Evaluation of 111In-DOTA-F56 peptide targeting VEGFR1 for potential non-invasive gastric cancer xenografted tumor mice Micro-SPECT imaging.
Bioorg Med Chem Lett
; 30(14): 127248, 2020 07 15.
Article
en En
| MEDLINE
| ID: mdl-32527549
ABSTRACT
Non-invasive imaging of vascular endothelial growth factor receptor 1 (VEGFR1) remains a great challenge in the early diagnosis of tumors, especially in gastric cancer. Here, we designed and evaluated a novel 111In-DOTA-F56 peptide as a radioactive analogue of F56 (peptide WHSDMEWWYLLG) to bind VEGFR1. It was obtained by radiolabeling DOTA-F56 with 111InCl3 with 98% radiochemical purity and 1.4 ± 0.4 GBq/µmol specific activity. 111In-DOTA-F56 was obtained by the reaction of DOTA-F56 (10 µg) with 111InCl3 in pH 4.0 sodium acetate buffer at 85 °C for 20 min. 111In-DOTA-F56 shows good stability in 0.01 M Phosphate Buffered Saline (PBS) and 5% Human Serum Albumin (HSA). 111In-DOTA-F56 has a high binding affinity for human gastric cancer BGC-823 cells. Bio-distribution studies of 111In-DOTA-F56 were performed in nude mice xenografted with human gastric cancer BGC-823 cells and the results revealed tumor uptake accumulation. A blocking dose of DOTA-F56 significantly reduced the tumor uptake of 111In-DOTA-F56. Tumors were observed with Micro-SPECT images, and the uptake in the tumor increased with time from 4 h to 24 h. The MIP of the Micro-SPECT also showed that the excess DOTA-F56 can specifically block 111In-DOTA-F56 in a mouse tumor model. We successfully synthesized the 111In-DOTA-F56 VEGFR1-targeted peptide as a non-invasive molecule with fine radiochemical properties. Micro-SPECT indicates tumor uptake, which can be further blocked by excess of the F56 peptide, indicating that 111In-DOTA-F56 peptide has potential for early detection of VEGFR1 positive gastric cancer and is worthy of further clinical investigations.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Oligopéptidos
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Neoplasias Gástricas
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Tomografía Computarizada de Emisión de Fotón Único
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Receptor 1 de Factores de Crecimiento Endotelial Vascular
/
Compuestos Heterocíclicos con 1 Anillo
Tipo de estudio:
Prognostic_studies
/
Screening_studies
Límite:
Animals
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Humans
Idioma:
En
Revista:
Bioorg Med Chem Lett
Asunto de la revista:
BIOQUIMICA
/
QUIMICA
Año:
2020
Tipo del documento:
Article
País de afiliación:
Puerto Rico