Resistance to thyroid hormone is modulated in vivo by the nuclear receptor corepressor (NCOR1)

Laura Fozzatti, Changxue Lu, Dong Wook Kim, Jeong Won Park, Inna Astapova, Oksana Gavrilova, Mark C. Willingham, Anthony N. Hollenberg, Sheue Yann Cheng

Research output: Contribution to journalArticlepeer-review

Abstract

Mutations in the ligand-binding domain of the thyroid hormone receptor β (TRβ) lead to resistance to thyroid hormone (RTH). These TRβ mutants function in a dominant-negative fashion to interfere with the transcription activity of wild-type thyroid hormone receptors (TRs), leading to dysregulation of the pituitary-thyroid axis and resistance in peripheral tissues. The molecular mechanism by which TRβ mutants cause RTH has been postulated to be an inability of the mutants to properly release the nuclear corepressors (NCORs), thereby inhibiting thyroid hormone (TH)-mediated transcription activity. To test this hypothesis in vivo, we crossed ThrbPV mice (a model of RTH) expressing a human TRβ mutant (PV) with mice expressing a mutant Ncor1 allele (Ncor1ΔID mice) that cannot recruit a TR or a PV mutant. Remarkably, in the presence of NCOR1ΔID, the abnormally elevated thyroid-stimulating hormone and TH levels found in ThrbPV mice were modestly but significantly corrected. Furthermore, thyroid hyperplasia, weight loss, and other hallmarks of RTH were also partially reverted in mice expressing NCOR1ΔID. Taken together, these data suggest that the aberrant recruitment of NCOR1 by RTH TRβ mutants leads to clinical RTH in humans. The present study suggests that therapies aimed at the TR-NCOR1 interaction or its downstream actions could be tested as potential targets in treating RTH.

Original languageEnglish (US)
Pages (from-to)17462-17467
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume108
Issue number42
DOIs
StatePublished - Oct 18 2011
Externally publishedYes

Keywords

  • Dominant negative activity
  • Mouse models
  • Thyroid hormone receptor mutant

ASJC Scopus subject areas

  • General

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