Nature:有毒的“淀粉样蛋白”对健康肌肉组织的有益作用

2018-11-05 小通 生物通

发表在《Nature》杂志的这个令人惊讶的发现为许多不可治愈的疾病提供了新线索,例如肌肉萎缩性侧索硬化症(ALS)、包涵体肌病(虚弱和肌肉变性)以及某些形式的营养不良。

发表在《Nature》杂志的这个令人惊讶的发现为许多不可治愈的疾病提供了新线索,例如肌肉萎缩性侧索硬化症(ALS)、包涵体肌病(虚弱和肌肉变性)以及某些形式的营养不良。



“我们的研究首次表明,淀粉样结构不仅存在于健康骨骼肌再生过程中,而且可能对骨骼肌形成也很重要,”文章一作、科罗拉多大学分子、细胞和发育生物学系准博士生Thomas Vogler说。

发表在《Nature》杂志上的这个令人惊讶的发现为许多不可治愈的疾病提供了新线索,例如肌肉萎缩性侧索硬化症(ALS)、包涵体肌病(虚弱和肌肉变性)以及某些形式的营养不良。

“许多退行性疾病都有很多相似的情况,细胞中开始积累蛋白质聚集体,并黏连起来,”文章共同一作生化系准博士Joshua Wheeler说。“这些聚集体有益于正常再生,我们的数据表明,这一现象只不过是细胞受损后试图进行自我维护。”

他们与致力于生肌研究的Brad Olwin教授课题组合作,聚焦一种名为TDP-43的蛋白质。

长期以来,TDP-43一直被认为是疾病的罪魁祸首,广泛存在于包涵体肌病患者骨骼肌和ALS患者神经元中。但是,当研究人员仔细检查实验室培养肌肉组织时,他们发现,TDP-43不止存在于患者组织,健康人组织也有。

“我们明明认为是有毒的东西,”Olwin说。“结果却发现,它们似乎是肌肉形成的正常组成部分,只不过在某一时间出现,一旦肌肉形成,又会消失。”

随后,实验室培养肌肉组织研究表明,敲除编码TDP-43的基因,肌肉就不会生长。当研究人员从健康人身上采集正在再生的活体组织时,他们也发现了TDP-43聚集物(或称为“肌颗粒”)。进一步RNA-蛋白质图谱分析表明,这些成簇的分子很像在细胞中行驶的运输卡车,似乎携带着指导收缩肌肉纤维如何重建的说明。

Wheeler和Vogler都是健跑爱好者,而且是多年的老友。在一次跑步训练中,他们冒出了这项研究的初步设想。Wheeler说,健康的运动员通过马拉松和超级马拉松等运动来促使肌肉变得坚韧,他们体内也可能会形成淀粉样蛋白簇。

但是仍有一个关键问题待解决:为什么大多数人都能快速清除这些蛋白,而另一些人体内的颗粒块却会聚集在一起引发疾病?

“如果它们经常形成又消失,一定有什么东西会使其溶解,”Olwin说。“找出涉及的机制可能为治疗开辟新途径。”

接下来,他们还准备研究受伤后的大脑是否会发生类似过程,从而引发疾病,进而确定蛋白质簇的真正作用。

“所有的工作都围绕着治疗ALS这样具有破坏性后果的不治之症,并制定相应策略以改善骨骼肌和健康,”Wheeler说。“我们只不过是刚刚打开了这扇门。”

原始出处:Thomas O. Vogler, Joshua R. Wheeler, Eric D. Nguyen, et al. TDP-43 and RNA form amyloid-like myo-granules in regenerating muscle. Nature. 31 October 2018

版权声明:
本网站所有内容来源注明为“梅斯医学”或“MedSci原创”的文字、图片和音视频资料,版权均属于梅斯医学所有。非经授权,任何媒体、网站或个人不得转载,授权转载时须注明来源为“梅斯医学”。其它来源的文章系转载文章,或“梅斯号”自媒体发布的文章,仅系出于传递更多信息之目的,本站仅负责审核内容合规,其内容不代表本站立场,本站不负责内容的准确性和版权。如果存在侵权、或不希望被转载的媒体或个人可与我们联系,我们将立即进行删除处理。
在此留言
评论区 (5)
#插入话题
  1. [GetPortalCommentsPageByObjectIdResponse(id=1883406, encodeId=6d9f18834066e, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sat Jun 22 07:41:00 CST 2019, time=2019-06-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1997364, encodeId=0605199e36457, content=<a href='/topic/show?id=8a4b8101490' target=_blank style='color:#2F92EE;'>#肌肉组织#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81014, encryptionId=8a4b8101490, topicName=肌肉组织)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f98e185, createdName=psybestwish, createdTime=Tue Jun 25 11:41:00 CST 2019, time=2019-06-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=353338, encodeId=647d3533380d, content=向科研人员致敬!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=88, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e5171668917, createdName=坚强007, createdTime=Thu Nov 22 10:53:42 CST 2018, time=2018-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1442853, encodeId=271e1442853ae, content=<a href='/topic/show?id=e112659308a' target=_blank style='color:#2F92EE;'>#淀粉样蛋白#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65930, encryptionId=e112659308a, topicName=淀粉样蛋白)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1774999170, createdName=ms7405317358118777, createdTime=Wed Nov 07 13:41:00 CST 2018, time=2018-11-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=351697, encodeId=0a5335169e34, content=越来越多证据表明当前以Aβ为基础的AD研究大方向可能就是不对的, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=a07b1926496, createdName=bioseraph, createdTime=Tue Nov 06 08:27:30 CST 2018, time=2018-11-06, status=1, ipAttribution=)]
    2019-06-22 liye789132251
  2. [GetPortalCommentsPageByObjectIdResponse(id=1883406, encodeId=6d9f18834066e, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sat Jun 22 07:41:00 CST 2019, time=2019-06-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1997364, encodeId=0605199e36457, content=<a href='/topic/show?id=8a4b8101490' target=_blank style='color:#2F92EE;'>#肌肉组织#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81014, encryptionId=8a4b8101490, topicName=肌肉组织)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f98e185, createdName=psybestwish, createdTime=Tue Jun 25 11:41:00 CST 2019, time=2019-06-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=353338, encodeId=647d3533380d, content=向科研人员致敬!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=88, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e5171668917, createdName=坚强007, createdTime=Thu Nov 22 10:53:42 CST 2018, time=2018-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1442853, encodeId=271e1442853ae, content=<a href='/topic/show?id=e112659308a' target=_blank style='color:#2F92EE;'>#淀粉样蛋白#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65930, encryptionId=e112659308a, topicName=淀粉样蛋白)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1774999170, createdName=ms7405317358118777, createdTime=Wed Nov 07 13:41:00 CST 2018, time=2018-11-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=351697, encodeId=0a5335169e34, content=越来越多证据表明当前以Aβ为基础的AD研究大方向可能就是不对的, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=a07b1926496, createdName=bioseraph, createdTime=Tue Nov 06 08:27:30 CST 2018, time=2018-11-06, status=1, ipAttribution=)]
  3. [GetPortalCommentsPageByObjectIdResponse(id=1883406, encodeId=6d9f18834066e, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sat Jun 22 07:41:00 CST 2019, time=2019-06-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1997364, encodeId=0605199e36457, content=<a href='/topic/show?id=8a4b8101490' target=_blank style='color:#2F92EE;'>#肌肉组织#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81014, encryptionId=8a4b8101490, topicName=肌肉组织)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f98e185, createdName=psybestwish, createdTime=Tue Jun 25 11:41:00 CST 2019, time=2019-06-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=353338, encodeId=647d3533380d, content=向科研人员致敬!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=88, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e5171668917, createdName=坚强007, createdTime=Thu Nov 22 10:53:42 CST 2018, time=2018-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1442853, encodeId=271e1442853ae, content=<a href='/topic/show?id=e112659308a' target=_blank style='color:#2F92EE;'>#淀粉样蛋白#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65930, encryptionId=e112659308a, topicName=淀粉样蛋白)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1774999170, createdName=ms7405317358118777, createdTime=Wed Nov 07 13:41:00 CST 2018, time=2018-11-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=351697, encodeId=0a5335169e34, content=越来越多证据表明当前以Aβ为基础的AD研究大方向可能就是不对的, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=a07b1926496, createdName=bioseraph, createdTime=Tue Nov 06 08:27:30 CST 2018, time=2018-11-06, status=1, ipAttribution=)]
    2018-11-22 坚强007

    向科研人员致敬!!!

    0

  4. [GetPortalCommentsPageByObjectIdResponse(id=1883406, encodeId=6d9f18834066e, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sat Jun 22 07:41:00 CST 2019, time=2019-06-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1997364, encodeId=0605199e36457, content=<a href='/topic/show?id=8a4b8101490' target=_blank style='color:#2F92EE;'>#肌肉组织#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81014, encryptionId=8a4b8101490, topicName=肌肉组织)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f98e185, createdName=psybestwish, createdTime=Tue Jun 25 11:41:00 CST 2019, time=2019-06-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=353338, encodeId=647d3533380d, content=向科研人员致敬!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=88, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e5171668917, createdName=坚强007, createdTime=Thu Nov 22 10:53:42 CST 2018, time=2018-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1442853, encodeId=271e1442853ae, content=<a href='/topic/show?id=e112659308a' target=_blank style='color:#2F92EE;'>#淀粉样蛋白#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65930, encryptionId=e112659308a, topicName=淀粉样蛋白)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1774999170, createdName=ms7405317358118777, createdTime=Wed Nov 07 13:41:00 CST 2018, time=2018-11-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=351697, encodeId=0a5335169e34, content=越来越多证据表明当前以Aβ为基础的AD研究大方向可能就是不对的, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=a07b1926496, createdName=bioseraph, createdTime=Tue Nov 06 08:27:30 CST 2018, time=2018-11-06, status=1, ipAttribution=)]
  5. [GetPortalCommentsPageByObjectIdResponse(id=1883406, encodeId=6d9f18834066e, content=<a href='/topic/show?id=3b2112532d8' target=_blank style='color:#2F92EE;'>#Nat#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=28, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12532, encryptionId=3b2112532d8, topicName=Nat)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2e6f107, createdName=liye789132251, createdTime=Sat Jun 22 07:41:00 CST 2019, time=2019-06-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1997364, encodeId=0605199e36457, content=<a href='/topic/show?id=8a4b8101490' target=_blank style='color:#2F92EE;'>#肌肉组织#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=81014, encryptionId=8a4b8101490, topicName=肌肉组织)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=f98e185, createdName=psybestwish, createdTime=Tue Jun 25 11:41:00 CST 2019, time=2019-06-25, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=353338, encodeId=647d3533380d, content=向科研人员致敬!!!, beContent=null, objectType=article, channel=null, level=null, likeNumber=88, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=e5171668917, createdName=坚强007, createdTime=Thu Nov 22 10:53:42 CST 2018, time=2018-11-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1442853, encodeId=271e1442853ae, content=<a href='/topic/show?id=e112659308a' target=_blank style='color:#2F92EE;'>#淀粉样蛋白#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=29, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65930, encryptionId=e112659308a, topicName=淀粉样蛋白)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1774999170, createdName=ms7405317358118777, createdTime=Wed Nov 07 13:41:00 CST 2018, time=2018-11-07, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=351697, encodeId=0a5335169e34, content=越来越多证据表明当前以Aβ为基础的AD研究大方向可能就是不对的, beContent=null, objectType=article, channel=null, level=null, likeNumber=90, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=/v1.0.0/img/user_icon.png, createdBy=a07b1926496, createdName=bioseraph, createdTime=Tue Nov 06 08:27:30 CST 2018, time=2018-11-06, status=1, ipAttribution=)]
    2018-11-06 bioseraph

    越来越多证据表明当前以Aβ为基础的AD研究大方向可能就是不对的

    0

相关资讯

JAMA Neurol:大脑皮层tau蛋白和淀粉样蛋白沉积的分层组织研究

中老年脑tau和Aβ沉淀存在明确的层次的皮质关系以及病理改变关联区域间相互重叠,这一发现对系统性的早期AD病理机制研究极为重要

Hum Mol Genet:“绕开”淀粉样蛋白,科学家们正在寻找老年痴呆新病因

作为一种常见的神经性衰退疾病,阿尔兹海默症(AD)起病隐袭、多发于中老年群体。不少学者认为,β-淀粉样蛋白是AD一级预防的理想目标。现在,一篇新研究提出了不同的看法,来自于纽约州立大学布法罗分校的科学家们找到了另一种关键蛋白,有望在AD早期防治中发挥作用。

Elife:导致阿尔兹海默症的“元凶”能够降低精子活力

精液和阿尔兹海默症患者的大脑的相似之处在于:它们都含有一种名为淀粉样纤维的蛋白质微丝。尽管淀粉样沉积会对脑细胞造成损伤,这些蛋白微丝却可能在生殖过程起着至关重要的作用。一项新的研究表明,精液中的蛋白微丝可使状态低于平均水平的精子动弹不得,从而保证只有最好的精子得以到达卵细胞。

Am J Resp Crit Care:认知正常老年人的OSA严重程度会影响淀粉样蛋白负担!

在认知正常的老年人样本中,OSA与2年随访中淀粉样蛋白负荷增加有关。OSA的睡眠碎片和/或间歇性缺氧可能是潜在的机制。如果证实,OSA的临床干预可能有助于预防认知正常老年人脑脊液中淀粉样蛋白的积聚。

JAMA Neurol:原发性进行性失语患者淀粉样蛋白显像研究

根据现行的分类标准,原发性进行性失语症的诊断与阿尔茨海默生物标志物状态有关,额叶-颞叶变性病理具有高度的预测作用。阿尔茨海默生物标志物阳性可能代表着多种混合病理而非原发性阿尔茨海默病

Nature:老年痴呆防治的关键是什么?越早越好!

7月12日,来自于华盛顿大学医学院的科学家在Nature期刊发表评论文章“Stop Alzheimer’s before it starts”,强调“一级预防”阿尔兹海默症的重要性。文章认为,阿尔兹海默症的治疗时间应该“往前挪”,挪至大脑病理特征尚未出现的时候。