血小板活化因子对小鼠巨噬细胞受体结合及产生IL-1的探讨

本文探讨了血小板活化因子对硫乙醇酸钠刺激产生的小鼠腹腔巨噬细胞受体结合及产生白细胞介素1的状况。用PAF对~3H-PAF竞争结合实验,测定出对TG-Mφ膜结合的IC50,在20℃为8.5×10~(-9)M,0℃为9.7×10~(-9)M,两者无明显区别;而对TG-Mφ完整细胞的结合。在20℃为6.5×10~(-9)M,0℃为10.5×10~(-9)M,随温度的增高,IC50减小。NaCl有降低~3H-PAF特异结合的能力,IC50为7.5mM。PAF能够刺激TG-Mφ产生白细胞介素1,在10~(-3)M浓度较为明显,和对照组相比,P<0.05。     

人绒毛膜促性腺激素（HCG）的生物电化学免疫测定

本文介绍了在玻璃碳电极上共价结合HCG抗体的免疫电极。采用循环伏安法测定了免疫电极的循环伏安图谱。当电极上抗体与抗原发生反应，形成抗原-抗体络合物后，循环伏安曲线的阴极峰电流发生变化。根据阴极峰电流的变化，可以测定溶液中HCG的含量，测定的浓度范围为5．0×10^-8～5．0×10^-6。克／毫升。     

人血管内皮细胞存在尿激酶受体u-PA及PMA引起的受体调变

尿激酶为体内一种纤溶酶原激活因子,在血栓溶解及血栓病的治疗中起了重要作用。同样,血管内皮细胞在凝血和纤溶中也起着重要作用,它们两者关系如何?本实验通过体外培养人脐带静脉内皮细胞,用标记的~(125)Ⅰ-尿激酶进行放射结合分析。本实验发现,脐带静脉内皮细胞上存在尿激酯受体,每个细胞上尿激酶最大结合位点为1.4×10~6个,解离常数Kd值为7.5×10~(-12)M;经过PMA作用后,每个细胞上最大结合位点上升至2.2×10~6个,解离常数Kd上升至9×10~(012)M。证明人脐带静脉内皮细胞上存在尿激酶受体,PMA可促进尿激酶受体在培养内皮细胞上的表达,而解离常数Kd值变化不大。     

抗心绞痛药-尼可地尔强化异丙肾上腺素引起大鼠主动脉松驰作用:与cGMP抑制性cAMP磷酸二酯酶的关联

作者观察了尼可地尔对异丙肾上腺素(ISO)引起的大鼠主动脉环松弛作用的影响;发现:ISO(10~(-9)～3×10~(-6)mol/L)可以使苯肾上腺素(3×10~(-7)mol/L)引起收缩的大鼠主动脉环松弛。用尼可地尔(3×10~(-7)mol/L～3×10~(-6)mol/L)进行预处理,ISO的作用被强化,而克罗卡林则无此作用。尼可地尔亦能加强佛司可林(3×10~(-9)mol/L～10~(-6)mol/L)及双丁酰环磷腺苷(3×10~(-6)mol/L,3×10~(-4)mol/L)的血管     

大鼠抗人血红蛋白单克隆抗体的制备及其特性定鉴

将人血红蛋白(Hb)免疫LOU/M(IgK-1a)大鼠,取脾细胞与IR983F大鼠骨髓瘤细胞融合,制备了3株大鼠抗Hb单克隆抗体(McAb)2A10、9B5,4F12杂交瘤细胞株。3种McAb腹水效价分别为1:16×10~4、1:3.2×10~4、1:323×10~4。培养上清效价分别为1:256、1:16、1:8。亚类测定分别为IgM、IgG2_a、IgG2_4、染色体记数2A10为60±5,9B5为72±6。3种McAb的亲和常数分别为1.28×10~6M~(-1)、6.35×10~7M~(-1),3.64×10~8M~(-1)。特异性检测表明3种McAb与人Hb及人红细胞的亲和力明显高于其它种类动物的红细胞,与无关蛋白无结合活性。用这些McAb检测Hb最低可测到1υg水平,检测人红细胞可检测到4～8个RBC/ml(相当于90～190ngHb/ml)。大大高于目前临床常用的测定潜血方法。     

一种平行—培养皿流动室用于细胞对固体表面的吸附力研究

作者报道了人体皮肤成纤维细胞在一种新型平行—培养皿流动室,分流层,细胞吸附和分离的情况。在平行-培养皿顶部为甲基丙烯酸甲酯把两个平皿隔开,相互通过上面涂有镍的7.6×5.0×0.2cm(1×w×h)两个空间,室的容积效应为7.6×3.8×0.02cm(1×w×h)。在研究过程中计算室中心变速压力,通过摄像系统分析,测定细胞周长、形状与传播范围。把人体成纤维细胞放入25cm~2和75cm~2T型长颈瓶中,37℃5%CO_2培养,其中含Hepes-缓冲液RPMI1640培养基、2mM谷酰胺、100IU/ml青霉素/链霉素、10%胎牛血清。细胞经过胰酶消化,稀释成10~5/ml,取5ml     

AM及其抑制剂对人卵巢癌细胞株(CAOV3)PKB活性的影响

目的探讨肾上腺髓质素(Adrenom edullin,AM)及AM受体阻断剂(AM22-52)对人卵巢癌细胞株CAOV3蛋白激酶B(PKB)活性的影响。方法以不同浓度的AM和AM22-52诱导CAOV3细胞,利用Western印迹方法,测定PKB活性的变化。结果AM和AM受体阻断剂AM22-52对t-PKB(total-PKB)的表达量均无明显影响;随着AM浓度(1×10-9～1×10-6mol/L)的增加,CAOV3细胞p-PKB活性随之升高,呈剂量依赖关系;AM受体阻断剂AM22-52(1×10-9～1×10-6mol/L)抑制CAOV3细胞内p-PKB活性,也呈剂量依赖效应。结论AM激活CAOV3细胞内的PKB信号通路,AM22-52可有效阻滞此传导途径,为卵巢癌的生物治疗提供新的思路。     

抗酸性同功铁蛋白重组免疫细胞因子的制备及其特性研究

目的构建并表达抗酸性同功铁蛋白(acidicisoferritin,AIF)的免疫细胞因子,并研究其抗肿瘤特性。方法在克隆小鼠趋化因子CXCL10全长基因的基础上,构建抗AIF单链抗体与CXCL10组成的重组免疫细胞因子,并在小鼠骨髓瘤细胞NSO中进行表达;使用流式细胞技术(FCM)和体外细胞趋化试验等方法来研究该重组蛋白的抗肿瘤特性。结果重组免疫细胞因子(IP10scFv)真核表达产物的相对分子质量(Mr)约为41.1×103,纯化后的蛋白浓度为68mgL,抗体亲和常数(KDIP10scFv)为2.28×10-8molL。IP10scFv能够特异识别分泌AIF的SMMC7721细胞,并能与激活后的小鼠T淋巴细胞表面CXCR3受体特异性结合,对小鼠激活的T淋巴细胞有较强的趋化作用。结论成功地制备了抗AIF单链抗体与趋化因子CXCL10构成的重组免疫细胞因子,该免疫细胞因子是肿瘤治疗的潜在制剂。     

UK-68,798对家兔心脏房室结区不同细胞的电生理作用

在离体家兔房室结(AVN)区标本上,用微电极技术研究了Ⅲ类抗心律失常新药UK-68,798对AN、N、NH、H 4种细胞的电生理效应。浓度为5×10~(-9)至5×10~(-6)mol的UK-68,798对上述4种细胞的APA、RP皆无影响,对AVN的自搏频率有剂量依赖性减慢作用但不改变A-H传导时间.在5×10~(-8)～5×10~(-6)mol的剂量范围,UK-68,798使APD_50和APD_(90)发生剂量依赖性延长.4种细胞中以N细胞的APD_(50)和APD_(90)延长百分率最高。各类细胞APD_(90)延长百分率依大小排列,其次序为N>AN>H>NH.例如当浓度为5×10~(-6)mol时4类细胞APD_(90)的延长百分率分别为95±26％(N)、75±22％(AN)、63±26％(H)、46±     

石英表面吸附血纤维蛋白元的分子结构及吸附作用

对于固体表面蛋白吸附的过程,在产生表面血栓形成的血浆蛋白生理功能中起着重要的一步。吸附于固体表面的纤维蛋白元显示促进血小板粘连,作者根据非吸附材料的可能性。研究了纤维蛋白元对固体材料的吸附。为了阐明在石英表面吸附纤维蛋白元的吸附等温线和结构,运用了三个测量方法,椭园对称术,酶标免疫吸附剂检查术测量石英表面纤维蛋白元的吸附作用。通过电镜计算吸附分子数。用ELISA确定低浓度中最初吸附限定扩散率,从椭园对称术、ELISA和电镜测量中发现在容积浓度为55×10~(-7)的亲水性石英面积和容积浓度为1×10~(-3)M疏水面最低可测表面纤维蛋白元吸附浓度,这种吸附纤维蛋白元表面吸附浓度随容积浓度增加而增加,无任何恒定饱和水平。在亲水性表     

局部注射辛伐他汀对骨质疏松大鼠股骨髁骨小梁的改建效应

背景：局部注射具有成骨作用的辛伐他汀,可显著增加骨质疏松大鼠股骨颈及股骨髁部的骨密度及力学强度,分析局部注射辛伐他汀对股骨髁骨小梁的影响。 目的：进一步研究骨质疏松大鼠股骨内局部注射辛伐他汀对股骨髁骨小梁的影响。为将辛伐他汀应用于临床骨质疏松局部治疗提供实验基础。 方法：18只雌性SD大鼠双侧卵巢切除后3个月,制备大鼠骨质疏松模型。实验大鼠随机数字表法均分为3组,分别在实验大鼠的右侧股骨髓腔内单次注射辛伐他汀溶液5 mg、10 mg,对照组单纯注射空白载体。分别在注射后1个月处死大鼠并取材。Micro-CT扫描并定量分析骨组织形态变化。 结果与结论：给药后1个月,Micro-CT扫描结果显示,辛伐他汀治疗组的骨微结构参数如骨皮质厚度、骨小梁密度及连接率明显优于对照组。说明疏松骨骼单次注射小剂量辛伐他汀可显著促进股骨髁部骨小梁改建,改善骨骼微结构,可为强化局部、防治骨质疏松骨折的新选择进一步提供实验基础。     

Assessment of the efficacy of treatment of hemangiomas

Assessment of the aftereffects of cryoexposure and ultrahigh-frequency cryoexposure on hemangioma tissue of various types, cavernous and squamous, showed a higher cryogenic effect in hemangiomatous tissue preexposed to ultrahigh-frequency waves. A quantitative criterion is proposed for assessing the efficacy of the studied methods of exposure. Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 119, N ^o 6, pp. 669–672, June, 1995     

Level of functioning of siblings and parents of probands of varying degrees of retardation

A further analysis of already published data supports the position that retardates of low ability level less frequently have retarded siblings, retarded parents, and parents low in occupational level than do retardates higher in ability level. The analysis supports the position that there are two types of retarded individuals, persons retarded as a result of gene or chromosomal anomalies, brain injury, etc., who more frequently occur in the lower-level retardate group, and persons whose retardation represents polygenic segregation, who more frequently occur in the higher-level group.     

侧脑室注射链脲佐菌素对大鼠海马神经元突触的影响

为观察链脲佐菌素(streptozotocin,STZ)双侧侧脑室注射对大鼠海马神经元突触的影响,本研究将Wistar大鼠随机分为对照组和模型组,模型组大鼠分别于第1、3d双侧侧脑室重复注射STZ3mg/kg,对照组以人工脑脊液代替STZ。21d后,取大鼠海马,免疫组织化学染色及Western blotting方法观察突触素、活性调节细胞骨架相关蛋白(activity-regulated cytoskeletal-associatedprotein,Arc)的表达;电镜观察海马CA1区神经元突触超微结构的改变。结果显示:与对照组相比,模型组大鼠海马内突触素蛋白表达显著减少,而Arc蛋白表达显著增多;模型组海马CA1区神经毡内突触结构异常,突触小泡聚集增多。以上结果提示:脑室注射STZ可影响大鼠海马突触相关蛋白的表达,引起突触超微结构异常,干扰了神经元突触信号的传导。     

Effect of conditions of culture on quantitative assessment of viability of living tissues

The viability of tissue explants of mouse kidneys, estimated quantitatively by growth in plasma-free culture, was shown to depend on several factors connected with the conditions of culture. The effect of methods of treatment of the serum, pH of the medium, and the character of distribution of the tissue explant during culture, the size of the explants, and the firmness of attachment of the tissue fragments to the substrate on this index was demonstrated.Problem Laboratory, Arkhangel'sk Medical Institute. (Presented by Academician of the Academy of Medical Sciences of the USSR A. P. Avtsyn.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 86, No. 11, pp. 629–631, November, 1978.     

社区精神分裂症病人照料者的生活质量研究

通过对９３名精神分裂症患者的家庭照料者与１００名对照者比较研究表明，照料者的躯体功能、心理功能、社会功能与经济状况都显著差于对照者。照料者的生活质量与被照料者的病期、病情严重度、整体功能、药物副作用有关；同时，照料者身份为患者母亲者其生活质量受影响最大。     

Evaluation of fungicidal activity of extracellular filtrates of cyanobacteria--possible role of hydrolytic enzymes

A set of seventy axenised and unicyanobacterial isolates belonging to the genus Anabaena were evaluated for biocidal activity against a set of phytopathogenic fungi. Among them, 35 Anabaena strains showed zone of inhibition against one or more fungi. The extracellular filtrates from 4 and 8 weeks old cultures of these Anabaena strains were further evaluated in terms of hydrolytic enzymes, proteins and IAA employing standard methods. Significant differences were also observed among the strains in terms of their FPase, chitosanase and xylanase activity, while low and relatively similar values of CMCase, cellobiase and protease activity were recorded in the strains analyzed. IAA production was also observed in all the strains. Comparative evaluation of activity of hydrolytic enzymes and antifungal activity revealed that such enzymes may contribute to the fungicidal activity of the cyanobacterial strains, besides other bioactive compounds, including IAA, which are established promising traits for biocontrol agents. This study is a first time report on the production of hydrolytic enzymes by these oxygenic photosynthetic prokaryotes, which can be potential candidates for the development of biocontrol agent(s) against selected phytopathogenic fungi.     

Effect of ultralow doses of thyroliberin on microviscosity of lipid components of biological membranes

Effects of the regulatory peptide thyroliberin on microviscosity of lipid components of endoplasmic reticulum biological membranes in mouse hepatocytes were studied by electron paramagnetic resonance. Thyroliberin in a concentration of 10⁻³–10⁻¹⁸ M decreased microviscosity of surface layers of membrane lipids. This decrease was the most pronounced (30%) under effects of 10⁻¹⁰ and 10⁻¹⁶ M thyroliberin. Physiological effects of thyroliberin corresponded to its influence on the membrane structure. Translated fromByulleten' Eksperimental'noi Biologii i Meditsiny, Vol. 129, No. 1, pp. 38–40, January, 2000     

Effect of route of antitoxin administration on efficacy of treatment of experimental tetanus

The efficacy of treatment with Diaform-3 antitoxin, given by either intracisternal or intralumbar injection in a dose of 400 i.u./kg, was compared in experiments on 100 rabbits with ascending, hematogenous, and cerebral tetanus caused by injection of 1 c.l.d. of tetanus toxin. Intracisternal injection of the antitoxin was found to be three times more effective than intralumbar (the proportion of animals cured was 31.4 and 10.2% respectively). The latter was effective only in animals with ascending tetanus, evidently because the portal of entry of the toxin into the CNS was along the peripheral nerves of the hind limbs.Central Research Laboratory, L'vov Medical Institute. (Presented by Academician of the Academy of Medical Sciences of the USSR A. M. Chernukh.) Translated from Byulleten' Éksperimental'noi Biologii i Meditsiny, Vol. 86, No. 8, pp. 212–213, August, 1978.