不同病理类型胃息肉流式细胞DNA定量研究

应用流式细胞计对５７ 例正常胃粘膜、不同病理类型的胃息肉和胃癌组织作ＤＮＡ 定量分析。正常胃粘膜、炎性息肉、增生性息肉、腺瘤性息肉及胃癌中，ＤＮＡ 非整倍体检出率分别为０％ 、７．７％ 、９．１％ 、３６．４％ 、５８．３％ ；各型胃息肉和胃癌组织的增殖期细胞比率均显著地高于正常胃粘膜组（Ｐ＜ ０．０１）；增生性或炎症性息肉组增殖期细胞比率与胃癌组比较，差异有显著性（Ｐ＜ ０．０５）或非常显著性（Ｐ＜ ０．０１），而腺瘤性息肉组增殖期细胞比率与胃癌组近似（Ｐ＞ ０．０５）。结果表明胃息肉是一种细胞增殖活跃性病变，其中腺瘤性息肉的ＤＮＡ 生物学行为更接近于胃癌，可能容易癌变；应用流式细胞ＤＮＡ 定量分析技术，结合组织病理学诊断，能对胃息肉的预后作出更为确切的判断     

CD117阳性小肠间质瘤中Ki67和p53蛋白的表达及在预后中的意义

目的 :研究小肠间质瘤 (smallbowelstromaltumors,SBST)Ki6 7和p5 3免疫组织化学的表达 ,探讨两者在肿瘤良恶性划分和预后中的作用。方法 :选用CD117阳性的SBST 33例进行光镜观察 ,用EnVisionTM+二步法免疫组化方法检测Ki6 7和 p5 3蛋白在肿瘤中的表达情况并与形态学进行比较。 结果 :33例SBST患者 ,男 2 0例 ,女13例 ,年龄 2 1～ 71岁 ,发生于十二指肠 5例 ,空肠 2 2例 ,回肠 6例。肿瘤最大径的范围在 1.5～ 2 0cm之间。在光镜下出现肿瘤内坏死的有 11例。肿瘤核分裂象计数每 5 0个高倍镜视野 0个有 6例 ,1～ 2个 5例 ,≥ 3个的有 2 2例。 33例中良性 4例 ,交界性 4例 ,恶性 2 5例。随访时间为 3～ 180个月 (平均 73.3个月 ) ,结果为良性组 4例均无瘤生存 ;交界性组 2例无瘤生存 ,1例失访 ,1例在无瘤生存 18个月后失访 ;恶性组无瘤生存有 7例 ,带瘤生存者及死亡有 16例 ,2例失访。Ki6 7染色阴性 2例 ,均为良性 ;其余 31例阳性中 ,增殖指数 (阳性细胞数 )大于 5 %的有恶性 16例 (94 .1% ) ,交界性 1例。在免疫组化p5 3染色中 ,恶性组 2 5例均呈阳性表达 (平均阳性细胞数 4 2 .9% ) ,其中 12例阳性细胞数大于 5 0 %。当Ki6 7和 p5 3均为阴性或两者阳性细胞数分别是 <1%和 <10 %时 ,肿瘤呈良性经过 ,预后     

细胞色素b在早产新生大鼠高氧肺损伤肺组织中的表达和意义

目的探讨细胞色素b（cytochrome b，Cytb）与高氧肺损伤发生、发展的关系。方法早产新生SD（Sprague-Dawley）大鼠生后1d随机分为空气组、高氧组，高氧组持续暴露于常压氧舱中，氧浓度〉85％；空气组置于同一室常压空气中。两组分别于高氧或空气暴露后1、4、7、10和14d时提取肺组织RNA，采用半定量逆转录聚合酶链反应（RT-PCR）测定CytbmRNA表达；同时应用免疫组化方法检测肺组织切片中Cytb蛋白表达；应用Western-blot检测高氧肺损伤肺组织中Cytb蛋白水平的表达变化。结果与空气组相比，高氧暴露1d、4d CytbmRNA含量及其表达显著增强（P〈0．05）；7d后Cytb呈下降趋势，其表达较空气组减弱，但两者相比差异无统计学意义（P〉0．05）。高氧暴露后，随日龄变化肺组织Cytb免化结果与CytbmRNA表达相似；与空气组相比，高氧暴露1d、4d肺组织Cytb表达显著增强（P〈0．05）；7d后Cytb呈逐渐下降趋势，其表达较空气组减弱，但7、10d两组相比差异无统计学意义，14d极显著减弱（P〈0．01）。Western-blot实验结果：与空气组相比，高氧暴露1d、4dCytb蛋白水平表达增强但两组相比差异无统计学意义（P〉0．05）；7d后Cytb呈下降趋势，其表达较空气组减弱，但7、10d两组相比差异无统计学意义（P〉0．05），而14d显著减弱（P〈0．05）。结论85％高浓度氧暴露诱导早产新生大鼠线粒体编码的Cytb异常表达，这种变化可能参与高氧肺损伤的发生。     

11β-羟类固醇脱氢酶与2型糖尿病

11β-羟类固醇脱氢酶(11β-HSDs)催化氢化可的松(皮质酮)和可的松(脱氢皮质酮)的相互转化，对调节局部糖皮质激素的活性起着重要作用，而糖皮质激素可诱导胰岛素抵抗。肝、脂肪等组织内11β-HSD活性的改变与肥胖、2型糖尿病等疾病密切相关。     

螺簧多用弓装置矫治安氏Ⅱ2错(牙合)

目的:探讨采用一种新式矫治装置矫治安氏Ⅱ2错(牙合)的临床效果.方法:选自第四军医大学口腔医院正畸科门诊安氏Ⅱ2病例20例(其中男9例,女11例),平均年龄12.6岁(10～～15.8岁).矫治装置使用多用弓 唇弓,在其上套入Ni-Ti推簧,并焊上拉钩,借助Ⅱ类牵引的力值(150g～200g),推上颌磨牙向远中移动,并适当牵引下颌后牙向近中移动,最终调整磨牙关系由Ⅱ类成为Ⅰ类.术前术后摄头颅侧位x线片,测量上下磨牙的远中、近中位移.结果:经过平均4.5个月的治疗(3.4～5.8个月),上颌磨牙平均远移2.16±1.3 mm,而下颌磨牙平均向近中移动1.38±0.64 mm.最终磨牙的Ⅱ类咬合关系得到纠正.结论:NiTi螺旋弹簧多用弓装置是一种有效的改正Ⅱ类磨牙关系的治疗方法,其矫治机制是在上颌磨牙远移的基础上,下颌磨牙适当近移共同作用的结果.     

P53表达在胸腺瘤分型中的意义

目的探讨P53的表达在不同类型胸腺瘤中的意义。方法选取我科2000年5月至2005年12月29例经病理证实的胸腺瘤手术切除标本,采用SP免疫组化方法检测P53蛋白在胸腺瘤中的表达情况。结果P53阳性表达率分别为:良性胸腺瘤7.70%,恶性胸腺瘤I型50.00%,胸腺癌100%。P53的表达随着肿瘤恶性程度的增高而增加(P<0.05)。P53蛋白表达的阳性率与胸腺组织学类型及是否伴有重症肌无力(MG)无关(P>0.05)。结论P53的表达在不同类型胸腺瘤中差异显著,对于判断胸腺瘤良恶性有重要参考价值。     

Studies on monoclonal anti-isotypic and anti-idiotypic antibodies against leukemia and myeloma: IV modulation of membrane fluidity of leukemic cell lines and tonsillar cell stimulated with McAbs

Summary In this study the technique of labelling the cell membrane with DPH fluorescence polarization was used to observe the membrane fluidity of B lymphocytic cell lines and tonsillar cells from healthy persons; the modulation effect on membrane-fluidity induced by McAbs against isotypic and idiotypic determinants of IgM from patients with leukemia was studied as well. The expression of the corresponding isotypic and idiotypic determinants of IgM on the cell membrane was determined. The results show that the membrane fluidity of leukemic cell lines is remarkably higher than that of tonsillar cells from healthy persons, and McAbs against isotypic determinants of leukemic IgM can enhance the membrane fluidity of all kinds of cells mentioned above. However, the anti-idiotypic monoclonal antibody increased only the membrane fluidity of leukemic cell lines. These results indicated that there was a close relationship between the effect of McAbs on cell membrane fluidity and the expression of corresponding isotypic and idiotypic determinants of IgM on the cell membrane.     

浅论记者的职业心理动机

采访与写作是新闻记者的一种社会性活动，社会的政治经济动向、科教文化潮流、外交军事突变以及各种风云人物的活动都是这一工作反映的内容。要写出一篇好的作品．必须要有一定的社交能力、应变能力、观察能力及写作能力．这是脑力劳动和体力劳动的综合行为。当记者在枯燥的材料堆里翻开资料，当他与一个初次采访的人物去谈话．在面临危险的环境中找新闻时……．是何种动机支配着记者去克服困难．完成这些采访任务的呢？心理学认为动机是直接推动个体活动以达到一定目的的内部动力。     

Physical and spectroscopic methods for the evaluation of the interactions of antimitotic agents with tubulin.

The physico-chemical methods for the study of the binding of ligands to tubulin are examined in-depth, emphasizing the assumptions on which they are based and their limitations. The criteria of specificity and linkage to protein self-association are presented. It is shown that, of the direct equilibrium binding techniques, Hummel-Dreyer gel permeation chromatography and rapid ultracentrifugation are applicable only when binding is not linked to protein self-association. Disc filtration is valid only when the reverse unbinding reaction is very low. Binding linked to protein self-association can be measured by batch gel permeation or by dialysis equilibrium. The indirect techniques, such as fluorescence perturbation or difference absorption spectroscopy are discussed in terms of the assumptions on which they are based. They are shown to be used best only after characterization of the binding by direct techniques. Equilibrium binding parameters can also be deduced from careful kinetic experiments. Comparison of calorimetrically measured enthalpies of binding to van't Hoff enthalpies derived from equilibrium measurements indicates that the method of choice is calorimetric, while comparison with van't Hoff analysis can reveal the existence of reaction steps not detected by equilibrium measurements. Use of other indirect approaches, such as titration of an enzymic activity, can also lead to the detection of additional steps. The criteria are set up for the proper data analysis of ligand binding linked to protein self-association and the selection of the proper mode of linkage. It is shown how the thermodynamic contributions of various moieties of a ligand can be established by a rational structural modification of the ligand and the proper analysis of the binding measurements, in which all non-specific entropic contributions are taken into account. It is demonstrated also how a similar analysis of binding data can lead to conclusions about the reaction pathway from a comparison of equilibrium thermodynamic measurements on judiciously modified ligand molecules.