松口蘑菌丝体蛋白质诱导细胞凋亡

采用深层发酵技术培养菌丝体并提取分离出的蛋白质,进行体外抗人子宫颈癌HeLa细胞增殖及诱导细胞凋亡机理的研究.试验发现松口蘑菌丝体水提液中活性蛋白质TMP在体外具有抑制肿瘤细胞增殖的作用,扫描电镜观察到TMP处理细胞产生明显的凋亡小体,TMP对细胞周期的影响是通过抑制细胞从S到G2M期的转化来抑制HeLa细胞增殖,诱导细胞发生凋亡的.DNA电泳出现以200bp左右为单位的DNA碎片.结果表明采用液体培养方法生产的松口蘑菌丝体蛋白质,具有显著的抑制细胞增殖和诱导细胞凋亡作用.     

松口蘑糖蛋白联合5-Fu体外对人肝癌细胞Bel-7402的影响及作用机理初探

采用MTT法研究了松口蘑抗肿瘤糖蛋白MTS03与化疗药物5-Fu单独及联合使用对人肝癌细胞Bel-7402的影响及对人正常肝细胞L-02的毒性作用，观察不同浓度配比及不同作用时间对细胞是否具有增效减毒的作用；采用扫描电镜观察MTS03作用后的Bel-7402细胞形态．结果表明，MTS03与5-Fu在较低浓度单独使用对肿瘤细胞无显著差异，但两者联合使用增强了对肿瘤细胞的杀伤作用，而对正常细胞的作用较小，联合使用的q值均大于0．85，说明不存在拮抗作用．扫描电镜观察到凋亡小体的形成，随着剂量升高，凋亡小体增多．这一结果说明两者合用后MTS03增加了5-Fu对肝癌细胞的敏感性，同时降低了两者单一高剂量使用时引起的毒副作用，同时MTS03能诱导Bel-7402细胞膜皱缩和凋亡小体的形成．     

麦胚水溶性糖蛋白的分离纯化及性质测定

从麦胚水溶性提取物中分离得到粗蛋白 糖复合物,经DEAE Cellulose和SephadexG100柱层析,得到均一的麦胚水溶性糖蛋白(WGWSGP).SepharoseCL 6B凝胶过滤纯度检验表明WG WSGP是单一对称峰,经SDS PAGE电泳测定其相对分子质量为40260.     

胆管癌组织及其胆汁糖蛋白末端唾液酸结构的改变及其意义

目的探讨胆管癌组织及其胆汁糖蛋白N 型糖链末端唾液酸的结构特点及意义。方法采用半定量RT PCR法 ,分析 35例胆管癌和 35例良性胆管组织唾液酸转移酶ST6Gal Ⅰ和ST3Gal ⅢmRNA的表达 ;采用能识别末端唾液酸结构的麦胚凝集素 (WGA) ,对良恶性标本进行WGA组织化学染色 ,并进行图像分析 ;对各良恶性胆汁进行WGA点印迹分析。结果胆管癌组织中ST3Gal Ⅲ和ST6Gal ⅠmRNA表达均增强 (P <0 0 1) ,以ST3Gal Ⅲ明显 ;胆管癌组织WGA阳性率为 10 0 % (35 / 35 ) ,良性组织为 4 3% (15 / 35 ) ,胆管癌WGA强度指数高于良性对照组 (P <0 0 1) ;胆管癌组织WGA指数与ST3Gal ⅢmRNA表达正相关 ,二者均与TNM分期、肿瘤分化、转移等有关 ;恶性病变胆汁WGA点印迹阳性率 (83% )高于良性病变胆汁 (17% ) ,且与胆管癌组织WGA指数有关。结论胆管癌细胞糖蛋白末端唾液酸含量增加 ,并发生连接键型的变化 ,具有特征性 ,与胆管癌生物学特性有关 ;在分泌的胆汁中也可检测到糖蛋白末端唾液酸含量增加。     

甘薯水溶性糖蛋白的分离纯化及结构初探

采用二乙基氨基纤维素DEAE-52和葡聚糖凝胶G100柱层析法,从甘薯中分离纯化甘薯糖蛋白,并对其结构进行了初步探讨.研究结果表明,糖蛋白纯品呈白色,易溶于水;蛋白质质量分数为61.2%,通过SDS-聚丙烯酰胺凝胶电泳对糖蛋白进行纯度鉴定,结果显示只有一条谱带.气相色谱分析表明甘薯糖蛋白中糖链部分含有鼠李糖、阿拉伯糖、甘露糖、葡萄糖、半乳糖;红外光谱和β-消去反应表明:甘薯糖蛋白中含有α-糖苷键,糖苷键类型主要为吡喃型;糖与蛋白的肽链之间的连接点类型是O-糖肽键.     

胆管癌胆汁中糖蛋白的糖链结构特点

目的：探讨与胆管癌相关的胆汁糖蛋白的糖链结构特点。方法：对15例胆管癌胆汁及10例良性胆道疾病的胆汁蛋白进行蛋白质电泳考马斯亮蓝及银染色，并用4种识别不同糖链结构的辣根过氧化酶标记的凝集素（ConA-HRP,WGA-HRP,LCA-HRP,DSA-HRP）进行凝集素印迹分析。结果：胆管癌胆汁和良性胆汁蛋白SDS－PAGE谱基本相同，ConA结合的胆管癌相关糖蛋白有4种（－138，－122，－108，－101kDa)，WGA结合胆管癌相关糖蛋白1种（－201kDa);LCA结合胆管癌相关糖蛋白1种（－122kDa);DSA结合胆管癌相关糖蛋白3种（－201，－163，－122KDa)。结论：胆管癌胆汁中一些糖蛋白的糖链结构发生了改变，主要表现为唾液酸含量增加及天线数，高甘露糖型糖链增多，可能与胆管上皮的恶性转化有关。     

精浆中Tamm-Horsfall糖蛋白的检测及其意义

为了观察Ｔａｍｍ－Ｈｏｒｓｆａｌ糖蛋白（ＴＨＰ）在男性精浆中的变化,我们应用放射免疫分析方法（ＲＩＡ）对１０例正常生育男性和７８例不育者精浆中的ＴＨＰ进行了检测,其结果如下。１对象和方法１．１检测对象７８例不育男性均系婚后２～１４年,夫妻性生活正常,...     

胆囊结石中糖蛋白的研究进展

糖蛋白是胆结石的重要组成成分,包括粘蛋白和非粘性糖蛋白。胆结石中蛋白质的组成可反映其形成时所处的物理化学环境。本文就胆囊结石中粘蛋白和非粘性蛋白的组成、来源、存在形式及其在结石形成中的作用作一综述。     

魔芋葡甘露聚糖的化学结构与流变性质

本文着重研究了从四川白魔芋(Amorphophallus albus)和花魔芋(Amorphophallus rivieri)分离而得的白魔芋葡甘露聚糖(aKGM)和花魔芋葡甘露聚糖(rKGM)的化学结构与流变性质,还研究了aKGM与其它多糖黄原胶(XanthanGum 简称XG)的协同作用以及aKGM与蛋白质的相互作用。由X-射线衍射法证明aKGM与rKGM均属无定形结构,因而具有非常强的吸水膨胀性能:由凝胶过滤与光散射法证明aKGM的分子量大于rKGM,两者的分子量都较均一;由HPLC法测得aKGM与rKGM中葡萄糖(G)与甘露糖(M)的摩尔比分别为1:1.70与1:1.60。魔芋葡甘露聚糖(Konjac Glucomannan 简称KGM)水溶液为典型的假塑性流体,aKGM水溶液的稠度大于rKGM。研究结果表明,KGM-XGKGM-SP与I(SPI为分离大豆蛋白)是两种新型的胶凝剂,这对于拓宽魔芋的应用范围有极其重要的价值。.     

巴西蘑菇发酵菌丝体醇提物的抑瘤活性

巴西蘑菇深层发酵的菌丝体，用热水提取出水溶性成分（主要是活性多糖）后，残渣用体积分数859，6的乙醇提取，对乙醇提取物进行了抑瘤活性的研究。体外细胞培养实验表明，菌丝体醇提物对人肝癌细胞Bel-7402有一定抑制作用，半抑制浓度（IC50）为1507μg／mL：体内则显示出了较强的抑瘤效果，腹腔注射（i．p．）每天10、50、100mg／kg，对S180荷瘤鼠的瘤重抑制率分别为44．72％、66．50％和70．49％；灌胃（p．o．）每天800mg／kg，对S180腹水瘤鼠的生命延长率达到52．94％。结果表明：巴西蘑菇深层发酵菌丝体的醇提物具有较强的抑瘤作用，其具体的功效成分值得进一步研究。     

鸡(士从)菌培养特性的初步研究

采用固体培养和液体培养方法研究了鸡[士从]菌的培养特性以及培养基、pH值、酵母膏对其菌丝生长的影响。结果表明：鸡[士从]菌在普通固体培养基中生长缓慢,菌落较小,在培养后期,菌株间存在3种明显的菌落类型即“菌丝型”、“孢子型”、“中间型”,产孢量和形态也有较大差异。在液体培养条件下鸡[士从]菌的生长较快,培养基、pH值、酵母膏浓度对液体菌丝生长存在很大影响。各供试菌株在液体摇床培养中的最佳培养条件基本一致：即最适pH值为4.5;酵母膏最佳质量浓度为0.2 g/dL;理想培养基为PSDYB。     

鼠骨组织成骨细胞的离体培养和生长特性

目的：观察大鼠骨组织来源成骨细胞的体外分离培养的条件及生长特征，为骨组织工程学实验研究奠定基础。方法；取出生24hSD乳鼠的顶骨，酶经法分离培养成骨细胞并传代，观察其生物学特征，并进行ALP活性测定，绘制生长曲线、分裂指数曲线和贴壁率曲线、测定细胞贴壁及延展时间。并将培养细胞进行冻存、复苏、比较细胞特性有无改变。结果：培养细胞在第8代以前生长性状稳定，具有典型的成骨细胞特性，可作为实验细胞；第4d为细胞生长倍增时间，第5－6d细胞达生长高峰；第4d细胞分裂最为旺盛，达18％；传代后10h贴壁率最高，为90％；冻存复苏后的细胞生物学特性无改变。结论：本实验方法体外培养的成骨细胞，生长性状稳定，增殖速度快，具有与体内成骨细胞相同的生物学特性，保证了相关实验的可靠性和准确性，可作为骨组织工程学研究的种子细胞。     

Characteristics of spermatogonial stem cells derived from neonatal porcine testis

The aim of this study was to isolate and characterise porcine spermatogonial stem cells (PSSCs). The putative porcine germline stem cells from testis were isolated successfully by an improving way of enrichment with lymphocyte separation medium (LSM). Results from RT‐PCR analyses showed that PSSCs were positive for OCT4, SOX2, NANOG, PGP9.5, c‐MYC, KEL4 and PRDM‐14 which are multipotent stem cell markers. At the protein level, the results of immunofluorescence analyses showed that PSSCs were positive for OCT4, PGP9.5, SOX2 and CD29. We successfully differentiated these PSSCs into adipocytes and muscle cells and then defined their characteristics, including morphology, surface stem cell markers, and mechanical properties. But the experiment of teratoma formation was negative. The results indicated the PSSCs could be multipotent. Atomic force microscopy was used to characterise the morphological and mechanical properties of undifferentiated PSSCs, as well as the differentiated adipocytes and muscle cells, which could be potentially useful for distinguishing PSSCs from differentiated cells.     

The Success of A.I.D. and Semen Characteristics: Study on 1489 Cycles and 192 Ejaculates

A comparison was made between successful (167) and unsuccessful (1322) insemination cycles in order to evaluate the role in conception of different semen characteristics. The most important semen variable was found to be post-thaw motility: the success rate per cycle increased from 7% when post-thaw motility was ≤ 40% to 17% when it was ≥ 63%. Multiple inseminations in a cycle increased the success rate primarily when semen quality was poor. The results of this study show how and to what degree efficacy in A.I.D. can be improved by a judicious choice of the semen to be utilized and the number of inseminations to be practiced.     

Elastic Characteristics of Digital Cores from Longmaxi Shale Using Lattice Spring Models

Effective medium methods for the attribution of micro-structures to macroelastic properties of shales are important for the prediction of sweet spots in the shale-gas production. With X-ray micro-computed tomography (XMCT), the micro-structuresof shale core samples from Longmaxi Formation are visualized and characterized by3D digital images. As an efficient alternative to conventional effective medium methods for estimating elastic properties, we propose a consistent workflow of lattice springmodeling (LSM) to emulate the digital cores using three types of lattices. Particularattention is paid to investigate the effective Young's moduli, Poisson's ratios, and preferred orientations, by uniaxial compression tests along two directions. Within elasticdeformation, the impact of lattice arrangements on the anisotropy is even more thanthose of stress disturbances and micro-structural features. Compared with analyticalapproximations and theoretical predictions, the LSM numerical scheme shows generalapplicability for heterogeneous porous rocks.     

Abortion Rate in A.I.D. and Semen Characteristics: A Study of 1345 Pregnancies

A study undertaken on 1345 pregnancies resulting from artificial insemination with donor showed an 18% risk of abortion. This figure is the same as that admitted for natural reproduction. It does not depend on any of the classically studied semen characteristics and in particular remains invariant whatever the postthaw motility, the factor most strongly linked to conception rate. Two results, well known from the literature, i.e. the increased abortion rate mentioned in natural reproduction when the sperm is of poor quality and the high incidence of repeated abortions when sperm quality is particularly good are discussed. The first of these results cannot be considered as being established in a statistically significant way. The second may result from different sources of bias, some of which are identified. In essence a high frequency of abortions signifies simply a high frequency of pregnancies, it is therefore not surprising that the semen is in this case particularly good.