土壤细菌化合物可能成为新的强效抗结核药物

2017-03-06 张荣杰 中华医学网

结核病是一种全球性的传染性疾病,目前结核分枝杆菌对于治疗的药物越来越有抵抗力。研究人员在土壤细菌中发现了一种化合物,这种化合物可能可以成为针对结核病的强效药物。土壤细菌中所生产的天然化合物已被证实可以杀死实验室中的结核分枝杆菌。

结核病是一种全球性的传染性疾病,目前结核分枝杆菌对于治疗的药物越来越有抵抗力。研究人员在土壤细菌中发现了一种化合物,这种化合物可能可以成为针对结核病的强效药物。土壤细菌中所生产的天然化合物已被证实可以杀死实验室中的结核分枝杆菌。

这项发现发表在自然通讯杂志(Nature Communications)上的研究是由澳大利亚悉尼大学(University of Sydney in Australia)领导的一个国际研究小组所完成的,研究小组中包括了来自英国、美国和加拿大的研究人员。

结核病(Tuberculosis,TB)是由结核分枝杆菌引起的一种疾病。虽然它可以影响身体的任何器官,但最常见于肺部。大多数情况下结核病是可以治疗和治愈的,但是如果结核病患者没有得到有效的治疗,则可能会导致患者的死亡。

根据世界卫生组织(WHO)的数据,结核病是全球十大死亡原因之一,全球约有1040万人患结核病,其中180万人死于结核病。超过95%的结核病相关死亡发生在低收入和中等收入国家。

在全球抗击结核病方面取得了巨大的进步。世界卫生组织报告说, 2000到2015年间对结核病有效的诊断和治疗挽救了4900万条生命。

耐药结核病的威胁

然而,结核病的威胁却是越来越大,因为结核分枝杆菌对目前可用的治疗药物越来越耐药,其中许多药物已经使用超过40年。

耐药结核病有两种形式:耐多药耐药结核病(multidrug-resistant Tuberculosis,MDR-TB),以及更罕见的广泛耐药结核病(extensively drug-resistant Tuberculosis,XDR-TB)。

耐多药结核至少对于异烟肼和利福平这两个用于一线治疗结核的药物耐药。广泛耐药结核是指对于异烟肼和利福平以及任何氟喹诺酮类药物和至少一种二线药物耐药,使患者的抗结核治疗没有更多的选择。

在美国,对于普通结核病治疗所使用的药物的费用约为18000美元,而对于耐药结核治疗则约494000美元。考虑到患者在进行治疗时对其收入的影响,治疗结核病的经济成本则更高。

该研究关注了一种由土壤细菌所产生的名为sansanmycin的尿苷肽类化合物,这类化合物可以使其他细菌无法再土壤细菌周围生存。

该化合物可以阻止结核分枝杆菌的细胞壁合成

该研究小组使用了化学合成的方法对于这种天然化合物或者类似物进行了一个更有效的结构变化。

通过实验室的实验表明,Sansanmycin天然产物的类似物可以对造成结核病的结核分枝杆菌造成有效的杀伤。

该化合物的靶标为一种叫MTB磷酸N-乙酰胞壁酸五肽酶(Mtb phospho-MurNAc-pentapeptide translocase)或称为MraY的酶,这种酶在结核分枝杆菌构建其细胞壁中起着关键的作用。

攻击结核分枝杆菌的这个“阿喀琉斯之踵”能够阻止它合成细胞壁。


悉尼大学化学教授,本研究领导者之一的Richard Payne教授说,这种天然化合物的类似物可以有效的杀灭位于巨噬细胞内的结核分枝杆菌,当结核分枝杆菌侵犯肺部时其常位于巨噬细胞内部。

Richard Payne教授说他们的发现为开发新的结核病药物提供了一个切入点,对于这个化合物使用的安全性的研究已经列入了下一步的计划中。

作者指出,下一步的工作还将针对于这种化合物选择靶标的潜在机制进行研究。

Richard Payne教授说,结核分枝杆菌如果没有了细胞壁则会死亡,还没有其他的药物可以靶向这种构成细胞壁的关键蛋白。

原始出处:
Anh T. Tran, Emma E. Watson, Venugopal Pujari, et al.Sansanmycin natural product analogues as potent and selective anti-mycobacterials that inhibit lipid I biosynthesis.Nature Communications.01 March 2017.

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    2017-03-08 wgx309
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    2017-03-07 stupidox

    这个非常有价值

    0