Malaria vaccine

Summary Among infectious diseases caused by protozoa, malaria is still the greatest killer of children. Mortality in adults living in endemic areas is significantly lower because they frequently acquire partial or complete immunity to the major pathogen,Plasmodium falciparum. This natural protection indicates that vaccination may be possible, and the first candidate antigens were cloned with the use of human immune sera as probes. Genetic and biochemical analysis of the parasite proteins revealed that they are polymorphic, and frequently gene sequences were discovered which were specific for a particular parasite isolate, which eliminated most antigens for purposes of vaccine development. The most promising candidate antigens today are the major surface proteins of sporozoites and blood stage parasites. However, the immune response against those is not sufficient for complete protection, and additional, intensive research is necessary to identify new molecules to be included in a vaccine cocktail against malaria. The current spread of the disease due to increasing drug resistance of parasites and mosquito vectors emphasizes the urgent need for a vaccine.     

R0(SS-A)抗原的纯化

本文以猪脾细胞浆为原料,采用制备电泳方法纯化了RO抗原。纯化的样品在PAGE上呈现单条区带,通过凝胶过渡测定分子量约为80KD,在SDS-PAGE上主要表现为60KD多肽带,Western blotting证明此60KD即为RO抗原的活性多肽。     

Cytotoxicity of human peripheral blood T-lymphocyte clones activated by hepatitis B virus surface antigen

Summary The present studies examined the cytotoxic activities of peripheral blood lymphocytes (PBL) from volunteers with (sero-positive) and without (sero-negative) circulating antibodies to hepatitis B virus surface antigen before and 30 days after vaccination with hepatitis B virus surface antigen (HBsAg). Long-term culture of monospecific hepatitis B surface (HBsAg)-responsive T-lymphocytes were isolated and grown in large numbers. The mechanism of T-cell mediated cytolysis, and the identification of the carbohydrate determinants on the surface of these effector cells responsible for the killing effect, are being examined.     

Piezoelectric immunoassay of thyroidal triiodothyronine

A re-utilizable piezoelectric crystal (PC) immunosensor for thyroidal triiodothyronine (T3) has been developed. The crystal was coated with protein A and then reacted with T3 antibody. T3 could be detected in the range of 0.5×10⁻⁶ g/L to 10.0×10⁻⁶g/L by the, system. Crystal was regenerated by saturating with T3 and subsequent binding of a new anti-T3 antibody layer. The T3 assay could be repeated up to 5 times using each crystal. Supported by the National Natural Science Foundation of China Zha Hongying: born May, 1969, Ph. D.     

Polyisoprenyl glycolipids as targets of CD1-mediated T cell responses

T cells are well known to recognize peptide antigens presented by major histocompatibility (MHC) class I or class II molecules. More recently, the CD1 family of antigen-presenting molecules has been shown to present both mammalian and microbial glycolipid antigens for specific recognition by T cells. Human CD1c proteins mediate T cell recognition of polyisoprenyl glycolipids, evolutionarily conserved phosphoglycolipids, which function in glycan synthesis pathways. This family of antigenic molecules is particularly attractive for the study of the molecular features that control T cell recognition of self and foreign glycolipids because natural polyisoprenols from mammals, fungi, protozoa, mycobacteria and eubacteria differ in structure. Moreover, these naturally occurring structural differences can influence their recognition by CD1c-restricted T cells. This review of the structural diversity and evolutionary relationships of polyisoprenoid glycolipids emphasizes those features of polyisoprenyl glycolipid biosynthesis that are relevant to their functions as targets of CD1-mediated T cell responses. Received 16 March 2001; received after revision 19 April 2001; accepted 23 April 2001     

血清糖类抗原125测定对心力衰竭患者预后评估的价值

目的:探讨血清糖类抗原125(CA125)测定对心力衰竭患者预后评估的价值.方法:201例心衰患者根据纽约心脏学会(NYHA)心功能分级标准分为Ⅱ级、Ⅲ级、Ⅳ级,入院24 h内测定血清CA125和血浆脑钠肽(BNP)浓度,将患者分为高CA125组(CA125≥35 U/m L)和正常CA125组(CA12535 U/m L),比较两组患者住院死亡率;随访12±6个月,比较两组患者死亡率及再住院率;运用多因素logistic回归分析死亡相关因素.结果:两组患者的NYHA分级、超声心动图参数(左心房内径、左心室舒张末内径、左心室射血分数)、血浆B型尿钠肽(BNP)水平有显著性差别;高CA125组住院死亡率为20.0%,正常CA125组住院死亡率为3.1%,P=0.000;随访12±6个月,两组死亡率分别为22.9%和4.6%,再住院率分别为21.3%和3.8%;多因素logistic回归分析提示CA125是心衰患者死亡独立危险因素,OR=2.257,P=0.030.结论:CA125是心力衰竭患者预后的独立危险因素,对心力衰竭患者的预后评估有一定价值.     

黑河市1995年至1998年食品,公共场所从业人员乙肝表面抗原阳性率调查

我站自１９９５－１９９８年间对食品，公共场所从业人员检验了８４１３人，对其中的体验项目表面抗原阳性者进行统计分析，对其危害性，提出了建议，使人燕对健康体验得以重视。     

Semenogelin I: a coagulum forming, multifunctional seminal vesicle protein

Human seminal plasma spontaneously coagulates after ejaculation. The major component of this coagulum is semenogelin I, a 52-kDa protein expressed exclusively in the seminal vesicles. Recently, a sperm motility inhibitor has been found to be identical to semenogelin I, suggesting that it may also be a physiological sperm motility inhibitor. The protein is rapidly cleaved after ejaculation by the chymotrypsin-like prostatic protease prostate-specific antigen, resulting in liquefaction of the semen coagulum and the progressive release of motile spermatozoa. Some of the cleavage products of Sg I may also have various biological functions. While the semenogelin I protein is unique to human and higher primates, it has recently been shown to belong to a gene family having a similar gene structure but encoding widely differing proteins. The recently elucidated characteristics of the semenogelin I gene as well as the biochemical and functional properties of the encoded protein are reviewed, and an attempt is made to integrate the various findings into a model for semen coagulation, sperm immobilization and potential other functions. Received 21 October 1998; received after revision 15 December 1998; accepted 15 December 1998     

脂质体—一种良好的疫苗载体和佐剂

脂质体是研究较为透彻，应用也比较广泛的一种载体和佐剂。根据近年的文献报道，扼要的介绍了脂质体的分类与构成，抗原捕获及脂质体疫苗的质量控制等问题，并指出了这一疫苗载体系统具有广泛的应用前景。     

大白鼠淋巴结树突状细胞的组织化学特征

以Wistar大鼠淋巴结为材料作ATP酶(ATPase)、非特异性酯酶(NSE)、5′-核苷酸酶(5′-N)和酸性磷酸酶(ACPase)的组织化学反应,可显示淋巴结中的一些树突状细胞。ATP酶反应具有特异性,既可显示出树突细胞的形态,又可根据分布情况进一步确定其为镶嵌型树突状细胞,还是Nossal氏滤泡树突网状细胞。