Abstract
Purpose
Targeted delivery of alpha-particle-emitting radionuclides is a promising novel option in cancer therapy. We generated stable conjugates of the vascular tumour-homing peptide F3 both with 225Ac and 213Bi that specifically bind to nucleolin on the surface of proliferating tumour cells. The aim of our study was to determine the therapeutic efficacy of 225Ac-DOTA-F3 in comparison with that of 213Bi-DTPA-F3.
Methods
ID50 values of 213Bi-DTPA-F3 and 225Ac-DOTA-F3 were determined via clonogenic assays. The therapeutic efficacy of both constructs was assayed by repeated treatment of mice bearing intraperitoneal MDA-MB-435 xenograft tumours. Therapy was monitored by bioluminescence imaging. Nephrotoxic effects were analysed by histology.
Results
ID50 values of 213Bi-DTPA-F3 and 225Ac-DOTA-F3 were 53 kBq/ml and 67 Bq/ml, respectively. The median survival of control mice treated with phosphate-buffered saline was 60 days after intraperitoneal inoculation of 1 × 107 MDA-MB-435 cells. Therapy with 6 × 1.85 kBq of 225Ac-DOTA-F3 or 6 × 1.85 MBq of 213Bi-DTPA-F3 prolonged median survival to 95 days and 97 days, respectively. While F3 labelled with short-lived 213Bi (t 1/2 46 min) reduced the tumour mass at early time-points up to 30 days after treatment, the antitumour effect of 225Ac-DOTA-F3 (t 1/2 10 days) increased at later time-points. The difference in the fraction of necrotic cells after treatment with 225Ac-DOTA-F3 (43%) and with 213Bi-DTPA-F3 (36%) was not significant. Though histological analysis of kidney samples revealed acute tubular necrosis and tubular oedema in 10–30% of animals after treatment with 225Ac-DOTA-F3 or 213Bi-DTPA-F3, protein casts were negligible (2%), indicating only minor damage to the kidney.
Conclusion
Therapy with both 225Ac-DOTA-F3 and 213Bi-DTPA-F3 increased survival of mice with peritoneal carcinomatosis. Mild renal toxicity of both constructs favours future therapeutic application.
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Acknowledgments
This work was supported by the Deutsche Forschungsgemeinschaft (SFB 824) and by the European Commission FP7 Collaborative Project TARCC HEALTH-F2-2007-201962.
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Essler, M., Gärtner, F.C., Neff, F. et al. Therapeutic efficacy and toxicity of 225Ac-labelled vs. 213Bi-labelled tumour-homing peptides in a preclinical mouse model of peritoneal carcinomatosis. Eur J Nucl Med Mol Imaging 39, 602–612 (2012). https://doi.org/10.1007/s00259-011-2023-6
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DOI: https://doi.org/10.1007/s00259-011-2023-6