降钙素基因相关肽对血管内膜损伤后内皮细胞功能恢复的 …

在球囊剥脱大鼠主动脉内膜造成的内皮损伤模型上,用ＣＧＲＰ治疗后观察血管内皮合成释放ｖＷＦ含量及ｔ－ＰＡ活性的变化。结果表明ＣＧＲＰ能明显降低ｖＷＦ含量ｔ－ＰＡ活性。提示ＣＧＲＰ能三轻内皮损伤反应,在促内皮细胞增殖的同时对内皮某些功能恢复亦有一定的作用。     

蝮蛇抗栓酶对不稳定性心绞痛患者血中部分凝血及纤溶指标的影响

测定３８例不稳定性心绞痛（ＵＡＰ）患者血中纤维蛋白原（Ｆｇ）含量、组织型纤溶酶原激活物（ｔ－ＰＡ）活性、血管性假血友病因子（ｖＷＦ）活性和血小板聚集率水平（ＰＡｇＴ）并与２１名正常人对比。患者中１８例用蝮蛇抗栓酶治疗,２０例行常规治疗。结果显示：ＵＡＰ患者血中ＰＡＩ－１、ｖＷＦ以及ＰＡｇＴ水平明显增高,ｔ－ＰＡ水平明显降低;蝮蛇抗栓酶组治疗后血中Ｆｇ、ＰＡＩ－１、ＰＡｇＴ水平均明显下降,使ｔ－ＰＡ水平明显升高;常规治疗组治疗前后各项指标无明显变化。认为蝮蛇抗栓酶对ＵＡＰ有可靠疗效     

炎症介质对离体大鼠肠系膜动脉降钙素基因相关肽释放的影响

本工作目的是在离体大鼠肠系膜动脉床灌流模型上,观察几种常见炎症介质：前列腺素Ｅ２（ＰＧＥ２）、缓激肽（ＢＫ）、组胺（ＨＩＳ）、血小板活化因子（ＰＡＦ）及５－羟色胺（５－ＨＴ）对血管周围感觉神经介质ＣＧＲＰ释放的直接影响。结果显示：ＰＧＥ２（１－１００μｍｏｌ／Ｌ）和ＢＫ（５－１０μｍｏｌ／Ｌ）能引起大鼠肠系膜动脉床时间和浓度依赖性地释放ＣＧＲＰ。ＨＩＳ,ＰＡＦ和５－ＨＴ则未见明显作用。结果提示,ＰＧＥ２与ＢＫ可能是引起血管周围感觉神经兴奋和ＣＧＲＰ释放的主要炎症介质。     

15—Mt—PGF2α对CCL4所致大鼠离体肝细胞损伤的保护作用

采用大鼠离体肝细胞原代培养２４ｈ,并利用四氯化碳ＣＣｌ４造成急性肝细胞损伤模型,检定１５－甲基－前列腺素Ｆ２α（１５－Ｍｔ－ＰＧＦ２α）对肝细胞损伤的影响。结果表明：（１）１５－Ｍｔ－ＰＧＦ２α可显著降低中毒肝细胞脂质过氧化物水平,抑制肝细胞脂质过氧化,并降低谷丙转氨酶（ＧＰＴ）和谷草转氨酶（ＧＯＴ）水平,稳定脂质膜。（２）显著促进中毒肝细胞ＲＮＡ和ＤＮＡ的合成。（３）超微结构证实１５－Ｍｔ－ＰＧＦ２α能减轻ＣＣｌ４对肝细胞脂质膜,染色质,线粒体,内质网和核蛋白体的损害。     

不同应激损伤所致血管内皮细胞中vWF的变化

目的：通过检测血管内皮细胞（ＶＥＣ）中ｖＷＦ的变化,评价ＶＥＣ的损伤。方法：利用免疫组化技术对体外培养的猪肺动脉内皮细胞（ＰＡＥＣ）和大鼠主动脉内皮细胞（ＡＥＣ）中ｖＷＦ进行免疫荧光标记,通过流式细胞仪对ｖＷＦ的细胞阳性率和荧光强度进行定性、定量分析,观察低氧和低温所引起的ｖＷＦ变化。结果：正常猪ＰＡＥＣ和大鼠ＡＥＣ的ｖＷＦ阳性率在８０％左右,阳性程序较高。但缺氧或冷冻损伤可使ＰＡＥＣ和ＡＥＣ的ｖ     

低氧对肺动脉内皮细胞PDGF—B链释放及平滑肌细胞生长的影响

应用蛋白ｄｏｔｂｌｏｔ技术检测了低氧内皮细胞条件培养液（ＨＥＣＣＭ）和常氧内皮细胞条件培养液（ＮＥＣＣＭ）内ＰＤＧＦ相对含量,并利用［３Ｈ］－ＴｄＲ掺入法和流式细胞术观察了ＨＥＣＣＭ和ＮＥＣＣＭ及加入特异ＰＤＧＦ抗体对肺动脉平滑肌细胞（ＰＡＳＭＣ）生长的影响。结果表明,ＨＥＣＣＭ中的ＰＤＧＦ含量明显高于ＮＥＣＣＭ;ＨＥＣＣＭ能明显增强ＰＡＳＭＣ内ＤＮＡ合成,促进ＰＡＳＭＣ从Ｇｏ／Ｇ１期进入Ｓ期;当预先加入ＰＤＧＦ－Ｂ链抗体时,则会明显地抑制ＨＥＣＣＭ对ＰＡＳＭＣ的ＤＮＡ合成,阻止ＰＡＳＭＣ从Ｇｏ／Ｇ１期进入Ｓ期。结果提示,低氧时ＰＡＳＭＣ增殖与肺动脉内皮细胞分泌释放ＰＤＧＦ增加有关     

人组织型纤溶酶原激活剂（t－PA）突变体FrGGI的构建、表达及特性分析

为了获得半衰期延长,特异活性提高及具有ＰＡＬ－１抗性的新型ｔ－ＰＡ溶栓剂,利用基因重组及定位突变技术构建了ｔ－ＰＡ的Ｋ１、Ｋ２区糖基化位点消除,ＰＡＩ－１结合位点缺失,Ｆ与Ｅ区连接序列Ｈｉｓ４４～Ｓｅｒ５０置换为纤粘蛋白Ⅰ型Ｆ区间连接序列ＧｌｕＳｅｒＬｙｓＰｒｏＧｌｕＡｌａＧｌｕＧｌｕ的ｔ－ＰＡ组合突变体ＦｒＧＧＩ,并在中国仓鼠卵巢细胞中获得了高效表达。对表达产物的生物学特性分析表明,ＦｒＧＧＩ在大鼠血浆中的半衰期延长了１５倍,并获得了ＰＡＩ－１抗性,是一株很有希望的新型溶栓剂候选株。     

一氧化氮和前列腺素在内毒素引起降钙素基因相关肽释放中的作用

本实验在离体灌流大鼠肠系膜动脉床研究内毒素引起降钙素基因相关肽（ＣＧＲＰ）释放的机制。内毒素（５０μｇ／ｍｌ）使ＣＧＲＰ释放增加１６倍,一氧化氮合成酶（ＮＯＳ）底物Ｌ－精氨酸（Ｌ－Ａｒｇ）能促进内毒素引起的ＣＧＲＰ释放（４１％）。ＮＯＳ抑制剂Ｎ￣Ｇ－硝基－Ｌ－精氨酸（Ｌ－ＮＮＡ）及鸟苷酸环化酶抑制剂甲基蓝（ＭＢ）能使内毒素的上述作用分别降低３５％与３６％,Ｌ－精氨酸（ｔ－Ａｒｇ）能逆转Ｌ－ＮＮＡ的作用。提示内毒素的作用机制中部分是通过一氧化氮引起细胞内ｃＧＭＰ升高而介导的。用化学方法破坏血管内皮细胞,Ｌ－ＮＮＡ与Ｌ－Ａｒｇ的上述作用依然存在。提示内毒素主要是激活血管周围感觉神经末梢的神经源ＮＯＳ,而非内皮源ＮＯＳ。环氧化酶抑制剂消炎痛（Ｉｎｄｏ）与布洛芬（Ｉｂｕ）也能使内毒素引起ＣＧＲＰ释放的作用分别降低３４％与３９％,但与Ｌ－ＮＮＡ的作用不能迭加。提示内毒素可能通过激活神经源ＮＯＳ进而引起环氧化酶活化而起作用。     

几种扩血管多肽对bFGF促血管平滑肌细胞增殖作用的影响

目的和方法：研究肾上腺髓质素（Ａｄｍ）、降钙素基因相关肽（ＣＧＲＰ）及Ｃ－型心房利太（ＣＮＰ）对碱性成纤维细胞生长因子（ｂＦＧＦ）促血管平滑细胞（ＶＳＭＣ）增殖作用的影响及其机制。结果：孵育２４ｈ后,ｂＦＧＦ刺激ＶＳＭＣ增殖较对照组增加２．１倍（Ｐ〈０．０１）,细胞内蛋白磷酸化程度增加１．４倍（Ｐ〈０．０１）,ＰＫＣ及ＭＡＰＫ活性分别增加１．５和２．５倍（Ｐ〈０．０１０;Ａｄｍ．ＣＧＲＰｔ ＣＮＰ     

人组织型纤溶酶原激活剂（t—PA）突变体FrGGI的构建,表达及特性…

为了获得半衰期延长,特异活性提高及具有ＰＡＩ－１抗性的新型ｔ－ＰＡ溶性剂,利用基因重组及定位突变技术构建了ｔ－ＰＡ的Ｋ１、Ｋ２区糖基化位点消除,ＰＡＩ－１结合位点缺失,Ｆ与Ｅ区连接序列Ｈｉｓ４４￣Ｓｅｒ５０置换为纤粘蛋白Ｉ型Ｆ区间连接序列Ｇｌｕ Ｓｅｒ Ｌｙｓ Ｐｒｏ Ｇｌｕ Ａｌａ Ｇｌｕ Ｇｌｕ的ｔ－ＰＡ组合突变体ＦｒＧＧＩ,并在中国仓鼠卵巢细胞中获得了高效表达,对表达产物的生物学特性分析表明     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.