Antibody-dependent neutrophil-mediated parasite killing in non-lethal rodent malaria

The effects of administrating recombinant human granulocyte colony-stimulating factor (rhG-CSF) and passively transferring immune serum on infection with an attenuated variant of Plasmodium berghei XAT (Pb XAT), in severe combined immunodeficiency (SCID) mice were examined. In immune competent (C.B-17) mice, the attenuated parasite infection was inevitably self-resolving and degenerating forms inside erythrocytes appeared, coinciding with the drop in parasitaemia, whereas SCID mice were unable to control parasite growth and all the mice died. Continuous administration with rhG-CSF caused neutrophilic granulocytosis in both SCID and C.B-17 mice. The effect of rhG-CSF on the infection in C.B-17 mice was to suppress the course of the parasitaemia at an early phase whereas it had no effect in SCID mice. When immune serum was transferred on the day of infection, the prepatent period was prolonged two days in both SCID and C.B-17 mice. When administration with rhG-CSF was combined with transfer of immune serum, SCID mice showed four days delay in patency and degenerating parasites were seen during the course of parasitaemia, although the infection was ultimately fatal. C.B-17 mice similarly treated showed a seven day delay in the onset of the patent parasitaemia which was of a lesser magnitude and shorter in duration compared with control mice. On the other hand, when C.B-17 mice were splenectomized three weeks before infection and then treated with rhG-CSF and immune serum, no degenerating parasites were seen during the infection and all mice died with high parasitaemias. These results show that antibody-dependent neutrophil-mediated parasite killing may occur in the spleen of mice infected with P. berghei XAT.     

低氧对口腔鳞癌细胞系血管内皮生长因子和MMP-2的影响

目的 :研究低氧对体外培养的口腔鳞癌细胞系血管内皮生长因子 (vascularendothelialgrowthfactor ,VEGF)和明胶酶 A(matrixmetalloproteinase 2 ,MMP 2 )的影响。 方法 :分别用酶联免疫吸附实验 (ELISA)和半定量逆转录聚合酶链反应 (RT PCR)测定了低氧处理不同时间段时口腔鳞癌细胞系TSCCa和GNM细胞的细胞中VEGF和MMP 2的活性和mRNA表达情况。结果 :低氧处理 4h时 ,VEGF和MMP 2的活性便显著增加 ,8h时达到最高 ,GNM细胞中VEGF和MMP 2分别增加 2倍和 2 .5倍 ;而TSCCa细胞中VEGF和MMP 2增加的更为明显 ,分别增加了 6倍和 4倍。RT PCR结果显示GNM细胞VEGF和MMP 2mRNA表达水平均较TSCCa细胞高 (P <0 .0 5 ) ,低氧处理时在TSCCa细胞中VEGF和MMP 2增加的尤为明显。结论 :低氧可通过调节口腔鳞癌细胞VEGF和MMP 2的活性和mRNA的表达在口腔鳞癌血管形成中起重要作用     

Treatment time analysis for extensive amalgam restorations

The treatment times for the fabrication of Extensive Amalgam Restorations (EAR) as recorded in a longitudinal clinical trial at the Dental School in Nijmegen were analyzed. 269 EAR's with different retention methods were made on molars by three operators. A mean total treatment time of 60 min was found. The factor operator had a significant influence on all treatment phases resulting in a 26% difference in total treatment time between operators. Also significant influences were found in some treatment phases for the factor retention, side location of the tooth and extension of the restoration. The results of this study with regard to treatment times must be considered from the perspective of the quality of the care provided.     

Enhancing and suppressive effects of tumour necrosis factor/cachectin on growth of Trypanosoma musculi

The effect of human recombinant TNF on the growth of T. musculi has been investigated. When added to parasites cultured in vitro, TNF inhibited their growth. In the presence of thioglycollate-elicited peritoneal exudate cells, the opposite effect was seen and TNF enhanced the growth of trypanosomes in vitro. Similarly, administration of TNF in vivo during the course of infection led to a net increase in the parasite population. It is suggested that TNF exerts a direct antitrypanosomal effect while simultaneously promoting the growth of the parasite through an indirect effect mediated via the host's cells, possibly the macrophages.     

阿片类依赖者的社会心理因素分析

本文对２８４例自愿戒毒的阿片类依赖者的部分社会心理因素进行分析。３０ａ以下、初中以下文化的青年，特别是待业和个体户，性格不稳定者是阿片类物质滥用的高危人群，为预防的重点对象。阿片类依赖戒断治疗后的高复吸率，反映出目前的治疗仅注重戒断，忽视康复和回归社会后的随访工作。今后应在人力、财力方面向康复和社会随访方面转移和倾斜，方能真见成效。     

胃腺癌微卫星不稳定性与VEGF蛋白表达关系的研究

目的：探讨胃癌微卫星不稳定性(MSI)与胃腺癌中皿管内皮生长因子(VEGF）之间的关系。方法：应用PCR—SSCP技术检测30例胃腺癌5个位点的微卫星不稳定性，同时应用免疫组织化学的方法检测肿瘤皿管内皮生长因子(VEGF)蛋白的表达。结果：MSI阳性率为43．4％(13／30)。VEGF阳性率为60％(18／30）。MSI—H胃癌VEGF的表达显著减少。结论：MSI—H的胃癌与MSS胃癌可能存在两种不同的胃癌及肿瘤血管新生形成的途径。MSI—H肿瘤较低的VEGF表达可能可以解释为何MSI-H胃癌有较低的侵袭性。     

穹隆-海马伞切断对大鼠脑内TrkA表达的影响

①目的　探讨穹隆 海马伞切断对大鼠脑内不同部位神经生长因子受体TrkA表达的影响及临床意义。②方法　成年健康雌性Wistar大鼠 10只 ,随机分为穹隆 海马伞切断模型组和假手术组。两组大鼠均常规取海马CA1区、皮质区、杏仁复合体区、基底前脑Meynert核等部位脑组织与假手术组比较TrkA阳性细胞表达情况。③结果　假手术组大脑各观察区有基础水平的TrkA表达。模型组大脑海马CA1区、大脑皮质区、杏仁复合体区以及Meynert核区TrkA阳性细胞数明显减少 (t=3.94 4～ 8.4 4 2 ,P <0 .0 5 )。 ④结论　穹隆 海马伞切断可致大鼠脑内多部位TrkA表达减少 ,其可能是导致认知和情绪损伤的原因之一。     

肺癌组织中血管内皮生长因子受体Flt1及KDR的表达及其与肿瘤转移和预后的关系

①目的　探讨肺癌中血管内皮生长因子受体Flt1、KDR的表达与其转移及预后的关系。②方法　应用免疫组织化学PowerVisionTM PV90 0 0法 ,测定 75例肺癌标本中Flt1、KDR的表达。③结果　肺癌组织中Flt1、KDR的表达较为广泛 ,主要位于肿瘤细胞胞浆及胞膜上 ,纤维母细胞和血管内皮细胞胞浆中亦有表达。Flt1、KDR在肿瘤细胞中的阳性率均显著高于在间质纤维母细胞中的表达 (χ2 =6 .0 7、5 .88,P <0 .0 5 )。肿瘤细胞及纤维母细胞中该两种受体的阳性率在不同年龄、不同性别及不同病理类型、不同病理分级之间差异均无显著性 (χ2 =0 .0 1～4 .84 ,P >0 .0 5 ;P =0 .2 9～ 0 .79)。肿瘤细胞中Flt1、KDR的阳性表达率在 3组不同大小的肿瘤间差异均有显著性(χ2 =1 0 .35、7.2 9,P <0 .0 5 ) ,而纤维母细胞中差异均无显著性 (χ2 =2 .86、2 .5 6 ,P >0 .0 5 ) ;肿瘤细胞及纤维母细胞中Flt1、KDR的阳性率在淋巴结有、无转移两组间的差异均有显著性 (χ2 =4 .72～ 9.32 ,P <0 .0 5 ) ,在 3组不同术后生存时间病人间亦均有显著性差异 (χ2 =8.81～ 1 9.1 9,P <0 .0 5 )。肿瘤细胞中Flt1、KDR的表达呈极显著性正相关 (r =0 .4 4 ,P <0 .0 1 )。④结论　肺癌的生长主要依赖自分泌机制 ,联合检测Flt1、KDR可能对肺癌转移     

参附注射液对肠缺血-再灌注大鼠肿瘤坏死因子α的影响

目的观察肿瘤坏死因子α(TNF-α)在大鼠肠缺血-再灌注损伤过程中的作用及参附注射液对TNF-α的影响,探讨参附注射液防治肠缺血-再灌注损伤机制。方法 SD大鼠随机分为肠缺血-再灌注组(IR组)、参附注射液预处理组(SF组)和假手术组(C组)。采用阻断肠系膜上动脉(SMA)的方法制造肠缺血-再灌注模型。分别测定各组动物血浆、肠组织TNF-α含量及血液动力学变化;光镜观察肠粘膜损伤情况。结果IR组再灌注后MAP下降,与C组和SF组比有显著性差异(P<0.01);SF组肠粘膜损伤程度减轻,与IR组比有显著性差异(P<0.01);SF组血浆及肠组织TNF-α水平降低,与IR组比有显著性差异(P<0.01)。结论参附注射液可明显防治大鼠肠缺血-再灌注导致的肠粘膜损伤,这种作用可能是通过抑制TNF-α的释放实现的。