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Reviewing the mechanism of action of thiopurine drugs: Towards a new paradigm in clinical practice

机译:审查硫嘌呤药物的作用机理:迈向临床实践的新范式

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The precise mechanism of action of thiopurine drugs remains unclear despite more than 40 years of use. Recent knowledge in the field of apoptosis and a better insight into, as well as a rapid increase in their use in several important areas of clinical medicine justify this appraisal. This is a review of the recent advances in the knowledge of their mechanism of action and is primarily intended to help clinicians understand the pharmacological properties of these drugs adequately and to find ways to improve their use in clinical practice.The parent compound is azathioprine (AZA), which is rapidly reduced in the presence of glutathione to 6-mercaptopurine (6-MP) and then metabolized into active metabolites with immune-modifier activity. Recent observations and new data indicate that AZA/6-MP could be considered as a “two-in-one” drug, providing a source of 6-thioguanine nucleotides (6-TGNs) and methylated metabolites, and that both compounds could contribute to its antiproliferative effects. This review will also focus on mechanisms that may help to explain a number of recent observations showing that myelotoxicity may occur in patients with high TPMT level or low 6-TGN rate. Our final proposal suggests that the immunosuppressive effects of these drugs are due to a balanced combination of antimetabolic and pro-apoptotic actions.
机译:尽管已使用40多年,但硫嘌呤药物的确切作用机理仍不清楚。这项评估证明了细胞凋亡领域的最新知识以及对它们在临床医学几个重要领域中的使用的更深入了解以及其使用的迅速增加。这是对它们作用机理知识的最新进展的综述,其主要目的是帮助临床医生充分了解这些药物的药理特性,并找到改善其在临床实践中使用的方法。母体化合物硫唑嘌呤(AZA) ),在存在谷胱甘肽的情况下迅速还原为6-巯基嘌呤(6-MP),然后代谢为具有免疫修饰活性的活性代谢产物。最近的观察和新数据表明,AZA / 6-MP可以被认为是“二合一”药物,提供了6-硫鸟嘌呤核苷酸(6-TGNs)和甲基化代谢产物的来源,并且这两种化合物都可能有助于它的抗增殖作用。这篇综述还将侧重于可能有助于解释最近的一些观察结果的机制,这些结果表明,TPMT水平高或6-TGN率低的患者可能发生骨髓毒性。我们的最终建议表明,这些药物的免疫抑制作用是由于抗代谢和促凋亡作用的平衡组合所致。

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