Evaluation of PET Imaging Performance of the TSPO Radioligand [18F]DPA-714 in Mouse and Rat Models of Cancer and Inflammation.
Mol Imaging Biol
; 18(1): 127-34, 2016 Feb.
Article
em En
| MEDLINE
| ID: mdl-26194010
ABSTRACT
PURPOSE:
Many radioligands have been explored for imaging the 18-kDa translocator protein (TSPO), a diagnostic and therapeutic target for inflammation and cancer. Here, we investigated the TSPO radioligand [(18)F]DPA-714 for positron emission tomography (PET) imaging of cancer and inflammation. PROCEDURES [(18)F]DPA-714 PET imaging was performed in 8 mouse and rat models of breast and brain cancer and 4 mouse and rat models of muscular and bowel inflammation.RESULTS:
[(18)F]DPA-714 showed different uptake levels in healthy organs and malignant tissues of mice and rats. Although high and displaceable [(18)F]DPA-714 binding is observed ex vivo, TSPO-positive PET imaging of peripheral lesions of cancer and inflammation in mice did not show significant lesion-to-background signal ratios. Slower [(18)F]DPA-714 metabolism and muscle clearance in mice compared to rats may explain the elevated background signal in peripheral organs in this species.CONCLUSION:
Although TSPO is an evolutionary conserved protein, inter- and intra-species differences call for further exploration of the pharmacological parameters of TSPO radioligands.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Pirazóis
/
Pirimidinas
/
Proteínas de Transporte
/
Receptores de GABA
/
Receptores de GABA-A
/
Compostos Radiofarmacêuticos
/
Tomografia por Emissão de Pósitrons
/
Inflamação
/
Neoplasias
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article