促肝细胞生长素诱导人肝癌细胞（BEL－7402）凋亡

本文从细胞学、ＤＮＡ凝胶电泳、流式细胞术三方面研究促肝细胞生长素（ｐＨＧＦ）在体外对肝癌细胞增殖活性的影响。结果表明：ｐＨＧＦ对肝癌ＢＥＬ－７４０２细胞增殖有抑制作用，并存在剂量和时间相关性。其４８ｈ的半数抑制浓度（ＩＤ５０）为０．３７ｍｇ／ｍｌ±０．０４ｍｇ／ｍｌ。而３７℃灭活的ｐＨＧＦ对ＢＥＬ－７４０２细胞增殖在１５ｈ无抑制作用，在２４和４８ｈ抑制作用很弱（ＩＤ５０＞１．５ｍｇ／ｍｌ）。ＤＮＡ凝胶电泳结果表明，ｐＨＧＦ可诱导ＢＥＬ７４０２细胞产生细胞凋亡（Ａｐｏｐｔｏｓｉｓ）。流式细胞术（ＦＣＭ）结果显示：ｐＨＧＦ抑制ＢＥＬ－７４０２细胞增殖过程是先使细胞停留在Ｇ０／Ｇ１期，继而诱导细胞产生凋亡。后两项结果均显示ｐＨＧＦ对人肝癌细胞凋亡的诱导里时间和剂量相关性。     

AC－cAMP－PKA途径对淋巴细胞DNA合成的调节作用

以ＣＤ３ＭｃＡｂ为激动剂，以淋巴细胞体外ＤＮＡ合成为研究手段，探讨了ＡＣ－ｃＡＭＰ－ＰＫＡ信号途径在ＣＤ３ＭｃＡｂ诱导的淋巴细胞活化中的意义。研究结果表明ＡＣ、ｃＡＭＰ和ＰＫＡ在决定细胞对外界刺激的反应中起着重要作用。在淋巴细胞活化早期细胞内ｃＡＭＰ出现一过性升高，随着细胞活化增殖，ｃＡＭＰ降至正常水平以下。活化ＡＣ、升高细胞内ｃＡＭＰ水平可显著降低ＣＤ３ＭｃＡｂ诱导的淋巴细胞ＤＮＡ合成，而ＰＫＩ却能在一定程度上促进淋巴细胞活化增殖。     

Fos oncoprotein expression in the rat forebrain following muscimol-induced absence seizures

Fos oncoprotein expression is a marker of neuronal activation following seizures. Here, using this method we examined the anatomical locations of muscimol-induced absence seizures in the rat forebrain. Six hours after a systemic injection of muscimol a massive Fos immunoreactivity appeared in the olfactory system, retrosplenial cortex and paraventricular thalamic nucleus, whereas other cortical areas contained low level of Fos expression. These results provide the first functional morphological evidence suggesting that these forebrain structures with Fos expression may play an important role in the pathophysiology of muscimol-induced absence seizures.     

慢性丙型肝炎时贮脂细胞的定量研究

应用免疫组化等方法，对慢性迁延性丙型肝炎肝组织中呈结蛋白阳性的贮脂细胞进行了定量的研究结果；结蛋白阳性的细胞数量与同阶段的乙型肝炎相比显著减少；电镜观察可见肝窦中有较多的枯否细胞，肝细胞间隙及窦周胶原纤维的沉积。我们认为，在丙型肝炎早期纤维化中，贮脂细胞可能并非主要导致纤维化的效应细胞，这和乙型肝炎有所不同。     

Human herpesvirus 8 (Kaposi's sarcoma-associated herpesvirus) infection in men receiving treatment for HIV-1 infection

OBJECTIVE: To determine the prevalence of human herpesvirus 8 (HHV-8) infection in men treated for HIV-1 infection in Denver, Colorado. DESIGN: Cross-sectional analysis METHODS: Blood samples were obtained from 216 HIV-1-infected men. Antibody to latency-associated nuclear antigen (LANA) was detected by an immunofluorescent assay and the presence of HHV-8 in peripheral blood mononuclear cells (PBMC) was detected by polymerase chain reaction amplification. RESULTS: Among HIV-1-infected men who did not have Kaposi's sarcoma (KS), prevalence of HHV-8 infection was 46% (95% confidence interval [CI], 0.39-0.52). LANA seropositivity was common both among subjects with KS and subjects without KS (69% versus 42%; p = .06), but detection of HHV-8 DNA in peripheral blood was strongly associated with a diagnosis of KS (44% versus 10%; p = .001). In a univariate analysis of study subjects without KS, neither the odds of LANA seropositivity nor detection of HHV-8 DNA in PBMC was significant for CD4+ lymphocyte count, HIV-1 virus load, the use of three drug antiretroviral regimens or the prior occurrence of non-KS AIDS-related conditions. CONCLUSION: Although antibodies to HHV-8 are common among HIV-1-infected men, detection of HHV-8 DNA in PBMC is uncommon and is associated with a diagnosis of Kaposi's sarcoma.     

Maslach倦怠量表-服务行业版在警察中的修订及应用分析

目的对Maslach倦怠量表-服务行业版(MBI-HSS)进行修订,并了解我国警察工作倦怠现状。方法采用MBI-HSS对4855名警察进行测试并对量表作出信、效度分析。结果修订后的量表保持原有的三维度结构,具有良好的结构效度(CFI=0.945,TLI=0.936,GFI=0.947,AGFI=0.930,NFI=0.942,IFI=0.945,RM-SEA=0.060),总量表和分量表的内部一致性信度、重测信度均大于0.70。综合三个维度的结果发现,男性警察的倦怠程度高于女性警察,警龄在6-15年的警察倦怠程度最严重,离异警察的倦怠程度高于已婚和未婚警察,学历低的警察倦怠程度较高。结论修订后的MBI-HSS可作为测量我国警察工作倦怠的有效工具。警察的工作倦怠在性别、警龄、婚姻状况、受教育程度方面存在差异。     

精液分析中精子密度室内质量控制方法研究

目的建立一种可行的精液密度测定的质量控制方法.方法采用血细胞计数板和计算机辅助精液分析(CASA)两种方法,对所选取的与精子头部直径相近的质控珠进行高、中、低三种密度测定,分别于日内及日间测试12次.结果采用血细胞计数板方法测试高、中、低三种密度结果的日内变异系数分别为12.09%、8.86%、4.72%,日间变异系数分别为16.71%、10.65%、10.22%.CASA法日内变异系数分别为6.65%、5.93%、3.80%,日间变异系数分别为7.90%、6.84%、6.14%.结论质控珠可用于以上两种测试精子密度方法的室内质量控制,从而达到保证实验室测试精子密度质量的目的.     

CLONING AND EXPRESSION OF cDNA FOR HUMAN LYMPHO-TOXIN

人淋巴毒素（ｈＬＴ）系由淋巴细胞经抗原或有丝分裂原活化后产生的一类细胞因子，它具有抗瘤、抗病毒活性和许多重要的免疫调节作用，是一种非常有前途的生物制剂。近年来发现的膜相关型淋巴毒素更提示ｈＬＴ可能具有尚未被揭示的免疫调节活性。因此，克隆人ＬＴｃＤＮＡ并在大肠杆菌表达重组ｈＬＴ，对于ｈＬＴ的开发利用和研究其功能都具有重要意义。本实验按照公布的ｈＬＴｃＤＮＡ序列，经计算机分析并结合实验要求设计并合成一对ＰＣＲ引物，采用ＲＴ－ＰＣＲ技术从ＰＨＡ／ＰＭＡ活化２４ｈ的人Ｔ细胞系Ｊｕｒｋａｔ细胞总ＲＮＡ扩增出一５４１ｂｐＤＮＡ片段；经α－互补筛选，质粒小量快速抽提，限制性内切酶酶切鉴定，将该片段定向克隆于ｐＵＣ１８、ｐＵＣ１９质粒载体。限制性内切酶图谱分析和Ｓａｎｇｅｒ双脱氧链终止法序列测定表明：该ＤＮＡ片段与公布的人淋巴毒素ｃＤＮＡ序列完全一致。它包括编码人淋巴毒素成熟肽的全部ｃＤＮＡ序列。再进一步将该ｃＤＮＡ片段克隆于原核表达载体ｐＢＶ２２０，经地高辛标记探针菌落原位杂交筛选，限制性内切酶酶切鉴定方向，筛选出一阳性重组子ｐＢＶ－ｈＬＴ。ＳＤＳ－ＰＡＧＥ和Ｗｅｓｔｅｒｎｂｌｏｔｉｎｇ分析表明：经温控诱导，该重组菌成功     

Fast- and slow-twitch isoforms (SERCA1 and SERCA2a) of sarcoplasmic reticulum Ca-ATPase are expressed simultaneously in chronically stimulated muscle fibers

 Using an immunohistochemical double-labeling technique, we observed that different isoforms of sarcoplasmic reticulum Ca-ATPase are co-expressed in single fibers of canine fast-twitch skeletal muscles stimulated chronically at low frequency. By 7 days of neuromuscular stimulation, the population of hybrid fibers expressing both SERCA1 and SERCA2a [fast- and slow-twitch isoforms of sarco(endo)plasmic reticulum Ca²⁺-ATPase] had increased from 1.5% to 9.2% of fibers. By 14 days of stimulation 90% of the pure fast-twitch fibers (expressing only SERCA1) were replaced by hybrid fibers. An additional 28 days of stimulation caused all fast-twitch fibers to express SERCA2a at the same level as found in nonstimulated slow-twitch fibers (expressing only SERCA2a). At this time, one-half of the previously hybrid fibers had become pure slow-twitch fibers. The remaining one-half of the hybrid fibers expressed SERCA1 at a very low level. Extending stimulation to 70 days did not further change the percentage of fibers that were slow-twitch or hybrid. Immunoblot studies at the whole-muscle level confirmed that changes in SERCA expression at 42 days of neuromuscular stimulation were complete. Immunohistochemical analysis of longitudinal sections of muscle showed that the changes in SERCA protein were uniform along the length of the muscle fiber, indicating that nuclei along its length responded equally to chronic stimulation. Received: 12 November 1996 / Received after revision and accepted: 16 December 1996     

不同患者手术前后血中IL-2/sIL-2R系统的动态变化

本文研究28例胆囊炎胆石症、结肠癌和直肠癌患者手术前后血中IL-2/sIL-2R系统的动态变化。分别于手术前或当晨,术后1、2～3、5～7d抽血,测定血中IL-2、sIL-2R量,同时作CRP试验。结果表明,施行中等手术胆囊摘除总胆管切开引流术和半结肠切除术对IL-2/sIL-2R系统的影响与患者术前的水平有关。原先异常程度或轻或重,术后影响亦或轻或重,但均未见统计学差异。3例直肠癌患者施行miles氏手术,术后出现明显IL-2量下降,sIL-2R量增高,持续时间长。因此,初步说明创伤大的手术在一定程度上影响机体的IL-2/sIL-2R系统。并可从中发现规律,采取措施,具有一定的临床价值。