IL-2联合银耳多糖激活的脾细胞对体外肿瘤细胞杀伤作用的研究

目的研究淋巴因子IL-2联合银耳多糖(Tremella Polysaccharide TP)共同激活的小鼠脾细胞对肿瘤细胞的体外杀伤作用.方法用甲基-3氢胸腺嘧啶核苷标记肿瘤细胞H22,B16,p815,将标记的靶细胞悬液调至1×105/mL,分别以效靶比40∶1,20∶1和10∶1加入效应细胞,混匀后置37℃5%CO2培养箱内培养2h,2h后用γ-闪烁记数仪对上述细胞悬液进行检测.结果 2种效应细胞对B16杀伤作用最强,H22次之,p815最弱,TP-LAK细胞的作用较之LAK细胞更强(P<0.05),且效靶比越高,杀伤作用越强.结论 IL-2激活脾LAK细胞是有效的抗肿瘤细胞,IL-2与银耳多糖在活化脾细胞提高抗肿瘤方面具有协同作用.     

Interleukin-17: a mediator of inflammatory responses

Interleukin-17 (IL-17) is a prototype member of a new cytokine family with six species identified to date. IL-17 is secreted mainly by activated CD4⁺ and CD8⁺ T lymphocytes, while its receptor is distributed ubiquitously. IL-17 has been classified as a proinflammatory cytokine because of its ability to induce the expression of many mediators of inflammation, most strikingly those that are involved in the proliferation, maturation and chemotaxis of neutrophils. Increased levels of IL-17 have been associated with several conditions, including airway inflammation, rheumatoid arthritis, intraperitoneal abscesses and adhesions, inflammatory bowel disease, allograft rejection, psoriasis, cancer and multiple sclerosis. This review provides an overview of IL-17 activities, concentrating on those that lead to neutrophil recruitment.Received 13 June 2003; received after revision 27 August 2003; accepted 1 September 2003     

间苯二酚——甲醛树酯的合成及其结构表征

对不同催化剂条件下合成的间苯二酚－甲醛树脂的＾１３ＣＮＭＲ谱进行分析，通过定量计算确定在不同催化剂下，间苯二酚－甲醛树脂中亚甲基主要连接方式的邻相接，并比较和探讨不同催化剂对间苯二酚苯环上不同位置碳的空出比例的影响，同时还寻找到利用快速经济简便的红外光谱取代＾１３ＣＮＭＲ谱确定催化剂对间苯二酚－甲醛树脂结构的影响。     

Protecting the terminus: t-loops and telomere end-binding proteins

Telomeric DNA is composed of a region of duplex telomeric tract followed by a single-strand overhang on the 3 G-rich strand. The DNA is packaged by proteins that associate directly with the single- and double-strand regions of the telomeric tract and by their associated proteins. This review discusses the evidence that G-strand overhangs are present on both ends of eukaryotic chromosomes and the steps needed to generate these overhangs. The overhangs are protected by specialized G-overhang-binding protein and/or invasion by the overhang of the duplex region of the telomeric tract to form a structure called a t-loop. The G-overhang-binding proteins identified from different species are described, and their properties compared. The data supporting the existence of t-loops at native telomeres is discussed, and the conditions required to promote their in vitro formation are presented.     

~(13)C-NMR-研究丁腈羧液体共聚物序列结构

用~(13)C—NMR方法研究了端羧基丁二烯-丙烯腈液体共聚物的序列分布和微观结构。结果指出,丙烯腈单体主要以BAB三元组形式存在,并给出了定量数据。     

边带全抑制和偶极相移技术在~(13)C固体高分辨核磁共振中的应用

应用交叉极化、魔角旋转、边带金抑制和偶极相移技术,可以从固体~(13)C核磁共振谱中区分出非质子碳的信号。本方法为复杂的天然高分子聚合物,如煤、生油岩干酪根等的结构分析提供了有效的手段。     

急、慢性有氧运动对白介素的影响

目的:观察急、慢性有氧运动后大鼠血液白介素IL-2和IL-6的变化情况,探讨运动后白介素的应答、适应性反应.方法:120只3月龄SD大鼠随机分为急性运动组和四周运动组,跑台速度为25m/min的恒定负荷.各组运动前、运动后即刻和运动后3h取血,采用放射免疫法检测大鼠血液中IL-2和IL-6的变化情况.结果:1、一次急性运动后,与安静对照组相比,IL-6的浓度在运动后即刻、运动后3h均出现升高的趋势,但没有统计学意义(P0.05).IL-2浓度的变化与IL-6相似,运动后即刻有所下降,3h后虽有回升,但无统计学意义(P0.05).2、4周有氧耐力运动对白介素的影响:1周有氧耐力训练后,WK1-B,WK1-A,WK1-3h与C组相比,大鼠血液中IL-6的浓度显著升高,差异非常显著(P0.01).WK1-3h组与WK1-B组相比,IL-2的浓度有明显升高(P0.05),而与WK1-A组相比,有非常显著性差异(P0.01).有氧耐力运动两周后,WK2-B,WK2-A和WK2-3h组大鼠的IL-6水平与C组有显著的升高(P0.05).两周的有氧耐力使IL-2浓度在WK2-B组较C组有明显的升高现象,差异非常显著(P0.01).WK2-A组与C组相比,IL-2浓度变化不明显(P0.05).WK2-3h组与WK2-B组相比,IL-2浓度有显著升高(P0.05)第三周和第四周大鼠IL-2和IL-6的浓度变化不明显,与安静对照组相比,没有显著性差异(P0.05).结论:一次性有氧运动对大鼠白介素的影响不明显,白介素在急性运动后的变化情况与运动强度大小可能有关.周期性有氧耐力训练促进大鼠机体产生良好的适应性,白介素呈"升高-下降"的变化趋势,1-2周是免疫应激阶段,3-4周大鼠机体实现了良好的免疫调节,处于适应阶段.     

东、中亚干旱--半干旱区全新世湖泊沉积w (TOC)与δ13 Corg意义的阈值问题

选择了东、中亚干旱?半干旱区14个湖泊全新世沉积物的w(TOC)和δ13Corg纪录,探讨了TOC及其不同沉积阶段对δ13 Corg变化的影响及两者的关系,为δ13 Corg在古气候研究中的正确使用提供依据。结果表明：湖泊沉积物δ13Corg的变化在一定程度上受控于w(TOC)。该区域湖泊沉积物w(TOC)相对于δ13Corg变化存在相应阈值,不同阈值区间代表TOC的不同沉积模式,不同沉积模式下w(TOC)和δ13Corg 的关系不同。 w(TOC)较低或较高时,两者均无对应关系,可能是有机质受到不稳定的沉积环境影响;不同湖泊主导有机碳沉积的模式不同;δ13 Corg在相应TOC的重沉积埋藏模式下可能与气候变化有关,因此在利用δ13 Corg解释气候变化时应结合有机质沉积阶段进行分析。