ODC反义寡核苷酸对K562细胞生长抑制作用

鸟氨酸脱羧酶(ornithine decarboxylase,ODC)是催化多胺生物合成的限速酶.过去的研究表明多胺在维持肿瘤恶性表型中起着重要作用.用ODC不可逆抑制剂抑制多胺生物合成不仅能抑制肿瘤细胞的增殖而且还诱导细胞分化.近年我们采用反义技术,以ODC反义RNA转染肿瘤细胞,通过对ODC表达的封闭,成功地使其恶性表型得到了逆转.提示抑制肿瘤细胞的多胺合成可能是抗癌的有效途径.本文用ODC反义寡核苷酸控制肿瘤细胞的多胺生物合成,观察了其对K562细胞生长特性的影响,以期为ODC反义寡核苷酸在肿瘤临床的应用提供实验依据.     

Antivirus effect of polysaccharides of brewer yeast in vitro]

The antivirus effect of polysaccharides of brewer yeast from yeast mud on 13 kinds of viruses including DNA and RNA virus along with their mechanisms were studied. The result showed that this effect was remarkable on the infections with poliovirus III, adenovirus III, ECHO6 virus, enterovirus 71, vesicular stomatitis virus, herpesvirus I, II, coxsackie A16 virus and coxsackie B3 virus. The polysaccharides of brewer yeast could also inhibit the development of cytopathic effect(CPE) and protect cultural cells from being infected with the above viruses.     

EB病毒VCA-IgA抗体水平与鼻咽癌病人远期疗效关系

目的：分析ＥＢ病毒血清学ＶＣＡ－ＩｇＡ抗体与鼻咽癌病人远期疗效关系，为临床治疗提供参考依据。方法：１９８５年本院病理确诊的５２２例鼻咽癌病人，按治疗前、后ＶＣＡ－ＩｇＡ抗体滴度分为三组：低滴度组（１：５～１：２０）、中滴度组（１：４０～１：８０）和高滴度组（１：１６０以上），随访１０年，比较生存率的异同。结果：治疗前鼻咽癌病人高滴度组１０年生存率低于低滴度组（Ｐ＜０．０５），但和中滴度组差别无显著性（Ｐ＞０．０５）。治疗后三组病人１０年生存率比较，高、中滴度二组差别无显著性（Ｐ＞０．０５），但低于低滴度组。结论：ＥＢ病毒ＶＣＡ－ＩｇＡ抗体水平可以作为估计预后的重要参考依据，与远期疗效有密切关系。     

云南玉溪地区甲型副伤寒沙门菌的耐药性变迁

目的了解本地区甲型副伤寒沙门菌对几种临床常用药物的耐药现状,重点讨论培氟沙星的耐药性变迁。方法就本院1999年1月至2004年8月从患者临床标本中分离的2335株甲型副伤寒沙门菌,对几种临床常用抗菌药物的药敏试验结果作动态分析。结果甲型副伤寒沙门菌对培氟沙星的耐药率已由1999年的0上升到2004年的98.1%(P<0.01),MIC90≥4mg·L-1;头孢噻肟、头孢他啶、头孢西丁、亚胺培南、呋喃妥因以及复方磺胺甲口恶唑的耐药率均相对较低,MIC90分别为≤4、8、4、4、32和10mg·L-1。结论甲型副伤寒沙门菌对培氟沙星的耐药率上升迅速;临床需加强对氟喹诺酮类药物的合理使用。     

不同来源的N-乙酰神经氨酸裂合酶的特性及在大肠埃希菌中的表达

综述了N-乙酰神经氨酸裂合酶的特性、应用及反应机理，对不同来源的N-乙酰神经氨酸裂合酶进行了比较。简要阐述N-乙酰神经氨酸裂合酶在大肠埃希菌中的克隆表达及其纯化。     

Intracerebral transportation and cellular localisation of insulin-like growth factor-1 following central administration to rats with hypoxic-ischemic brain injury

Insulin-like growth factor-1 (IGF-1) has been shown to be neuroprotective when administered centrally following hypoxic-ischemic (HI) brain injury. However, the cerebral distribution and site of action of IGF-1 after intracerebroventricular (i.c.v.) administration are not known. A unilateral HI brain injury was induced in adult rats by a modified Levine method. Either 3H-IGF-1 alone, or in combination with unlabelled IGF-1, was administered into the lateral ventricle 2 h after injury. The activity of 3H-IGF-1 signal in the potentially injured cortex was compared between two treatment groups using image analysis. The regional distribution and cellular localisation of 3H-IGF-1 were examined autoradiographically in potentially injured hemispheres at 0.5 and 6 h after administration. Tritiated IGF-1 was detected predominantly in the pia mater, perivascular spaces and subcortical white matter tracts 0.5 h after administration and decreased by 6 h (p<0.05). The signals associated with the perivascular spaces and pia mater were not blocked by unlabelled IGF-1, suggesting non-saturable binding in these brain areas. IGF-1 signal was co-localised with IGF binding protein (IGFBP)-2 immunostaining in the white matter tracts where the signal was blocked by unlabelled IGF-1, suggesting competitive association. IGF-1 signal associated with neurons and glia was maximal in the cerebral cortex and less in the CA1-2 subregion of the hippocampus which were blocked by unlabelled IGF-1 (p<0.05). The signals from cortical neurons did not decrease 6 h after administration, suggesting specific and persistent binding to these cells. Our results indicate that centrally administered IGF-1 can be translocated to neurons and glia via the perivascular circulation and the ependymal cell-white matter tract pathways.     

N-terminal tripeptide of IGF-1 (GPE) prevents the loss of TH positive neurons after 6-OHDA induced nigral lesion in rats

The effect of the N-terminal tripeptide of insulin-like growth factor (IGF)-1, glycine-proline-glutamate (GPE), as a neuroprotective agent for nigro-striatal dopaminergic neurons was examined in the present study using a rat model of Parkinson's disease. A unilateral nigro-striatal lesion was induced in rats by injecting 6-hydroxydopamine (6-OHDA) into the right medial forebrain bundle (MFB). GPE (3 microgram) or its vehicle was administered intracerebroventricularly (i.c.v.) 2 h after the 6-OHDA lesion. Tyrosine-hydroxylase (TH) immunohistochemistry in the substantia nigra compacta (SNc) and the striatum were examined 2 weeks after the lesion. Following 6-OHDA injection, the number of TH immunopositive neurons in the ipsilateral SNc was reduced. The density of TH immunostaining was also reduced in the ipsilateral SNc and the striatum. Treatment with a single dose of GPE (n=9) significantly prevented the loss of TH immunopositive neurons (p<0. 001) and restored the TH immunoreactivity in both the SNc and the striatum compared with the vehicle control group (n=9, p<0.001). The results suggest that GPE showed promise as a potential treatment for Parkinson's disease.     

江门市3～6岁异常视力儿童屈光状态分析

目的了解江门市异常视力儿童屈光状态。方法对江门市幼儿园的8510名3～6岁儿童进行视力普查。对单眼裸眼视力<0.9者(1116例2232只眼)的屈光状态及弱视患儿的屈光状态进行了分析。结果屈光不正总患病率为13.01%;远视、混合散光、近视患病率依次为9.85%、2.36%、0.80%(P<0.05);轻、中、重度屈光不正患病率依次为7.34%、3.96%、1.70%(P<0.05);屈光不正有年龄特点(4岁组患病率高于其他年龄组);弱视患病率为3.74%;弱视首次检出率为88.23%。结论远视性屈光不正是导致弱视的主要原因。     

儿童维生素A缺乏与感染性疾病的关系

[目的]了解儿童血清维生素A缺乏(vitamin A deficiency,VAD)与感染性疾病的关系. [方法]在避光条件下采集儿童指血、分离血清,以严格的质量控制,用微量荧光法检测血清维生素A(vitamin A,VA)浓度. [结果]两周内不同地区儿童发热率、急性呼吸道感染(ARI)、腹泻,发病率随血清VA缺乏率的增加而增加;儿童平均血清VA的含量随发热率、发病率的增加而下降. [结论]我国儿童血清VA含量低、缺乏率高的儿童不论个体或群体都表现为易于发生急性感染疾病,VAD是引起儿童易于发生急性感染性疾病的重要原因之一.     

人工晶状体的设计对后囊膜混浊的影响

后囊膜混浊是白内障囊外摘除术后最主要的并发症之一。后囊膜混浊的发生是多因素参与的结果,手术方式的改进、人工晶状体的改良、术后炎症反应的控制都可以减少后囊膜混浊的发生。本文就人工晶状体的设计对后囊膜混浊的影响作一综述。