Identification and characterization of a high-affinity granulocyte- macrophage colony-stimulating factor receptor on primary rat oligodendrocytes

We previously showed the presence of receptors for granulocyte- macrophage colony-stimulating factor (GM-CSF) on tumor tissues and tumor cell lines that are derived from the neural crest. To determine whether normal neural cells express functional GM-CSF receptors, we isolated and analyzed primary rat brain cells, including microglia, astrocytes, and oligodendrocytes. Scatchard analysis of equilibrium binding of 125I-GM-CSF to primary rat oligodendrocytes showed an average of 1,110 GM-CSF binding sites per cell, with a kd of 20 pmol/L. In six separate experiments, no specific binding was detectable on the astrocyte population. Microglia were used in competitive binding experiments with oligodendrocytes, and addition of microglia did not increase the specific binding of labeled ligand to oligodendrocytes. In dose-response assays, we measured 3H-thymidine uptake in rat oligodendrocytes, microglia and control murine 32D cells stimulated with various concentrations of GM-CSF. Over concentration ranges of 0.025 to 1000 pmol/L, cell proliferation and peak 3H-thymidine incorporation was observed at approximately 30 pmol/L for both the control cells and the oligodendrocytes. However, the microglial cells did not proliferate in response to GM-CSF. These data indicate the presence of a functional receptor for GM-CSF on primary rat oligodendrocytes, and suggest that hematopoietic growth factors such as GM-CSF may play a role in nerve cell development, function, or response to injury.     

中国南方汉族人群STR位点遗传多态性研究及其在亲子鉴定中的应用

目的 调查中国南方汉族人群的D8Sll79、D21Sll、D18S51、D5S818、vWA、FGA、D3S1358、D13S317、D7S820等9个短串联重复(STR)位点多恋性，探索STR基因分析在亲子鉴定案例中的应用价值。方法 应用PCR复合扩增和四色荧光自动化检测技术对574名南方汉族无关个体的9个STR位点作基因分型。结果 获得中国南方汉族人群中9个STR位点的等位基因频率，其基因型分布符合Hardy—Weinberg平衡。经统计分析，D8Sll79、D21Sll、D18S51、D13S317、D7S820、D5S818、vWA和FGA位点属于高鉴别力、高杂合度、高信息含量的STR位点，D3S1358属于中高度多态性位点。9个STR位点的累积个体识别能力(DP)、多态信息含量(PIC)、杂合度(H)和非父排除率(PE)均为0.9999。在210例亲子鉴定案例中，否定亲权的28个案例中均至少有3个位点不符；认定亲权的182例中，亲子关系指数(RCP)大于99．73％的有179例(98．35％，179／182)，另外3例(1．65％，3／182)RCP值为95．00％一99．73％。结论 研究获得了中国南方汉族人群中9个STR位点的等位基因频率。应用这9个STR位点的等位基因鉴定，能成功地开展亲子鉴定，显提高亲子关系指数。     

丙戊酸单药治疗与癫痫患者血浆同型半胱氨酸水平间关系的Meta分析

目的分析癫痫患者血浆同型半胱氨酸水平变化与丙戊酸单药治疗间的关系。方法选择epileDsv、valproate、homocysteine和epilep。为检索词,计算机检索1990年1月-2013年8月美国国立医学图书馆、科学引文索引数据库、荷兰医学文摘等数据库,获得丙戊酸单药治疗与癫痫患者血浆同型半胱氨酸水平间关系的相关英文文献,均为丙戊酸单药治疗的癫痫患者与正常对照受试者血浆同型半胱氨酸水平比较的病例．对照临床研究。通过Newcastle—Ottawa量表独立进行文献质量评价和数据提取,Stata12．0统计软件行Meta分析。结果共纳入符合条件的英文文献8篇,包括266例行丙戊酸单药治疗的癫痼患者和489例正常对照受试者,所有纳入文献质量评分均〉6分。Meta分析显示,丙戊酸单药治疗组患者血浆同型半胱氨酸水平显著高于正常对照组[标准化均数差（SMD）：0．620,95％CI：0．320-0．920;P=0．000];经异质性检验存在显著异质性（I^2=65．600％,P=0．005）,根据不同地区和受试者年龄差异行进一步亚组分析,结果显示西亚组癫痫患者异质性风险（I^2=47．400％,P=0．107）较整体（I^2=65．600％,P=0．005）降低。采用敏感性分析评价Meta分析之稳定性,当任何一项研究被剔除后,相应的SMD值均不发生变化,表明分析结果稳定性良好。结论丙戊酸单药治疗可显著增加癫痫患者血浆同型半胱氨酸水平,后者是否受种族因素的影响尚待进一步研究。     

急性左心衰竭患者不同院前急救模式的效果比较

目的：探讨急性左心室衰竭采用不同抢救模式的临床效果。方法整群选取64例于2010年5月-2013年5月期间该院接收的急性左心衰竭患者,将其平分为对照组和研究组,将边转运边治疗的抢救模式应用于对照组,将先抢救后搬运的抢救模式应用于研究组,观察两组疗效。结果研究组的抢救有效率明显高于对照组,且在搬运过程中,其病情恶化率明显低于对照组,血样饱和度明显高于对照组,MEWS评分明显低于对照组,差异有统计学意义(P<0.05)。结论对急性左心衰竭患者采取先抢救后转运的抢救方式,抢救效率高,发生意外事件少,患者病情较稳定,值得推广。     

Quercetin Attenuates Benzo(α)pyrene-induced CYP1A Expression

<正>We studied effects of nutrient quercetin on cytochromes’Р450 1А(CYP1A)activities(measured spectrofluorimetrically using 7-ethoxy-resorufin for CYP1A1 and 7-methoxy-resorufin for CYP1A2 as substrates),on mR NA levels(measured by RT-PCR),and on DNA-binding activities(evaluated by an electrophoretic mobility shift assay)of proteins regulating CYP1A expression in untreated and benzo(α)pyrene(Ba P)-treated rats.Wistar rats