Cu（Ⅱ）—稀土异双核配合物的研究

利用液相化学合成技术，成功制备了六种含草酰胺桥的新型异双核配合物Ｃｕ（ｏｘａｐ）Ｌｎ（ｐｈｅｎ）２（ＣｌＯ４）３（Ｌｎ：Ｙ，Ｃｅ，Ｐｒ，Ｅｕ，Ｇｄ，Ｙｂ）。基于元素分析、红外光谱、电子光谱、ＥＳＲ谱及变温磁化率等测试手段对这些异双核配合物进行了表征。测定了Ｃｕ（ｏｘａｐ）Ｇｄ（ｐｈｅｎ）２（ＣｌＯ４）３的变温磁 （４．２－３００Ｋ），对由自旋Ｈａｍｉｌｔｏｎｉａｎ算符Ｈ＝－２ＪＳ１．Ｓ２导出的磁方     

Crystal structure, magnetic and photoelectric properties of coordination polymer[ Co2（C3H4N2）4（ C10H2O8） ]n

The coordination polymer is designed and synthe-sized through the choice of organic ligand and coordina-tion geometry of metal ion as well as the control over theinfinite network topology structure, which usually con-tains both the characteristic of the organic molecules andmetal ions. So, it exhibits more singular function and haspotential application in optics, electrics, information, ca-talysis, medicament, metallurgy, novel material and lifesciences fields. And it has been the confluence m…     

血管紧张素Ⅱ及其受体在动脉粥样硬化中的作用

观察不同浓度血管紧张素Ⅱ及其受体在氧化低密度脂蛋白(OXLDL)内皮受体LOXI基因表达中的作用，且探讨其机制，应用反转录聚合酶链反应(RT-PCR)法。结果表明，血管紧张素Ⅱ能够上调LOXI的mRNA水平，并存在剂量依赖性应用Ⅰ型血管紧张素Ⅱ阻断剂Losartan能抑制血管紧张素Ⅱ对LOXI的上调作用、血管紧张素Ⅱ可显著上调LOXIl的基因表达，此作用是通过激活血管紧张素Ⅰ型受体实现的。     

[Cu(tet a)(NCS)2]的合成和晶体结构

单晶X-射线结构分析测得，标题化合物的分子式为C18H36N6S2Cu．在这个配合物中，围绕着Cu(II)原子有两种无序的配位几何，较小的组分占整个结构的43．7(9)％，该组分是中心对称的，其中心是四个氮组成的四方形，四方形的中心是与四个氮原子在同一个平面上的铜原子．较大的组分占整个晶体的56．3(9)％，是一个中心对称拉长的八面体．     

Platelet-derived growth factor receptor-β in myocyte was upregulated by angiotensin Ⅱ

To observe the regulation of platelet-derived growth factor (PDGF) receptor-βin myocyte stimulated by angiotensin II (AngII) at both integrated and cellular levels and reveal the signal transduction mechanism in cell, two kidneys, one clip (2K1C) renal hypertension were performed by placing a sliver clip around the left renal artery. Blood pressure and the ratio of left ventricular weight to body weight were measured at 4 and 8 weeks after operation. The content of AngII in heart was detected by radioimmunology assay; the protein level of PDGF receptor-βin heart was measured by Western blot analysis. The alteration of PDGF receptor-βstimulated by AngII and several inhibitors was observed on cultured neonatal rat ventricular myocyte (NRVM). The content of AngII in heart of 2K1C renal hypertensive rat at 4 and 8 weeks after operation was increased. Compared with sham group, 4 and 8 weeks after operation, PDGF receptor-βin heart of 2K1C group was upregulated by 100.3% and 127.1% (P < 0.05), respectively. This upregulation could be inhibited by captopril. For cultured myocyte, PDGF receptor-βwas increased by 47.1% after being stimulated by AngII and this upregulation could be inhibited by losartan which was an inhibitor of AT1 receptor. PLC inhibitor (U73122) and MEK inhibitor (PD98059) could partly inhibit PDGF receptor-βupregulation induced by AngII. These results suggested that AngII could upregulate PDGF receptor-βin myocyte by its AT1 receptor and this effect was at least partly dependent on PLC and extracellular signal-regulated kinase (ERK).     

Effects of collagen types II and X on the kinetics of crystallization of calcium phosphate in biomineralization

The effects of the components of cartilages matrix on the process of endochondral ossification and the kinetics of crystal growth of calcium phosphate have been studied in the presence of type II or X collagen. During the experiments, type I collagen was added as the seed material. FT-IR analysis shows that calcium phosphate crystallized on the surface of type I collagen was mainly hydroxyapatite. Both type II and X collagens could reduce the growth rate of calcium phosphate crystals, and the effect of type X collagen is more obvious. The reaction was in the fourth order in the presence of type II collagen. The results showed that type II or X collagen had the ability to make Ca2+ accumulate in the process of endochondral ossification, but has little effect on crystal growth and the product of biomineralization.     

两种内皮细胞分泌血管紧张素Ⅱ的差异

为进一步了解血管内皮细胞 (VEC)在代谢特征上的异质性 ,加深对VEC生物学特性的认识 ,文中应用平行平板流动腔装置 ,将人胚肾小球血管内皮细胞 (HGVEC)和牛肺动脉内皮细胞 (BPAEC)两种不同的EC在同样的剪切流环境中剪切作用 2 4h ,利用放射免疫法检测循环液中血管紧张素II(AngII)分泌量。结果表明 ,HGVEC的AngII平均分泌率 ( 7.5 4± 0 .2 7)pg (cm2 ·h)显著高于BPAEC( 6 .0 8± 0 .11)pg (cm2 ·h) ,且HGVEC的AngII平均分泌率随剪切时间的增加而减少 ,在各时点间的变异相对较大 ;而BPAEC的AngII平均分泌率在各时点的分泌率较为稳定 ,变幅较小。表明这两种内皮细胞在AngII分泌特性上存在异质性。     

扩展桥联双核铜(Ⅱ)体系的磁耦合机理

应用密度泛函理论,采用对称性破损方法研究了草酸根桥联及草酰胺桥联双核铜（Ⅱ）体系的磁耦合作用机理.结果表明:两磁中心的自旋布居大小相等,符号相反,二者之间为反铁磁耦合.而且,与磁中心相联的配体原子与磁中心具有相同符号的自旋布居,磁中心的自旋具有显著的离域效应.HOMO中磁中心未成对电子的占据轨道之间对称性和能级的匹配程度是影响磁耦合强弱的关键.当对称性匹配时,改变桥联基团占据轨道的能级,例如通过改变桥接原子的电负性,即可改变磁耦合作用的强度,电负性愈低,磁耦全作用愈强.当对称性不匹配时,体系中存在较弱的磁耦合.     

木犀草素抑制AngiotensinⅡ诱导的心肌细胞肥大

摘要 目的 研究木犀草素对血管紧张素Ⅱ诱导乳鼠心肌细胞肥大的作用。方法 用1到3天新生大鼠分离心肌细胞;用徕卡倒置显微镜抓获心肌细胞图像以测量细胞直径;用BCA蛋白检测法测定心肌细胞蛋白质含量;以[3H]苯丙氨酸掺入法测定心肌细胞的蛋白质合成率。结果 0.1 μM血管紧张素Ⅱ引起了心肌细胞直径、蛋白含量和心肌细胞蛋白质合成速率的显着增加。木犀草素预处理可剂量依赖性的减小由Ang II刺激而引起的乳鼠心肌细胞直径、蛋白质含量和蛋白质的合成速率增加。结论 结果表明,木犀草素可有效抑制血管紧张素Ⅱ诱导的心肌细胞肥大。