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Preparing a 68Ga-labeled Arginine Glycine Aspartate (RGD)-peptide for Angiogenesis
Published on: January 7, 2019
[68Ga]NODAGA-RGD for imaging αvβ3 integrin expression
Peter A Knetsch1, Milos Petrik, Christoph M Griessinger
1Department of Nuclear Medicine, Innsbruck Medical University, Innsbruck, Austria. peter.knetsch@i-med.ac.at
European Journal of Nuclear Medicine and Molecular Imaging
|April 14, 2011
Summary
A novel Gallium-68 labeled peptide, (68)Ga-NODAGA-RGD, offers improved imaging of α(v)β(3) integrin expression. This radiotracer demonstrates high stability and better tumor visualization compared to existing agents.
Area of Science:
- Nuclear Medicine
- Radiochemistry
- Molecular Imaging
Background:
- Alpha-v-beta-3 (α(v)β(3)) integrin is a key target in angiogenesis.
- Radiolabeled RGD peptides and Positron Emission Tomography (PET) enable non-invasive monitoring of α(v)β(3) expression.
Purpose of the Study:
- To introduce and evaluate a novel Gallium-68 labeled NOTA-conjugated RGD peptide, (68)Ga-NODAGA-RGD.
- To compare the imaging properties of (68)Ga-NODAGA-RGD with (68)Ga-DOTA-RGD using small animal PET.
Main Methods:
- Solid-phase peptide synthesis (Fmoc strategy) for c(RGDfK(NODAGA)).
- Optimization of (68)Ga labeling conditions (temperature, peptide concentration, reaction time).
- In vitro characterization (partition coefficient, protein binding, serum stability, binding affinity, cell uptake) and in vivo evaluation (biodistribution, microPET imaging) using α(v)β(3)-positive (M21) and negative (M21-L) melanoma cells.
Main Results:
- High radiochemical yield and purity (>96%) achieved for (68)Ga-NODAGA-RGD within 5 minutes at room temperature.
- High α(v)β(3) binding affinity (IC50 = 4.7 ± 1.6 nM) and receptor-specific uptake observed.
- Superior stability in buffer, FeCl(3), and human serum, with 12-fold lower protein binding compared to (68)Ga-DOTA-RGD.
- Improved tumor-to-blood ratios (11 vs. 4) and enhanced microPET imaging of receptor-specific tumor accumulation.
Conclusions:
- (68)Ga-NODAGA-RGD offers easy accessibility, high stability, and excellent imaging properties.
- It presents a promising alternative to current (18)F-labeled RGD peptides for imaging α(v)β(3) expression.
