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Usefulness of Competitive Inhibitors of Protein Binding for Improving the Pharmacokinetics of 186Re-MAG3-conjugated Bisphosphonate (186Re-MAG3-HBP), an Agent for Treatment of Painful Bone Metastases

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Date 2008 Aug 19
PMID 18709369
Citations 7
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Abstract

Purpose: We have developed a (186)Re-mercaptoacetylglycylglycylglycine complex-conjugated bisphosphonate ((186)Re-MAG3-HBP) for the treatment of painful bone metastases. We assumed competitive inhibitors of protein binding to be useful for procuring a favorable biodistribution of (186)Re-MAG3-HBP for the palliation of bone pain because it has been reported that the concurrent administration of (99m)Tc-MAG3 and drugs with high affinity for serum protein produced competitive displacement at specific binding sites and enhanced total clearance and tissue distribution.

Methods: The displacement effects of several protein-binding inhibitors on the protein binding of (186)Re-MAG3-HBP were investigated. Biodistribution experiments were performed by intravenously administering (186)Re-MAG3-HBP into rats with ceftriaxone as a competitive protein-binding inhibitor or saline.

Results: The protein binding of (186)Re-MAG3-HBP in rat serum, human serum, and a human serum albumin solution was significantly decreased by the addition of ceftriaxone, which has high affinity for binding site I on serum albumin. In the biodistribution experiments, pretreatment with ceftriaxone enhanced the clearance of the radioactivity of (186)Re-MAG3-HBP in blood and nontarget tissues but had no effect on accumulation in bone.

Conclusions: The findings suggested that the use of protein-binding competitive inhibitors would be effective in improving the pharmacokinetics of radiopharmaceuticals with high affinity for serum protein.

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