Kawai K, Fujibayashi Y, Yonekura Y, Konishi J, Saji H, Kubodera A, Yokoyama A. An artificial amino acid radiopharmaceutical for single photon emission computed tomographic study of pancreatic amino acid transports 123I-3-iodo-alpha-methyl-L-tyrosine.
Ann Nucl Med 1992;
6:169-75. [PMID:
1389892 DOI:
10.1007/bf03178309]
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Abstract
123I-3-iodo-alpha-methyl-L-tyrosine (123I-L-AMT) was selected and its characteristics on pancreas accumulation, metabolic selectivity and metabolic stability of 125I-L-AMT were studied. The studies on rat tissue slice as well as mouse biodistribution proved very high accumulation of 125I-labeled L-AMT in the pancreas, which was remarkably inhibited by the active transport inhibitor, ouabain. 125I-L-AMT does not enter into protein synthesis and general amino acid catabolism. Moreover, 125I-L-AMT was very stable against enzymatic deiodination. Thus, the above studies indicated that the 123I-labeled L-AMT was an "artificial amino acid" radiopharmaceutical to be used for the selective measurement of the membrane amino acid transport rate in the pancreas.
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