Eur J Nucl Med Mol Imaging :一种新型高灵敏度阿尔茨海默病β-淀粉样蛋白PET示踪剂:[18F]DRKXH1

2021-07-29 MedSci原创 MedSci原创

[18F]DRKXH1是一种临床前灵敏度高的Aβ示踪剂

β-淀粉样蛋白(Aβ)在脑内的沉积是阿尔茨海默病(AD)的生物标志物。高灵敏度的Aβ正电子发射断层显像(PET)在AD的诊断和疗效评价中起着重要作用。

MiaoMiao Xu等合成了一种新型Aβ示踪剂[18F]DRKXH1(5-(4-(6-(2-[18]氟乙氧基)乙氧基)咪唑[1,2-α]吡啶-2-基)苯基),并通过生物分布分析、小动物PET-CT动态扫描、离体和体外放射自显影以及人体PET评价其示踪性能。

该研究利用GE FN模块自动合成[18F]DRKXH1,对[18F]DRKXH1的Log D(pH7.4)和生物分布进行了研究。用小动物PET对AD转基因小鼠(APPSWE/PSEN1DE9)和年龄匹配的正常小鼠进行[18F]DRKXH1和[18F]AV45显像研究。以小脑为参考区,计算其分布体积比(DVR)和标准化摄取值比(SUVRs)。采用离体放射自显影和免疫组化方法测定AD转基因小鼠脑内Aβ斑块的沉积情况。对AD患者和健康对照组的死后脑切片进行体外放射自显影。用[18F]DRKXH1对2例健康对照者和1例AD患者进行活体PET研究。

[18F]DRKXH1的产率为40%,比活性为156.64±11.55GBq/μmol。[18F]DRKXH1主要通过肝、肾排泄。

不同时间点[18F]DRKXH1在WT小鼠体内的生物分布。值表示为%ID/g组织(均值±SD,n=5)

小动物PET研究显示,[18F]DRKXH1的初始脑摄取量高,清除速度快。检测转AD基因小鼠大脑皮层和海马中[18F]DRKXH1的浓度。AD转基因小鼠皮层DVR高于WT小鼠(P<0.0001)。另外,0-60min动态扫描显示AD转基因小鼠的SUVRs明显高于WT小鼠。

活体内0-60分钟[18F]DRKXH1PET成像

体外放射自显影显示AD转基因小鼠脑内富含Aβ斑块的区域有显着浓度的示踪剂。[18F]DRKXH1的DVR值高于[18F]-AV45(1.29±0.05vs1.05±0.08,t=5.33,P=0.0003)。

用[18F]-DRKXH1标记的人脑切片的体外放射自显影。A健康对照受试者。B AD病人。C采用[18F]DRKXH1 + 10 μM [19F]DRKXH1对AD患者进行体外放射自显影

人死后脑组织放射自显影显示AD脑内有[18F]DRKXH1标记的Aβ斑块。

AD患者和健康对照组的[18F]-DRKXH1 PET图像

这项研究纳入了1名AD患者(男性,82岁,MMSE:17)和2名健康对照组(男性,42岁和50岁)。在AD患者中,观察到明显的[18F]DRKXH1滞留在识别的淀粉样蛋白沉积区,如顶叶和额叶皮层。但在健康对照受试者中未观察到这一现象。在两组中,观察到皮层下白质的低保留和小脑皮层、桥脑和丘脑的高摄取

该研究团队合成了一个新的Aβ示踪剂[18F]DRKXH1。[18F]DRKXH1是一种临床前灵敏度高的Aβ示踪剂。在临床前研究中,它在体内和体外水平上都表现出很高的结合亲和力,有可能用于人脑的活体检。PET在人体中的研究显示了其在临床诊断中的潜力,但仍需进一步研究。

原文出处

Xu, M., Guo, J., Gu, J. et al. Preclinical and clinical study on [18F]DRKXH1: a novel β-amyloid PET tracer for Alzheimer’s disease. Eur J Nucl Med Mol Imaging (2021). https://doi.org/10.1007/s00259-021-05421-0

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topicName=淀粉样蛋白)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=c1774999170, createdName=ms7405317358118777, createdTime=Sat Jul 31 14:07:38 CST 2021, time=2021-07-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1470489, encodeId=7c0614e0489d5, 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=28, 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=Sat Jul 31 14:07:38 CST 2021, time=2021-07-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1611182, encodeId=b85216111828c, content=<a href='/topic/show?id=eb6b1145939' target=_blank style='color:#2F92EE;'>#Med#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11459, encryptionId=eb6b1145939, topicName=Med)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=552a19396740, createdName=ms3994565386320060, createdTime=Sat Jul 31 14:07:38 CST 2021, time=2021-07-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1003742, encodeId=a57e1003e42b7, content=淀粉样蛋白(Aβ)在脑内的沉积是阿尔茨海默病(AD)的生物标志物。, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=bd984965877, createdName=1453df99m58暂无昵称, createdTime=Thu Jul 29 23:22:20 CST 2021, time=2021-07-29, status=1, ipAttribution=)]
    2022-06-27 feather89
  4. 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level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11459, encryptionId=eb6b1145939, topicName=Med)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=552a19396740, createdName=ms3994565386320060, createdTime=Sat Jul 31 14:07:38 CST 2021, time=2021-07-31, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1003742, encodeId=a57e1003e42b7, content=淀粉样蛋白(Aβ)在脑内的沉积是阿尔茨海默病(AD)的生物标志物。, beContent=null, objectType=article, channel=null, level=null, likeNumber=70, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=bd984965877, createdName=1453df99m58暂无昵称, createdTime=Thu Jul 29 23:22:20 CST 2021, time=2021-07-29, status=1, ipAttribution=)]
  5. 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  6. 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  7. [GetPortalCommentsPageByObjectIdResponse(id=1818135, encodeId=99521818135cf, 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=43, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=97777, encryptionId=4c9f9e777ac, topicName=阿尔茨海)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=4c37265, createdName=zhaojie88, createdTime=Fri Jun 17 08:07:38 CST 2022, time=2022-06-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1775944, encodeId=10cd1e75944cf, content=<a href='/topic/show?id=ede06694367' target=_blank style='color:#2F92EE;'>#灵敏度#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=60, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=66943, encryptionId=ede06694367, topicName=灵敏度)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a12645, 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  8. 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  9. 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    2021-07-29 1453df99m58暂无昵称

    淀粉样蛋白(Aβ)在脑内的沉积是阿尔茨海默病(AD)的生物标志物。

    0

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