酵母蛋白质网络的动力学性质

蛋白质-蛋白质、蛋白质-DNA相互作用网络决定了细胞中各种关键功能的执行．基于芽殖酵母(budding yeast saccharomyces cerevisiae)的蛋白质-蛋白质相互作用网络数据和相关的实验文献，我们建立了调控细胞周期和生命周期(cell cycle and life cycle)的蛋白质网络，并利用离散模型研究了该网络的动力学性质，研究表明：细胞周期网络的动力学性质具有很强的稳定性，约94％的蛋白质初态将演化到对应于生物学G1基态的稳定态，使其成为惟一的全局吸引点；同时，绝大多数的初态的演化路径都通过由G1激发态到G1基态的细胞周期演化路径，使细胞周期路径成为全局性的“吸引”路径。     

硝酸镧对大鼠肝脏癌前病变发展的抑制作用及机制的初步探讨

研究硝酸镧对大鼠肝脏癌前病变的抑制作用及机制. 采用肝癌发生的短期动物模型, 连续用0.2, 10 mg·kg-1的La(NO3)3灌胃2个月后, 观察了不同剂量La(NO3)3对大鼠肝脏形态结构的影响, 免疫组化技术检测肝脏中细胞周期素D1和P16及PCNA的表达, 并做半定量分析. 同时取脾细胞进行淋巴细胞转化率试验. 结果表明, 0.2 mg·kg-1剂量硝酸镧组动物健康状况明显改善, 肝癌前病变程度明显减轻, cyclinD1, PCNA表达下降, P16表达上升, 淋巴细胞转化率升高. 提示低剂量硝酸镧具有一定阻抑肝癌前病变的作用.     

新型铂(Ⅱ)类配合物的合成、表征和抗肿瘤活性

Seven novel platinum(Ⅱ) complexes[Pt(Ⅱ)(NH₃)(H₂O)X](Ⅰ～Ⅶ) {X=(COO^-)₂(oxalato), 2p-CH₃O-C₆H₄-COO^-(p-methyoxbenzolato), 2C₆H₅-COO^-(benzolato), 2CH₃COO^-(acetato), (CH₂)(COO^-)₂(malonato), (CH₂)₂(COO^-)₂(succinato), (CH=CH)(COO^-)₂(maleato)} have been prepared and characterized by elemental analysis, thermal analysis，IR, UV, and ¹H NMR spectroscopy. The antitumor activities of these complexes in vitro against EJ、HCT-8, KB, BGC-823, Bel-7402, HL-60, MCF-7 and Hela cell lines have been studied. Complex Ⅰ and Ⅴ show remarkable antitumor activities against EJ cell line, and the inhibitory rate is 45.96% and 54.32% at concentration of 10 μmol·L^-1, respectively. The inhibitory rate of the complexes Ⅱ and Ⅲ is greater than 50% against HL-60, BGC-823, KB and EJ cell lines. The inhibitory rate of the complex Ⅵ is 51.89% and 57.96% against BGC-823 and EJ cell lines. The complexes Ⅳ and Ⅶ have no antitumor activities against tested tumor cell lines. The complexes Ⅱ, Ⅲ and Ⅵ can stem the cell cycle of HL-60 on the G₂+M.     

氨·环己胺·羧酸根合铂(Ⅱ)类配合物的合成、抗肿瘤活性和与DNA的键合水平

本工作设计合成了6种新型氨·环己胺·羧酸根合铂(Ⅱ)类配合物[Pt(NH₃)((?)-NH₂)X₂](a～f){其中，X=CH₃COO^-(乙酸根)，CH₂ClCOO^-(氯乙酸根)，C₆H₅-COO^-(苯甲酸根)，p-CH₃O-C₆     

Effects of hyaluronic acid－chitosan－gelatin complex on the apoptosis and cell cycle of L929 cells

With the development in the field of tissue engineering, the interaction between biomaterials and cells has been deeply studied. Viewing the cells seeded on the surface of materials as an organic whole, cell cycle and apoptosis are analyzed to deepen the study of cell compatibility on biomaterials, while cell proliferation and differentiation are studied at the same time. In this paper, hyaluronic acid is incorporated into the chitosan-gelatin system. Propidium iodide (PI) was used in cell cycle analysis and the double-staining of cells with annexin-V and PI was applied in cell apoptosis analysis. The results show that incorporated hyaluronic acid shortens the adaptation period of cells on the material surface, and then cells enter the normal cell cycle quickly. In addition, added hyaluronic acid inhibits cell apoptosis triggered by the membranes. Therefore, hyaluronic acid improves the cell compatibility of chitosan-gelatin system and benefits the design of biomimetic materials.     

水生动物细胞周期蛋白研究进展

细胞周期蛋白是真核细胞周期循环中主要的调控因子，参与细胞周期的精密调控，维持细胞正常生长及发育平衡．本文简述了细胞周期蛋白与水生动物卵子发生、早期胚胎发育的关系以及细胞周期蛋白在生殖过程的表达与调控．     

青蒿琥酯抑制胃癌细胞的作用机制

目的:在胃癌细胞系SGC-7901和HGC-27中探究青蒿琥酯的抗肿瘤效应并探讨其潜在的分子机制.方法:CCK-8实验检测不同浓度青蒿琥酯干预后两种胃癌细胞的增殖活力;Annexin V/PI双染流式细胞仪检测细胞凋亡情况,流式周期试剂盒检测细胞周期分布,Transwell实验测定细胞的迁移和侵袭能力变化,Wester...     

人CtBP2与CCNH相互作用的初步研究

CtBP2(E1AC-terminal binding protein 2)作为辅阻遏物与多种转录因子联系而参与到很多生物过程中,如细胞分化、凋亡、发育和肿瘤发生等,然而其中许多作用机制尚不明了.为了对CtBP2进行深入研究,利用高通量酵母双杂交技术,以人CtBP2为诱饵,与含有1000个人肝基因克隆的酵母双杂交文库进行接合筛选获得了一个与它相互作用的猎物蛋白CCNH(Cyclin H).通过GST-pull down、免疫共沉淀和亚细胞共定位等实验进一步证明了这两个蛋白在体外和体内的相互作用.     

微生物所发表细胞周期调控最新研究成果

[微生物研究所]近日，中科院微生物所百人计划引进人才叶听研究员课题组通过研究，发现了与细胞周期调控的关键调控分子Cyclins／Cdks新相互作用蛋白-锚蛋白Ankrd17，研究结果发表在Journal of Biological Chemistry 284期第12卷上。