Data/hora: 05/06/2024 14:20:17

Provedor de dados: | 52
País: | Brazil
Título: | Comparative biodistribution profile of [131I]VIP and [131I]VIP10-28
Autores: | Colturato,Maria Tereza; Muramoto,Emiko; Araújo,Elaine Bortoleti de.
Data: | 2005-10-01
Ano: | 2005
Palavras-chave: | Radiopharmaceuticals; Protein radioiodination; VIP; VIP10-28; Adenocarcinomas.
Resumo: | Various tumor cells express significantly higher amounts of VIP receptors (VIPR) that provided the basis for the clinical use of radiolabeled VIP for the in vivo localization of tumors. This work studied the labeling of VIP and VIP10-28 with iodine-131 to compare the biological distribution of the labeled compounds in Nuce mice and the affinity for tumor cells. Both VIP and VIP10-28 peptides contain two tyrosine residues, in positions 10 and 22, that are theoretically equally susceptible to radioiodination employing oxidative electrophilic substitution using oxidizing agents like Chloramine T. Radiochemical purity of the reaction mixture was determined by electrophoresis and HPLC. The VIP peptide and the fragment were labeled with radioiodine with good radiochemical yield (above 96%). Suitable, but important differences can be observed in biological distribution studies. Comparatively, blood clearance was faster for labeled VIP and perhaps because of this, the uptake in tumor was lower, especially during the first hour. These differences observed in the biological distribution of the compounds can be related to the lipophilicity of the labeled compounds.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000700012
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132005000700012
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.48 n.spe2 2005
Fonte: | info:eu-repo/semantics/openAccess