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Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
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An anti-inflammatory NOD-like receptor is required for microglia development
Celia E Shiau1, Kelly R Monk1, William Joo1
1Department of Developmental Biology, Stanford University, Stanford, CA 94305, USA.
Cell Reports
|December 10, 2013
Summary
The noncanonical NOD-like receptor (NLR) nlrc3-like is crucial for microglial development. It prevents premature inflammation in primitive macrophages, allowing them to migrate to the brain and form essential microglia.
Area of Science:
- Neuroimmunology
- Developmental Biology
- Innate Immunity
Background:
- Microglia, the brain's resident immune cells, originate from primitive macrophages during embryogenesis.
- The genetic regulation governing microglial development and the precise mechanisms controlling their differentiation remain incompletely understood.
- Understanding microglial development is critical for addressing neuroinflammatory and neurodegenerative diseases.
Purpose of the Study:
- To identify genetic factors controlling microglial development.
- To elucidate the role of noncanonical NOD-like receptors (NLRs) in microglial formation.
- To investigate the function of nlrc3-like in preventing aberrant inflammation during early brain immune cell development.
Main Methods:
- Conducted a genetic screen in zebrafish to identify genes essential for microglial development.
- Utilized mutant zebrafish lacking nlrc3-like to study its role in macrophage migration and inflammation.
- Performed molecular analyses to investigate the domains and binding partners of NLRC3-like protein.
Main Results:
- The noncanonical NLR nlrc3-like was identified as essential for microglial formation in zebrafish.
- Loss of nlrc3-like function led to systemic inflammation in primitive macrophages, characterized by increased pro-inflammatory cytokines.
- Mutant macrophages failed to migrate into the brain, preventing proper microglial development, indicating nlrc3-like acts cell-autonomously.
- NLRC3-like requires its pyrin and NACHT domains and interacts with ASC, suggesting inflammasome pathway regulation.
Conclusions:
- NLRC3-like acts as a crucial negative regulator of inflammation in microglia precursor cells.
- This regulation is vital for preventing inappropriate macrophage activation and enabling normal microglial development.
- NLRC3-like represents a key molecular target for understanding and potentially modulating brain immune cell development and function.
