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Related Experiment Video

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A 64Cu-Labeled Oxopurine Derivative for Translocator Protein-Targeted Inflammation Imaging.

Undram Ochirsukh1,2, Iqra Bibi1,3, Ho Young Kim1

  • 1Division of Applied RI, Korea Institute of Radiological & Medical Sciences (KIRAMS), Seoul, Republic of Korea.

Journal of Labelled Compounds & Radiopharmaceuticals
|June 2, 2026
PubMed
Summary

A novel positron emission tomography (PET) tracer, 64Cu-purine ([64Cu]5), targets the translocator protein (TSPO) for imaging inflammation and tumors. This tracer shows promise for visualizing inflammation within the tumor microenvironment.

Keywords:
64CuPETTSPOinflammationoxopurine

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Area of Science:

  • Biomedical imaging
  • Radiochemistry
  • Molecular imaging

Background:

  • Translocator protein (TSPO) is a biomarker for activated immune cells and tumors.
  • TSPO is a target for positron emission tomography (PET) imaging of inflammation and the tumor microenvironment.

Purpose of the Study:

  • To design and evaluate a novel TSPO-targeted PET tracer, 64Cu-purine ([64Cu]5).
  • To assess the tracer's potential for imaging inflammation-associated processes in tumors.

Main Methods:

  • Development of 64Cu-purine ([64Cu]5) using a purine scaffold and NOTA chelator.
  • In vitro and in vivo evaluation, including stability, lipophilicity, cellular uptake, PET imaging, and biodistribution studies.
  • Confirmation of tracer accumulation using autoradiography and immunohistochemistry.

Main Results:

  • 64Cu-purine ([64Cu]5) demonstrated high radiochemical purity, stability, and moderate lipophilicity.
  • The tracer showed higher uptake in inflammatory macrophages than tumor cells in vitro.
  • In vivo studies revealed preferential accumulation in inflamed and tumor tissues, confirming TSPO-targeting.

Conclusions:

  • 64Cu-purine ([64Cu]5) is a promising TSPO-targeting PET radiotracer.
  • The tracer can effectively image inflammation within the tumor microenvironment.
  • This tracer holds potential for clinical applications in oncology and inflammatory disease imaging.