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The Boron–Neutron Capture Agent β-d-5-o-Carboranyl-2′-deoxyuridine Accumulates Preferentially in Dividing Brain Tumor Cells

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Summary

Boron–neutron capture therapy (BNCT) is based on the preferential targeting of tumor cells with 10B and subsequent irradiation with epithermal neutrons to produce a highly localized field of lethal α particles, while sparing neighboring non-targeted cells. BNCT treatment of 9L brain tumors in a rat model using β-d-5-o-carboranyl-2′-deoxyuridine (d-CDU) resulted in greater efficacy than predicted based on the assumption of a uniform tumor distribution of 10B. Thus, the geometric heterogeneity of dividing cells in brain tumors warranted studies on the cell cycle dependency of d-CDU accumulation, metabolism and entrapment in a relevant brain tumor cell system. U-271 human glioma cells were synchronized in G1 or S-phases of the cell cycle. The cellular accumulation and phosphorylation of d-CDU was measured in the G1 and S-phase cells using high-performance liquid chromatography (HPLC). Cells synchronized in the S-phase accumulated significantly higher amounts of d-CDU and produced larger amounts of negatively charged d-CDU monophosphate (d-CDU-MP) and nido-CDU metabolites than resting cells. Since brain tumors contain a larger proportion of cycling cells than neighboring tissue, these results support the hypothesis that in addition to breakdown of the blood-brain-barrier (BBB) in tumors, the preferential phosphorylation of d-CDU in cycling cells may further enrich the distribution of 10B in dividing cells. Therefore, dosimetry calculations that include the spatial distribution of cycling cells may be warranted for d-CDU.

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Correspondence to Raymond F. Schinazi.

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Moore, C., Hernández-Santiago, B.I., Hurwitz, S.J. et al. The Boron–Neutron Capture Agent β-d-5-o-Carboranyl-2′-deoxyuridine Accumulates Preferentially in Dividing Brain Tumor Cells. J Neurooncol 74, 275–280 (2005). https://doi.org/10.1007/s11060-004-8323-y

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  • DOI: https://doi.org/10.1007/s11060-004-8323-y

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