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Dual-Targeting of PD-L1 and Integrin αvβ3 for Preclinical PET Imaging of Cancer

  • 0Chinese Academy of Medical Sciences and Peking Union Medical College, State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Beijing, 100050, China.
Chembiochem : a European Journal of Chemical Biology +

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August 14, 2025

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August 14, 2025

View abstract on PubMed

Summary

This summary is machine-generated.

A novel dual-targeting radiotracer, [64Cu]-PEG-RGD-TPP-1, enhances tumor detection by simultaneously targeting PD-L1 and αvβ3-integrin. This new tracer shows improved tumor uptake and retention for PET/CT imaging.

Area Of Science

  • Biomedical Imaging
  • Radiochemistry
  • Molecular Imaging

Background

  • Programmed death-ligand 1 (PD-L1) is overexpressed in various tumors.
  • αvβ3-integrin regulates PD-L1 expression and is also a tumor marker.
  • Dual-targeting strategies can improve tumor imaging by targeting multiple biomarkers.

Purpose Of The Study

  • To develop and evaluate a novel dual-targeting radiotracer, [64Cu]-PEG-RGD-TPP-1, for simultaneous PET/CT imaging of PD-L1 and αvβ3-integrin.
  • To compare the efficacy of the dual-targeting radiotracer with its single-targeting counterparts.
  • To assess the potential of the dual-targeting radiotracer for enhanced tumor detection and imaging contrast.

Main Methods

  • Synthesis of the dual-targeting radiotracer [64Cu]-PEG-RGD-TPP-1, incorporating TPP-1 and c(RGDyC) via a PEG linker.
  • In vitro and in vivo evaluation of serum stability and pharmacokinetic properties.
  • Comparison of tumor uptake and retention using PET/CT imaging and ex vivo biodistribution studies with single-targeting tracers ([64Cu]-PEG-TPP-1 and [64Cu]-TPP-1).
  • Exploration of combination therapy with X-ray irradiation to enhance imaging contrast.

Main Results

  • The dual-targeting radiotracer [64Cu]-PEG-RGD-TPP-1 demonstrated significantly higher tumor uptake and prolonged retention compared to single-targeting tracers.
  • The tracer exhibited moderate serum stability in vivo.
  • Combined application with X-ray irradiation showed potential for further enhancement of PET imaging contrast.
  • Ultrasmall tumor imaging capabilities were observed.

Conclusions

  • [64Cu]-PEG-RGD-TPP-1 is a promising dual-targeting radiotracer for noninvasive PET/CT imaging of tumors expressing PD-L1 and/or αvβ3-integrin.
  • The dual-targeting approach offers advantages in tumor uptake, retention, and imaging contrast.
  • This tracer holds potential for clinical translation in cancer diagnostics.

Keywords: