Retinoid X receptor and c-cerbA/thyroid hormone receptor regulate erythroid cell growth and differentiation

Mol Endocrinol. 1998 Sep;12(9):1269-79. doi: 10.1210/mend.12.9.0173.


Nuclear receptors are important regulators of erythroid cell development. Here we investigated the impact of retinoid X receptor (RXR), retinoic acid receptor (RAR), and of the c-erbA/thyroid hormone (T3) receptor (c-erbA/TR) on growth and differentiation of erythroid cells using an in vitro culture system of stem cell factor-dependent erythroid progenitors. RXR, RAR, and c-erbA/TR-specific ligands were found to induce erythroid-specific gene expression and to accelerate erythroid differentiation in culture, with T3 being most effective. Furthermore, while ligand-activated c-erbA/TR accelerated differentiation, unliganded c-erbA/TR effectively blocked differentiation and supported sustained progenitor growth in culture. Thus, c-erbA/TR appears to act as a binary switch affecting erythroid cell fate: unliganded c-erbA/TR supports growth while ligand-activated c-erbA/TR induces differentiation. Additionally, to determine the impact of RXR for erythroid cell development, dominant interfering mutant RXRs, lacking the transcriptional activator functions AF-1 and AF-2, or AF-2 only, or the entire DNA-binding domain, were introduced into erythroid progenitor cells via recombinant retrovirus vectors and analyzed for RXR-specific effects. It was found that expression of wild-type RXR and of the RXR mutants devoid of AF-1 and/or AF-2 supported a transient outgrowth of erythroid cells. In marked contrast, expression of the dominant interfering deltaDNA-binding domain RXR, containing a deletion of the entire DNA-binding domain, was incompatible with erythroid cell growth in vitro, suggesting a pivotal role of RXR for erythroid cell development.

MeSH terms

  • Animals
  • Cell Differentiation
  • Cells, Cultured
  • Chickens
  • Erythroid Precursor Cells / cytology*
  • Genetic Vectors
  • Humans
  • Ligands
  • Receptors, Retinoic Acid / genetics
  • Receptors, Retinoic Acid / physiology*
  • Receptors, Thyroid Hormone / physiology*
  • Retinoid X Receptors
  • Retroviridae
  • Transcription Factors / genetics
  • Transcription Factors / physiology*
  • Transcription, Genetic


  • Ligands
  • Receptors, Retinoic Acid
  • Receptors, Thyroid Hormone
  • Retinoid X Receptors
  • Transcription Factors