医院信息中心机房改造工程实践

医院信息中心机房的服务器迁移是一项艰巨的高风险工作。本文介绍了我院通过前期周密地规划并制定详细的计划,在基本不影响医院正常业务的运行情况下,采用流程化的迁移方式,顺利地完成服务器的迁移及清洁的工作流程。     

雷公藤红素对人肺癌A549细胞增殖活性及能量代谢的影响

目的 探究雷公藤红素对人肺癌细胞（A549）的增殖活性以及能量代谢的影响。方法 噻唑蓝(MTT)法和生长曲线检测雷公藤红素对细胞的增殖抑制情况;HE染色观察细胞形态变化;分光光度法测定糖酵解途径中己糖激酶（HK）、丙酮酸激酶（PK）、乳酸脱氢酶（LDH）活力和三羧酸循环中琥珀酸脱氢酶（SDH）活力及能量代谢终产物ATP的含量。结果 雷公藤红素对A549细胞有增殖抑制作用,浓度在2 μg?mL^-1时,对A549细胞的抑制率达到62.71%,远远大于阳性药组5-FU的抑制率;生长曲线结果显示,雷公藤红素作用第4天细胞浓度最低,第6天细胞抑制程度最明显;HE结果表明雷公藤红素处理48 h后,细胞形态变圆,体积缩小,核深染且颜色变深;试剂盒检测结果显示,雷公藤红素非常显著的降低乳酸脱氢酶酶活力（P<0.01）,显著降低琥珀酸脱氢酶活力和ATP含量均显著降低(P<0.05),但对己糖激酶和丙酮酸激酶无明显作用。结论 雷公藤红素能够显著降低人肺癌A549细胞中乳酸脱氢酶和琥珀酸脱氢酶的活力,干扰能量代谢,抑制能量ATP生成,达到抑制A549细胞增殖的作用。     

Repurposing antimycotic ciclopirox olamine as a promising anti-ischemic stroke agent

Ischemic stroke is a severe disorder resulting from acute cerebral thrombosis. Here we demonstrated that post-ischemic treatment with ciclopirox olamine (CPX), a potent antifungal clinical drug, alleviated brain infarction, neurological deficits and brain edema in a classic rat model of ischemic stroke. Single dose post-ischemic administration of CPX provided a long-lasting neuroprotective effect, which can be further enhanced by multiple doses administration of CPX. CPX also effectively reversed ischemia-induced neuronal loss, glial activation as well as blood–brain barrier (BBB) damage. Employing quantitative phosphoproteomic analysis, 130 phosphosites in 122 proteins were identified to be significantly regulated by CPX treatment in oxygen glucose deprivation (OGD)-exposed SH-SY5Y cells, which revealed that phosphokinases and cell cycle-related phosphoproteins were largely influenced. Subsequently, we demonstrated that CPX markedly enhanced the AKT (protein kinase B, PKB/AKT) and GSK3β (glycogen synthase kinase 3β) phosphorylation in OGD-exposed SH-SY5Y cells, and regulated the cell cycle progression and nitric oxide (NO) release in lipopolysaccharide (LPS)-induced BV-2 cells, which may contribute to its ameliorative effects against ischemia-associated neuronal death and microglial inflammation. Our study suggests that CPX could be a promising compound to reduce multiple ischemic injuries; however, further studies will be needed to clarify the molecular mechanisms involved.     

siRNA下调c-myc的表达对喉癌Hep-2细胞周期的影响

目的利用RNAi技术特异性的抑制c-myc的表达,探讨在喉癌细胞中将c-myc作为基因治疗靶点的价值。方法免疫细胞化学法检测Hep-2细胞中c-myc蛋白的表达;利用RAN干扰技术将c-myc siRNA转染到喉癌Hep-2细胞中,使用Western Blotting的方法检测c-myc蛋白的表达,RT-PCR的方法检测c-myc mR-NA的表达;流式细胞仪检测c-myc siRNA与5-Fu单独或联合应用,对喉癌细胞周期的影响。结果 c-myc蛋白在Hep-2细胞中强表达;在转染c-myc siRNA后的喉癌Hep-2细胞中,c-myc蛋白和mRNA的表达水平逐渐下调;同时在转染c-myc siRNA后,G0/G1期的细胞开始增加,同时S期的细胞逐渐减少;当转染c-mycsiRNA细胞联合使用5-Fu时,G0/G1期的细胞明显增加,同时S期的细胞明显减少。结论 c-myc siRNA可以特异性的下调c-myc的表达,抑制喉癌细胞的增殖,增加细胞对化疗药的敏感性,表明c-myc或许可以成为喉癌基因治疗中一个重要的分子靶点。     

牛蒡子苷元对人食管癌细胞增殖细胞核抗原表达及细胞周期影响的研究

目的 观察牛蒡子苷元(arctigenin ARG)对体外培养的人食管癌细胞(esophageal cancer-1 cells,EC-1)增殖和增殖细胞核抗原(Proliferating Cell Nuclear Antigen,PCNA)表达及细胞周期的影响.方法 将不同浓度的ARG作用于EC-1,噻唑蓝(methyl thiazolyl tetrazolium M1Tr)实验检测细胞增殖抑制率、流式细胞术测定细胞周期变化,免疫组织化学法测定PCNA表达水平.结果 与对照组比较,ARG对EC-1细胞生长有抑制作用,随着时间/浓度的增加抑制作用逐渐增强(P<0.05);牛蒡子苷元可抑制EC-1由G0/G1向S期转换,G0/G1期细胞百分率较对照组显著增加,S期细胞百分率显著降低;随ARG浓度增加EC-1内PCNA表达水平逐渐降低.结论 ARG有抑制EC-1增殖,下调EC-1内PCNA表达水平,阻滞细胞周期的作用.     

Aberrant oligodendroglial LDL receptor orchestrates demyelination in chronic cerebral ischemia

Oligodendrocytes express low-density lipoprotein receptor (LDLR) to endocytose cholesterol for the maintenance of adulthood myelination. However, the potential role of LDLR in chronic cerebral ischemia–related demyelination remains unclear. We used bilateral carotid artery stenosis (BCAS) to induce sustained cerebral ischemia in mice. This hypoxic-ischemic injury caused a remarkable decrease in oligodendroglial LDLR, with impaired oligodendroglial differentiation and survival. Oligodendroglial cholesterol levels, however, remained unchanged. Mouse miR-344e-3p and the human homolog miR-410-3p, 2 miRNAs directly targeting Ldlr, were identified in experimental and clinical leukoaraiosis and were thus implicated in the LDLR reduction. Lentiviral delivery of LDLR ameliorated demyelination following chronic cerebral ischemia. By contrast, Ldlr^–/– mice displayed inadequate myelination in the corpus callosum. Ldlr^–/– oligodendrocyte progenitor cells (OPCs) exhibited reduced ability to differentiate and myelinate axons in vitro. Transplantation with Ldlr^–/– OPCs could not rescue the BCAS-induced demyelination. Such LDLR-dependent myelin restoration might involve a physical interaction of the Asn-Pro-Val-Tyr (NPVY) motif with the phosphotyrosine binding domain of Shc, which subsequently activated the MEK/ERK pathway. Together, our findings demonstrate that the aberrant oligodendroglial LDLR in chronic cerebral ischemia impairs myelination through intracellular signal transduction. Preservation of oligodendroglial LDLR may provide a promising approach to treat ischemic demyelination.     

IQGAP1在肺癌中的表达及其临床意义

目的探讨肺癌中支架蛋白IQGAP1的蛋白表达水平,及IQGAP1对肺癌细胞运动侵袭能力的影响。方法 RT-PCR检测IQGAP1mRNA的表达,免疫组织化学SABC法及Western blot检测IQ-GAP1蛋白的表达,并采用Transwell实验探讨IQGAP1蛋白促进侵袭转移的作用机制。结果研究发现其在肺癌组织存在高表达,IQGAP1蛋白可以通过提高肺癌细胞的运动能力促进肺癌的侵袭转移。结论 IQGAP1与肺癌密切相关,可能在肺癌的侵袭和转移中起重要做用。     

LRRC1通过DLG1/YAP信号通路促进肝癌细胞增殖的研究

目的 研究富含亮氨酸的重复序列蛋白1(LRRC1)通过巨盘状蛋白1(DLG1)/Yes相关蛋白(YAP)信号通路调节肝癌细胞增殖的机制。方法 在原发性肝细胞癌患者的癌灶组织及配对癌旁组织中,检测LRRC1的表达水平。使用小干扰RNA(siRNA)抑制HepG2及Huh7中LRRC1的表达后,检测细胞增殖能力及YAP、细胞周期蛋白D1(Cyclin D1)和细胞周期蛋白依赖性激酶4(CDK4)表达水平。通过共聚焦显微镜,定位HepG2细胞中LRRC1与DLG1分布。结果 肝细胞癌患者癌灶中LRRC1表达量较癌旁组织升高。siRNA 抑制HepG2及Huh7细胞中LRRC1基因表达后,细胞增殖能力受到抑制,YAP、Cyclin D1及CDK4表达水平下降。镜下发现HepG2细胞中LRRC1与DLG1均主要分布于细胞膜内侧面,两者分布位置高度重叠。结论 LRRC1通过DLG1/YAP信号通路调控细胞周期,促进肝癌细胞增殖。     

miR-21在脂多糖诱导的人鼻黏膜上皮细胞中表达变化及作用机制

目的 探讨微RNA-21（miR-21）在脂多糖诱导的人鼻黏膜上皮细胞（HNEpC）中表达变化及可能的作用机制。方法 应用脂多糖诱导建立HNEpC炎症反应细胞模型,分别应用荧光定量PCR（qRT-PCR）和蛋白免疫印迹法检测炎症细胞模型建立前后miR-21和磷酸酶及张力蛋白同源物 （PTEN）蛋白的表达水平变化。取脂多糖诱导的HNEpC细胞,分为miR-21抑制物组和阴性对照组,应用脂质体转染法分别将miR-21抑制物和阴性对照物转染入2组HNEpC细胞,比较转染后2组细胞中miR-21和PTEN蛋白的表达、细胞增殖活性和凋亡率以及细胞上清液中TNF-α、IL-1β、IL-6和IL-10的水平。结果 脂多糖诱导的HNEpC细胞中miR-21表达水平增高（P < 0.05）,PTEN蛋白的表达水平降低（P < 0.05）。miR-21抑制物组细胞中miR-21表达水平低于阴性对照组（P < 0.05）,转染后24、48、72 h后的吸光度值均低于阴性对照组（P均 < 0.05）,凋亡率高于阴性对照组（P < 0.05）,并且细胞上清液中TNF-α、IL-1β及IL-6水平均低于阴性对照组（P均 < 0.05）,IL-10水平高于阴性对照组（P < 0.05）,细胞中PTEN蛋白的表达水平高于阴性对照组（P < 0.05）。结论 miR-21在脂多糖诱导的HNEpC炎症反应细胞模型中表达升高,抑制miR-21可显著抑制脂多糖诱导的HNEpC细胞的增殖活性和炎症反应,同时促进其凋亡,其机制可能与其对PTEN基因的调控有关。