NDLI: H-CRRETAWAC-OH, a Lead Structure for the Development of Radiotracer Targeting Integrin α 5 β 1 ?

Content Provider	PubMed Central
Author	Haubner, Roland Simone, Maschauer Einsiedel, Jürgen Eder, Iris E. Christine, Rangger Gmeiner, Peter Virgolini, Irene J. Prante, Olaf
Copyright Year	2014
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 α v β 3. Here we describe the synthesis and evaluation of [18F]FProp-Cys-Arg-Arg-Glu-Thr-Ala-Trp-Ala-Cys-OH, a radiolabelled peptide designed to selectively target the integrin α 5 β 1. Conjugation of 4-nitrophenyl-(RS)-2-[18F]fluoropropionate provided [18F]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 α 5 β 1 binding affinity in the nanomolar range, whereas affinity to α v β 3 and α IIb β 3 was >50 μM. Cell uptake studies using human melanoma M21 (α v β 3-positive andα 5 β 1-negative), human melanoma M21-L (α v β 3-negative and α 5 β 1-negative), and human prostate carcinoma DU145 (α v β 3-negative and α 5 β 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 α 5 β 1-negative M21 tumours did not confirm receptor-specific uptake of [18F]FProp-Cys-Arg-Arg-Glu-Thr-Ala-Trp-Ala-Cys-OH, although this radiopeptide revealed high affinity and substantial selectivity to α 5 β 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 α 5 β 1 expression in vivo.
Related Links	http://dx.doi.org/10.1155/2014/243185
Starting Page	243185
File Format	PDF
ISSN	23146133
e-ISSN	23146141
Journal	BioMed Research International
Volume Number	2014
Language	English
Publisher	Hindawi Publishing Corporation
Publisher Date	2014-01-01
Access Restriction	Open
Rights Holder	Hindawi Publishing Corporation
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Microbiology Medicine Biochemistry, Genetics and Molecular Biology

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