开发新型F-标记的选择性Orexin-2受体Radioligands用于 pozitron发射断层扫描
Jian Rong1, Chunyu Zhao1, Ahmad F Chaudhary1
1Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States.
ACS pharmacology & translational science
|November 20, 2025
概括
研究人员开发了新的PET配体[18F]1和[18F]2,用于成像素-2受体 (OX2R). 虽然显示出高亲和力和选择性,但脑吸收受限于流出输送器,因此需要进一步优化中枢神经系统成像应用.
科学领域:
- 神经科学是一个神经科学.
- 放射化学 放射化学是指辐射化学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 素-2受体 (OX2R) 对于调节睡眠-清醒周期,动机和养行为至关重要.
- OX2R调制显示了中枢神经系统障碍的治疗潜力,如麻醉症和失眠症.
- 药物开发需要非侵入性OX2R成像,但缺乏合适的PET放射性连接体.
研究的目的:
- 设计和评估新型正子发射断层扫描 (PET) 连接体候选人用于成像OX2R.
- 评估新型PET配体的结合亲和力,选择性和脑透率.
主要方法:
- 合成和放射性标记两种新型PET配体候选物,即[18F]1 ([18F]-OX2-2303) 和[18F]2 ([18F]-OX2-2304).
- 试验室评估包括结合亲和力和选择性测定,以及老鼠大脑部分的自发放射.
- 在老鼠体内进行PET成像,以评估大脑吸收,排泄输送效应以及使用OX2R抗剂的阻断研究.
主要成果:
- [18F]1和[18F]2都表现出高的OX2R结合亲和力 (Ki = 0.1和1nM) 以及对OX1R (>600倍) 的优秀选择性.
- 实验室自发放射学证实了在老鼠大脑中的选择性OX2R结合.
- 在体内PET成像显示出低基线脑吸收,归因于P-gp/BCRP流量;抑制这些载体增强了脑透.
结论:
- [18F]1和[18F]2是开发OX2R PET放射性连接体的有希望的起点.
- 进一步优化药物化学是必要的,以克服输送器介导的流量,并改善大脑透,以有效的中枢神经系统成像.
相关概念视频
Positron Emission Tomography
6.9K
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
6.9K
Imaging Studies II: Positron Emission Tomography and Scintigraphy
475
Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
Fundamental Principles of PET
475
![Automated Radiochemical Synthesis of [18F]3F4AP: A Novel PET Tracer for Imaging Demyelinating Diseases](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55537.jpg&w=3840&q=50)
![Microwave-assisted One-pot Synthesis of N-succinimidyl-4-[18F]fluorobenzoate [18F]SFB](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F2755.jpg&w=3840&q=50)
