Čes. slov. farm. 2009, 58(5):208-211
Comparison of renal accumulation of [DOTA0, 1-Nal3]-octreotide labelled with selected radiometals
- Charles University in Prague, Faculty of Pharmacy, Department of Pharmacology and Toxicology, Hradec Králové, Czech Republic
Radiolabelled somatostatin receptor-specific peptides are a useful tool in the diagnosis and/or radiotherapy of somatostatin-positive neuroendocrine tumours. However, significant renal uptake of the radiopeptides may result in radiotoxicological injure of the kidney. The aim of the study was to analyze the undesirable renal accumulation of a newly developed somatostatin receptor-specific peptide, [DOTA0, 1-Nal3]-octreotide (DOTA-NOC), labelled with 177Lu, 111In or 90Y. To quantify the accumulation rate of the radiopeptides, the renal uptake of 177Lu-DOTA-NOC, 111In-DOTA-NOC and 90Y-DOTA-NOC was compared with the accumulation of selected compounds known to be intensively concentrated in the renal cells, such as albumin or 99mTc-MAG3. The investigation studied the renal uptake in vitro at the cellular level using freshly isolated rat renal cells. The found results did not reveal a significant influence of the used radiolabel on the uptake in the rat renal cells. The studied radiopeptides exerted a lower renal uptake than the selected comparators. Nevertheless, the rate of accumulation of the studied radiopeptides in the renal rat cells seemed to be quantitatively relatively high. The results of the experiments confirmed that the used in vitro method might serve as a helpful tool for comparative studies or analyses of transport mechanisms in radiopharmaceuticals.
Keywords: somatostatin analogues; radiodiagnostic; radiotherapeutics; renal elimination
Grants and funding:
This study was supported by grant No. 124409/FaF/C-LEK of the Grant Agency of Charles University and performed in cooperation with COST Action BM0607.
Received: November 2, 2009; Accepted: November 11, 2009; Published: May 1, 2009 Show citation
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