Tenascin，β-catenin，TGF—β1在胃癌中的表达及意义

目的：探讨胃癌组织中Tenascin、β—catenin、TGF－β1的表达及意义。方法：采用免疫组织化学方法检测70例胃癌组织和20例癌旁正常组织中Tenascin、β-catenin、TGF—β1的表达。结果：①Tenascin主要表达于胃癌组织中癌相关纤维母细胞的胞质,且与胃癌的Lauren分型、分化程度、临床分期、淋巴结转移关系显著（P〈0．05）;②β－catenin在胃癌的异常表达与胃癌的Lauren分型及分化程度关系显著（P〈0．05）;③TGF—β1在胃癌组织中主要表达于肿瘤细胞的胞质,其表达强度与胃癌的临床分期、浸润深度及淋巴结转移显著相关（P〈0．05）;④Tenascin与β—catenin在胃癌中的表达呈负相关（r=－0．505,P〈0．05）。结论：胃癌组织中Tenascin、β—catenin、TGF—β1蛋白的表达与肿瘤的侵袭、转移关系密切,β-catenin对间质中Tenascin的聚集具有抑制效应。     

胃癌组织中Tenascin、MVD、Ki-67的表达及其临床意义

目的：探讨胃癌组织中Tenascin蛋白、微血管密度（microvascular density,MVD）、Ki-67的表达及其与临床病理特征的关系。方法：采用免疫组化Elivision法检测70例胃癌组织和20例癌旁正常组织中Tenascin、CD34和Ki-67的表达。结果：①正常胃黏膜上皮Tenascin阴性,胃癌中的Tenascin主要表达于肿瘤相关纤维母细胞的胞质中,且与胃癌的Lauren分型、分化程度、临床分期、淋巴结转移显著相关（P〈0．05）;②胃癌中MVD和Ki-67-LI（标记指数）均高于正常胃黏膜（P〈0．001）,且均与胃癌的临床分期、浸润深度、淋巴结转移显著相关（P〈0．05）;结论：胃癌组织中Tenascin可抑制胃癌的演进,MVD及Ki-67可作为胃癌患者预后的预测指标,联合检测胃癌组织Tenascin、MVD、Ki-67的表达情况,对于进一步了解胃癌的生物学行为和判断预后具有一定的临床价值与意义。     

中国云南白族和新疆维族7个Y-STR基因座的遗传多态性

利用AB I3100遗传分析仪, 我们调查了7个Y-STR基因座构成的单体型在中国云南白族133例和新疆维族105例无关男性个体中的分布。7个Y-STR基因座包括DYS456、DYS464 a/b/c/d、DYS527 a/b、DYS531、DYS709、DYS448和DYS522。结果显示,云南白族和新疆维族2个民族男性群体中,分别观察到133、105种单体型, 均为仅观察到1次的单体型,单体型多样性(HD)均趋近于1, 比较这种单体型在两个群体中的分布差异,显示有统计学显著意义(秩和检验: P<0.001)。中国云南白族和新疆维族7个Y-STR基因座具有较高的多态性, 为法医学实践和群体遗传学的研究提供了有用的基础资料。     

Experience in the application of Java Technologies in telemedicine

Java language has been demonstrated to be an effective tool in supporting medical image viewing in Russia. This evaluation was completed by obtaining a maximum of 20 images, depending on the client's computer workstation from one patient using a commercially available computer tomography (CT) scanner. The images were compared against standard CT images that were viewed at the site of capture. There was no appreciable difference. The client side is a lightweight component that provides an intuitive interface for end users. Each image is loaded in its own thread and the user can begin work after the first image has been loaded. This feature is especially useful on slow connection speed, 9.6 Kbps for example. The server side, which is implemented by the Java Servlet Engine works more effective than common gateway interface (CGI) programs do. Advantages of the Java Technology place this program on the next level of application development. This paper presents a unique application of Java in telemedicine.     

Study of dose-rate effects of neutron radiation in a wild-type and a repair-deficient yeasts saccharomyces

We report here a comparative analysis of RBE for lethality of a single pulse (duration 65 micros) of fast neutron with ultra high dose rates (up to 6 x 10(6) Gy/s) and continuous neutron radiation (3.6 x 10(3) s) of the pulse reactor BARS-6. Three diploid strains, one haploid strain and three diploid repair-deficient strains (rad52-1/rad52-1; rad54/rad54; rad2/rad2) were used. The RBE values (D(0gamma)/1D(0n)) of a single pulse and continuous neutron irradiation were equal (1.7-1.8) with maximum RBE (4.1-3.1) in region of low doses (shoulder region). Haploid cells were found to be more (3 times) sensitive to both gamma-rays and neutrons than the wild type. There was no obvious decrease in the RBE of 1.9 in highly sensitive haploid cells as compared with highly resistant diploid cells. The repair-deficient strains (rad52-1/rad52-1; rad54/rad54) were more (up to 10 fold) sensitive to both neutrons and gamma-rays as compared with their parent line. The RBE values of 1.5-1.7 of neutrons for these mutants (independent by of the mode of irradiation) were found. The repair-deficient mutant rad2/rad2 had similar sensitivity as a wild type and a RBE value was 2.0. We have concluded that biological effectiveness of the neutrons of pulse reactor BARS-6 was independent of the dose-rate, differing up to 10(8) fold. The RBE didn't vary significantly with the capacity of cells to repair DNA damages.     

TGF-β_2在低氧条件下诱导骨髓基质干细胞向软骨细胞分化的研究

目的：探讨转化生长因子β2（TGF-β2）在低氧条件下诱导骨髓基质干细胞（BMSCs）向软骨细胞分化的作用。方法：无菌条件下分离Wistar大鼠股骨骨髓,采用全贴壁培养法纯化BMSCs。传6代后,将细胞随机分为3组,A组加入25 ng/mL TGF-β2在1%氧浓度条件下培养;B组加入25 ng/mL TGF-β2在21%氧浓度条件下培养;C组仅加入含10%胎牛血清的DMEM-α培养液在1%氧浓度条件下培养。3周后,通过甲苯胺蓝染色检测细胞糖胺多糖,聚合酶链反应检测Ⅱ型胶原和蛋白聚糖（Aggrecan）的表达水平。结果：骨髓细胞经换液后贴壁聚集生长,形态均一,连续传代后形态无明显改变。分组培养第1周,A、C组生长速度低于B组;第2周各组均出现不规则形态细胞,A、C组细胞形态小于B组;第3周各组均可见透明样基质,以A组最明显。3周后行甲苯胺蓝染色,A组细胞内外均可见丰富的蓝染颗粒,B、C组染色较A组略浅。A组Ⅱ型胶原的表达相对量（1.246±0.287）高于B组（0.973±0.365）、C组（0.802±0.196）,差异有统计学意义（P〈0.05）;B、C组比较无明显差异（P〉0.05）。A组Aggrecan的表达相对量（0.833±0.375）高于B组（0.724±0.173）、C组（0.602±0.091）,差异有统计学意义（P〈0.05）;B、C组比较无明显差异（P〉0.05）。结论：TGF-β2联合低氧环境可明显促进骨髓基质干细胞分化为软骨细胞。     

The comparative analysis of gene and structural somatic mutations in inhabitants of Orel district areas contaminated with radionuclides as a result of Chernobyl accident

The results of comparative analysis of gene and structural mutations found in peripheral blood lymphocytes of inhabitants of Orel district areas contaminated with radionuclides as a result of Chernobyl accident are presented. The average level of 137Cs contamination in those areas ranged about 22-113 kBq/m2. In the study group was found the enhanced frequency of somatic cells with gene and structural mutations compared with laboratory control level by synchronous applying a T-cell receptor (TCR) loci mutation assay and cytogenetic analysis of unstable aberrations. The case-control comparison was carried out using the measured mutation frequencies and cases of various thyroid gland sickness recognized by ultrasonic examination. The cytogenetic assay did not show the statistical difference between healthy group and subjects with thyroid gland sickness. The average frequency of TCR loci mutation cells in the subjects with thyroid gland sickness was found to be statistically higher comparing with healthy persons. This finding was true for each study region and for Orel district in total. The subgroup of subject exposed in utero in 1986, soon after accident was analyzed. Both cytogenetic and TCR loci mutation assays shown enhancement of average mutation frequency in somatic cells in the subjects of this subgroup with thyroid gland sickness comparing with healthy persons.     

Determination of metabolic resistance mechanisms in pyrethroid‐resistant and fipronil‐tolerant brown dog ticks

Rhipicephalus sanguineus (Latreille) (Ixodida: Ixodidae) is a three‐host dog tick found worldwide that is able to complete its' entire lifecycle indoors. Options for the management of R. sanguineus are limited and its' control relies largely on only a few acaricidal active ingredients. Previous studies have confirmed permethrin resistance and fipronil tolerance in R. sanguineus populations, commonly conferred by metabolic detoxification or target site mutations. Herein, five strains of permethrin‐resistant and three strains of fipronil‐tolerant ticks were evaluated for metabolic resistance using synergists to block metabolic enzymes. Synergist studies were completed with triphenyl phosphate (TPP) for esterase inhibition, piperonyl butoxide (PBO) for cytochrome P450 inhibition, and diethyl maleate (DEM) for glutathione‐S‐transferase inhibition. Additionally, increased esterase activity was confirmed using gel electrophoresis. The most important metabolic detoxification mechanism in permethrin‐resistant ticks was increased esterase activity, followed by increased cytochrome P450 activity. The inhibition of metabolic enzymes did not have a marked impact on fipronil‐tolerant tick strains.