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Published on: August 15, 2012
CCAAT-enhancer binding protein alpha is expressed in activated microglial cells after brain injury
1Department of Pharmacology and Clinical Pharmacology, Faculty of Medicine and Health Science, University of Auckland, Private Bag 92019, Auckland, New Zealand.
Abstract:
Microglial cells play important roles in brain injury and repair and are implicated in diseases such as Alzheimer's disease, Creutzfeldt-Jacob disease, multiple sclerosis, the Aids Dementia Complex and stroke. Despite their importance in neuropathology, the underlying molecular basis for the activation of microglia after brain injury is not understood. We show, using RT-PCR, in situ hybridisation, immunocytochemistry, and electrophoretic mobility shift assay, that the CCAAT-enhancer binding protein alpha (C/EBP alpha), a sequence specific DNA-binding protein, is induced in microglial cells, but not astrocytes or neurons, after hypoxic-ischemic brain injury. These results suggest that C/EBP alpha might regulate gene expression and consequentially have a role in the activation and/or proliferation of microglia following brain injury.
Insights
CCAAT-enhancer binding protein alpha (C/EBP alpha) is activated in microglial cells after brain injury. This suggests C/EBP alpha plays a role in microglial activation and proliferation following neuropathology.
Area of Science:
- Neuroscience
- Cell Biology
- Molecular Biology
Background:
- Microglial cells are crucial for brain injury response and repair.
- Microglial involvement is noted in neurodegenerative diseases like Alzheimer's and multiple sclerosis.
- The molecular mechanisms driving microglial activation post-brain injury remain unclear.
Purpose of the Study:
- To investigate the molecular basis of microglial activation after brain injury.
- To identify key proteins involved in the response of microglia to hypoxic-ischemic brain injury.
Main Methods:
- Reverse Transcription Polymerase Chain Reaction (RT-PCR)
- In situ hybridization
- Immunocytochemistry
- Electrophoretic Mobility Shift Assay (EMSA)
Main Results:
- CCAAT-enhancer binding protein alpha (C/EBP alpha) was induced specifically in microglial cells.
- C/EBP alpha expression was not observed in astrocytes or neurons following injury.
- The study identified C/EBP alpha as a sequence-specific DNA-binding protein.
Conclusions:
- C/EBP alpha is upregulated in microglia after hypoxic-ischemic brain injury.
- C/EBP alpha may regulate gene expression in microglia.
- This points to a potential role for C/EBP alpha in microglial activation and proliferation post-injury.
