Noninvasive imaging of alpha(v)beta3 integrin expression using 18F-labeled RGD-containing glycopeptide and positron emission tomography.
The alpha(v)beta3 integrin is an important cell adhesion receptor involved in tumor-induced angiogenesis and tumor metastasis. Here we describe the 18F-labeling of the RGD-containing glycopeptide cyclo(-Arg-Gly-Asp-D-Phe-Lys(sugar amino acid)-) with 4-nitrophenyl 2-[18F]fluoropropionate and the evaluation of this compound in vitro and in tumor mouse models. Binding assays with isolated immobilized alpha(v)beta3, alpha(v)beta5, and alpha(IIb)beta3 as well as in vivo studies using alpha(v)beta3-positive and -negative murine and xenotransplanted human tumors demonstrated receptor-specific binding of the radiolabeled glycopeptide yielding high tumor:background ratios (e.g., 120 min postinjection: tumor:blood, 27.5; tumor:muscle, 10.2). First imaging results using a small animal positron emission tomograph suggest that this compound is suitable for noninvasive determination of the alpha(v)beta3 integrin status and therapy monitoring.
Haubner
R
R
Department of Nuclear Medicine, Technische Universität München, Germany. R.Haubner@lrz.tum.de
Wester
H J
HJ
Weber
W A
WA
Mang
C
C
Ziegler
S I
SI
Goodman
S L
SL
Senekowitsch-Schmidtke
R
R
Kessler
H
H
Schwaiger
M
M
D000818:Animals; D001386:Azides / Q000737:chemistry; D014408:Biomarkers, Tumor / Q000037:antagonists & inhibitors / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000276:immunology; D005260:Female; D005340:Fibrinogen / Q000378:metabolism; D005462:Fluorine Radioisotopes; D005690:Galactose / Q000031:analogs & derivatives* / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D007553:Isotope Labeling; D008545:Melanoma / Q000000981:diagnostic imaging / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000000981:diagnostic imaging* / Q000378:metabolism; D012516:Osteosarcoma / Q000000981:diagnostic imaging / Q000378:metabolism; D010456:Peptides, Cyclic / Q000737:chemistry / Q000494:pharmacology; D019275:Radiopharmaceuticals / Q000138:chemical synthesis / Q000493:pharmacokinetics; D019030:Receptors, Vitronectin / Q000037:antagonists & inhibitors / Q000378:metabolism*; D014018:Tissue Distribution; D014055:Tomography, Emission-Computed; D014157:Transcription Factors / Q000235:genetics* / Q000276:immunology; D014183:Transplantation, Heterologous; D019096:Vitronectin / Q000378:metabolism
D001386:Azides; D014408:Biomarkers, Tumor; D004268:DNA-Binding Proteins; D005462:Fluorine Radioisotopes; D010456:Peptides, Cyclic; D019275:Radiopharmaceuticals; D019030:Receptors, Vitronectin; D014157:Transcription Factors; D019096:Vitronectin; C099250:cyclic (arginyl-glycyl-aspartyl-phenylalanyl-lysyl); C092113:cyclo(arginyl-glycyl-aspartyl-phenylalanyl-valyl); C423503:fluorogalacto-RGD; C102277:4-nitrophenyl 2-fluoropropionate; D005340:Fibrinogen; D005690:Galactose