Abstract
Purpose
αvβ3 integrins are important cell adhesion receptors involved in angiogenic processes. Recently, we demonstrated using [18F]Galacto-RGD that monitoring of αvβ3 expression is feasible. Here, we introduce 68Ga- and 111In-labelled derivatives and compare them with [18F]Galacto-RGD.
Methods
For radiolabelling, cyclo(RGDfK(DOTA)) was synthesised using SPPS. For in vitro characterisation determination of partition coefficients, protein binding, metabolic stability, αvβ3 affinity and cell uptake and for in vivo characterization, biodistribution studies and micro positron emission tomography (PET) imaging were carried out. For in vivo and in vitro studies, human melanoma M21 (αvβ3 positive) and M21-L (αvβ3 negative) cells were used.
Results
Both tracers can be synthesised straightforward. The compounds showed hydrophilic properties and high metabolic stability. Up to 23% protein-bound activity for [68Ga]DOTA-RGD and only up to 1.4% for [111In]DOTA-RGD was found. Cell uptake studies indicate receptor-specific accumulation. This is confirmed by the biodistribution data. One hour p.i. accumulation in αvβ3-positive tumours was 2.9 ± 0.3%ID/g and in αvβ3-negative tumours 0.8 ± 0.1%ID/g for [68Ga]DOTA-RGD ([111In]DOTA-RGD: 1.9 ± 0.3%ID/g and 0.5 ± 0.2%ID/g; [18F]Galacto-RGD: 1.6 ± 0.2%ID/g and 0.4 ± 0.1%ID/g). Thus, tumour uptake ratios were comparable. Due to approx. 3-fold higher blood pool activities for [68Ga]DOTA-RGD, tumour/blood ratios were higher for [111In]DOTA-RGD and [18F]Galacto-RGD. However, microPET studies demonstrated that visualisation of αvβ3-positive tumours using [68Ga]DOTA-RGD is possible.
Conclusions
Our data indicate that [68Ga]DOTA-RGD allows monitoring of αvβ3 expression. Especially, the much easier radiosynthesis compared to [18F]Galacto-RGD would make it an attractive alternative. However, due to higher blood pool activity, [18F]Galacto-RGD remains superior for imaging αvβ3 expression. Introduction of alternative chelator systems may overcome the disadvantages.
Similar content being viewed by others
References
Storgard CM, Stupack DG, Jonczyk A, Goodman SL, Fox RI, Cheresh DA. Decreased angiogenesis and arthritic disease in rabbits treated with an αvβ3 antagonist. J Clin Invest. 1999;103:47–54.
Creamer D, Sullivan D, Bicknell R, Barker J. Angiogenesis in psoriasis. Angiogenesis. 2002;5:231–6.
Bishop GG, McPherson JA, Sanders JM, Hesselbacher SE, Feldman MJ, McNamara CA, Gimple LW, Powers ER, Mousa SA, Sarembock IJ. Selective αvβ3-receptor blockade reduces macrophage infiltration and restenosis after balloon angioplasty in the atherosclerotic rabbit. Circulation. 2001;103:1906–11.
Chavakis E, Riecke B, Lin J, Linn T, Bretzel RG, Preissner KT, Brownlee M, Hammes HP. Kinetics of integrin expression in the mouse model of proliferative retinopathy and success of secondary intervention with cyclic RGD peptides. Diabetologia. 2002;45:262–7.
Folkman J. Role of angiogenesis in tumour growth and metastasis. Semin Oncol. 2002;29:15–8.
Carmeliet P. Angiogenesis in life, disease and medicine. Nature. 2005;438:932–6.
Alghisi GC, Ruegg C. Vascular integrins in [111In]DOTA-RGD tumour angiogenesis: mediators and therapeutic targets. Endothelium. 2006;13:113–35.
Haubner R, Wester HJ. Radiolabeled tracers for imaging of tumour angiogenesis and evaluation of anti-angiogenic therapies. Curr Pharm Des. 2004;10:1439–55.
Haubner R. αvβ3-integrin imaging: a new approach to characterise angiogenesis? Eur J Nucl Med. Mol Imaging 2006;13:54–63.
Haubner R, Kuhnast B, Mang C, Weber WA, Kessler H, Wester HJ, Schwaiger M. [18F]Galacto-RGD: synthesis, radiolabeling, metabolic stability, and radiation dose estimates. Bioconjug Chem. 2004;15:61–9.
Haubner R, Wester HJ, Weber WA, Mang C, Ziegler SI, Goodman SL, et al. Noninvasive imaging of αvβ3 integrin expression using 18F-labeled RGD-containing glycopeptide and positron emission tomography. Cancer Res. 2001;61:1781–85.
Haubner R, Weber WA, Beer AJ, Vabuliene E, Reim D, Sarbia M, et al. Noninvasive visualization of the activated αvβ3 integrin in cancer patients by positron emission tomography and [18F]Galacto-RGD. PLoS Med. 2005;2:e70.
Beer AJ, Haubner R, Sarbia M, Goebel M, Luderschmidt S, Grosu AL, et al. Positron emission tomography using [18F]Galacto-RGD identifies the level of integrin αvβ3 expression in man. Clin Cancer Res. 2006;12:3942–49.
Decristoforo C, Knopp R, von Guggenberg E, Rupprich M, Dreger T, Hess A, et al. A fully automated synthesis for the preparation of 68Ga-labelled peptides. Nucl Med Common. 2007;28:870–75.
Breeman WA, de Jong M, de Blois E, Bernard BF, Konijnenberg M, Krenning EP. Radiolabelling DOTA-peptides with 68Ga. Eur J Nucl Med Mol Imaging. 2005;32:478–85.
Decristoforo C, Santos I, Pietzsch HJ, Kuenstler JU, Duatti A, Smith CJ, et al. Comparison of in vitro and in vivo properties of [99mTc]cRGD peptides labeled using different novel Tc-cores. Q J Nucl Med Mol Imaging. 2007;51:33–41.
Tai YC, Ruangma A, Rowland D, Siegel S, Newport DF, Chow PL, et al. Performance evaluation of the microPET Focus: a third-generation microPET scanner dedicated to animal imaging. J Nucl Med. 2005;46:455–63.
Kim JS, Lee JS, Im KC, Kim SJ, Kim SY, Lee DS, et al. Performance measurement of the microPET Foucus 120 scanner. J Nucl Med. 2007;48:1527–35.
Heppeler A, Froidevaux S, Mäcke H, Jermann E, Behe M, Powell P, Hennig M. Radiometal-labelled macrocyclic chelator-derivatised somatostatin analogue with superb tumour-targeting properties and potential for receptor-mediated internal radiotherapy. Chem Eur J. 1999;5:1974–81.
Clarke E, Martell A. Stabilities of trivalent metal ion complexes of the tetraacetate derivatives of 12-, 13- and 14-membered tetraazamacrocycles. Inorg Chim Acta. 1991;190:37–46.
Reichert D, Lewis J, Anderson C. Metal complexes as diagnostic tools. Coord Chem Rev. 1999;184:3–66.
Decristoforo C, Mather SJ. 99m-Technetium-labelled peptide-HYNIC conjugates: effects of lipophilicity and stability on biodistribution. Nucl Med Biol. 1999;26:389–96.
Acknowledgement
Stefan Schwarz, Svetlana Sirakanyan and Sybille Reder are gratefully acknowledged for their excellent technical assistance. We thank Bettina Sarg, Division of Clinical Biochemistry, Medizinische Universität Innsbruck for carrying out the LC–MS analysis. David A. Cheresh, The Scripps Institute, La Jolla, CA was acknowledged for kindly providing the melanoma M21 and M21-L cells.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Decristoforo, C., Hernandez Gonzalez, I., Carlsen, J. et al. 68Ga- and 111In-labelled DOTA-RGD peptides for imaging of αvβ3 integrin expression. Eur J Nucl Med Mol Imaging 35, 1507–1515 (2008). https://doi.org/10.1007/s00259-008-0757-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00259-008-0757-6