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Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

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Published on: February 21, 2018

Human C/EBP-epsilon activator and repressor isoforms differentially reprogram myeloid lineage commitment and

Richa Bedi¹, Jian Du, Arun K Sharma

¹Department of Biochemistry and Molecular Genetics, Section of Hematology-Oncology, College of Medicine, University of Illinois at Chicago, Chicago, IL 60607, USA.

|October 4, 2008

Summary

CCAAT enhancer-binding protein-epsilon (C/EBP-epsilon) isoforms regulate myeloid cell differentiation. Specific isoforms can reprogram progenitor cells towards eosinophils, neutrophils, or red blood cells, influencing lineage commitment.

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Reprogramming Mouse Embryonic Fibroblasts with Transcription Factors to Induce a Hemogenic Program

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Published on: December 16, 2016

Area of Science:

Hematology
Molecular Biology
Cell Biology

Background:

CCAAT enhancer-binding protein-epsilon (C/EBP-epsilon) is crucial for neutrophil and eosinophil terminal differentiation.
Human C/EBP-epsilon exists as four isoforms (32, 30, 27, and 14 kDa) generated by alternative splicing, promoters, and start sites.
Isoforms C/EBP-epsilon(32/30) act as transcriptional activators, while C/EBP-epsilon(27) and C/EBP-epsilon(14) may function as repressors.

Purpose of the Study:

To investigate the functional activities of different C/EBP-epsilon isoforms in myelopoiesis.
To determine how these isoforms influence myeloid progenitor cell differentiation and lineage commitment.

Main Methods:

Human CD34(+) progenitor cells were transduced with retroviral vectors encoding C/EBP-epsilon isoforms (32/30, 27, 14 kDa).
Transduced cells were purified using fluorescence-activated cell sorting.
Cells were analyzed in colony-forming assays and suspension cultures to assess differentiation.

Main Results:

C/EBP-epsilon(32/30) isoforms induced exclusive eosinophil differentiation and gene expression, independent of IL-5.
C/EBP-epsilon(27) inhibited eosinophil differentiation and GATA-1 activity, promoting granulocyte-macrophage differentiation.
C/EBP-epsilon(14) inhibited eosinophil development and promoted erythroid differentiation, an effect enhanced by erythropoietin.

Conclusions:

C/EBP-epsilon isoforms possess distinct functional activities that can reprogram myeloid lineage commitment.
The observed differentiation patterns align with the predicted roles of activator and repressor domains within the isoforms.
These findings highlight the isoform-specific regulatory roles of C/EBP-epsilon in hematopoiesis.