STM:修复蛋白被激活帮助肌肉萎缩症患者生成肌肉细胞

2014-08-25 佚名 生物谷

当肌肉细胞膜遭到破坏,修复蛋白质dysferlin就会被激活并且重新帮助生成肌肉细胞膜。如果这种修复蛋白质由于基因突变被改变,那么人体自身的“质量控制”系统(即蛋白酶体)就认为该蛋白质是缺陷的继而消除它。如果没有dysferlin蛋白,那么受伤的肌肉细胞膜就不能被修复,从而导致骨骼肌细胞逐渐损失最终致使肌肉萎缩。看来,人体自身的“质量控制体系"会中和突变蛋白质dysferlin,即使这种突变

当肌肉细胞膜遭到破坏,修复蛋白质dysferlin就会被激活并且重新帮助生成肌肉细胞膜。如果这种修复蛋白质由于基因突变被改变,那么人体自身的“质量控制”系统(即蛋白酶体)就认为该蛋白质是缺陷的继而消除它。如果没有dysferlin蛋白,那么受伤的肌肉细胞膜就不能被修复,从而导致骨骼肌细胞逐渐损失最终致使肌肉萎缩。看来,人体自身的“质量控制体系"会中和突变蛋白质dysferlin,即使这种突变体并不会损害它的修复功能。

修复蛋白质重新被激活。Michael Sinnreich教授领导的研究小组曾证实,蛋白酶体抑制剂可以激活培养的肌肉细胞中发生突变的dysferlin蛋白质,这种肌肉细胞取自肌肉萎缩症患者体内。大量的蛋白酶体抑制剂使变异的修复蛋白能恢复其功能并且修复受损的肌肉细胞膜。该小组已经将调查结果转化为临床应用。在理论水平的研究中,该结论中蛋白酶体抑制剂修复肌肉萎缩症患者骨骼肌中失踪的dysferlin蛋白质。体内含有dysferlin突变体的三个病人获得了体内所需要剂量的蛋白酶体抑制剂。几天后,病人的肌肉组织中产生了失踪dysferlin蛋白质,该蛋白质可能在临床上有重要作用。

该项研究的研究主管Michael Sinnreich说:“新的发现为未来的长期临床试验奠定了基础,这些发现可能对治疗肌肉萎缩症以及其它以前无法治愈的遗传疾病非常重要。”

原始出处:

Azakir BA1, Erne B1, Di Fulvio S1, Stirnimann G2, Sinnreich M3.Proteasome inhibitors increase missense mutated dysferlin in patients with muscular dystrophy.Sci Transl Med. 2014 Aug 20;6(250):250ra112. doi: 10.1126/scitranslmed.3009612. Epub 2014 Aug 20.

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    2015-03-18 chendoc252
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    2015-05-23 gdsun
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