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E3, a hematopoietic-specific transcript directly regulated by the retinoic acid receptor alpha
L M Scott1, L Mueller, S J Collins
1Division of Molecular Medicine, Fred Hutchinson Cancer Research Center, Seattle, WA 98104, USA.
Blood
|October 1, 1996
Summary
Retinoic acid (RA) induces granulocytic differentiation by activating the retinoic acid receptor alpha (RAR alpha). This study identifies E3 as a hematopoietic-specific gene directly targeted by RAR alpha during this process.
Area of Science:
- Molecular Biology
- Cell Biology
- Hematopoiesis
Background:
- Retinoic acid (RA) plays a crucial role in myeloid development.
- RA-induced maturation is mediated by the retinoic acid receptor alpha (RAR alpha).
Purpose of the Study:
- To identify immediate-early genes induced by RA during granulocytic differentiation.
- To investigate the role of RAR alpha in regulating these genes.
Main Methods:
- Differential hybridization analysis of a cDNA library from murine MPRO promyelocyte cell line.
- RA induction experiments in HL60 and RA-resistant HL60R cells.
- Transfection assays to analyze promoter activity.
Main Results:
- Identified E3 as an immediate-early gene upregulated by RA within 60 minutes.
- E3 induction by RA was dependent on a functional RAR alpha gene.
- E3 is hematopoietic-specific, encoding a hydrophobic polypeptide, and its promoter contains a retinoic acid response element.
Conclusions:
- E3 is a hematopoietic-specific gene and an immediate transcriptional target of activated RAR alpha during myelopoiesis.
- This finding sheds light on the molecular mechanisms of RA-driven granulocytic differentiation.