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一氧化氮对悬浮红细胞变形性的影响机制研究

发布时间:2018-06-07 02:06

  本文选题:一氧化氮 + 红细胞变形性 ; 参考:《泸州医学院》2012年硕士论文


【摘要】:一氧化氮(NO)在生物体内作为一种反应性极强的自由基,具有广泛的生理作用。NO通过结合红细胞血红蛋白(Hb)中保守的β~(93)Cys残基(Hbβ~(93)Cys)形成S-亚硝基血红蛋白(SNO-Hb)。而Hb分子内NO能从血红素转移至Hbβ~(93)Cys巯基,调节NO的贮存与释放,介导血管舒张。库血红细胞随着保存时间的延长,NO会发生大量流失,输入体内后红细胞的扩血管活性、变形能力及血红蛋白携氧能力等生理活性下降。因此,了解红细胞存储过程中NO的流失问题,认识NO在循环系统中的作用机理,对保障红细胞输注的安全性和有效性具有极其重要理论意义和临床价值。本研究拟通过体外补充NO来改善库存悬浮红细胞的形态和功能,,探讨NO对红细胞形态学及储存损伤的影响机制,为红细胞的有效保存,提供可参考的理论依据。目的:本次实验对保存期间的悬浮红细胞补充不同浓度梯度的NO试剂:L-Arginine(L-精氨酸/NO前体),分析检测悬浮红细胞不同保存时相的红细胞内NO量的改变及红细胞变形性等相关指标,以期探讨NO对库血悬浮红细胞变形性的影响机制,从而进一步评价储存悬浮红细胞的储存质量。 方法:取10例各1u新鲜悬浮红细胞,4℃保存,试验前分别取出4mL于无菌试管,总计500管,进行编组编号,保存于专用储存冰箱内。在储存的不同时相(3h、1d、3d、5d、7d、14d、21d、28d),每例样本各取5管,其中1管不做处理,为对照组(A组),另外4管分别和不同浓度L-精氨酸(NO前体)混合培养,浓度分别为1μM(B)、5Μm(C)、10Μm(D)、50Μm(E)。培养1小时后测定观察指标。主要有:(1)红细胞变形性相关指标:血液高切粘度、低切粘度、卡松粘度、血浆粘度、红细胞变形指数、聚集指数、刚性指数:(2)NO荧光探针检测:通过测定平均荧光强度(PKPosX)反应红细胞内的一氧化氮水平。 结果:保存期内对照组和实验组红细胞变形指数、聚集指数和刚性指数均随着时间延长而逐渐增高,且变化显著。对照组高切相对粘度在存放1d后出现升高,随后维持相同数值,递增趋势不明显;低切粘度在3h—5d期间无显著差异,14d-21d期间持续升高;卡松粘度在(5d、7d、14d、21d)时间点呈逐渐升高的趋势。当NO前体浓度为5μM时能够明显改善保存14d内的库血红细胞变形性指数和3d-7d内的刚性指数;NO前体浓度为10μM时,能明显改善保存3d-21d内红细胞变形性指数,14d-21d内的刚性指数;不同浓度的NO对红细胞聚集性指数均没有影响。高于相应的最佳NO浓度范围的时,红细胞变形指数受损。 结论:悬浮红细胞随着保存时间的延长,红细胞变形能力会逐渐降低。NO对库血红细胞变形功能具有调控作用,,通过补充最佳浓度的NO(如5μM)时,会使红细胞变形性增加;储存期间红细胞的损伤与NO流失有关,适当补充L-精氨酸(NO前体)可以恢复红细胞的变形性。
[Abstract]:Nitric oxide (no), as a highly reactive free radical, has a wide range of physiological functions in vivo. No forms SNO-HbN by binding to the conserved Hb93Cys residue in erythrocyte hemoglobin (Hb). However, no in HB molecule can transfer from heme to thiol group, regulate the storage and release of no, and mediate vasodilation. With the prolongation of storage time, the red blood cells will lose a lot of no, and the physiological activities such as vasodilation, deformability and oxygen-carrying capacity of hemoglobin will decrease after being injected into the body. Therefore, it is of great theoretical significance and clinical value to understand the loss of no in the course of erythrocyte storage and to understand the mechanism of no in circulatory system in order to ensure the safety and effectiveness of erythrocyte transfusion. The aim of this study was to improve the morphology and function of suspended red blood cells by supplementing no in vitro, and to explore the mechanism of no on the morphology and storage damage of red blood cells, so as to provide a theoretical basis for the effective preservation of red blood cells. Objective: to add different concentrations of no reagent: L-Arginine / L arginine / no precursor to suspended red blood cells during preservation, and to analyze the changes of no content and erythrocyte deformability in different phases of suspension erythrocyte preservation. The aim of this study was to investigate the effect of no on the deformability of erythrocytes and evaluate the storage quality of erythrocytes. Methods: 10 cases of fresh suspended red blood cells were stored at 4 鈩

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