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177Lu labelled polyaminophosphonates as potential agents for bone pain palliation

2002; Lippincott Williams & Wilkins; Volume: 23; Issue: 1 Linguagem: Inglês

10.1097/00006231-200201000-00011

1473-5628

Sudipta Chakraborty, Tapas Das, P.R Unni, Haladhar Dev Sarma, Grace Samuel, Sharmila Banerjee, M. Venkatesh, N. Ramamoorthy, M.R.A. Pillai,

Medical Imaging and Pathology Studies

Polyphosphonate ligands labelled with radioisotopes decaying by moderate energy beta emission have shown utility as palliative agents for painful bone metastasis. 177Lu (T(1/2)=6.71 d, Ebetamax=497 keV) has radionuclidic properties suitable for use in palliative therapy of bone metastasis. 177Lu was produced at a high specific activity and excellent radionuclidic purity by thermal neutron bombardment of a target prepared from natural Lu. Three polyaminomethylene phosphonate ligands, abbreviated as EDTMP, DTPMP and TTHMP, were synthesized and radiolabelled with 177Lu. Complexation parameters were optimized to achieve maximum yields (97-99.5%). All the complexes were found to retain their stability at room temperature even 14 days after preparation. Biodistribution studies of the complexes were carried out in Wistar rats. All the complexes showed significant bone uptake (6-6.5%/g in tibia at 3 h post-injection (p.i.)) with rapid clearance from blood and minimum uptake in soft tissues. These studies reveal that 177Lu complexes with the synthesized ligands have a potential use in palliative treatment of painful bone metastasis.