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An Ex vivo Culture System to Study Thyroid Development
08:33

An Ex vivo Culture System to Study Thyroid Development

Published on: June 6, 2014

Thyroid hormone-dependent gene expression in differentiated embryonic stem cells and embryonal carcinoma cells:

Yan-Yun Liu1, Gregory A Brent

  • 1Molecular Endocrinology Laboratory, VA Greater Los Angeles Healthcare System, Building 114, Room 230, 11301 Wilshire Boulevard, Los Angeles, California 90073, USA.

Endocrinology
|November 20, 2004
PubMed

Insights

Thyroid hormone (T3) is crucial for early development. This study identified novel T3-responsive genes using stem cell models, revealing new insights into thyroid hormone actions during development.

Area of Science:

  • Developmental Biology
  • Endocrinology
  • Molecular Genetics

Background:

  • Thyroid hormone (T3) is essential for normal early development, but its specific target genes remain largely unidentified.
  • In vitro stem cell differentiation models can activate thyroid hormone receptor (TR) pathways, offering a tool to study T3-mediated gene expression.

Purpose of the Study:

  • To identify novel T3-responsive genes critical for early development using in vitro stem cell models.
  • To characterize TR-mediated gene expression in wild-type, TR-deficient, and TR-mutant embryonic stem cells.

Main Methods:

  • Development of in vitro stem cell models, including embryonic carcinoma (EC) and embryonic stem (ES) cells.
  • Gene expression profiling of wild-type ES cells compared to EC and TR-mutant ES cells following T3 stimulation.
  • Validation of candidate T3 target genes using in vitro and in vivo mouse models.

Main Results:

  • Embryonic carcinoma (EC) cells exhibited reduced T3 nuclear binding and modest expression of known T3 targets.
  • T3 stimulation of wild-type ES cells significantly altered mRNA expression of 610 genes, with ~60 meeting criteria for direct T3 regulation.
  • Five candidate genes (neurexophilin 2, SPNR, KBP, PSMA, synaptotagmin II) were identified and validated for T3 responsiveness.

Conclusions:

  • Novel T3 target genes involved in early development were identified using a unique stem cell system.
  • These findings expand the understanding of thyroid hormone's role and regulatory mechanisms in early development.
  • The identified genes, both induced and repressed by T3, may mediate crucial thyroid hormone actions during development.

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