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Design, Synthesis, and Preclinical Evaluation of Inhibitor-Based Radiotracers for Potential Application in Monitoring
Yuan Pan1, Xiaoli Zhang1,2, Bo Zhou1
1Key Laboratory for Experimental Teratology of the Ministry of Education and Center for Experimental Nuclear Medicine, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China.
Researchers developed a new PET radiotracer, [68Ga]Ga-PY03, to visualize and quantify cyclin-dependent kinases 4 and 6 (CDK4/6) expression in tumors, aiding in cancer therapy assessment.
Area of Science:
- Oncology
- Radiochemistry
- Molecular Imaging
Background:
- Cyclin-dependent kinases 4 and 6 (CDK4/6) are crucial for cell cycle progression and are key therapeutic targets in cancer.
- Developing effective imaging agents for CDK4/6 is essential for monitoring treatment response.
Purpose of the Study:
- To design, synthesize, and evaluate novel Gallium-68 (68Ga) based radiotracers for CDK4/6.
- To identify a lead candidate with optimal properties for preclinical imaging and therapeutic monitoring.
Main Methods:
- Synthesis of eight novel 68Ga-labeled radiotracers based on the ribociclib pharmacophore.
- Evaluation of radiotracers' stability, binding affinity to CDK4/6, and pharmacokinetic properties.
- Preclinical validation using Micro-PET/CT imaging in tumor models.
Main Results:
- [68Ga]Ga-PY03 demonstrated superior stability, high CDK4/6 binding affinity, and low non-specific uptake compared to other candidates.
- Micro-PET/CT imaging confirmed [68Ga]Ga-PY03's ability to detect CDK4/6-overexpressing tumors.
- [68Ga]Ga-PY03 enabled dynamic monitoring of CDK4/6 expression and quantitative assessment of target occupancy.
Conclusions:
- [68Ga]Ga-PY03 is a promising PET radiotracer for visualizing and quantifying CDK4/6 expression in tumors.
- This tracer has the potential to guide CDK4/6-targeted cancer therapy and evaluate treatment efficacy.
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