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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Ligands for mapping alphavbeta3-integrin expression in vivo.

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Targeting alpha(v)beta(3)-integrin with RGD ligands offers a promising approach for cancer therapy and imaging. Development of novel imaging probes allows for noninvasive assessment of disease severity and monitoring of anti-angiogenic therapy effectiveness.

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Area of Science:

  • Integrin biology and cancer research.
  • Development of targeted molecular imaging agents.
  • Pharmacology and drug development.

Background:

  • Alpha(v)beta(3)- and alpha(5)beta(1)-integrins are crucial for angiogenesis and tumor metastasis.
  • Alpha(v)beta(3)-integrin is a key target for anti-cancer therapies, leading to the development of RGD-containing ligands like cilengitide.
  • Individualized medicine necessitates noninvasive methods to assess disease severity and monitor therapy by visualizing alpha(v)beta(3)-integrin expression.

Purpose of the Study:

  • To review the synthesis and assessment of targeted probes for alpha(v)beta(3)-integrin.
  • To highlight the development of imaging agents for nuclear imaging (PET, SPECT), optical imaging, and MRI.
  • To discuss the ideal characteristics of these probes, including selective accumulation, high affinity, and in vivo stability.

Main Methods:

  • Synthesis and preclinical/clinical evaluation of RGD-containing cyclic peptides and their derivatives.
  • Radiolabeling of ligands for PET and SPECT imaging (e.g., using isotopes like 18F, 68Ga, 64Cu, 111In, 177Lu).
  • Development of multimers, nanoparticles, and peptidomimetics for enhanced targeting and imaging.

Main Results:

  • Various RGD-based probes, including radiolabeled peptides, multimers, and nanoparticles, have been developed and evaluated.
  • [(18)F]Galacto-RGD has shown success in over 100 patients, enabling specific imaging of alpha(v)beta(3) expression with high tumor-to-background ratios.
  • Multimeric constructs and modified ligands demonstrated improved affinity and targeting efficiency in vivo.

Conclusions:

  • Targeted imaging probes for alpha(v)beta(3)-integrin are advancing personalized cancer medicine.
  • These probes facilitate noninvasive monitoring of anti-angiogenic therapy and disease progression.
  • Continued development of RGD-based imaging agents holds significant promise for improved cancer diagnosis and treatment management.