H-CRRETAWAC-OH, a Lead Structure for the Development of Radiotracer Targeting Integrin Alpha5Beta1?
Haubner R, Maschauer S, Einsiedel J, Eder IE, Rangger C, Gmeiner P, Virgolini IJ, Prante O (2014)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2014
Journal
Publisher: Hindawi Publishing Corporation
Book Volume: 2014
Pages Range: 243185
Article Number: 243185
DOI: 10.1155/2014/243185
Abstract
Imaging of angiogenic processes is of great interest in preclinical research as well as in clinical settings. The most commonly addressed target structure for imaging angiogenesis is the integrin ?(v)?(3). Here we describe the synthesis and evaluation of [(18)F]FProp-Cys(*)-Arg-Arg-Glu-Thr-Ala-Trp-Ala-Cys(*)-OH, a radiolabelled peptide designed to selectively target the integrin ?(5)?(1). Conjugation of 4-nitrophenyl-(RS)-2-[(18)F]fluoropropionate provided [(18)F]FProp-Cys(*)-Arg-Arg-Glu-Thr-Ala-Trp-Ala-Cys(*)-OH in high radiochemical purity (>95%) and a radiochemical yield of approx. 55%. In vitro evaluation showed ?(5)?(1) binding affinity in the nanomolar range, whereas affinity to ?(v)?(3) and ?(IIb)?(3) was >50 ?M. Cell uptake studies using human melanoma M21 (?(v)?(3)-positive and ?(5)?(1)-negative), human melanoma M21-L (?(v)?(3)-negative and ?(5)?(1)-negative), and human prostate carcinoma DU145 (?(v)?(3)-negative and ?(5)?(1)-positive) confirmed receptor-specific binding. The radiotracer was stable in human serum and showed low protein binding. Biodistribution studies showed tumour uptake ranging from 2.5 to 3.5% ID/g between 30 and 120 min post-injection. However, blocking studies and studies using mice bearing ?(5)?(1)-negative M21 tumours did not confirm receptor-specific uptake of [(18)F]FProp-Cys(*)-Arg-Arg-Glu-Thr-Ala-Trp-Ala-Cys(*)-OH, although this radiopeptide revealed high affinity and substantial selectivity to ?(5)?(1) in vitro. Further experiments are needed to study the in vivo metabolism of this peptide and to develop improved radiopeptide candidates suitable for PET imaging of ?(5)?(1) expression in vivo.
Authors with CRIS profile
Simone Maschauer
Professur für Molekulare Bildgebung und Radiochemie
Jürgen Einsiedel
Lehrstuhl für Pharmazeutische Chemie
Peter Gmeiner
Lehrstuhl für Pharmazeutische Chemie
Olaf Prante
Professur für Molekulare Bildgebung und Radiochemie
Additional Organisation(s)
Involved external institutions
Austria (AT)How to cite
APA:
Haubner, R., Maschauer, S., Einsiedel, J., Eder, I.E., Rangger, C., Gmeiner, P.,... Prante, O. (2014). H-CRRETAWAC-OH, a Lead Structure for the Development of Radiotracer Targeting Integrin Alpha5Beta1? BioMed Research International, 2014, 243185. https://dx.doi.org/10.1155/2014/243185
MLA:
Haubner, Roland, et al. "H-CRRETAWAC-OH, a Lead Structure for the Development of Radiotracer Targeting Integrin Alpha5Beta1?" BioMed Research International 2014 (2014): 243185.
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