β-Cyclodextrin Complexes of Hydrolyzable Adamantanoyl-IUdR Prodrugs - Radioiodination and Biodistribution in Mice Bearing Implanted KBALB Tumours

Author(s): Xiao-Hong (Jennifer) Yang, Shradha Singh, Piyush Kumar, Jim Diakur, Leonard I. Wiebe

Journal Name: Current Radiopharmaceuticals

Volume 2 , Issue 2 , 2009


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Abstract:

Purpose: Iododeoxyuridine (IUdR, 1), a thymidine mimic with antiviral and anti-cancer properties, has a very short in vivo half-life which limits its efficacy as a clinical therapeutic or diagnostic agent. This work reports the radioiodination of 1 and its adamantanoyl prodrugs 2 and 3, the β-cyclodextrin (β-CyD) complexation of the radiolabelled prodrugs (2* and 3* to β-CyD-2* and β-CyD-3*, respectively), and the biodistribution of 1*, β-CyD-2* and β-CyD-3* in tumor- bearing mice. Methods: The C-5-tributylstannyl-UdR synthons 1-TBS, 2-TBS and 3-TBS were prepared and then radioiodinated with Na[125I]I in acetic acid and hydrogen peroxide to afford 125I-labelled 1*, 2* and 3*. Biodistribution studies of 1*, β-CyD-2* and β-CyD-3* were undertaken in Balb/c mice bearing implanted KBALB tumours. Results: 1-TBS, 2-TBS and 3-TBS were synthesized in 70, 45 and 29 % yield, respectively. Radioiododestannylation afforded 1*, 2* and 3* in 25.5 %, 80 % and 45 % radiochemical yield, respectively. In vivo biodistribution patterns for 1*, β-CyD-2* and β- CyD-3* after i.v. injection into mice differed only marginally. Conclusions: Inclusion complexes are formed between β- CyD and adamantane-IUdR conjugates. Despite the strong complexation between β-CyD and 2* or 3*, the radiobiodistribution patterns of for 1*, β-CyD-2* and β-CyD-3* were not markedly different from each other in tumourbearing mice. Thus, despite creation of inclusion compounds with high dissociation constants, additional development is required to exploit the β-CyD inclusion complex approach for improved delivery of nucleoside derivatives.

Keywords: β-cyclodextrin, nucleosides, adamantanoyl-nucleoside prodrugs, inclusion complexes, radioiodination, KBALB tumours, biodistribution, iododeoxyuridine

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Article Details

VOLUME: 2
ISSUE: 2
Year: 2009
Published on: 01 March, 2012
Page: [137 - 142]
Pages: 6
DOI: 10.2174/1874471010902020137
Price: $65

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