Novel multi-probe RNase protection assay set for detection of endotoxin associated receptors gene expression

Objective: To construct the multi-probe ribonuclease protection assay (RPA) template set to be used for detecting expression patterns of MD-2, TLR4, CD14 mRNAs in human peripheral blood mononuclear cells. Methods : The designed cDNA fragments of the three genes were generated by polymerase chain reaction (PCR)using specific primers and directionally cloned into EcoR I and Hind III sites of expression plasmid pSP72 containing the T7/ promoter, the linearized plasmids was used as template to synthesize anti-sense RNA probes. Then we extracted total RNA from peripheral blood mononuclear cells (PBMC) and detected the dynamic expression patterns of the three genes with RPA method. Results: The proper sequence and orientation of the template set were confirmed by sequencing and the template set was successfully used to assay TLR4, MD-2 and CD14 mRNAs in human PBMC. The results showed that the three detected genes decreased transiently 1-3 hours after 100 ng/ml LPS stimulation. Conclusions: These new RPA multi-probe set provided valuable tool for the simultaneous quantitative determination of expression of TLR4, CD14 and MD-2 mRNAs in both constitutive and inducible types.     

A review of Disrupted-In-Schizophrenia-1 (DISC1): neurodevelopment, cognition, and mental conditions.

Disrupted-In-Schizophrenia-1 (DISC1) is a promising candidate gene for schizophrenia (SZ) and bipolar disorder (BP), but its basic biology remains to be elucidated. Accumulating genetic evidence supports that DISC1 is associated with some aspects of cognitive functions relevant to SZ and BP. Here, we provide a summary of the current updates in biological studies of DISC1. Disrupted-In-Schizophrenia-1, preferentially expressed in the forebrain, has multiple isoforms with potential posttranslational modifications. Disrupted-In-Schizophrenia-1 protein occurs in multiple subcellular compartments, which include the centrosome, microtubule fractions, postsynaptic densities, actin cytoskeletal fractions, the mitochondria, and the nucleus. Recent studies have clarified that DISC1 mediates at least centrosome-dynein cascade and cyclic adenosine monophosphate (cAMP) signaling. Furthermore, both cytogenetic and cell biological studies consistently suggest that an overall loss of DISC1 function (either haploinsufficiency or dominant-negative, or both) may be associated with SZ and BP. On the basis of these findings, production of DISC1 genetically engineered mice is proposed as a promising animal model for SZ and BP. Several groups are currently generating DISC1 mice and starting to characterize them. In this review, the advantages and disadvantages of each animal model are discussed.     

3-氯丙二醇和2,3-氧丙醇合并灌喂九个疗程和停药120天后对大白鼠性腺器官的生化观察

本实验以合并3-氯丙二醇和2,3-氧丙醇(5+75mg/kg/d×2)给大鼠9个疗程,停药120天,共历程210天。观察其睾丸及附睾头、精囊某些生化成份的影响,其结果表明实验组之糖蛋白、RNA、DNA,含量有不同变化,停药120天未能完全恢复。停药120天后,乳酸脱氢酶活性及其同功酶酶谱的分析表明,能量的供能未能恢复到对照组的水平。从酶谱来看,药物所致的供能方式受损伤,因器官不同而有不同,并讨论了药物所致的不育,可能与能量供给有关。     

实时荧光定量PCR检测PML-RARα融合基因的临床应用研究

目的 利用PML-RARα融合基因作为标志物,应用实时荧光定量PCR技术,监测急性早幼粒细胞白血病(APL)微小残留病(minimal residual disease,MRD)患者体内病毒的状态,探讨预测APL复发风险的方法.方法 利用本实验室建立的定量检测APL患者PML-RARα融合基因的方法,对25例处于初诊、完全缓解(complete remission,CR)、复发等不同阶段的APL患者进行了PML-RARα融合基因的定量检测,并对其中6例患者的MRD状态进行了动态监测.结果 应用荧光定量PCR技术分析患者初诊、CR和复发状态的PML-RARα基因对数值(lg)水平,结果 显示有统计学意义(x2=6.847,P＜0.05);随访期患者的PML-RARα对数值(lg)水平变化较大:初诊时较高(-0.61±0.79),CR时下降(-1.31±0.62),复发时又出现上升(-0.57±0.44),提示若该患者在CR时的对数值呈现上升趋势,患者复发的机率大.结论 应用实时荧光定量(RQ)-PCR技术定量检测PML-RARα融合基因,对监测APL患者MRD状态具有临床适用性,随访期的MRD动态追踪监测具有预后价值.     

hMSH2、hMLHl在胃癌中的表达及其临床意义

目的:探讨错配修复基因hMSH2、hMLH1蛋白的表达与胃癌临床病理学特性之间的关系。方法:采用免疫组织化学方法检测40例胃癌及50例胃炎组织中hMSH2、hMLH1蛋白的表达情况,并研究其与胃癌临床病理之间的关系。结果:40例胃癌标本中,hMSH2减低表达率为35%,hMLH1蛋白降低表达率为72.5%;淋巴结转移阳性的胃癌中,hMSH2、hMLH1蛋白表达明显减低。结论:hMSH2、hMLH1蛋白可能与早期胃癌和胃癌淋巴结转移有关。     

刺五加对~(60)Co-γ射线照射后小鼠胸腺效应的实验研究

采用180只成年小白鼠(雌雄各半),其中168只经一次总剂量为4Gy的~(60)Co—γ射线照射,造成造血放射损伤,再从其中随机选出56只膜腔注射刺五加注射液作为实验用药组,其余小白鼠随机分为盐水对照组(56只),空白对照组(56只)及正常对照组(12只)。实验结果显示。实验用药组的胸腺细胞超微结构的恢复比同期对照组快,胸腺组织DNA含量比同期对照组高。因此,我们认为刺五加可促进辐射损伤后小白鼠胸腺细胞结构的恢复。     

高血压脑梗死患者血管紧张素转换酶基因多态性分析

目的 探讨血管紧张素转换酶（ACE）基因多态性与高血压脑梗死发病的关系。方法 采用聚合酶链反应技术（PCR），对158名健康成人和50例原发性高血压、90例高血压脑梗死患者ACE基因插入／缺失（I／D）多态性进行检测，并且非条件Logistic回归筛选出与高血压脑梗死发病相关的因素。结果 DD基因型、D等位基因频率高血压脑梗死组高于正常对照组（P＜0.01)和高血压组（P＜0.05)。发病年龄在60岁以上者，DD基因型、D等位基因频率高血压脑梗死组高于高血压组和正常对照组（P＜0.05、P＜0.01)；而60岁以下起病者，DD基因型、D等位基因频率高血压脑梗死组则与高血压组、正常对照组无差别（均P＞0.05)，而高血压组D等位基因频率高于正常对照组（P＜0.05)。ACE DD基因型是高血压脑梗死独立的危险因素，发现高血压时间是高血压脑梗死的保护因素。结论 ACE DD基因型携带者发生高血压脑梗死的危险性增高，早期发现及治疗高血压对降低高血压患者脑梗死发生有意义。     

Lack of prostanoid receptor involvement in ischemic acute renal failure in mice

Background. Thromboxane (TX) A₂ inhibition or prostaglardin (PGI₂) infusion prevents ischemic acute renal failure (ARF) in animal models. However, the pathophysiological roles of the prostanoid receptors in the development of ischemic ARF are not fully understood, partly because of the limited specificity of their inhibitors or antagonists. Methods. We investigated whether targeted disruption of the PGI₂ receptor (IP) or TXA₂ receptor (TP) genes conferred susceptibility to renal ischemic-reperfusion injury, using IP and TP knockout mice. Results. Serum creatinine concentration in TP knockout mice was not significantly different from that in wild-type controls. There were no significant histological differences between TP knockout and wild-type mice. Likewise, IP knockout mice showed no significant differences from the wild-type controls in regard to creatinine concentration or histological damage. Conclusions. Lack of TP or IP had no influence on postischemic ARF in mice, indicating that receptors for TXA₂ or PGI₂ may have minimal roles in the development of this mouse model of ischemic ARF. Received: July 5, 2001 / Accepted: April 8, 2002     

实验性D—半乳糖诱发动物白内障造模的探讨

用D—半乳糖餵饲、腹腔及球后注射诱发白内障造模,经裂隙灯检查结果表示,30％D—半乳糖餵饲大鼠造模是一种简单有效的方法。     

重组跨膜型人CD55分子在小鼠NIH3T3细胞上的表达及其补体溶破保护功能的研究

目的 :在小鼠NIH3T3细胞转染表达人天然GPI锚固型CD5 5和重组跨膜型CD5 5 TM分子 ,观察比较它们对人补体溶破异源细胞的抑制功能。方法 :将带有CD5 5cDNA、CD5 5 TMcDNA的重组逆病毒表达质粒CD5 5 pLXSN、CD5 5TM pLXSN经脂质体法转染PA317细胞 ,用病毒上清感染小鼠成纤维母细胞NIH3T3。经G418加压筛选 ,利用FACS检测获得表达CD5 5和CD5 5 TM分子的阳性细胞克隆 ,通过MTT比色法比较两种分子对人血清补体溶破细胞的抑制功能有无差别。结果 :细胞转染筛选获得多个表达跨膜型人CD5 5分子的NIH3T3细胞克隆 ,补体杀伤试验证实其具有抑制人补体溶破的功能 ,且两种分子的补体抑制功能无明显差异。结论 :成功地建立了稳定表达天然CD5 5、跨膜型CD5 5分子的小鼠NIH3T3细胞 ,证实其表达的GPI型CD5 5分子和CD5 5TM分子均具有抑制人补体溶破细胞的功能 ,为进一步探讨应用跨膜型的CD5 5分子对PNH进行基因治疗奠定了基础。