Preparation and preliminary biological evaluation of [153Sm] samarium AMD3100; towards a possible therapeutic chemokine receptor CXCR4 targeting complex

Document Type : Original Article

Authors

1 Research Center for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran AND Department of Nuclear Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran

2 Nuclear Science Research School, Nuclear Science and Technology Research Institute, Tehran, Iran

3 Clinic of Nuclear Medicine, University Medical Centre Mainz, Langenbeckstrasse 1, D-55131 Mainz, Germany

4 Department of Nuclear Pharmacy, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran

Abstract

Introduction: In continuation of recent development of possible C-X-C chemokine receptor type 4 (CXCR4) imaging agents, we report the development of a possible CXCR4 targeted therapy agent.
Methods: [153Sm]labeled 1,1′-[1,4-phenylenebis(methylene)] bis-1,4,8,11-tetraazacyclo -tetradecane ([153Sm]-AMD3100) was prepared using [153Sm]SmCl3 and AMD-3100 for 24h at 50°C in acetate buffer.Stability tests, partition coefficient determination, toxicity tests and biodistribution studies of the complex in wild-type rats were determined.
Results: The radiolabeled complex was prepared in high radiochemical purity (>95%; RTLC and >99% HPLC) and specific activity of 278 GBq/mmol and demonstrated significant stability up to 48h at 37 °C (in presence of human serum). Partition coefficient determination was calculated Log P= -1.09.Hepatotoxicity experiments demonstrated no distinguishable effect on hepatic enzymes in 10 days post injection.Initial complex biodistribution data showed significant liver and kidney accumulation in wild-type rats.

Conclusion: Since lung and spleen are considered as CXCR4 rich organs, the best lung/blood and spleen/blood ratios were achieved 12 and 7 at 24 h post injection. Further investigations are needed especially on therapeutic properties of this agent.

Keywords

Main Subjects

References

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Iranian Journal of Nuclear Medicine
Volume 23, Issue 1 - Serial Number 43
Serial number: 43
January 2015
Pages 36-43

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