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Expression of microglial response factor-1 in microglia and macrophages following cerebral ischemia in the rat
1Department of Neurology, Field of Neuroscience, Tohoku University Graduate School of Medicine, 1-1 Seiryo-machi, Aoba-ku, 980-8574, Sendai, Japan. katoh@mail.cc.tohoku.ac.jp
Abstract:
Microglial response factor-1 is a newly isolated microglial gene, which encodes a Ca(2+) binding protein MRF-1 expressed in microglia and macrophages. We induced 1 h of focal cerebral ischemia or 10 min of global cerebral ischemia in the rat, and investigated the expression of MRF-1 immunoreactivity following ischemia. MRF-1 was present in resting microglia and was upregulated in response to microglial activation. MRF-1 was localized to all the cells of the mononuclear phagocyte system (microglia, monocytes, and perivascular cells) that appeared in the ischemic brain.
Insights
Microglial response factor-1 (MRF-1) is a novel protein found in microglia and macrophages. MRF-1 expression increases with microglial activation following cerebral ischemia in rats.
Area of Science:
- Neuroscience
- Immunology
- Molecular Biology
Background:
- Microglia are key immune cells in the brain.
- Cerebral ischemia triggers microglial activation.
- Novel genes involved in microglial response are of significant interest.
Purpose of the Study:
- To investigate the expression and localization of Microglial Response Factor-1 (MRF-1) following cerebral ischemia.
- To understand the role of MRF-1 in activated microglia and macrophages in the ischemic brain.
Main Methods:
- Induction of focal and global cerebral ischemia in a rat model.
- Immunohistochemical analysis to detect MRF-1 immunoreactivity.
- Observation of MRF-1 expression in resting and activated microglia.
Main Results:
- MRF-1 is expressed in resting microglia and upregulated upon activation.
- MRF-1 immunoreactivity was detected in microglia, monocytes, and perivascular cells in the ischemic brain.
- MRF-1 is localized to cells of the mononuclear phagocyte system in response to ischemia.
Conclusions:
- MRF-1 is a marker of microglial activation and is involved in the inflammatory response to cerebral ischemia.
- MRF-1 plays a role in the mononuclear phagocyte system's response to ischemic injury.
- Further research into MRF-1 could reveal therapeutic targets for stroke.