Effect of thyroid hormone analogues on the displacement of 125I-L-triiodothyronine from hepatic and heart nuclei in vivo: Possible relationship to hormonal activity

J. H. Oppenheimer, H. L. Schwartz, W. Dillman, M. I. Surks

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The capacity of iodotyrosines and iodothyronine analogues to displace tracer[125I] L-3,5,3′ triiodothyronine from specific nuclear binding sites in rat liver and heart was related to the displacement capacity of nonradioactive triiodothyronine. Iodotyrosines and L-3,3′,5′ triiodothyronine ("reverse T3") were devoid of displacement activity. Analogues with 3,5 substitution in the "inner" ring and single "bulk" substitution in the 3′ position in the phenolic ring exhibited the strongest displacement activity. When the distribution, fractional removal rates and metabolic conversion of the analogues were taken into account, displacement activity appeared to correlate well with the reported thyromimetic activity. These results support the biologic relevance of the nuclear sites.

Original languageEnglish (US)
Pages (from-to)544-550
Number of pages7
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - Dec 10 1973


ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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