不同来源人树突状细胞的培养诱导及鉴定

目的通过对不同来源的人树突状细胞的体外培养与诱导,建立树突状细胞的稳定体系,为更进一步实验打好基础。方法分离人外周血单个核细胞(PBMC),用不同树突状细胞亚群的特异性表面标记抗体磁珠分离树突状细胞前体,通过加入不同的刺激分子,分别诱导未成熟、成熟及活化等不同阶段的树突状细胞。结果与未成熟树突状细胞相比,成熟活化型树突状细胞表达HLA-DR、CD86以及CD40等共刺激分子明显升高,其中MoDC对成熟标记物CD83的表达水平亦较高。此外,两者在形态上也有明显的差异。结论通过对不同亚群树突状细胞的体外诱导、培养和鉴定,建立了较为成熟的研究树突状细胞的平台,为深入开展工作打下基础。     

乙酸钙-鲍氏不动杆菌临床分离与耐药性的7年监测

目的了解1998~2004年乙酸钙-鲍氏不动杆菌在临床标本中的分离情况及其耐药趋势,为临床感染的预防和治疗提供参考资料。方法回顾分析1998~2004年间所有标本中乙酸钙-鲍氏不动杆菌的分离率,菌株在标本和病区的分布以及对14种抗菌药物的耐药率。结果乙酸钙-鲍氏不动杆菌的分离率有逐年升高的趋势,从1998年的0.18%增至2004年的1.48%;其在呼吸道标本的分离率最高(70.58%),其次是尿液(9.42%)、血液(4.63%);病区分布以重症监护室最高(47.28%),乙酸钙-鲍氏不动杆菌对14种抗菌药物的耐药率,1998年仅有氨曲南>50%,而到2004年仅头孢哌酮/舒巴坦的耐药率<50%,其他13种均>50%;其耐药率均呈递增的趋势,耐药性增幅列前3位分别为:头孢他啶11.1%~88.9%、亚胺培南0~64.8%、复方新诺明0~64.0%。结论乙酸钙-鲍氏不动杆菌的临床分离率在增加,其对多数抗菌药物有较高的耐药性,且耐药率呈逐年上升趋势,尤其是对亚胺培南耐药率的快速增长,应引起临床抗感染治疗的高度重视。     

宁波登革热患者血清病毒分离及其E/NS基因片段序列分析

目的：从病人血清中分离登革热病毒，分析其与国际不同地区流行代表毒株之间的遗传关系。方法：利用C6／36细胞培养方法从早期病人血清中分离登革热病毒，利用RT—PCR方法进行鉴定，扩增E／NS基因片段并测序，将结果与GENBANK中其他登革热1型病毒E／NS基因片段的240bp核苷酸进行比较，用计算机软件分析结果。结果：从早期病人血清中分离到两株登革热1型病毒，其核苷酸片段与亚洲流行株系的GD0599、GZ80、Djibouti和Taiwan87的同源性较高，分别为99．6％、97．5％、95．4％和95％。结论：引起此次宁波登革热疫情的登革热1型病毒属于亚洲株系。     

白花丹醌的提取分离鉴定

目的对多民族药材白花丹(Phum bago zeylanicaL.)中的白花丹醌进行提取分离和鉴定。方法用硅胶柱层析分离;用TLC,IR,MS,NMR等技术鉴定结构。结果从白花丹中分离得到桔黄色针状结晶,根据理化性质、薄层色谱及光谱数据分析,鉴定为白花丹醌(P lumbagin)。结论为建立白花丹药材的质量控制方法打下了物质基础,对白花丹临床用药安全及进一步开发具有极其重要的意义。     

Reduced N-acetylaspartate in the temporal cortex of rats reared in isolation.

BACKGROUND: Isolation rearing of rats is a nonpharmacologic, nonlesion manipulation that leads to deficits in prepulse inhibition (PPI) and other behavioral and neurochemical alterations reminiscent of schizophrenia. N-acetylaspartate (NAA) is present in high concentrations in the central nervous system and is found primarily in neurons. N-acetylaspartate is considered to be a marker of both neuronal loss and cellular dysfunction. Magnetic resonance spectroscopy studies have shown reductions of cortical and hippocampal NAA in schizophrenia, and a recent postmortem study has demonstrated a regionally selective temporal cortex deficit. METHODS: The aim of the present study was to determine whether rats reared in isolation exhibit deficits in PPI and reductions in NAA in discrete brain regions, namely the temporal cortex, frontal cortex, hippocampus, and striatum. RESULTS: Compared with socially housed rats, isolation rearing resulted in PPI deficits (p <.05) and reductions in NAA in the temporal cortex (p <.001), with no significant change in the other regions investigated. CONCLUSION: These results suggest a disturbance of neuronal function, reflected by NAA reductions in the temporal cortex in isolation-reared rats, providing further evidence that isolation rearing can mimic aspects of the neuronal pathology of schizophrenia.     

孕妇宫颈巨细胞病毒分离及其母婴传播的初步探讨

孕妇宫颈巨细胞病毒(CMV)排出率为4.12％(8/193)。宫颈排出CMV的母亲所分娩的6名婴儿中有4名受感染,其中1名从唾液和尿排出CMV长达7个月以上。从3名母亲的乳汁分离出CMV,其中1名特续存在1个月以上。3名从宫颈分泌物和乳汁排出CMV者,其婴儿均受到感染。结果表明CMV在母婴之间传播。     

Hormonal changes during long-term isolation

Confinement and inactivity induce considerable psychological and physiological modifications through social and sensory deprivation. The aim of the SFINCSS-99 experiment was to determine the cardiovascular and hormonal pattern of blood volume regulation during long-term isolation and confinement. Simulation experiments were performed in pressurized chambers similar in size to the volumes of modern space vehicles. Group I consisted of four Russian male volunteers, who spent 240 days in a 100-m³ chamber. Group II included four males (one German and three Russians) who spent 110 days in isolation (200-m³ module). The blood samples, taken before, during and after the isolation period, were used to determine haematocrit (Ht), growth hormone (GH), active renin, aldosterone, and osmolality levels. From the urine samples, electrolytes, osmolality, nitrites, nitrates, cortisol, antidiuretic hormone (ADH), aldosterone, normetanephrine and metanephrine levels were determined. The increase in plasma volume (PV) that is associated with a tendency for a decrease in plasma active renin is likely to be due to decreased sympathetic activity, and concords with the changes in urinary catecholamine levels during confinement. Urinary catecholamine levels were significantly higher during the recovery period than during confinement. This suggests that the sympathoadrenal system was activated, and concords with the increase in heart rate. Vascular resistance is determined by not only the vasoconstrictor but also vasodilator systems. The ratio of nitrite/nitrate in urine, as an indicator of nitric oxide release, did not reveal any significant changes. Analysis of data suggests that the duration of the isolation was a main factor involved in the regulation of hormones.     

Effects of alcohol exposure during development on social behavior in rats

In addition to the cognitive deficits associated with fetal alcohol syndrome (FAS), clinical and animal studies indicate that alcohol exposure might also have detrimental effects on social behavior. In a rat model of FAS, experimental rats were given alcohol from gestational day (GD) 1 to 22 and from postnatal day (PD) 2 to 10, a period roughly equivalent to all three trimesters in humans. Control groups consisted of rats exposed to the administration procedures but not to alcohol and nontreated rats. At 30 days of age, rats were tested for social behavior in an alley maze that contained its cagemate in the goal box. After varying periods of isolation, the animals' latencies to reach the goal box and their social behaviors once inside the goal box were recorded. Alcohol-exposed animals ran faster than control rats to the occupied goal box regardless of the amount of isolation. The alcohol-exposed animals also exhibited aberrant social interactions with their cagemate once inside the goal box compared to one or both of the control groups. Specifically, the alcohol-exposed animals showed greater amounts of anogenital sniffing, chasing, hopping and darting, and retrieving and lesser amounts of pinning and biting compared to one or both of the control groups. The alcohol-induced change in anogenital sniffing varied over increasing amounts of isolation compared to both control groups, but the alterations in the other behaviors did not. It is argued that the altered social behavior of alcohol-exposed animals is not the result of changes in the animals' motivational state or social learning and may be the result of an increased responsiveness to social stimuli.     

Technical aspects of islet preparation and transplantation

The introduction of insulin therapy for the management of diabetes mellitus is arguably the greatest milestone in the history of modern medicine. -cell replacement therapy is the only treatment that reestablishes and maintains long-term physiological normoglycemia. Until recently, successful clinical outcomes of pancreas transplantation for patients with long-standing diabetes were much superior to that of islet transplantation. Significant advances in islet isolation and purification technology, the development of more specific and less diabetogenic immunosuppressants and the prophylactic administration of antiviral agents have rekindled a worldwide interest in islet transplantation. This chapter will review the rationale of islet transplantation and the development of islet isolation and purification. The challenges facing clinical islet transplantation in the twenty-first century will also be introduced.     

Cerebrosides from longan arillus

From the pulp of Euphoria longana (Longan Arillus), three cerebroside molecular species have been isolated. Six known cerebrosides, soyacerebrosides I and II, 1-O-beta-D-glucopyranosyl-(2S,3R,4E,8E)-2-(2'-lignoceroylamino)-4,8-octadecadiene-1,3-diol (longan cerebroside I) and its 8Z isomer (longan cerebroside II), momor-cerebroside I, and phytolacca cerebroside, were identified as major components of these cerebroside molecular species. All the cerebrosides were shown to be a mixture of geometrical isomers (8E and 8Z) of sphingosine-type or phytosphingosine-type glucocerebrosides possessing 2-hydroxy fatty acids. The structures of these cerebrosides have been determined on the basis of chemical and spectroscopic evidence.