Kidney uptake of 186/188Re(V)-DMSA is significantly reduced when the reducing agent is changed from stannous ion to metabisulfite
✍ Scribed by Kanchan Kothari; Drishty Satpati; Archana Mukherjee; H. D. Sarma; Meera Venkatesh; M. R. A. Pillai
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- French
- Weight
- 128 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0022-2135
- DOI
- 10.1002/jlcr.598
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✦ Synopsis
We describe the work carried out on the preparation of 186/188 Re(V)-DMSA, which showed lower kidney retention, formulated by using metabisulfite as the reducing agent. The complex was prepared by reducing 186/188 ReO 4 À (100 mg, 0.54 mM, $150 MBq) in the presence of Na 2 S 2 O 5 (30 mg, 0.15 mM) and reacting with DMSA (10 mg, 0.05 mM) in saline at pH 3.5 and at 808C for 1 h. The complex was characterized by TLC using acetone and saline as two different solvent systems. Reverse phase HPLC carried out using isocratic system with 90:10 water/acetonitrile mobile phase showed the existence of four species. Biodistribution studies were carried out in albino mice with 186/188 Re(V)-DMSA prepared via metabisulfite reductant [ 186/188 Re(V)-DMSA (MBS)] as well as stannous chloride reductant [ 186/188 Re(V)-DMSA (SnCl 2 )]. The distribution patterns were similar except for kidney uptake. Kidney retention in case of 186/188 Re(V)-DMSA (MBS) was lower [0.68 ( AE 0.06)%/g] than that observed in case of 186/188 Re(V)-DMSA (SnCl 2 ) [2.93( AE 0.93)%/g] after 24 h p.i. Though bone uptake was initially similar with both the preparations, there was substantial decrease in bone activity after 24 h p.i. with