Chemical components of the roots of Noni (Morinda citrifolia) and their cytotoxic effects

Roots of Morinda citrifolia (Noni or Yor in Thai) have been used traditionally for thousands of years to treat chronic diseases such as cancer and heart disease. In this study, three new anthraquinones together with 15 known compounds were isolated from the roots of M. citrifolia (Rubiaceae). Their structures were established by spectroscopic methods, particularly 1D and 2D NMR techniques. Six known compounds, together with two new compounds (2 and 3) showed significant inhibitory effects on the proliferation of human lung and colon cancer cells.     

大花蕙兰原球茎诱导培养影响因素及褐化防治的研究

[目的]研究大花蕙兰茎尖外植体原球茎诱导及增殖培养、褐化污染的影响因素。[方法]以大花蕙兰茎尖作为外植体,研究无菌系建立、诱导培养的灭菌方法与褐化防治、原球茎诱导培养初始培养基的筛选、原球茎增殖培养的影响因素。[结果]结果表明:解决茎尖内生菌污染及褐化严重的问题,两段式灭菌(75%酒精30 s+0.1%升汞10 min+剥去幼叶+0.05%升汞5 min)优于单一式的灭菌;原球茎诱导培养基为1/2MS+2.0 mg/L 6-BA+0.2 mg/L NAA;原球茎增殖培养基为1/2MS+2.0 mg/L 6-BA+0.2 mg/L NAA+2.0 g/L活性炭+10%马铃薯。[结论]该研究可为大花蕙兰的茎尖快速繁殖及工厂化生产提供技术依据。     

IGF对前体脂肪细胞增殖分化影响的研究进展

脂肪细胞与动物生产中生产性能以及人的肥胖，糖尿病等疾病密切相关，因此近年脂肪细胞增殖与分化成为一个研究热点，在增殖与分化过程中需要多种生长因子，其中IGF与其他生长因子不一样，它通过同一个受体既能促进增殖又能促进分化，表现出看似矛盾的两种不同作用，本文对IGF与脂肪细胞增殖分化方面的研究作一综述。     

Effects of uremic serum on the proliferation and trans-differentiation of human renal tubular epithelial cells

AIM: To explore the effects of uremic serum on proliferation and trans-differentiation of human renal tubular epithelial cells. METHODS: Human renal tubular epithelial cell line (HK-2) was cultured in RPMI-1640 medium. The proliferation effects of uremic serum at different concentrations were evaluated by methylene blue assay (MTT method) and flow cytometry. The positive cells percentage of α-smooth muscle actin(α-SMA)in different concentration uremic serum medium was also measured by flow cytometry in vitro. RESULTS: Absorbance 490 (A₄₉₀) was increased in 5%-20% uremic serum groups compared with that in normal controls with the use of MTT. Cells in G₁ phase were decreased, but proliferation index (PI) was increased in 10%-20% uremic serum groups compared with that in normal controls with the use of flow cytometry. No significant difference of cell proliferation index was found among uremic serum groups. The positive percentage of α-SMA cells was increased significantly in uremic serum groups compared with that in normal controls, and increased in parallel with the increasing of uremic serum concentration. CONCLUSION:These data suggest that AGEs could induce a high expression of MIP-1αm RNA and protein in cultured HUVECs in a dose-dependent and time-dependent manner.     

胶质瘤中survivin蛋白的表达及其生物学意义

目的：探讨survivin蛋白在胶质瘤中的表达情况及其与增殖指数、凋亡指数和微血管密度的相关性。方法：采用S-P法检测胶质瘤56例和正常脑组织8例中survivin蛋白、Ki67和FⅧRAg的表达,肿瘤细胞的凋亡采用TUNEL检测,并结合病理特点进行分析。结果：Ⅰ～Ⅱ、Ⅲ、Ⅳ级胶质瘤中,sur-vivin蛋白的表达率分别为25.3%、56.8%、83.2%,组织学分级之间差异有显著性（P〈0.05）;survivin表达阳性者的Ki67、微血管密度明显高于survivin阴性者,而其凋亡率则低于survivin阴性者,差异有显著性（P〈0.05）;正常脑组织中未见survivin表达。结论：Survivin在胶质瘤中高表达,与其恶性程度、凋亡、增殖活性及血管生成密切相关。     

红肉苹果的组织培养快繁技术

[目的]建立红肉苹果的高效植株再生体系。【方法]以红肉苹果的茎尖和带腋芽的茎段为外植体，通过组织培养试验筛选出最佳的灭菌时间、基础培养基、增殖培养基和生根培养基。[结果]随着消毒时间的延长，外植体的污染率明显下降，但外植体受到的伤害显著增加。用0．1％HgCl2灭菌5rain的外植体生长正常，污染率仅为3．3％。在增殖培养基MS＋6一BA0．5mg／L＋NAA0．1mg／L、MS＋6．BA0．5mg／L＋NAA0．2mg／L和MS＋6一BA0．5mg／L＋NAA0．5mg／L中。每个外植体平均增殖不定芽4．1、6．8和3．3个。在生根培养基1／2MS＋0．1mg／LIBA＋0．1mg／LNAA、1／2MS＋0．2mg／LIBA＋0．2mg／LN从和1／2MS＋0．5mg／LIBA＋0．5mg／LNAA上幼苗的生根率分别为56．7％、96．7％和83．3％。[结论]该研究为红肉苹果的快速离体扩繁和工厂化育苗以及园林应用奠定了良好的基础。     

水稻发育胚乳中细胞增殖与细胞分裂素含量的关系

依据水稻强、弱势粒胚乳细胞增殖速率的差异,6个供试品种(含杂交稻组合、新株型品系)可分为3种类型：快速同步增殖型、异步增殖型和缓慢同步增殖型。发育胚乳中玉米素(Z)+玉米素核苷(ZR)含量明显高于异戊烯基腺嘌呤(iP)+ 异戊烯基核苷(iPA)含量,但两类细胞分裂素含量的变化趋势一致,且与胚乳细胞增殖速率有密切联系。胚乳     

Immunostimulatory effects of human recombinant interleukin-12 on peripheral blood mononuclear cells from normal dogs

Interleukin-12 (IL-12) plays a pivotal role in regulating cellular immune responses involving autoimmunity, infectious disease, and cancer. Human recombinant (hr) IL-12 is being evaluated for therapy of human cancer. We investigated the potential of hrIL-12 to activate canine peripheral blood mononuclear cells (PBMC) using proliferation and cytotoxicity as readouts. Human rIL-12 caused increased proliferation of PBMC, and enhanced lysis of allogeneic canine tumor targets mediated by PBMC from normal dogs in vitro. In addition, antibody-dependent cellular cytotoxicity (ADCC) mediated by canine PBMC was enhanced by hrIL-12. These results indicate that hrIL-12 is recognized by canine immune cells, triggering a number of immune responses in canine PBMC, that may be important for immunotherapy of canine cancer. Information from this investigation provides impetus for evaluation of the effects of hrIL-12 on PBMC from tumor-bearing dogs and should be helpful in the development of hrIL-12 as an immune cell activator in vivo in the dog.     

IGF-I对体外培养山羊卵泡颗粒细胞增殖与分化的影响

为弄清ＩＧＦ－Ｉ在山羊卵泡不同发育阶段对颗粒细胞增殖与分化的影响,分类采集山羊小腔和大腔卵泡颗粒细胞进行体培养,对培养后颗粒细胞的ＤＮＡ含量和孕酮分泌量进行测定。结果表明,ＩＧＦ－Ｉ对来源于大,小卵颗粒细胞的增殖与分化都有促进作用。     

球根秋海棠的快速繁殖及简化培养基的应用

采用球根秋海棠的幼茎,花瓣和花梗作为外植体,以Ｍｓ为基本培养基,并附加细胞分裂素ＢＡ或激动素ＫＴ以及生长素ＮＡＡ或２,４－Ｄ,通过１个月的培养,获得愈伤组织,芽的诱导在附加ＢＡ２ｍｇ／１＋ＭＡＡ０．５ｍｇ／ｌ＋间苯三酚１ｍｇ／ｌ的Ｍｓ培养基上获得最高分化率。