Neurology:淀粉样蛋白PET预测散发性阿尔茨海默病症状的发生

2021-09-22 Naomii MedSci原创

研究人员用匹兹堡化合物B进行淀粉样蛋白PET测定脑淀粉样蛋白负荷,以预测认知正常的脑淀粉样变性患者出现AD的时间,散发性阿尔茨海默病的症状出现年龄与个体达到淀粉样蛋白积聚临界点的年龄密切相关。

    

     淀粉样斑块和神经原纤维缠结是阿尔茨海默病(AD)特征性的神经病理改变,这被认为在痴呆症状出现约20年前即开始积累。大脑淀粉样蛋白的积累并非随时间线性发生——研究表明,在淀粉样蛋白负荷的极低水平下,淀粉样蛋白积累的速度缓慢且高度可变。当超过其负荷阈值,积累的速度就会增加,并在不同个体间趋于一致,因此可以通过各种模型预测可靠地估计淀粉样蛋白积累时间。

     近日,有研究人员参考核依赖的聚集以模拟淀粉样蛋白聚集,推测标志着淀粉样蛋白从缓慢堆积向快速堆积转变的淀粉样蛋白负荷水平可能代表大脑淀粉样蛋白聚集的成核阈值,并假设淀粉样蛋白聚集这一阈值是影响个人临床数据的关键转折点,以预测认知正常的脑淀粉样变性患者何时会出现AD症状。

     本研究为一前瞻性的队列研究,共计236名患者在匹兹堡化合物B的标记下完成了淀粉样蛋白PET。其中淀粉样蛋白积累的临界点被确定为低水平的淀粉样蛋白负荷(SUVR 1.2),到达该负荷水平的平均时间被用来估计一个人达到SUVR 1.2的年龄。此后几乎所有个体都以相对一致的速率积累淀粉样蛋白,直到达到高水平的淀粉样蛋白负荷(SUVR 3.0)。

  • 180名患者的纵向临床诊断遵循达到负荷水平SUVR1.2的预测年龄。
  • 在从认知正常发展到典型AD的22名个体中,估计达到SUVR1.2的年龄预测了症状开始的年龄(R2=0.54p<0.0001,均方根误差(RMSE)为4.5年);在排除3例可能的误诊后,该模型更准确(R2=0.84p<0.0001,RMSE为2.8年)。

结论:散发性阿尔茨海默病的症状出现年龄与个体达到淀粉样蛋白积聚临界点的年龄密切相关。

文献来源:https://n.neurology.org/content/early/2021/09/09/WNL.0000000000012775.long

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    2022-06-20 zxxiang
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    2021-11-26 yinhl1978
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  4. [GetPortalCommentsPageByObjectIdResponse(id=2043032, encodeId=f3a72043032de, content=<a href='/topic/show?id=88535e63128' target=_blank style='color:#2F92EE;'>#散发性#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=57631, encryptionId=88535e63128, topicName=散发性)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=2f5a410, createdName=zxxiang, createdTime=Mon Jun 20 01:15:30 CST 2022, time=2022-06-20, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2001484, encodeId=766020014846c, content=<a href='/topic/show?id=d5df12695e6' target=_blank style='color:#2F92EE;'>#Neurol#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=12695, encryptionId=d5df12695e6, topicName=Neurol)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=8217292, createdName=yinhl1978, createdTime=Fri Nov 26 03:15:30 CST 2021, time=2021-11-26, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1818140, encodeId=adff181814032, content=<a href='/topic/show?id=4c9f9e777ac' target=_blank style='color:#2F92EE;'>#阿尔茨海#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=97777, encryptionId=4c9f9e777ac, topicName=阿尔茨海)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=636e2500187, createdName=12498da4m32(暂无昵称), createdTime=Sat Feb 05 16:15:30 CST 2022, time=2022-02-05, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1729123, encodeId=ee251e29123fb, content=<a href='/topic/show?id=986913980dd' target=_blank style='color:#2F92EE;'>#PE#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=45, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=13980, encryptionId=986913980dd, topicName=PE)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f06c33759375, createdName=feather89, createdTime=Wed May 04 17:15:30 CST 2022, time=2022-05-04, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1817117, encodeId=cb2c181e117cd, content=<a href='/topic/show?id=17b59e77626' target=_blank style='color:#2F92EE;'>#阿尔茨#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=35, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=97776, encryptionId=17b59e77626, topicName=阿尔茨)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdwx.qlogo.cn/mmopen/vi_32/Bnia2EtH2IvyBtniaWHPQOYAicsN3IAL1ZuPV7qyALcdCiawRJdEiafMxWTxzERQW7eeKg8HfCKCRK2CJicy073C4RJg/132, createdBy=464b2500186, createdName=ms1948154235210413, createdTime=Tue May 17 01:15:30 CST 2022, time=2022-05-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1331194, encodeId=15ba1331194d9, content=<a href='/topic/show?id=15e2140e438' target=_blank style='color:#2F92EE;'>#PET#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14074, encryptionId=15e2140e438, topicName=PET)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdwx.qlogo.cn/mmopen/vi_32/Q0j4TwGTfTI5PdY90y5Jib8FnPhCXTR2d9v3K17epNSwB2eb0vmXUldNJl2e72S4unZTAHLAojicdVSialTDFHAxA/132, createdBy=78d82500042, createdName=ms7514935887898259, createdTime=Fri Sep 24 14:15:30 CST 2021, time=2021-09-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1442892, encodeId=ce9f144289230, 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=Fri Sep 24 14:15:30 CST 2021, time=2021-09-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1470494, encodeId=058114e049409, content=<a href='/topic/show?id=45a79e7788c' target=_blank style='color:#2F92EE;'>#阿尔茨海默#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=26, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=97778, encryptionId=45a79e7788c, topicName=阿尔茨海默)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c5917090900, createdName=yhj-time, createdTime=Fri Sep 24 14:15:30 CST 2021, time=2021-09-24, status=1, ipAttribution=)]
    2022-05-04 feather89
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一部分星形胶质细胞试图通过释放一种叫做白细胞介素 3 (IL-3) 的分子将杀伤性小胶质细胞转化为不再消灭神经元而是专注于清除淀粉样蛋白 β 沉积物和tau 缠结。

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​失智症又名认知障碍症、认知症、痴呆症,包括常见的老年痴呆即阿尔茨海默病,这是一种高致残率、高死亡率的神经退行性疾病,随着病情发展,患者失忆、失智、失能,且伴有精神行为异常,病情可能持续8-20年

拓展阅读

Nature:全新阿尔茨海默症治疗方法:多感官伽马刺激促进淋巴系统清除淀粉样蛋白

研究表明,40赫兹伽马频率的刺激能够促进脑内神经节奏的协调,从而改善淋巴脑脊液系统的功能,加速脑内废物,特别是Aβ的清除。

宁波市医疗中心李惠利医院黄凤娟和廉姜芳等人JCIM论文:动脉粥样硬化相关淀粉样蛋白Medin异常聚集的分子机制

作者通过氨基酸相互作用网络接触图分析,发现medin的30-41和42-50号氨基酸片段形成的β-hairpin是稳定medin单体构象的核心,该结构的形成驱动了medin单体的动力学折叠。

超30种心脏淀粉样变分型,这两种占比超98%!

虽然已经超过30种蛋白质能够在体内聚集为淀粉样蛋白,但只有9种淀粉样蛋白在心肌中蓄积,能引起显著的心脏疾病。

终结痴呆症?新疫苗减少淀粉样蛋白,减少大脑炎症,改善行为和意识

该研究显示,一种新型疫苗,或是终结痴呆症的开始。小鼠模型发现,接种新疫苗后,可以清除大脑中淀粉样蛋白斑块,减少大脑炎症,行为和意识也有所改善。该疫苗可能是预防或改变疾病进程的关键。

Neurology:认知正常的淀粉样蛋白阳性老年人睡眠呼吸障碍与内侧颞叶萎缩的关系

近日,一项发表在Neurology上的研究发现,睡眠呼吸障碍(SDB)与认知无症状的老年阿尔茨海默病患者的MTL萎缩有关,这可能会随着时间的推移增加发展记忆障碍的风险。