血管内皮生长因子与急性白血病骨髓的血管新生

目的:探讨血管内皮生长因子(VEGF)在急性白血病及其骨髓的新生血管之间的关系,为白血病的治疗寻找新的治疗方法。方法:查阅总结近15年来国内外相关文献,对VEGF的性质作用特点以及与急性白血病的关系进行综述。结果:白血病细胞表达较高的VEGF,VEGF促使血管生成和内皮细胞增生,白血病细胞与骨髓新生血管之间存在密切的关系。结论:抗VEGF和抗新生血管治疗有可能成为治疗急性白血病的新的思路和方法。     

葡萄糖生物传感器研究

葡萄糖氧化酶（ｇｌｕｃｏｓｅｏｘｉｄａｓｅ，ＧＯＤ）经固定化后与氧电极组装成葡萄糖生物传感器。这一生物传感器可在非常短的响应时间内完成对葡萄糖的测定，其线性范围为０～３０ｍｇ／ｄＬ，能稳定使用２２ｄ。测定的相对标准偏差小于１．２％。与传统方法相比有良好的相关性。     

Excitatory effect of histamine on neuronal activity of rat cerebellar fastigial nucleus in vitro

The cerebellar fastigial nucleus (FN) holds an important role in motor control and body balance. Previous studies have revealed that the nucleus is innervated by direct hypothalamocerebellar histaminergic fibers. However, the functional role of histaminergic projection in cerebellar FN has never been established. In this study, we investigated the effect of histamine on neuronal firing of cerebellar FN by using slice preparations. Sixty-five FN cells were recorded from 47 cerebellar slices, and a vast majority of the cells responded to histamine stimulation with an excitatory response (58/65, 89.2%). Perfusing slices with low-Ca2 /high-Mg2 medium did not block the histamine-induced excitation (n=10), supporting a direct postsynaptic action of histamine on the cells. Furthermore, the excitatory effect of histamine on FN neurons was not blocked by selective histamine H1 receptor antagonist triprolidine (n=15) or chlorpheniramine (n=10), but was effectively suppressed by ranitidine (n=15), a highly selective histamine H2 receptor antagonist. On the other hand, highly selective histamine H2 receptor agonist dimaprit (n=20) instead of histamine H1 receptor agonist 2-pyridylethylamine (n=16) mimicked the ex- citatory effect of histamine on FN neurons. The dimaprit-induced FN neuronal excitation was effectively antagonized by selective histamine H2 receptor antagonist ranitidine (n=13) but not influenced by se- lective histamine H1 receptor antagonist triprolidine (n=15). These results demonstrate that histamine excites cerebellar FN cells via the histamine H2 receptor mechanism and suggest that the hypotha- lamocerebellar histaminergic fibers may modulate cerebellar FN-mediated sensorimotor integration through their excitatory innervations on FN neurons.     

中枢型尼古丁受体与阿尔茨海默病

阿尔茨海默病是一种以渐进性的认知功能障碍为主要特征的神经退行性疾病,该病最终会导致死亡,是痴呆病中最常见的一种类型。近年来研究发现中枢尼古丁受体在AD的发病中起着非常重要的作用,本文对此进行综述。     

谷氨酸及其受体与运动

谷氨酸是中枢神经系统中主要的兴奋性神经递质，它的变化与运动性中枢疲劳的产生有密切的联系．谷氨酸是通过谷氨酸受体传递兴奋性信息的，谷氨酸受体是中枢神经系统主要的兴奋性神经受体，分为离子型受体与代谢型受体．谷氨酸受体在学习．记忆的形成、脑缺氧．缺血导致的病变及其它神经系统功能中扮演着重要的角色．     

Effect of UPP on the expression of VEGF and its receptors in mouse uterus during peri-implantation

On day 3 of gestation ,one uterine horn of female pregnant mouse was injected intraluminally with 5 μL 0.1μg/mL lactacystin,a specific inhibitor of ubiquitin-pro-teasome pathway (UPP),while the contralateral horn served as control ,Animals were sacrificed by cervical dislocation on day 5,6,7 of gestation ,respectively,Then the number of implanted embryos in each uterine horn was calcuated,and the expression of VEGF and its receptors was examined,The data showed that the number of implanted embryos was decreased significantly after treatment with lactacystin ,The results of RT-PCR and Western blot indicated that expression of VEGF and its receptors at mRNA and protein levels was significantly decreased in the treated uterus,menawhile,the expression of HIF-1α(the α subunit of HIF ,a transcrip-tional factor of VEGF) was reduced at both mRNA and protein levels,These data suggested that the effect of UPP on VEGF expression was realized through regulating HIF-1α expression .In addition ,UPP is likely to take part in the modulation of VEGF receptors expression ,These changes may be one of the reasons for the reduction of implanted embryos.     

运动与脑中谷氨酸受体及其基因表达

谷氨酸作为中枢神经系统中最重要的兴奋性神经递质。它与相应的细胞膜受体即谷氨酸受体相结合而发挥作用。本文对谷氨酸受体及其基因的结构和功能进行了综述，并在此基础上对运动性中枢疲劳和谷氨酸受体基因之间的可能关系做了初步的探讨和展望。     

白藜芦醇诱导VEGF表达促进缺血再灌注小鼠新生血管形成

研究白藜芦醇能否诱导小鼠缺血,再灌注后缺血区域新生血管形成及其与血管内皮细胞生长因子(VEGF)表达的相关性,用90只雄性BALB/c小鼠随机分为单纯缺血组、白藜芦醇组及假手术组,采用大脑中动脉线栓法制作局灶性脑缺血模型,免疫组化法测定微血管密度,Western blot检测VEGF蛋白表达.结果白藜芦醇处理组与单纯缺血对照组微血管计数存在差异,并且有统计学意义(P<0. 05),白藜芦醇处理组在各时间点VEGF蛋白表达水平均较高(P<0.05).说明白藜芦醇可以诱导脑缺血后VEGF早期表达,促进缺血区域新生血管形成,发挥脑保护作用.