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C/EBPbeta is required for 'emergency' granulopoiesis
Hideyo Hirai1, Pu Zhang, Tajhal Dayaram
1Harvard Institutes of Medicine and Harvard Stem Cell Institute, Boston, Massachusetts 02115, USA.
Nature Immunology
|June 6, 2006
Summary
During infections, the transcription factor C/EBPbeta drives emergency granulopoiesis by promoting granulocyte precursor differentiation and proliferation, unlike C/EBPalpha. This is crucial for host defense.
Area of Science:
- Hematology
- Immunology
- Molecular Biology
Background:
- Host defense during infections requires rapid granulocyte production from bone marrow progenitors.
- Steady-state granulopoiesis relies on the transcription factor C/EBPalpha.
- Transcriptional regulation of emergency granulopoiesis is not fully understood.
Purpose of the Study:
- To investigate the transcriptional mechanisms governing emergency granulopoiesis.
- To determine the role of C/EBP transcription factors in emergency granulopoiesis.
Main Methods:
- Utilized C/EBPalpha-deficient and C/EBPbeta-deficient progenitor cells.
- Administered cytokine stimulation and induced fungal infections in vivo.
- Analyzed granulocyte progenitor transcript levels and proliferation in vitro and in vivo.
Main Results:
- C/EBPalpha-deficient progenitors generated substantial granulocytes upon cytokine stimulation.
- Cytokine treatment or infection upregulated C/EBPbeta, but not C/EBPalpha or C/EBPepsilon.
- C/EBPbeta deficiency impaired emergency granulopoiesis, while C/EBPbeta inhibited proliferation less than C/EBPalpha.
Conclusions:
- C/EBPbeta plays a critical role in emergency granulopoiesis.
- Emergency granulopoiesis requires both differentiation and proliferation of granulocyte precursors, with C/EBPbeta facilitating these processes.