RGD肽类似物的合成及活性测定

 目的合成RGD(精氨酸-甘氨酸-天门冬氨酸)肽类似物-AoGDw(ω-氨基辛酸-甘氨酸-天门冬氨酸-色氨酸),研究其结构对血小板聚集功能的影响。方法采用固相法合成AoGDW,经Sephadex G-10纯化,RP-HPLC(反相高效液相色谱法)、质谱和氨基酸组成分析对其进行鉴定,并采用比浊法测定其抗血小板聚集的活性及稳定性。结果获得了纯度为98.3%的目的肽、质谱和氨基酸组成分析结果均与理论值一致。AoGDW及对照组抑制血小板聚集的IC₅₀分别为(4.7l±2.51)和(61.82±8.08)μmol·L^-1在血浆中孵育3 h,仍保持100%的活性。结论AoGDW具有更强的抗血小板聚集的活性及稳定性,说明与RGD序列紧邻的氨基酸残基对其功能有重要的影响。     

谷丙甘氨酸胶囊治疗慢性非细菌性前列腺炎86例

慢性非细菌性前列腺炎好发于中青年,临床常见,治疗比较困难.我院于2007年9月-2007年12月应用谷丙甘氨酸胶囊治疗非细菌性前列腺炎86例,效果良好,现报道如下.     

稳定表达GlyRα1的HEK293细胞系的建立

目的:建立稳定表达甘氨酸受体α1亚基(GlyRα1)真核表达载体的人胚肾细胞(HEK293)细胞系.方法:构建pcDNA3.1-GlyRα1真核表达载体,应用脂质体介导的转染技术将该质粒导入HEK293细胞,再用G418筛选表达稳定的细胞系.真核细胞中GlyRα1的表达分别用RT-PCR与Western blot方法检测.结果:在7株转染并经G418反复筛选的HEK293细胞系中,有4株细胞系明显表达GlyRα1的mRNA及其蛋白质,其余3株细胞表达较弱或者没有表达.结论:用pcDNA3.1-GlyRα1转染的HEK293细胞经G418筛选,可成功建立GlyRα1稳定表达系.     

甘氨酸亚铁改善大鼠营养性贫血的效果评价

目的　以缺铁大鼠为模型研究了甘氨酸亚铁改善营养性贫血的效果。方法　选择体重5 0 (6 0克二级雌性断乳Wistar大鼠,给予低铁基础饲料耗空3周后,经尾静脉取血,测定血红蛋白含量,按尾血血红蛋白含量,把动物随机分为空白对照组、给予低剂量组、中剂量组、高剂量甘氨酸亚铁组和乳酸亚铁对照组,实验期为4周,测定动物生长发育指标和缺铁性营养性贫血相关指标。结果　补充甘氨酸亚铁显著改善大鼠生长,补充组的终体重和净增重显著高于低铁对照组;甘氨酸亚铁显著升高贫血大鼠的血红蛋白水平,而红细胞内游离原卟啉水平显著降低,补充甘氨酸亚铁组的脾脏铁含量和总铁含量均显著高于低铁对照组,并且与相同剂量的乳酸亚铁相比没有显著差异。结论　甘氨酸亚铁作为一种较理想的补充铁的营养强化剂,可明显改善缺铁性营养性贫血。     

脑内Glycine受体的结合特性与甾体激素相关性研究

目的研究甾体激素对脑内Glycine受体结合的影响。方法制备大鼠脑突触质膜,排除胞液污染,用放射配体结合的方法,以[3H]甘氨酸为标记配体。结果测出甘氨酸受体结合的饱和曲线,Scatchard作图为一条直线,结合容量Bmax为每毫克蛋白(26±4)pmol,平衡解离常数Kd为(173±15)nmol.L-1,士的宁取代实验显示:脑干部甘氨酸受体为士的宁敏感型,其余脑部为士的宁不敏感型。甾体激素取代实验显示:孕酮对甘氨酸受体的结合有快速的抑制作用。结论孕激素对甘氨酸受体的结合有影响。     

创伤性休克大鼠肝组织HSP70 mRNA表达变化及甘氨酸的干预影响

目的观察创伤性休克大鼠肝组织HSP70 mRNA表达变化及甘氨酸的干预影响。方法检测甘氨酸治疗组、休克组和对照组肝组织HSP70 mRNA表达；观察肝组织病理改变并测定血清ALT和AST水平。结果休克组和治疗组肝组织HSP70 mRNA表达分别于复苏后6、12h达高峰。血清ALT、AST随时间延长逐渐增高；光镜下病理改变也随时间延长而损害加重。与休克组比较，治疗组肝组织HSP70 mRNA表达明显增强、血清ALT和AST明显降低且肝组织光镜下病理损害明显改善（P均〈0．05）。结论甘氨酸可增强肝组织HSP70表达，减轻创伤性休克后继发的肝脏损害。     

均匀设计用于优选环已烯甘氨酸与苯甘氨酸的液相分离条件

运用均匀设计,结合关联度分析和回归分析,借助计算机考察了头孢拉定(头Ⅵ)中间体环已烯甘氨酸(DHPG)及其杂质苯甘氨酸(PHG)的液相分离条件,通过三因素实验,得到了令人满意的结果。     

Effects of glycine and methylprednisolone on hemorrhagic shock in rats

Background Methylprednisolone (MP), a synthetic glucocorticosteroid, has been broadly studied in experiments on endotoxin-induced shock and septic shock. This study was designed to ascertain whether glycine and MP can protect against organ injury and death caused by hemorrhagic shock, and to elucidate the underlying mechanisms of these protective effects in rats.Method To establish a shock model, Wistar rats were bled to maintain mean arterial pressure at 30-50 mmHg for 1 hour and subsequently resuscitated with the shed blood and normal saline. Just prior to resuscitation, the rats were randomly assigned to four groups: sham group (operation performed without inducing shock), shock group, shock+glycine group (glycine injected at the beginning of resuscitation) and shock+MP group (MP injected at the beginning of resuscitation).Results ① Seventy-two hours after resuscitation, the survival rate of rats from the shock group had decreased to 20%, while the survival rates of rats from the shock+glycine and shock+MP groups were 77.8% and 80%, respectively. The difference was significant (P<0.05). ② Eighteen hours after resuscitation, pathological alterations in the organs of the rats were apparent. In rats from the shock group, edema, interstitial leukocyte infiltration, and cellular degeneration occurred in the liver, lungs, kidneys, and heart. Glycine and MP reduced these pathological changes significantly. ③ Eighteen hours after resuscitation, the levels of creatine phosphokinase, transaminases, and creatine were elevated significantly in rats from the shock group, indicating injury to the heart, liver, and kidneys, while these levels were elevated only slightly in the shock+glycine and shock+MP groups. The differences were significant (P<0.01). ④ There were significant increases in intracellular calcium and production of tumor necrosis factor (TNF-α) by isolated Kupffer cells stimulated by endotoxin after hemorrhagic shock. These changes were completely prevented by glycine and MP (P<0.01). Conclusion Glycine and MP reduce organ injury and mortality caused by hemorrhagic shock by preventing increase of intracellular calcium levels in Kupffer cell, suppressing Kupffer cell activation, decreasing the production of TNF-α by Kupffer cells, and blocking systemic inflammatory responses.     

1.5%甘氨酸冲洗液——泌尿系内窥镜术中的新型冲洗剂

甘氨酸冲洗液(Glycine Irrigation)是一种非离子性制剂,又是一种泌尿系内窥镜手术中配套的无菌冲洗剂。 本品是按美国 Travenol公司产品“Glycine UrologicalIrrigating Solution”处方,配制成1.5％甘氨酸冲洗液,用2000ml塑料袋包装并配有专用导管,供泌尿系内窥镜术中临床冲洗用。 近20多年来,电子技术的进步,带动了内窥镜技术的发展。内窥镜手术在临床广泛应用,它对减少患者病痛及早日康复具有深远意义,也深受患者欢迎。泌尿系内窥镜手术必须在配套冲洗液下进行,这是不同于其它内窥镜的差异,过去用5％葡萄糖注射液或甘露醇等渗溶液作冲洗剂,在手术视野,残留物清除和对组织损伤等方面带来了一定影响,因此,对泌尿系内窥镜电切手术冲洗液提出特殊的要