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.

European Journal of Nuclear Medicine and Molecular Imaging
Kazuma OgawaHideo Saji

Abstract

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. 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. 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 ...Continue Reading

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Citations

Feb 17, 2009·Nuclear Medicine and Biology·Kazuma OgawaHideo Saji
May 14, 2016·Molecular Pharmaceutics·George MakrisDionysia Papagiannopoulou
Oct 3, 2017·Biological & Pharmaceutical Bulletin·Hideo Saji
Mar 13, 2014·The International Journal of Artificial Organs·Kazuhiro TotoribeShun Higuchi
Sep 1, 2011·Molecular BioSystems·Elisa PalmaIsabel Santos
Jun 14, 2013·Bioconjugate Chemistry·Mashiho YanagiYasushi Arano

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