Uptake of 131I-metaiodobenzylguanidine by 6-23 rat medullary thyroid carcinoma

Graeme J. Poston, H. Daniel Fawcett, Courtney M. Townsend, Elena James, James L. Lieg, Martin L. Nusynowitz, James C. Thompson

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Uptake of 131iodine-metaiodobenzylguanidine (131I-MIBG) by 6-23 rat medullary thyroid carcinoma (MTC), was studied in vitro and in vivo. In vitro, there was an 8-fold increase in 131I uptake by 6-23 cells when labeled with 131I-MIBG (131I 24±15 cpm/106 cells, 131I-MIBG 196±9 cpm/106 cells). MIBG uptake in vitro was the same at 4°C and 37°C. In contrast, (131I-MIBG uptake by PC-12 rat pheochromocytoma cells were 200 times greater (131I-MIBG 42,412±6,755 cpm/106 cells). 131I-MIBG uptake by rat MTC cells in vitro were of a comparable magnitude to the uptake of 131I-MIBG by rat ileal enterochromaffin cells (RIE-1) and mouse colon cancer cells (MC-26). In vivo, uptake of 131I-MIBG by 6-23 MTC tumor was considerably less than in the normal tissues (muscle, liver, spleen, kidney, adrenal and thyroid). Gamma camera studies of 131I-MIBG uptake by 6-23 MTC tumors growing in Wag-Rij rats were only transiently positive in 1 out of 4 rats studied. We conclude that 131I-MIBG is poorly taken up by rat medullary thyroid carcinoma and is an unpredictable marker for localization of rat MTC.

Original languageEnglish (US)
Pages (from-to)1611-1616
Number of pages6
JournalLife Sciences
Issue number21
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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    Poston, G. J., Daniel Fawcett, H., Townsend, C. M., James, E., Lieg, J. L., Nusynowitz, M. L., & Thompson, J. C. (1989). Uptake of 131I-metaiodobenzylguanidine by 6-23 rat medullary thyroid carcinoma. Life Sciences, 44(21), 1611-1616. https://doi.org/10.1016/0024-3205(89)90456-6