中国仓鼠细胞CTP合成酶cDNA的克隆及测序

用ＲＡＣＥ－ＰＣＲ方法合成了中国仓鼠细胞ＣＴＰ合成酶的ｃＤＮＡ，经克隆到载体并转化大肠杆菌。从大小不同的插入片段中筛选出一个１．３ｋｂ的片段进行测序。结果表明，此片段为ＣＴＰ合成酶的ＣＤＮＡ。     

Role of Endothelium/Nitric Oxide and Cyclic AMP in Isoproterenol Potentiation of 17ß-Estradiol-Mediated Vasorelaxation

Background: Calcitonin gene-related peptide (CGRP) is known to have an extremely potent and prolonged vasodilator effect on the coronary arteries. Studies have shown that CGRP increased coronary blood flow and alleviated reperfusion injury in vitro. It is still unknown, however, whether exogenous CGRP has a protective effect on the reperfusion heart associated with cardiopulmonary bypass (CPB). Methods: An in vivo porcine model of CPB was established. Twenty pigs, 10 controls and 10 CGRP used animals (CGRP group), were performed a median sternotomy followed by a standard CPB. All the hearts were arrested for 45 minutes. In the CGRP group, 1mg/kg CGRP was added into the cardioplegia, and another 1mg/kg was reperfused just before the aortic cross-clamp was removed. In both groups, myocardial microvascular perfusion, coronary arterial microvessel diameter and microvessel blood flow were detected by a laser doppler flowmeter and a contact microscope with TV monitor on five consecutive time perioperatively. Result: Myocardial microvascular perfusion was significantly higher and coronary arterial microvessel diameter was larger in the CGRP group on every point of time of reperfusion compared to those in the control group. In the CGRP group, microvessel blood flow also improved significantly than that in the control group during reperfusion. Conclusion: CGRP improves myocardial microcirculation during cardiac ischemia-reperfusion associated with CPB and could become a new, potent myocardial protector.     

促红细胞生成素对实验性肾性贫血的作用

促红细胞生成素(erythropoietin,EPO)是由肾细胞分泌的一种糖蛋白激素。从人胚肾细胞中诱导,经生物化学方法分离、提纯得到此品。本试验用5/6肾切除的方法造成大鼠慢性肾衰性(CRF)贫血,研究不同剂量EPO对CRF贫血的作用。结果表明EPO有显著的促进红细胞生成,改善CRF贫血状态,使其接近或达到正常水平,最佳剂量为1000 U/kg,并可预防实验性贫血,对正常鼠未见明显作用。     

骨髓间充质干细胞移植在肾脏疾病防治中的应用

目的:探讨骨髓间充质干细胞在肾脏疾病中的应用。方法:应用计算机检索中文科技期刊数据库1994-01/2007-06期间与骨髓间充质干细胞移植和肾脏疾病防治相关的文献,检索词"骨髓间充质干细胞、肾脏疾病",限定文章语言种类为中文。对资料进行初审,并查看每篇文献后的引文,文献所述内容应与骨髓间充质干细胞移植、难治性肾病、肾功能衰竭相关,且以近5年发表在较权威杂志者优先。排除重复性文章及Meta分析类文章。结果:①骨髓间充质干细胞具有多向分化潜能和可塑性,在特定的条件下可以向肾病大鼠肾脏的肾小球及间质细胞转化。骨髓间充质干细胞移植后可对肾功能等生化指标有明显改善作用。②同种异基因骨髓移植治疗IgA肾病患者后,清除了在系膜沉积的IgA分子。③在慢性马兜铃酸肾病中,骨髓造血干细胞特异标志物CD34~ 细胞减少,推测慢性马兜铃酸肾病发病机理可能与骨髓间充质干细胞受损相关。④骨髓间充质干细胞还可以重建损伤后的肾小球系膜,将骨髓移植后的小鼠制成肾小球肾炎模型,一周后观察发现有骨髓间充质干细胞向系膜细胞分化。结论:骨髓间充质干细胞可分化成为各种肾脏细胞,从而修复肾损伤,为未来解决肾小球损伤、肾小管坏死及其导致的急、慢性肾功能衰竭提供了一种新型的治疗方案。