Abstract
Purpose
This study aimed to create new optical surgical navigation NIRF probes for prostate and breast cancers.
Procedures
IR800-linker-QWAVGHLM-NH2 with linker = GSG, GGG, and G-Abz4 were synthesized and characterized. IC50 for bombesin receptors (BBN-R) in PC-3 prostate and T47D breast cancer cells, fluorescence microscopy in PC-3 cells, and NIRF imaging in mice PC-3 tumor xenografts were studied.
Results
GGG, GSG, and G-Abz4 derivatives had IC50 (nM) for BBN-R+ PC-3 cells = 187 ± 31, 56 ± 5, and 2.6 ± 0.2 and T47D cells = 383 ± 1, 57.4 ± 1.2, and 3.1 ± 1.1, respectively. By microscopy the Abz4 derivative showed the highest uptake, was competed with by BBN, and had little to no binding to BBN-R− cells. In NIRF imaging the G-Abz4 probe was brighter than GGG probe in BBN-R+ tissues in vivo and tissues, tumors, and tumor slices ex vivo. Uptake could be partially blocked in BBN-R+ pancreas but not visibly in tumor.
Conclusions
Linker choice can dominate peptidic BBN-R binding. The G-Abz4 linker yields a higher affinity and specific BBN-R binder in this series of molecules.
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Abbreviations
- GRP:
-
Gastrin-releasing peptide
- NIRF:
-
Near-infrared fluorescent
- BBN:
-
Bombesin
- BBN-R:
-
Bombesin receptors
- Abz-4:
-
4-aminobenzoic acid
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Acknowledgments
Funding sources for this research are The Ohio State University College of Medicine, The Stefanie Spielman Foundation, and NIH 1 S10 RR025660-01A1.
Conflict of Interest
The authors declare that they have no conflict of interest.
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Ajay Shrivastava and Haiming Ding contributed equally to this work
Electronic supplementary material
HPLC traces of synthesized compounds, analytical data on synthesized molecules, additional mice organ and body images, and structures of two commercial fluors compared.
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Shrivastava, A., Ding, H., Kothandaraman, S. et al. A High-Affinity Near-Infrared Fluorescent Probe to Target Bombesin Receptors. Mol Imaging Biol 16, 661–669 (2014). https://doi.org/10.1007/s11307-014-0727-2
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DOI: https://doi.org/10.1007/s11307-014-0727-2