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198Au-labeled hydroxymethyl phosphines as models for potential therapeutic pharmaceuticals
D E Berning1, K V Katti, W A Volkert
1Center for Radiological Research, Department of Chemistry, University of Missouri, Columbia 65203, USA. dberning@nrel.nrel.gov
Nuclear Medicine and Biology
|September 29, 1998
Summary
Researchers developed new gold-198 complexes using water-soluble phosphines as potential gold-199 radiopharmaceuticals. The gold-198(HMPB)2+ complex demonstrated superior in vivo stability, showing promise for future applications.
Area of Science:
- Radiochemistry
- Medicinal Chemistry
- Nuclear Medicine
Background:
- Development of novel radiopharmaceuticals is crucial for advanced diagnostics and therapeutics.
- Gold isotopes, particularly gold-199, show potential for targeted therapies due to their decay properties.
- Water-soluble ligands are essential for creating stable and administrable radiometal complexes.
Purpose of the Study:
- To synthesize and characterize novel gold-198 complexes with water-soluble phosphine ligands.
- To evaluate these complexes as potential models for gold-199 radiopharmaceuticals.
- To assess the in vitro and in vivo stability of the developed gold complexes.
Main Methods:
- Synthesis of cationic and hydrophilic 198Au complexes using tris(hydroxymethyl)phosphine (THP), 1,2-bis[bis(hydroxymethyl)phosphino]benzene (HMPB), and 1,2-bis[bis(hydroxymethyl)phosphino]ethane (HMPE).
- Preparation of 198Au complexes via direct mixing of H198AuCl4 with the respective ligands.
- Assessment of in vitro stability across various pH and temperature conditions.
- Evaluation of in vivo stability and characterization using High-Performance Liquid Chromatography (HPLC).
Main Results:
- High radiochemical purity was achieved for all synthesized 198Au complexes.
- The complexes exhibited excellent in vitro stability over a broad range of pH and temperatures.
- Only the 198Au(HMPB)2+ complex demonstrated significant in vivo stability.
- HPLC analysis confirmed the formation of single species for each complex, consistent with macroscopic counterparts.
Conclusions:
- Novel water-soluble gold-198 phosphine complexes were successfully synthesized and characterized.
- The 198Au(HMPB)2+ complex shows promising in vivo stability, making it a suitable model for gold-199 radiopharmaceutical development.
- These findings provide a foundation for further investigation into gold-based radiotherapeutics.