The (Tc(N)(PNP))(2+) metal fragment labeled cholecystokinin-8 (CCK8) peptide for CCK-2 receptors imaging: in vitro and in vivo studies (Articolo in rivista)

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Label
  • The (Tc(N)(PNP))(2+) metal fragment labeled cholecystokinin-8 (CCK8) peptide for CCK-2 receptors imaging: in vitro and in vivo studies (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/psc.834 (literal)
Alternative label
  • Agostini S; Bolzati C; Didone E; Cavazza-Ceccato M; Refosco F; Aloj L; Arra C; Aurilio M; Tornesello A.L; Tesauro D; Morelli G (2007)
    The (Tc(N)(PNP))(2+) metal fragment labeled cholecystokinin-8 (CCK8) peptide for CCK-2 receptors imaging: in vitro and in vivo studies
    in Journal of peptide science (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Agostini S; Bolzati C; Didone E; Cavazza-Ceccato M; Refosco F; Aloj L; Arra C; Aurilio M; Tornesello A.L; Tesauro D; Morelli G (literal)
Pagina inizio
  • 211 (literal)
Pagina fine
  • 219 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://onlinelibrary.wiley.com/doi/10.1002/psc.834/abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 13 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1,3,4) Department of Pharmaceutical Sciences, University of Padua (2,5) ICIS - CNR, Padua (6-8) Department of Nuclear Medicine, Istituto Nazionale per lo Studio e la Cura dei Tumori, Fondazione G. Pascale, Naples (9-11) Research Center on Bioactive Peptides, CIRPeB, University of Naples Federico II (literal)
Titolo
  • The (Tc(N)(PNP))(2+) metal fragment labeled cholecystokinin-8 (CCK8) peptide for CCK-2 receptors imaging: in vitro and in vivo studies (literal)
Abstract
  • The radiolabeling of the natural octapeptide CCK8, derivatized with a cysteine residue (Cys-Gly-CCK8), by using the metal fragment [Tc-99m(N)(PNP3)](2+) (PNP3 = N,N-bis(dimethoxypropylphosphinoethyl)methoxyethylamine) is reported. The [Tc-99m(N)(NS-Cys-Gly-CCK8)(PNP3)](+) complex was obtained according to two methods (one-step or two-step procedure) that gave the desired compound in high yield. The complex is stable in aqueous solution and in phosphate buffer. In vitro challenge experiments with an excess of cysteine and glutathione indicate that no transchelation reactions occur, confirming the high thermodynamic stability and kinetic inertness of this compound. Stability studies carried out in human and mouse serum, as well as in mouse liver homogenates, show that the radiolabeled compound remains intact for prolonged incubation at 37 degrees C. Binding properties give K-d (19.0 +/- 4.6 nmol/l) and B-max (similar to 10(6) sites/cell) values in A431 cells overexpressing the CCK2-R. In vivo evaluation of the compound shows rapid and specific targeting to CCK2-R, a fourfold higher accumulation compared to nonreceptor expressing tumors. (literal)
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