反义核酸对肿瘤细胞多药抗性的抑制：作用靶点及作用方？…

为了用反义寡聚ＤＮＡ调控要霉素肿瘤细胞ＫＢ－Ａ－１的多药抗性,对反义核酸的预作用位点、作用方式和硫代化类似物进行了研究。筛选得到两段对应于翻译起始区（３）和Ｐ－糖蛋白ＡＴＰ结合位点（９）的２０聚反义片段,发现反义核酸的使用次数对结果的检测有很大影响,采用５μｍｏｌ／Ｌ５μｍｏｌ／Ｌ的反义片段９连续处理４ｄ,实现了将近５０％抑制效果,而其正义和错义链在１０μｍｏｌ／Ｌ沈度的同样处理条件下则没有检测到     

The Effect of different interventional treatment on P-Glycoprotein in different histopathological types and grades of primary hepatocellular carcinoma

Primary hepatocellular carcinoma( PHC) isvery common in China and chemotherapy has beenone of the classic and important methods for treatingPHC. Transcatheter arterial chemoembolization( TACE) has been one of main non- surgicaltherapiesfor PHC. The intrinsic or acquired multidrug resis-tance( MDR) has been an important problem inchemotherapy for PHC,because MDR tend to resultin cancer cells of PHC either failing to respond tochemotherapy or relapsing quickly after remission.Some stud…     

结肠癌P糖蛋白和p53蛋白表达的关系

目的 探讨Ｐ糖蛋白（Ｐ－ｇｐ０和Ｐ５３蛋白在结肠腺癌中的表达意义。方法 应用免疫组织化学方法检测术前进行化疗的１４０例结肠癌组织中的多药耐药基因产物Ｐ－ｇｐ和Ｐ５３蛋白的表达。结果 Ｐ－ｇｐ和Ｐ５３在结肠癌中的表达为２３．５７％（３３／１４０）和４０％（５６／１４０）。Ｐ－ｇｐ表达与结肠癌的组织学类型,浸润深度和淋巴结转移状况无关（Ｐ〉０．０５）,而Ｐ５３除与淋巴结转移状况有关外（Ｐ〈０．０５）,     

脑梗死患者急性期血小板膜糖蛋白表达的研究

目的　探讨脑硬死患者急性期血小板膜P -选择素 (CD6 2p)的表达及其与临床神经功能缺损程度的关系。方法　用流式细胞术测定 41例急性期脑梗死患者血小板膜CD6 2 p的表达。 结果　轻、中、重型脑梗死患者CD6 2 p的表达分别为 (1.38± 0 .2 9) %、(3.15± 1.5 8) %、(10 .46± 5 .0 7) % ,与正常对照组 (1.5 6± 0 .17) %比 ,轻型脑梗死患者CD6 2p的表达无显著性差异 (P >0 .0 5 ) ,中、重型脑梗死患者CD6 2 p的表达显著升高 (P <0 .0 5和0 .0 1)。结论　脑梗死患者急性期血小板膜CD6 2 p的表达与临床神经功能缺损程度有关。     

The role of the envelope glycoprotein in the depletion of T helper cells in human immunodeficiency virus infection

Infection with the human immunodeficiency virus (HIV) causes gradual depletion of CD4+ T helper lymphocytes and destruction of the lymphoid tissue, which ultimately leads to a fatal defect of the cellular immune system. Paramount to the understanding of the pathogenesis of HIV infection is to elucidate the mechanism which underlies the loss of T helper cells. Various ideas have been proposed in order to explain this issue. Several hypotheses have focused on the role of the envelope glycoprotein in this process. This review summarizes the data obtained and concepts proposed regarding the involvement of the HIV glycoprotein in the pathology of CD4+ T cell depletion. This work was supported by the Deutsche Forschungsgemeinschaft, the Bundesministerium fur Bildung, Wissenschaft, Forschung und Technologie and the Stifterverband für die Deutsche Wissenschaft     

A Simple and Rapid Fluorometric Determination Method of α1-Acid Glycoprotein in Serum Using Quinaldine Red

We examined different fluorescent probes suitable for fluorometric determination of ₁-acid glycoprotein (AGP) in serum. Quinaldine red (QR) was shown to bind strongly and selectively to AGP. Taking advantage of the enhanced fluorescence of QR in the presence of AGP, we developed a direct method for the determination of serum AGP without removal of other serum proteins such as albumin. AGP concentrations in serum of healthy volunteers and patients correlated well with results from the conventional single radial immunodiffusion (SRID) method (r = 0.93, slope = 1). The newly developed method is faster and has a larger analytical concentration range than the SRID method. This method can also be used to determine AGP in serum of experimental animals, and it can serve to monitor AGP serum concentrations for pharmacokinetic evaluation of basic drugs.     

Effect of platelet-activating factor on secretion of mucous glycoprotein from chinchilla middle ear epithelial cells in vitro

Platelet-activating factor (PAF) is a naturally occurring phospholipid that acts as a pleiotropic mediator and mediates cell-cell reactions under physiological and pathological conditions. Recently, it has been shown that PAF is a strong secretagogue of mucous glycoprotein in the airways, suggesting its role in mucous glycoprotein secretion and the pathogenesis of otitis media with effusion. In the current study, we examined the effect of PAF on mucous glycoprotein secretion in cultured chinchilla middle ear epithelial cells. PAF at 1 M significantly stimulated mucous glycoprotein secretion from cultured chinchilla middle ear epithelial cells. This action was concentration-dependent, with secretions reaching near maximum when the cells were incubated with PAF at 100 M. In a time-dependent study, PAF demonstrated an initial rapid stimulation of mucous glycoprotein secretion, followed by a gradual increase thereafter. A six-fold increase was seen in the first 2 h compared with controls. Cycloheximide, a protein synthesis inhibitor, demonstrated an inhibitory effect on PAF-stimulated mucous glycoprotein secretion in this study. These findings suggest that PAF plays an important role in the pathogenesis of otitis media with effusion by stimulating mucous glycoprotein secretion in vitro.Supported by NIH grant P0I-D000133 from the National Institute on Deafness and Other Communication Disorders.     

Characterization of the epitope recognized by a mAb that reacts differentially with murine suppressor T cells

Although reliable antibodies are available that distinguishhuman suppressor T (T_s) cells from CTL and other T cells, feware available for murine T_s cells. We have developed a mAb (984D4.6.5)that, in the presence of complement, depletes alloantigen-specificT_s cells but not CTL. This antibody recognizes activated TT_scells but not their precursors. In these studies, flow cytometricanalysis demonstrates that 984D4.6.5 reacts with several T_scell hybridomas, cloned T_h cell lines and WEHI-3 (a myelomonocytictumor cell line). Reactivity was not detected with BW5147, T_hcell hybridomas, cloned T_h cells, CTL lines and hybridomas,B cell lines, thymocytes, splenocytes, bone marrow cells nora variety of tumor cells. Among 984D4.6.5 positive lines, expressionis heterogeneous and the number of cells expressing high levelsof the epitope is increased when the hybridomas are maintainedat a relatively high cell density. Neuriminidase and pronasedeplete the epitope recognized by mAb 984D4.6.5. Protein synthesisand glycosylation inhibitors also reduce expression of thisepitope. These observations suggest that the epitope recognizedby 984D4.6.5 is a carbohydrate linked to a polypeptide. Thisantibody was tested by ELISA for binding to a large panel ofcarbohydrates and glycollpids coupled to BSA. The only one thatbound 984D4.6.5 was LS tetrasaccharide c (NeuNAc2-6Galpß1-4GIcNAcß1-3GaIß1-4Glc),an O-linked carbohydrate. Comparative analysis shows that boththe sequence and the linkage of these sugars are essential tothe reactivity with the 984D4.6.5 antibody. This epitope isexpressed by a glycoprotein of-200 kDa, as shown by Westernblots. The identity of this glycoprotein remains to be determined,but indirect evidence suggests that it is not CD45.     

Mapping of murine YACs containing the genesCea2 andCea4 after B1-PCR amplification and FISH-analysis

PCR with primers specific for the murine B1 consensus sequence allows amplification of DNA from murine sources. We have used B1-PCR for amplifying yeast artificial chromosome (YAC) DNA which can be used to localize single YACs by fluorescencein situ hybridization. The genes for the pregnancy-specific glycoproteins Cea2 and Cea4, both belonging to the large carcinoembryonic antigen gene family, were localized by chromosomalin situ suppression hybridization of three YAC clones to murine chromosome 7A2-A3. This was facilitated by the use of the mouse lymphoma cell line WMP/WMP which contains nine pairs of Robertsonian fusion chromosomes.     

API0134对血小板α颗粒膜蛋白和血小板聚集的影响

２０例急性心肌梗死患者在溶栓后随机分为穿心莲有效成分（ＡＰＩ０１３４,ＡＰＩ）组与对照组,治疗１５ｄ,均同时给予阿司匹林等药物。检测溶栓前后血浆α颗粒膜蛋白（ＧＭＰ－１４０）浓度和ＡＤＰ诱导的血小板聚集反应。结果表明,ＡＰＩ组溶栓后７２ｈ血浆ＧＭＰ－１４０浓度轻度增加,对照组显著性增加（Ｐ＜０．０１）。ＡＰＩ组ＧＭＰ－１４０在溶栓后７２ｈ和１５ｄ均低于对照组,差异有显著意义（均为Ｐ＜０．０５）。ＡＰＩ组１ｍｉｎ和５ｍｉｎ血小板聚集率均低于对照组,差异均有显著意义（７２ｈ,Ｐ＜０．０５;１５ｄ,Ｐ＜０．０１）。研究表明,ＡＰＩ与阿司匹林联合应用可抑制溶栓后血小板的活化,优于阿司匹林单独应用,因此ＡＰＩ有可能用于临床预防溶栓后的再闭塞。