4种腹足纲动物粗蛋白的凝集作用

采用来自5种脊椎动物的8种血细胞、7种微生物单细胞、5种藻类细胞，对4种海产腹足纲动物凝集素进行筛选，均检测到凝集活性。绵羊红细胞、啤酒酵母、紫球藻对凝集反应最为敏感。4种动物凝集素普遍不耐高温，60℃或65℃下15min即全部失活，凝集反应的适宜pH为6．5-8．0，其凝集性能可能分别被不同的糖所抑制，但均可被0．02mol／LEDTA抑制。     

富勒醇-FITC磷光标记固体基质室温磷光法测定痕量碱性磷酸酶

开发了新的富勒醇、异硫氰酸荧光素和N,N-二甲基苯胺（F-ol-（FITC）n-DMA）标记试剂.基于F-ol的活性-OH与FITC游离的-COOH反应生成含有多个FITC分子的复合物（F-ol-（FITC）n-DMA）,增加WGA-AP-WGA-F-ol FITC-DMA（WGA和AP分别为麦胚凝集素与碱性磷酸酶）生物靶的发光分子数而进一步提高SSRTP（固体基质室温磷光法）的灵敏度.用F-ol-（FITC）n-DMA标记WGA方法的检出限为0.15 ag spot-1（F-ol）与0.097 ag spot-1（（FITC）,比F-ol-DMA、FITC-DEA单发光分子标记WGA方法的检出限（0.20 ag spot-1（F-ol）,0.22 ag spot-1（FITC）低.用于血清试样中AP含量的测定结果与酶联免疫法相吻合.     

Differential binding of conA and WGA on the cell surface,the role of sialic acid in their expression and the increased activity of sialidase after cis-Platin treatment

Summary It is reported that concanavalin A (conA) and wheat germ agglutinin (WGA) have a differential binding pattern on normal mouse spleen lymphocytes and the surface of Dalton's lymphoma cells. It is suggested that sialic acid on the cell surface controls the expression of lectin binding sites. Further, it has been observed that the increased release of sialic acid from cell surfaces aftercis-dichlorodiammine platinum (II) (cis-Platin) treatment is due to the increased activity of sialidase.To whom reprint requests should be addressed.     

大豆凝集素的分离纯化及活性鉴定

以D-半乳糖胺为配基、 FF-sepharose 4B为固定相, 制备大豆凝集素亲和层析填料. 分离和纯化大豆中的大豆凝集素蛋白, 测定其纯度、 免疫原性和凝集活性, 并与美国Sigma公司的标准品比较. 结果表明： 每毫升GalN-FF-Sepharose-4B层析填料能结合10 mg大豆凝集素; 纯化获得的大豆凝集素分子量为30 000; SDS-PAGE测定纯度大于98%; Western blot结果为阳性; 1 mg/mL SBA血集效价为1/2^10; 其纯度、 免疫原性和凝集活性等指标与大豆凝集素标准品相同, 与理论值相符.     

温度、酸碱度和变性剂对黄花石蒜凝集素活性和构象的影响

采用荧光光谱研究了不同温度、pH和变性剂对黄花石蒜凝集素（Lycoris aurea agglutinin,简称LAA）凝血活性和分子构象的变化关系,结果表明：LAA具有较强的温度和酸碱度的耐受性,经过3种变性剂的处理都能使LAA分子构象发生不同程度的变化并导致活性的丧失,浓度为6 mol/L的盐酸胍和脲,20 mmol/L的SDS可以使LAA完全丧失凝血活性,荧光光谱的变化表明了这种变性过程具有阶段性.     

一种新的室温燐光法及其分析应用

提出一种新的4代树枝状分子（4G—D）-曲拉通-100X（Triton-100X）燐光标记试剂．基于Triton-100X-4G-D标记的麦胚凝集素（WGA）的产物（Triton-100X-4G-D—WGA），能与碱性燐酸酶（ALP）发生两种（直接法和夹心法）特异性亲和吸附反应（AA），其AA的产物仍然保持4G-D室温燐光的优良性质，且AA产物的△Ip值与ALP的含量成线性关系，据此建立了Triton-100X-4G—D标记麦胚凝集素-亲和吸附固体基质室温烧光法（AA—SS—RTP）测定痕量ALP的新方法．该方法的检出限为0．20ag spot^-1（直接法，对应浓度：5．0×10^-18 mol L^-1）、0．14ag spot^-1（夹心法，对应浓度：3．5×10^-18 mol L^-1），灵敏度高，重现性和精密度好．直接法和夹心法用于血清中ALP含量的测定，与漳州市中医院ELISA法临床检测的结果相吻合．     

Application of an Optical Biosensor to Study the Interaction between Porphyrins and Wheat Germ Agglutinin

0Introduction Porphyrinderivativeshavebeenusedasphotosensitizersinphotodynamictherapy(PDT),anewapproachdevel opedforthetreatmentofcancer[1].Cationwater solublepor phyrinsareofconsiderableinterestowingtotheirpossiblebio medicalapplications[2].Inwhich,theinhibiteffectonthe growthmetabolismofE.coliandcancercellHL60ofmeso tetra(4N ethylacetatepyridyl)porphyrin(H2NEAE pp)and itsZn(Ⅱ)complexform(ZnNEAE pp)havebeenrecentlyin vestigated[3,4].Toenhancetumor locationandanticancerac tivitiesofdr…     

亲和吸附固体基质室温燐光法测定痕量糖

在外重原子微扰剂Pb（Ac）2存在下,异硫氰酸荧光素（FITC）的SiO2纳米微球（简写作FITC—SiO2）在醋酸纤维素膜（ACM）上能发射强而稳定的室温燐光（room temperature phosphorescence,简称RTP）信号．由FITC-SiO2标记的麦胚凝集素（Triticum vulgate lectin,简称WGA）产物（FITC-SiO2-WGA）,不仅仍能在ACM上与萄萄糖（glucose,简称G）发生定量的特异性亲和吸附（affinity adsorption,简称AA）反应,且AA反应产物（WGA-G—WGA-FITC-SiO2）能发射更强的RTP信号,其△Ip值与G的含量成线性关系,据此建立了FITC-SiO2标记WGA-AA固体基质室温燐光法（affinity adsorption solid substrate-room temperature phosphorimetry,简称AASSRTP）测定G的一种新方法．按3Sb／k计算,本方法的检出限（LD）为0．47pg spot^-1（对应浓度为1．2×10^-9m L^-1,即5．3×10^-9 mol L^-1）,灵敏度高,用本法和G氧化酶法对比测定了血清试样中G的含量,结果相吻合．同时讨论了AASSRTP测定G的反应机理．     

Isolation and characterization of hemagglutinins from the spongeDysidea herbacea

Summary The spongeDysidea herbacea (Keller) was found to possess hemagglutinins. The major component, DHA-I, is a protein with a mol.wt of 26,000, which dissociates into subunits of equal size (14,000). It contains large amounts of glutamic acid and aspartic acid residues, but no half-cystine, methionine or histidine residues. DHA-I reacted with rabbit and human AB0 erythrocytes. D-galactose and lactose were effective inhibitors of DHA-I. The sponge also contained a minor component(s) which reacted preferentially with rabbit erythrocytes but not with human AB0 erythrocytes.Acknowledgment. We thank Dr. M. Yamazaki, Faculty of Pharmaceutical Sciences, Teikyo University, for testing mitogenic activity ofDysidea agglutinins. This study was partly supported by a grant-in-aid for Overseas Scientific Survey from the Ministry of Education, Science and Culture, Japan.     

蓝桉果免疫调节作用的实验研究

目的探讨蓝桉果对小鼠巨噬细胞吞噬功能、免疫器官及抗体生成的影响.方法采用腹腔巨噬细胞吞噬测定方法、免疫器官重量法及凝集素测定方法,观察吞噬百分率、吞噬指数、胸腺指数和脾脏指数、血清凝集素的生成.结果蓝桉果溶液具有增强小鼠腹腔巨噬细胞吞噬功能的作用,能明显增加小鼠免疫器官的重量和明显提高小鼠血清凝集素水平的作用.结论蓝桉果在调动机体免疫系统机能方面有一定的促进作用.