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Biodistribution of two 131I-IMBA preparations, differently labelled, in mice with experimental B16 melanoma tumours
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Abstract
MATERIAL AND METHODS: The iodinated 131I-IMBA was obtained by means of 131I exchange for nonradioactive iodine atoms (method I) and by means of 131I substitution for a metalorganic group (method II). The last preparation was purified by chloroform extraction. The chemical purity was assessed by means of ascending thin layer chromatography (TLC). The biodistribution of 131I-IMBA in C57 Black mice was studied in animals with experimentally induced B16 mice melanoma tumours.
RESULTS: The mean labelling efficiency exceeded 95 and 80 % for methods I and II, respectively, at radiochemical purity > 95% in both cases. 131I-IMBA was vividly cumulated by melanoma tumours in mice. At 24-hours post 131I-IMBA administration the values of tumour /non-tumour ratios for the compound labelled by method II reached the following values: tumour/liver 10 ± 3, tumour/lung 15 ± 12, tumour/blood 153 ± 39, tumour/intestines 176 ± 26, tumour/kidneys 270 ± 107, and tumour/muscle 448 ± 82. These values exceeded, by an order of magnitude, the corresponding ratios for the same compound labelled by method I.
CONCLUSIONS: High values of tumour/non-tumour ratios indicate that 131I-IMBA could be a promising radiopharmaceutical for clinical diagnosis (staging) of melanomas in humans.
Abstract
MATERIAL AND METHODS: The iodinated 131I-IMBA was obtained by means of 131I exchange for nonradioactive iodine atoms (method I) and by means of 131I substitution for a metalorganic group (method II). The last preparation was purified by chloroform extraction. The chemical purity was assessed by means of ascending thin layer chromatography (TLC). The biodistribution of 131I-IMBA in C57 Black mice was studied in animals with experimentally induced B16 mice melanoma tumours.
RESULTS: The mean labelling efficiency exceeded 95 and 80 % for methods I and II, respectively, at radiochemical purity > 95% in both cases. 131I-IMBA was vividly cumulated by melanoma tumours in mice. At 24-hours post 131I-IMBA administration the values of tumour /non-tumour ratios for the compound labelled by method II reached the following values: tumour/liver 10 ± 3, tumour/lung 15 ± 12, tumour/blood 153 ± 39, tumour/intestines 176 ± 26, tumour/kidneys 270 ± 107, and tumour/muscle 448 ± 82. These values exceeded, by an order of magnitude, the corresponding ratios for the same compound labelled by method I.
CONCLUSIONS: High values of tumour/non-tumour ratios indicate that 131I-IMBA could be a promising radiopharmaceutical for clinical diagnosis (staging) of melanomas in humans.
Keywords
melanoma; aminoalkyl-iodobenzamides; radioiodinated IMBA
Title
Biodistribution of two 131I-IMBA preparations, differently labelled, in mice with experimental B16 melanoma tumours
Journal
Issue
Pages
48-52
Published online
2008-11-05
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924
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1061
Bibliographic record
Nucl. Med. Rev 2008;11(2):48-52.
Keywords
melanoma
aminoalkyl-iodobenzamides
radioiodinated IMBA
Authors
Michał Janczak
Janusz Kapuściński
Elżbieta Mikiciuk-Olasik
Marek Różalski
Anna Płachcińska
Jacek Kuśmierek