清晨好,您是今天最早来到科研通的研友!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您科研之路漫漫前行!

Toward Novel [18F]Fluorine-Labeled Radiotracers for the Imaging of α-Synuclein Fibrils

化学 生物信息学 共核细胞病 Pet成像 结合选择性 结合亲和力 立体化学 生物物理学 α-突触核蛋白 正电子发射断层摄影术 生物化学 受体 神经科学 心理学 病理 基因 疾病 帕金森病 生物 医学
作者
Bright C. Uzuegbunam,Junhao Li,Wojciech Paslawski,Wolfgang Weber,Per Svenningsson,Hans Ågren,Behrooz Hooshyar Yousefi
出处
期刊:Frontiers in Aging Neuroscience [Frontiers Media]
卷期号:14
标识
DOI:10.3389/fnagi.2022.830704
摘要

The accumulation of α-synuclein aggregates (α-syn) in the human brain is an occurrence common to all α-synucleinopathies. Non-invasive detection of these aggregates in a living brain with a target-specific radiotracer is not yet possible. We have recently discovered that the inclusion of a methylenedioxy group in the structure of diarylbisthiazole (DABTA)-based tracers improves binding affinity and selectivity to α-syn. Subsequently, complementary in silico modeling and machine learning (ML) of tracer–protein interactions were employed to predict surface sites and structure–property relations for the binding of the ligands. Based on this observation, we developed a small focused library of DABTAs from which 4-(benzo[d][1,3]dioxol-5-yl)-4′-(3-[ 18 F]fluoro-4-methoxyphenyl)-2,2′-bithiazole [ 18 F]d 2 , 6-(4′-(3-[ 18 F]fluoro-4-methoxyphenyl)-[2,2′-bithiazol]-4-yl)-[1,3]dioxolo[4,5-b]pyridine [ 18 F]d 4 , 4-(benzo [ d ][1,3]dioxol-5-yl)-4′-(6-[ 18 F]fluoropyridin-3-yl)-2,2′-bithiazole [ 18 F]d 6 , and 6-(4′-(6-[ 18 F]fluoropyridin-3-yl)-[2,2′-bithiazol]-4-yl)-[1,3]dioxolo[4,5- b ]pyridine [ 18 F]d 8 were selected based on their high binding affinity to α-syn and were further evaluated. Binding assay experiments carried out with the non-radioactive versions of the above tracers d 2 , d 4 , d 6 , and d 8 showed high binding affinity of the ligands to α-syn: 1.22, 0.66, 1.21, and 0.10 nM, respectively, as well as excellent selectivity over β-amyloid plaques (Aβ) and microtubular tau aggregates (>200-fold selectivity). To obtain the tracers, their precursors were radiolabeled either via an innovative ruthenium-mediated (S N Ar) reaction ( [ 18 F]d 2 and [ 18 F]d 4 ) or typical S N Ar reaction ( [ 18 F]d 6 and [ 18 F]d 8 ) with moderate-to-high radiochemical yields (13% – 40%), and high molar activity > 60 GBq/μmol. Biodistribution experiments carried out with the tracers in healthy mice revealed that [ 18 F]d 2 and [ 18 F]d 4 showed suboptimal brain pharmacokinetics: 1.58 and 4.63 %ID/g at 5 min post-injection (p.i.), and 1.93 and 3.86 %ID/g at 60 min p.i., respectively. However, [ 18 F]d 6 and [ 18 F]d 8 showed improved brain pharmacokinetics: 5.79 and 5.13 %ID/g at 5 min p.i.; 1.75 and 1.07 %ID/g at 60 min p.i.; and 1.04 and 0.58 %ID/g at 120 min p.i., respectively. The brain uptake kinetics of [ 18 F]d 6 and [ 18 F]d 8 were confirmed in a dynamic PET study. Both tracers also showed no brain radiometabolites at 20 min p.i. in initial in vivo stability experiments carried out in healthy mice. [ 18 F]d 8 seems very promising based on its binding properties and in vivo stability, thus encouraging further validation of its usefulness as a radiotracer for the in vivo visualization of α-syn in preclinical and clinical settings. Additionally, in silico and ML-predicted values correlated with the experimental binding affinity of the ligands.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
40秒前
紫熊发布了新的文献求助10
1分钟前
张同学快去做实验呀完成签到,获得积分10
1分钟前
1分钟前
紫熊发布了新的文献求助10
1分钟前
量子星尘发布了新的文献求助10
1分钟前
Dreamhappy完成签到,获得积分10
2分钟前
George完成签到,获得积分10
2分钟前
量子星尘发布了新的文献求助10
3分钟前
老石完成签到 ,获得积分10
3分钟前
3分钟前
宇文非笑完成签到 ,获得积分10
3分钟前
3分钟前
着急的松发布了新的文献求助10
3分钟前
着急的松完成签到,获得积分10
4分钟前
4分钟前
玛卡巴卡爱吃饭完成签到 ,获得积分10
4分钟前
量子星尘发布了新的文献求助10
4分钟前
深情安青应助科研通管家采纳,获得10
5分钟前
5分钟前
5分钟前
5分钟前
beastieboy完成签到,获得积分20
5分钟前
量子星尘发布了新的文献求助10
6分钟前
6分钟前
cym发布了新的文献求助10
6分钟前
彭于晏应助Xuancheng_SINH采纳,获得10
6分钟前
li给li的求助进行了留言
6分钟前
6分钟前
cym关注了科研通微信公众号
6分钟前
Xuancheng_SINH完成签到,获得积分20
6分钟前
努力努力再努力完成签到,获得积分10
7分钟前
柚子完成签到 ,获得积分10
7分钟前
量子星尘发布了新的文献求助10
7分钟前
CherylZhao完成签到,获得积分10
7分钟前
迷茫的一代完成签到,获得积分10
7分钟前
7分钟前
充电宝应助科研通管家采纳,获得10
7分钟前
LaFee完成签到,获得积分10
7分钟前
量子星尘发布了新的文献求助10
8分钟前
高分求助中
【提示信息,请勿应助】关于scihub 10000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Social Research Methods (4th Edition) by Maggie Walter (2019) 2390
A new approach to the extrapolation of accelerated life test data 1000
北师大毕业论文 基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 390
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
Robot-supported joining of reinforcement textiles with one-sided sewing heads 360
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4008393
求助须知:如何正确求助?哪些是违规求助? 3548117
关于积分的说明 11298711
捐赠科研通 3282900
什么是DOI,文献DOI怎么找? 1810258
邀请新用户注册赠送积分活动 885975
科研通“疑难数据库(出版商)”最低求助积分说明 811209