence special attention should be paid to those showing increasing MG7 antigen expression.     

胰腺癌胆囊收缩素受体蛋白表达的研究

目的探讨胆囊收缩素受体在正常胰腺组织、胰腺癌组织、胰腺癌细胞株SW1990中的表达，以明确胆囊收缩素受体与胰腺癌的关系。方法应用免疫组织化学法和免疫细胞化学法分别检测正常胰腺组织、胰腺癌组织、胰腺癌细胞株SW1990中胆囊收缩素受体A、B亚型的表达。结果在正常胰腺组织中缺乏胆囊收缩素受体A、B亚型的表达；在胰腺癌组织、人胰腺癌细胞株SW1990中也不表达胆囊收缩素受体A亚型，但可见胆囊收缩素受体B亚型的表达；胆囊收缩素受体在癌细胞株SW1990中的表达主要位于细胞膜上，细胞质内也可见。结论胆囊收缩素受体B在胰腺癌组织、腺癌细胞株SW1990中表达；胆囊收缩素受体B亚型主要位于细胞膜上；胆囊收缩素受体B亚型在胰腺癌细胞生长中可能发挥重要作用。     

钙、维生素D缺乏大鼠长骨成骨细胞的维生素D受体水平

对正常、钙缺乏和维生素D缺乏的大鼠 ,观察其体外培养的长骨成骨细胞的维生素D受体最大结合容量 ,结果显示维生素D缺乏组显著低于正常组 (P <0 .0 1)。     

脑缺血的基因表达和基因治疗

卒中后,在梗死区周边存在一可逆的半暗带,利用神经保护因子或通过改变半暗带基因表达可保护半暗带,阻止脑组织缺血性损伤的发生和发展。文章对脑缺血基因治疗的原理、基因表达、实验方法和治疗等进行了综述。     

联合应用激光微切和实时定量RT-PCR检测单个胰岛的基因表达

在显微镜下用紫外激光微切机将单个胰岛从胰腺切片中切下，提取RNA后逆转录成cDNA并在实时定量RY—PCR中得到有效的扩增，其表达量与细胞数量成正比。     

甲状腺素对仔鼠脑NAPOR基因表达的影响

目的研究甲状腺素对仔鼠脑成纤维母细胞瘤凋亡相关的RNA结合蛋白(neuroblastoma apoptosis-related RNA-binding protein,NAPOR)基因表达的影响。方法以丙基硫氧嘧啶灌胃复制孕鼠甲状腺功能低下模型,采用逆转录-聚合酶链反应检测仔鼠出生后第1、5、10天仔鼠皮层NAPOR的表达,年龄匹配的正常仔鼠为对照组。结果NAPOR在甲状腺功能低下孕鼠所产仔鼠表达均高于正常对照组;在出生后一段时期内,随着鼠龄增长表达降低。结论转录后水平的调节机制可能参与甲状腺素对脑基因表达的影响。     

重症肌无力患者胸腺自身免疫相关基因表达的研究

目的探讨MG患者和正常对照者的胸腺组织炎症反应与自身免疫性疾病相关基因的表达情况。方法取MG患者（MG组）和正常对照者（对照组）的胸腺组织标本，提取总RNA，反转录合成cDNA后，体外转录合成生物素标记的cRNA与基因芯片进行杂交，通过化学发光法检测基因表达，比较两组胸腺组织基因表达的差异。结果MG组与对照组比较，有61条基因存在显著性差异，其中表达上调33条，下调28条，这些基因包括炎症相关趋化因子基因、细胞因子及其受体基因、与细胞因子产生与代谢有关的基因、细胞因子及其受体相互作用相关的基因、炎症反应相关基因以及体液免疫相关基因等。结论芯片筛选MG患者胸腺自身免疫相关基因表达与正常对照组存在显著差异。     

E-cad基因表达与胃癌发生及预后的关系研究

为探讨上皮钙粘附蛋白（E-cad)基因表达与胃癌发生发展及预后的关系，应用免疫组织化学方法检测了65例胃癌，25例胃癌前病变患者及20例胃粘膜正常者标本中的E-cad表达。结果显示，胃癌E-cad异常表达率（53．85％）显著高于胃癌前病变（24．0％），E-cad表达异常与胃癌的临床分期，分化程度，浸润深度及淋巴结转移密切相关，E-cad表达正常胃癌患者的3年，5年生存率显著高于E-cad表达异常者（P＜0．05）。提示E-cad基因表达与胃癌发生发展密切相关，检测E-cad表达有助于胃癌的早期诊断及转移潜能与预后的判断。     

十二指肠溃疡伴Hp~ 胃窦炎时胃窦生长抑素含量与mRNA表达

目的探讨十二指肠溃疡（DU）伴幽门螺杆菌（Hp）相关性胃窦炎时胃实生长抑素（SS）含量与mRNA表达方法采用放免法测定26例活动期DU（Hp检查均阳性）及24例非溃疡对照组（Hp检查6例阳性）胃窦粘膜组织SS含量，应用免疫组织化学方法检查D细胞的数量SSmRNA基因表达采用Northernblot和斑点杂交方法分析测量结果活动期DU26例，胃窦粘膜湿重组织SS含量为266ng／g±56ng／g±56ng／g，非溃疡对照组胃窦粘膜SS含量为335ng／g±110ng／g，两者相比差异非常显著（P＜0．01）活动期DU胃窦粘膜D细胞计数为36±13／mm2，明显少于非溃疡对照组59±42／mm2（P＜0．01）活动期DuSSmRNA水平（A）为0．52±0．11，较非溃疡对照组3．26±0．84显著降低（P＜0．01）．结论Hp感染引起中重度胃窦炎导致胃窦粘膜D细胞数量减少，同时SSmRNA基因转录及合成功能降抵，粘膜组织中SS含量减低，进一步可导致DU的发生．