CⅡTA M1-RNA对MHCⅡ类分子表达的抑制作用

目的探讨MHCⅡ类分子转录激活因子（CⅡTA）的M1-RNA对细胞表面MHCⅡ类分子表达的抑制。方法M1-RNA是核糖核酸酶P的催化活性单位，设计并克隆针对CⅡTA第452、629位点的M1-RNA（分别为M1-452-GS、M1-629-GS）及其相应的CⅡTA靶基因，分别插入pUC19、pGEM-7zf（＋）载体，进行细胞外切割活性筛选。将细胞外切割作甩明显的M1-629-GS亚克隆入psNAV载体（psNAV-M1-629-GS，pA629）并稳定转染ECV304细胞株，流式细胞术检测经典的MHCⅡ（HLA-DR、-DP、-DQ）类抗原表达，RT-PCR检测CⅡTA的mRNA水平。结果pA629阳性ECV304细胞株与对照组比较，HLA-DR、-DP抗原表达分别降低了89．21％及92．31％；同时CⅡTA的mRNA含量降低（P〈0．05）。结论CⅡTA的M1-RNA（M1-629-GS）降低了自身mRNA含量，从而阻止其调控的MHCⅡ类分子的表达。     

Recombinant gp120 induces IL-10 in resting peripheral blood mononuclear cells; correlation with the induction of other cytokines.

Immunological abnormalities present in HIV-1-infected individuals often reflect an imbalance of cytokine production. The HIV-1 gp120 has the ability to induce a number of cytokines, and to enhance immunoglobulin release by normal peripheral blood mononuclear cells (PBMC) in vitro, in the absence of IL-2 production and of lymphoproliferation. This study provides evidence that gp120 is a potent IL-10 inducer in normal PBMC cultures. The pattern of other cytokines induced by gp120 includes interferon-alpha (IFN-alpha) and IFN-gamma, tumour necrosis factor-alpha (TNF-alpha), IL-6, IL-1 alpha and -beta, and not IL-2 and IL-4. These findings further define the pattern of cytokine release induced by gp120 on human resting PBMC. Furthermore, the present findings roughly parallel those observed both in the sera of patients and in the mononuclear cells from HIV+ individuals early after infection, suggesting that gp120 could be a good candidate as one of the agents responsible for cytokine dysregulation observed in HIV-1-infected individuals.     

红细胞分化调节因子对体外培养的L929和KB细胞的生长抑制作用

从兔网织红细胞提纯的红细胞分化调节因子(erythroid differentiation factor,EDF),能对体外培养的自发转化成纤维细胞系L929及人鼻咽癌细胞系KB产生作用。当EDF剂量为0.10μg/ml时,可引起L929细胞形态发生改变,并有细胞核固缩现象。第2d的细胞生长抑制率为64.86％,软琼脂集落形成率为0;第5d时细胞增殖为负值。~3H-TdR掺入率明显降低。EDF剂量为0.15μg/ml时,对KB细胞生长已有抑制作用。EDF剂量达0.30μg/ml时,生长抑制明显。以上结果证明了EDF对恶性细胞具有增殖抑制作用。这种作用对不同种类细胞敏感性不同,并且与剂量呈正相关。     

川芎嗪对内毒素脂多糖诱导的体外血脑屏障模型通透性增高的保护作用及其机制

目的:探讨川芎嗪对内毒素脂多糖(LPS)诱导的体外血脑屏障模型通透性增高的保护作用及其调控机制。方法:利用脑微血管内皮细胞与星型胶质细胞共培养建立体外大鼠血脑屏障模型,随机分为正常对照组、川芎嗪对照组、LPS干预组和川芎嗪治疗组。采用γ计数仪检测~(125)I-BSA通透量观察体外血脑屏障模型通透性的改变,Western印迹法检测紧密连接蛋白(zonula occludens-1,ZO-1)表达量的变化。结果:LPS使体外血脑屏障模型对~(125)I-BSA的通透量明显增加,脑微血管内皮细胞ZO-1蛋白表达下降,川芎嗪治疗组能明显拮抗LPS的上述作用。结论:川芎嗪对LPS诱导的体外血脑屏障通透性增高具有保护作用,其机制与它能影响血脑屏障紧密连接蛋白ZO-1表达有关。     

Human sperm chemotaxis: both the oocyte and its surrounding cumulus cells secrete sperm chemoattractants

BACKGROUND: Human sperm chemotaxis to pre-ovulatory follicular fluid is well established in vitro. However, it is not known whether the female's oocyte-cumulus complex secretes sperm chemoattractants subsequent to ovulation (for enabling sperm chemotaxis within the Fallopian tube) and, if so, which of these cell types--the oocyte or the cumulus oophorus--is the physiological origin of the secreted chemoattractant. METHODS: By employing a directionality-based chemotaxis assay, we examined whether media conditioned with either individual, mature (metaphase II) human oocytes or the surrounding cumulus cells attract human sperm by chemotaxis. RESULTS: We observed sperm chemotaxis to each of these media, suggesting that both the oocyte and the cumulus cells secrete sperm chemoattractants. CONCLUSIONS: These observations suggest that sperm chemoattractants are secreted not only prior to ovulation within the follicle, as earlier studies have demonstrated, but also after oocyte maturation outside the follicle, and that there are two chemoattractant origins: the mature oocyte and the surrounding cumulus cells.     

我国脑膜炎奈瑟菌孔蛋白PorA、PorB的多态性分析

目的以蛋白质组学研究为基础,分析2003—2005年我国流脑暴发流行期间C群脑膜炎奈瑟菌菌株特征,建立以致病性相关蛋白多态性为目标的新分型方法。方法利用双向电泳和MALDI-TOF质谱鉴定分析2003—2005年流脑流行期内分离的66株C群脑膜炎奈瑟菌菌株及2株参考菌株的蛋白表达,重点分析与致病性相关的蛋白多态性特征。结果根据孔蛋白PorA、PorB在双向电泳中的多态性,建立了12个特征菌型。安徽菌株的PorA和PorB蛋白电泳谱型显示出了高度的一致性,而其他地区的菌株则显示出高度的多态性。结论PorA和PorB蛋白2-DE电泳谱型可以作为一种新的菌株分型方法,可能在菌型变迁检测和流脑暴发预警中具有重要应用前景。     

医用磷酸钙骨水泥的制备及性能的实验研究

探索了磷酸四钙（Ca4（PO4）2O，TTCP）的制备，并合成了磷酸钙骨水泥（CPC），对CPC固化时间、引起浸泡液pH值的变化、抗压强度、产物物相组成及微观结构进行了研究。结果表明：在真空条件下、1500℃下煅烧6h可制得TTCP，并含有少量CaO。CPC初凝时间为4min、终凝时间为15min，浸泡1d和7d后的抗压强度分别为20MPa和35MPa，浸泡液的pH值在6．4～8．9之间变化，这些性能均符合临床用CPC的性能要求。CPC水化产物为片状或针状羟基磷灰石（Ca5（PO4）3OH，HA），相互交错呈连续分布的网状结构，这种结构有利于材料强度的提高。实验研制的CPC材料可用于骨缺损的修复治疗。     

胸腰脊神经根鞘形态观测及其临床意义

目的：为了探讨腰腿疼痛等疾病与脊神经根鞘的关系。方法：用巨视解剖和游标卡尺测量法对１５具尸体的胸腰脊神经根鞘进行了解剖学观察与测量。结果：①左、右胸腰脊神经根鞘长度和横径基本对称；②Ｔ１根鞘长度和横径大于其它胸神经根鞘，接近Ｌ２水平，Ｌ３～Ｌ５根鞘长度和横径大于其它胸腰神经根鞘，尤其Ｌ５更为突出；③胸腰脊神经根鞘开口式，由上向下，由２～３孔逐渐减至１孔。结论：①Ｔ１、Ｌ２～Ｌ５脊神经根鞘既长又粗，与周围接触范围大，受损危险增大；②根鞘开口式孔数由上向下减少，发生在鞘内的炎症和肿瘤引起前、后根同时受累的机会增多。     

Separate and variably shaped chromosome arm domains are disclosed by chromosome arm painting in human cell nuclei

Fluorescence in situ hybridization (FISH) with microdissection probes from human chromosomes 3 and 6 was applied to visualize arm and subregional band domains in human amniotic fluid cell nuclei. Confocal laser scanning microscopy and quantitative three-dimensional image analysis showed a pronounced variability of p- and q-arm domain arrangements and shapes. Apparent intermingling of neighbouring arm domains was limited to the domain surface. Three-dimensional distance measurements with pter and qter probes supported a high variability of chromosome territory folding.     

P-gp、GSTπ及TopoⅡ在胃癌中的表达及临床意义

目的：探讨耐药基因蛋白P-gp、GSTл和TopoⅡ在胃癌中的表达及其临床意义。方法：应用S-P免疫组化法对85例胃癌进行检测。结果：胃癌组织P-gp、GSTл表达率分别为37.65%及63.53%，表达强度与临床分期有关，其中高分期者P-gp表达较低分期者为高。TopoⅡ表达率为55.29%，阳性率与组织学分类相关，分化较低者（59.57%）较分化较高者（38.30%）阳性率高。结论：P-gp、GSTл、TopoⅡ的耐药机制各不相同，根据P-gp、GSTл和TopoⅡ表达情况进行耐药物选择对办癌化疗具有重要的指导意义。