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Positron emission tomography of experimental melanoma with [76Br]5-bromo-2-thiouracil
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences. (Toxicology)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology. (BMS)
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology. (BMS)
2000 (English)In: Nuclear Medicine and Biology, ISSN 0969-8051, E-ISSN 1872-9614, Vol. 27, no 8, 845-9 p.Article in journal (Refereed) Published
Abstract [en]

Positron emission tomography (PET) has evolved as a new diagnostic modality in cancer patients. Thioureylenes, such as thiouracil and methimazole, are known to be incorporated into growing melanin and selectively retained in melanotic melanoma. In the present study we used [(76)Br]5-bromo-2-thiouracil as tracer for PET imaging of human and murine melanotic melanoma transplanted subcutaneously into rats. The melanomas were clearly depicted 1 day after the injection, when [(76)Br]5-bromo-2-thiouracil was retained in the tumors though the overall radioactivity concentration in the body had declined. Accumulation of (76)Br was also seen in bladder, liver, and kidney. In addition, the rats were simultaneously injected with [(125)I]5-iodo-2-thiouracil and the tissue distribution of radioactivity was mapped by whole-body autoradiography. The results confirmed the selective uptake of thiouracil in the melanoma where the concentration of (125)I-radioactivity was about three-fold higher than that in the liver and lungs. These results show the possibility of using [(76)Br]5-bromo-2-thiouracil for PET diagnostics of melanoma, including dosimetry, prior to targeted therapy using [(131)I]5-iodo-2-thiouracil or [(211)At]5-astato-2-thiouracil.

Place, publisher, year, edition, pages
2000. Vol. 27, no 8, 845-9 p.
Keyword [en]
Animals, Autoradiography, Bromine Radioisotopes, Humans, Iodine Radioisotopes, Male, Melanoma; Experimental/metabolism/*radionuclide imaging, Mice, Neoplasm Transplantation, Radiopharmaceuticals/*diagnostic use/pharmacokinetics, Rats, Rats; Nude, Research Support; Non-U.S. Gov't, Thiouracil/*analogs & derivatives/*diagnostic use/pharmacokinetics, Tissue Distribution, Tomography; Emission-Computed, Transplantation; Heterologous
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Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-73663DOI: 10.1016/S0969-8051(00)00147-5PubMedID: 11150719OAI: oai:DiVA.org:uu-73663DiVA: diva2:101573
Available from: 2008-05-16 Created: 2008-05-16 Last updated: 2017-12-14Bibliographically approved

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Tolmachev, VladimirSundin, Anders

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