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C/EBPalpha directs monocytic commitment of primary myeloid progenitors
Dehua Wang1, Jenice D'Costa, Curt I Civin
1Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD 21231, USA.
Blood
|April 29, 2006
Summary
CCAAT-enhancer-binding protein alpha (C/EBPalpha) drives monocyte development by inducing PU.1 expression. Cooperation with c-Jun and NF-kappaB p50 is crucial for C/EBPalpha
Area of Science:
- * Hematology
- * Molecular Biology
- * Developmental Biology
Background:
- * The role of C/EBPalpha in myeloid lineage commitment post-granulocyte-monocyte progenitor generation is unclear.
- * Previous studies have not fully elucidated the specific mechanisms by which C/EBPalpha influences monopoiesis versus granulopoiesis.
Purpose of the Study:
- * To investigate the precise function of C/EBPalpha in directing myeloid cell fate towards monocytes or granulocytes.
- * To determine the molecular pathways and protein interactions involved in C/EBPalpha-mediated lineage commitment.
Main Methods:
- * Transduction of murine marrow cells with C/EBPalpha-estradiol receptor (ER) fusion protein or empty vector.
- * Culture of transduced cells with myeloid cytokines and varying estradiol concentrations to control C/EBPalpha activity.
- * Flow cytometry, morphological analysis, and quantitative PCR to assess cell lineage markers.
- * Methylcellulose colony formation assays to evaluate progenitor differentiation potential.
- * Analysis of C/EBPalpha variants with mutations in specific protein-interaction domains.
Main Results:
- * Activated C/EBPalpha-ER significantly increased monocyte populations (Mac1+/Gr1-/MPO-) and decreased granulocyte populations (Mac1+/Gr1+/MPOhi) at 48 hours.
- * C/EBPalpha-ER induced a 2-fold increase in monocytic colonies compared to granulocytic colonies in progenitor cultures.
- * C/EBPalpha-ER upregulated PU.1 mRNA, and PU.1 activation also promoted monocytic development.
- * A C/EBPalpha variant unable to interact with c-Jun failed to induce monopoiesis, while a variant unable to bind NF-kappaB p50 promoted granulopoiesis.
Conclusions:
- * C/EBPalpha is a key regulator promoting monopoiesis over granulopoiesis during myeloid commitment.
- * Transcriptional induction of PU.1 by C/EBPalpha is a critical mechanism contributing to monocyte differentiation.
- * Cooperation between C/EBPalpha, c-Jun, and NF-kappaB p50 is essential for the fidelity of monocytic lineage commitment.