Related Experiment Video
Updated: Aug 12, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Brain activation of monocyte lineage cells: brain-derived soluble factors differentially regulate BV2 microglia and
Lisa L Shafer1, John A McNulty, M Rita I Young
1Department of Cell Biology, Neurobiology and Anatomy, Loyola University of Chicago Medical Center, Maywood, Ill., USA.
Abstract:
Brain injury and subsequent neurodegeneration are often associated with infiltrating leukocytes and the activation of microglia as well as other infiltrating cells. However, the characteristics of activation are poorly understood. The objective of this study was to further the understanding of brain regulation of microglial activation. We used an organotypic coculture paradigm to assess how brain-derived soluble factors modulate microglia and peripheral macrophage activation through microscopy and flow cytometry techniques. In the presence of brain-derived soluble factors, the BV2 microglia cell line increased MHC II and phagocytic receptor (Fcgamma II/III) expression. The increased expression correlated with a functional increase in phagocytic activity, but did not correlate with an increase in allostimulation ability. Furthermore, this interaction was selective to an interaction between brain-derived soluble factor(s) and BV2 microglia, since it was not observed in the ANA1 macrophage cell line or in primary peritoneal macrophages. The results indicated that brain-derived soluble factor(s) modulate microglial activation in a manner that is distinct from the effects on peripheral macrophages. Moreover, our results suggest that inflammatory events associated with some types of brain injury may be induced by the brain without dependence on infiltrating peripheral macrophages or T lymphocytes.
Insights
Brain-derived factors uniquely activate microglia, enhancing their phagocytic activity without increasing allostimulation. This suggests the brain can initiate inflammation independently of peripheral immune cells following injury.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglial activation and peripheral leukocyte infiltration are key features of brain injury and neurodegeneration.
- The precise mechanisms regulating microglial activation in the brain remain incompletely understood.
Purpose of the Study:
- To investigate how brain-derived soluble factors influence the activation of microglia and peripheral macrophages.
- To elucidate the specific characteristics of microglial activation modulated by the brain microenvironment.
Main Methods:
- Utilized an organotypic coculture system to model brain-specific cellular interactions.
- Employed microscopy and flow cytometry to analyze changes in cell surface marker expression and phagocytic activity.
- Assessed the response of BV2 microglia, ANA1 macrophages, and primary peritoneal macrophages to brain-derived factors.
Main Results:
- Brain-derived soluble factors significantly increased MHC II and Fcgamma II/III receptor expression on BV2 microglia.
- This led to a functional enhancement in microglial phagocytic activity, but not allostimulation.
- The observed effects were specific to microglia, as peripheral macrophages (ANA1 and primary peritoneal) did not exhibit similar activation patterns.
Conclusions:
- Brain-derived soluble factors selectively modulate microglial activation, distinct from their effects on peripheral macrophages.
- Microglial activation by brain factors enhances phagocytosis, suggesting a role in brain homeostasis and injury response.
- The brain itself may initiate inflammatory events post-injury, independent of infiltrating peripheral macrophages or T lymphocytes.
Related Concept Videos
01:15Differentiation of Common Myeloid Progenitor Cells
01:24B Cell Activation and Differentiation
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...