A dominant negative CREB (cAMP response element-binding protein) isoform inhibits thyrocyte growth, thyroid-specific gene expression, differentiation, and function

Lynda Q. Nguyen, Peter Kopp, Fred Martinson, Kristina Stanfield, Sanford I. Roth, J. Larry Jameson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

cAMP mediates the effects of TSH by regulating thyroid follicular cell proliferation, differentiation, and function. To assess the functional importance of the cAMP response element binding protein (CREB) in thyroid follicular cell regulation in vivo, we targeted the expression of a dominant negative (DN) CREB isoform to the thyroid glands of transgenic mice using a tissue-specific promoter. Transgenic mice exhibited severe growth retardation and primary hypothyroidism. Serum levels of TSH were elevated 8-fold above normal levels, and T4 and T3 levels were low. Histologically, the mutant thyroid glands were characterized by poorly developed follicles that were heterogeneous in size with diminished colloid. Ciliated thyroid epithellal cells were observed in the transgenic thy roid glands, suggesting a failure of follicular cell differentiation. Consistent with this hypothesis, the DN CREB transgene inhibited the expression of an array of genes including thyroglobuiin, thyroperoxidase, and the TSH receptor in semiquantitative RT-PCR experiments. Altered expression of the thyroid transcription factors Pax-8, TTF-1, and TTF-2 was also observed. These results demonstrate a critical role for CREB in thyroid growth, differentiation, and function in vivo.

Original languageEnglish (US)
Pages (from-to)1448-1461
Number of pages14
JournalMolecular Endocrinology
Volume14
Issue number9
DOIs
StatePublished - 2000

ASJC Scopus subject areas

  • Molecular Biology
  • Endocrinology

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