Cns Border Associated Macrophages (Bams) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
This page provides comprehensive information about the cell type. See the content below for detailed information.
Central nervous system border-associated macrophages (BAMs) are resident immune cells located at the interfaces between the CNS and peripheral tissues. They represent a distinct population from microglia and play crucial roles in immune surveillance, waste clearance, and neuroinflammation regulation.
¶ Location and Subsets
BAMs reside at strategic border regions:
- Dura mater, arachnoid mater, pia mater
- Express CD206, CD163 (mannose receptor markers)
- Monitor CSF and dural sinus drainage
- Surround blood vessels in leptomeninges and brain parenchyma
- Positioned at blood-brain barrier interface
- Express high levels of MHC class II
- Located in choroid plexus stroma
- Monitor CSF production
- Express distinctive transcription factors (IRF8)
- Associated with arachnoid granulations
- Role in CSF absorption monitoring
BAMs express distinctive markers:
| Marker |
Expression |
Function |
| CD163 |
High |
Scavenger receptor |
| CD206 |
High |
Mannose receptor |
| MHC-II |
Intermediate |
Antigen presentation |
| CCR2 |
Variable |
Chemokine receptor |
| CX3CR1 |
High |
Fractalkine receptor |
- Continuous scanning of border regions
- Phagocytosis of cellular debris
- Detection of peripheral pathogens
- Uptake of CSF-derived solutes
- Clearance of interstitial waste via glymphatic interface
- Processing of apoptotic cells
¶ Border Maintenance
- Support of blood-brain barrier integrity
- Regulation of meningeal lymphatic function
- Modulation of CSF composition
- Accumulation around amyloid plaques
- Potential source of inflammatory cytokines
- May contribute to vascular amyloid ( CAA)
- Interaction with peripheral immune system
- Detection of alpha-synuclein aggregates
- Potential entry point for peripheral proteins
- Modulation of neuroinflammation
- Present at lesion borders
- May become re-activated in progressive MS
- Contribute to demyelination
- Senescent BAM phenotype
- Reduced phagocytic capacity
- Increased pro-inflammatory secretions
BAMs offer therapeutic opportunities:
- Targeted drug delivery - Using mannose receptors for CNS entry
- Modulating neuroinflammation - Adjusting BAM polarization
- Enhancing waste clearance - Supporting glymphatic function
- Immune checkpoint modulation - Regulating antigen presentation
The study of Cns Border Associated Macrophages (Bams) has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Goldmann T, et al. (2016). A new type of microglia gene targeting shows CNS border macrophages. Nature Neuroscience.
- Van Hove H, et al. (2019). CNS border macrophages: Definition and heterogeneity. Trends in Neurosciences.
- Kipnis J (2016). Multifaceted immunological roles of CNS border-associated macrophages. Nature Reviews Immunology.