雷洛昔芬对血管内皮细胞雌激素应答元件转录活性的影响

目的:研究选择性雌激素受体调节剂(SERM)雷洛昔芬(raloxifene)对血管内皮细胞雌激素应答元件(ERE)转录活性的影响。方法:首先构建ERE荧光素酶报告基因质粒(ERE-TK-Luc),然后采用真核细胞转染技术将ERE-TK-Luc与内参照质粒PRL-SV40一起转染体外培养的血管内皮细胞,检测raloxifene刺激的转染细胞荧光素酶的相对活性,与未用药的转染细胞进行比较。并同时采用raloxifene与雌二醇(E₂)共同处理细胞,观察raloxifene对E₂作用的影响。结果:在raloxifene处理的转染细胞中荧光素酶表达量低于未用药的转染细胞,raloxifene浓度为10^-7mol/L时更明显(P<0.01);E₂可使转染细胞荧光素酶表达量明显高于未给药组(P<0.01),而raloxifene与E₂同时处理则细胞荧光素酶表达水平与对照组相近(P<0.01)。结论:Raloxifene对血管内皮细胞ERE转录活性有抑制作用。     

特殊染色和免疫组织化学染色在肾上皮性肿瘤诊断中的应用

目的 探讨肾上皮性肿瘤的诊断及鉴别诊断。方法 对91例具有较完整病理资料的肾上皮性肿瘤进行了常规组织学观察,Mowy胶状铁染色及CD10、细胞角蛋白(CK)7、波形蛋白免疫组织化学染色。结果 91例肾上皮性肿瘤中肾透明细胞癌78例,占86％;肾乳头状癌8例,占9％;肾嫌色细胞癌4例,占4％;肾嗜酸细胞腺瘤1例,占1％。78例肾透明细胞癌中CD10、波形蛋白阳性分别为63例(81％)和69例(88％),主要表现为细胞膜阳性。74／78肾透明细胞癌CK7呈阴性,17／17 Mowy胶状铁染色阴性或呈灶状粗颗粒。肾嫌色细胞癌4例,CK7均呈胞膜阳性;Mowy胶状铁染色表现为胞质内蓝色细网状;4例CD10肿瘤细胞膜均阴性,波形蛋白阴性。肾嗜酸细胞腺癌1例CD10,CK7,波形蛋白,Mowy胶状铁染色均为阴性或不特异。结论 在常规诊断肾上皮性肿瘤有困难时免疫组织化学CD10,CK7,波形蛋白染色以及Mowy胶状铁染色对鉴别诊断有帮助。     

Expression of Cytochrome P450nor in Escherichia coli , Purification and Preparation of Polyclonal Antibodies

The term “cytochrome P450” was characterized of aunique 450 nm optical absorption peak of its carbon mon oxide bound form. Cytochrome P450s constitute a super gene family of heme containing proteins that are involvedin the metabolism of a variety o…     

Three cases of childhood nocturnal asthma due to buckwheat allergy

BACKGROUND: Buckwheat flour (BF) is known as a potent food allergen. Sensitization to it usually occurs by ingestion but also by inhalation in occupational or domestic exposure. Buckwheat chaff-stuffed pillows (BCP) can be contaminated with BF during the process of pilling, and many Korean children and adults use BCP for health reasons. METHODS AND RESULTS: We here present three cases of BF allergy in children using BCP, who had been treated as nonatopic asthmatics after undergoing the routine allergy skin tests and serologic tests. We took careful clinical histories, and performed skin prick tests (SPT), the radioimmunoassay (RIA) for specific IgE, the BCP-elimination test, the BF bronchial provocation test, and IgE Western blot. All three children showed positive skin reactions to BF, but none of them had positive reactions to house-dust mites. Nocturnal asthmatic symptoms were improved during 7 days of BCP elimination, and asthmatic responses were observed by bronchial provocation tests with homemade BF extract. Serum BF-specific IgE antibodies and several IgE-binding proteins were detected by RIA and Western blot analysis, respectively. CONCLUSIONS: Thus, a small amount of BF attached to BCP can induce BF sensitization, and BCP should be considered a main cause of childhood nocturnal asthma in those asthmatics exposed to these pillows.     

网状组织细胞增生症组织病理及免疫组化研究

观察１例多中心网状组织细胞增生症和５例网状组织细胞肉芽肿（ＲＨ）病理表现，两病均由甲状腺嗜酸细胞样单核组织细胞和多核组织细胞组成，在ＲＨ还可见空泡状、棘状和黄瘤样单核组织细胞。免疫组化示：ＫＰ１（ＣＤ６８）、溶菌酶、ａ１－抗胰蛋白酶、花生凝集素和Ｖｉｍｅｎｔｉｎ阳性，Ｍａｃ（３８７），Ｓ－１００，ＨＬＡ－ＤＲ、Ｄｅｓｍｉｎ、Ａｃｔｉｎ阴性，讨论两病的组织病理、免疫组化鉴别及ＲＨ与成人黄色肉芽肿关系。     

HIV-1准种的变化与疾病进展关系的研究

目的　研究HIV 1准种的变化对疾病进展的影响。方法　PCR方法扩增HIV 1V3～V5区片段 ,采用HMA(异源双链泳动分析 )的方法分析 4 8例HIV/AIDS准种的变化 ,并结合HIV/AIDSCD4 T淋巴细胞计数及病毒载量的结果分析HIV 1准种的变化对疾病进程的影响。结果　在不同的疾病状态下 ,体内病毒变异是不相同的 ,在体内CD4 T淋巴细胞计数较高 ,血浆病毒载量低的个体内 ,病毒毒株有很强的变异特征 ,体内具有很高的准种复杂度 ;而在CD4 细胞数很低 ,病毒载量较高的个体 ,病毒基因变异较少 ,病毒准种较为单一。结论　HIV 1准种的变化与疾病进展相关。     

大鼠催乳素瘤形成过程中催乳素基因的表达

给ＳＤ大鼠皮下埋植内含１７β－雌二醇硅橡胶管３０、６０、１２０天后，发现大鼠垂体重量随给药时间延长呈持续性增加；用放射免疫法测定血浆催乳素含量，亦依次明显升高；用Ｎｏｒｔｈｅｒｎ印迹杂交方法检测垂体细胞中ＰＲＬ基因，发现ＰＲＬ ｍＲＮＡ含量也依次显著增加，但其增加却远低于血浆ＰＲＬ含量的增加，提示β－雌二醇除了促进ＰＲＬ基因的转录外，还可能增加ＰＲＬ ｍＲＮＡ的翻译效率。     

3'-Terminal RNA secondary structures are important for accumulation of tomato bushy stunt virus DI RNAs

The plus-strand RNA genome of tomato bushy stunt virus (TBSV) contains a 351-nucleotide (nt)-long 3'-untranslated region. We investigated the role of the 3'-proximal 130 nt of this sequence in viral RNA accumulation within the context of a TBSV defective interfering (DI) RNA. Sequence comparisons between different tombusviruses revealed that the 3' portion of the 130-nt sequence is highly conserved and deletion analysis confirmed that this segment is required for accumulation of DI RNAs in protoplasts. Computer-aided sequence analysis and in vitro solution structure probing indicated that the conserved sequence consists of three stem-loop (SL) structures (5'-SL3-SL2-SL1-3'). The existence of SLs 1 and 3 was also supported by comparative secondary structure analysis of sequenced tombusvirus genomes. Formation of the stem regions in all three SLs was found to be very important, and modification of the terminal loop sequences of SL1 and SL2, but not SL3, decreased DI RNA accumulation in vivo. For SL3, alterations to an internal loop resulted in significantly reduced DI RNA levels. Collectively, these data indicate that all three SLs are functionally relevant and contribute substantially to DI RNA accumulation. In addition, secondary structure analysis of other tombusvirus replicons and related virus genera revealed that a TBSV satellite RNA and members of the closely related genus Aureusvirus (family Tombusviridae) share fundamental elements of this general structural arrangement. Thus, this secondary structure model appears to extend beyond tombusvirus genomes. These conserved 3'-terminal RNA elements likely function in vivo by promoting and/or regulating minus-strand synthesis.