病,V型)的病人应用核糖后最大容量从60 W提高到100 W,锻炼后的抽搐几乎完全消失[9]。 最近用猪实验还发现,用核糖后可改善冠心病心肌缺血区的检出。核糖可以促进210铊的再分布。1或4 h检测铊的再分布,都可发现使用核糖组能检测出比用生理盐水组大几乎2倍的可逆铊缺陷区[10]。可见核糖能够改善存活的心肌缺血区的检出。 5 核糖与药物或核苷酸前体联合应用 核糖的最大优点是它通过影响代谢而起作用,又是天然物质。当人们关心心脏和循环系统的功能时可考虑使用核糖。核糖与其他治疗心血管疾病的药物联合用药,如钙通道阻滞剂维拉帕米(Verapamil),β-受体阻滞剂莫普洛尔(Motoprolol),不会相互干扰[11,12]。所以核糖也是治疗心血管疾病时的重要辅助药物。 有研究发现,核糖与腺苷合用可达到最大保护心脏的功能。在大鼠用异丙肾上腺素来降低心脏的ATP代谢库的水平,连续静脉注射核糖5 h,不能完全对抗异丙肾上腺素的影响。但如果核糖与腺苷合用,则ATP水平可以完全恢复到正常。这个结果表明,单独增加腺苷酸生物合成(使用核糖)或单独增加补救途径(使用腺苷或肌苷)都不能在5 h内恢复异丙肾上腺素引起的ATP水平降低。只有当核糖使PRPP代谢库升高之后(约12 h),ATP才能恢复到原有水平[13]。所以在临床使用核糖时,应该考虑其发挥作用较慢这个因素。 联合使用核糖和腺苷还对肝、肾功能有好处。小鼠肝脏灌流模型经一段时间的耗竭性缺血之后重新灌流,用核糖灌流肝脏,ATP水平的恢复比对照组快许多,在重新灌流1 min后就恢复正常[14]。狗的肾脏切片如用含核糖和腺苷的营养液冷藏5 d,其ATP水平和总腺苷酸含量要比对照组高,其含水量也保持正常水平[15]。 鉴于D-核糖在保护心脏功能方面的独特作用,国外已开发成保健品,其应用前景诱人。 参考文献 1,De Wulf P,Vandamme EJ. Production of D-ribose by fermentation.Appl Micro Biotechnol,1997,48∶141~148 2,邱蔚然,高淑红.发酵法生产D-核糖.工业微生物,2000,30(1)∶58~64 3,Zimmer H-G.The oxidative pentose phosphate pathway in the heart:regulation,physiological significance,and clinical implications.Basic Res Cardiol,1992,87∶303~316 4,Zimmer H-G,Ibel H,Suchner U,et al. Ribose intervention in the cardiac pentose phosphate pathway is not species specific.Science,1984,223∶712~714 5,Reimer KA,Hill ML,Jennings RB.Prolonged depletion of ATP and of the adenine nucleotide pool due to delayed resynthesis of adenine nucleotides following reversible myocardial ischemic injury in dogs.J Mol Cell Cardiol,1981,13∶229~239 6,Zimmer H-G.Normalization of depressed heart function in rats by ribose.Science,1983,220∶81~82 7,Zimmer H-G,Martius PA,Maschner G.Myocardial infarction in rats:effects of metabolic and pharmacologic interventions.Basic Res Cardiol,1989,84∶332~343 8,Patten BM.Beneficial effect of D-ribose in patient with myoadenylare deaminase deficiency.Lancet,1982,1∶1071 9,Wagner DR,Zollner N.McArdle’s disease:Successful symptomatic therapy by high dose oral administration of ribose.Klin Wschr,1991,62∶92 10,Perlmutter NS,Wilson RA,Angello DA,et al. Ribose facilitates thallium-201 redistribution in patients with coronary artery disease.J Nucl Med,1991,32∶193~200 11,Mauser M,Hoffmeister HM,Nienaber C,et al.Influence of ribose,adenosine,and “AICAR” on the rate of myocardial adenosine tripnosphate synthesis during reperfusion after coronary artery occlusion in the dog.Circ Res,1985.56∶220~230 12,Zimmer H-G,Zierhut W,Marschner G.Combination of ribose with calcium antagonist and β-blocker treatment in closed-chest rats.J Mol Cell Cardiol,1987,19∶635~639 13,Zimmer H-G,Schneider A.Nucleotide precursors modify the effects of isoproterenol.Studies on heart function and cardiac adenine nucleotide content in intact rats.Cire Res,1991,69∶1575~1582 14,Lee RGL,Springer C,Kasulis P,et al. Nuclear magnetic resonance assessment of adenosine triphosphate(ATP) dynamics in ischemic mouse livers perfused with adenine and ribose.Invest Radiol,1987,22∶685~687 15,McAnulty JF,Southard JH,Belzer FO.Improved maintenance of adenosine triphosphate in five-day perfused kidneys with adenine and ribose.Transplant Proc,1987,19∶1376~1379 上一页 [1] [2]
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