99mTechnetium-HYNIC(tricine/TPPTS)-Aca-Bombesin(7–14) as a Targeted Imaging Agent with MicroSPECT in a PC-3 Prostate Cancer Xenograft Model
- Hildo J. K. Ananias
- ,
- Zilin Yu
- ,
- Rudi A. Dierckx
- ,
- Christophe van der Wiele
- ,
- Wijnand Helfrich
- ,
- Fan Wang
- ,
- Yongjun Yan
- ,
- Xiaoyuan Chen
- ,
- Igle J. de Jong
- , and
- Philip H. Elsinga
Abstract

The peptide bombesin (BN) and derivates thereof show high binding affinity for the gastrin-releasing peptide receptor (GRPR), which is highly expressed in primary and metastasized prostate cancer. We have synthesized a new BN-based radiopharmaceutical 99mtechnetium-HYNIC(tricine/TPPTS)-Aca-BN(7–14) (99mTc-HABN) and evaluated its GRPR targeting properties in vitro and in a xenograft tumor model for human prostate cancer in athymic mice. 99mTc-HABN was synthesized, and its lipophilicity and stability were investigated. The IC50, internalization and efflux properties were determined in vitro using the GRPR expressing human prostate cancer cell line PC-3. 99mTc-HABN biodistribution and microSPECT imaging were performed in PC-3 tumor-bearing athymic mice. 99mTc-HABN was prepared with high labeling yield (>90%), high radiochemical purity (>95%) and a specific activity of ∼19.8 MBq/nmol. The partition coefficient log D value was −1.60 ± 0.06. 99mTc-HABN proved to be stable in human serum for 6 h. The IC50 of HYNIC-Aca-BN(7–14) was 12.81 ± 0.14 nM. Incubation of PC-3 cells with 99mTc-HABN demonstrated rapid cellular internalization and a long intracellular retention time. When mice were injected with 99mTc-HABN, the activity was predominantly cleared via the kidneys. Uptake in the tumor was 2.24 ± 0.64% ID/g after 30 min, with a steady decrease during the 4 h study period. In vivo experiments with a blocking agent showed GRPR mediated uptake. 99mTc-HABN microSPECT imaging resulted in clear delineation of the tumor. 99mTc-HABN is a novel BN-based radiopharmaceutical that proved to be suitable for targeted imaging of prostate cancer with microSPECT using the human prostate cancer cell line PC-3 in a xenograft mouse model.
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