Abstract:
BACKGROUND:Clinical studies in women using technetium-99m (Tc)-Bombesin have shown successful radionuclide imaging of breast tumours overexpressing gastrin-releasing peptide receptors (GRPRs). Recent studies have demonstrated that most breast tumours overexpress folate receptors (FRα). AIM:The aim of this work was to synthesize the Lys(α,γ-Folate)-Lys(Tc-EDDA/HYNIC)-Bombesin (1-14) conjugate (Tc-Bombesin-Folate), as well as to assess the in-vitro and in-vivo potential of the radiopharmaceutical to target FRα and GRPR. METHODS:LysLys(HYNIC)-Bombesin (1-14) was conjugated to folic acid and the product was purified by size-exclusion high-performance liquid chromatography. Ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry were used for chemical characterization. Tc labelling was performed using ethylenediamine-N,N'-diacetic acid/tricine as coligands. In-vitro binding studies were carried out in T47D breast cancer cells (positive for FRα and GRPR). Biodistribution studies and micro-single-photon emission computed tomography/computed tomography imaging were carried out on athymic mice with T47D-induced tumours. RESULTS:High-performance liquid chromatography analyses indicated that the radioconjugate was obtained with high radiochemical purity (96±2.1%). In-vitro and in-vivo results showed significant uptake of the radiopharmaceutical in T47D cells and tumours (5.43% ID/g), which was significantly inhibited by preincubation with cold folic acid or cold Bombesin. CONCLUSION:The Tc-Bombesin-folate heterobivalent radiopharmaceutical significantly enhances in-vivo tumour uptake because of the concomitant interaction with FRα and GRPR.
journal_name
Nucl Med Communjournal_title
Nuclear medicine communicationsauthors
Aranda-Lara L,Ferro-Flores G,Ramírez Fde M,Ocampo-García B,Santos-Cuevas C,Díaz-Nieto L,Isaac-Olivé Kdoi
10.1097/MNM.0000000000000460subject
Has Abstractpub_date
2016-04-01 00:00:00pages
377-86issue
4eissn
0143-3636issn
1473-5628journal_volume
37pub_type
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