Disease-Associated Microglia (DAM)

Introduction

Disease Associated Microglia (Dam) is a cell type relevant to neurodegenerative disease research. This page covers its role in brain function, involvement in disease processes, and significance for therapeutic strategies.

Overview

flowchart TD
    Dam["Dam"] -->|"associated with"| Alzheimer_s_Disease["Alzheimer's Disease"]
    Dam["Dam"] -->|"component of"| Microglia["Microglia"]
    Dam["Dam"] -->|"associated with"| Neurodegenerative_Diseases["Neurodegenerative Diseases"]
    DAM["DAM"] -->|"involved in"| Phagocytosis["Phagocytosis"]
    DAM["DAM"] -->|"associated with"| microglia["microglia"]
    Dam["Dam"] -->|"protects against"| Neurodegeneration["Neurodegeneration"]
    DAM["DAM"] -->|"involved in"| Alzheimer_s_Disease["Alzheimer's Disease"]
    DAM["DAM"] -->|"mediates"| Amyloid_Beta_Phagocytosis["Amyloid-Beta Phagocytosis"]
    DAM["DAM"] -->|"associated with"| NEURODEGENERATION["NEURODEGENERATION"]
    DAM["DAM"] -->|"associated with"| ALZHEIMERS["ALZHEIMERS"]
    DAM["DAM"] -->|"expressed in"| CNS["CNS"]
    DAM["DAM"] -->|"interacts with"| SYK["SYK"]
    DAM["DAM"] -->|"activates"| SYK["SYK"]
    TREM2["TREM2"] -->|"activates"| DAM["DAM"]
    style DAM fill:#4fc3f7,stroke:#333,color:#000

Disease-associated microglia (DAM), also known as neurodegenerative disease-associated microglia (NAM), represent a specialized microglial activation state observed in various neurodegenerative conditions including Alzheimer’s disease, Parkinson’s disease, and ALS. DAM cells adopt a distinct transcriptional profile that differs from both surveilling (homeostatic) microglia and inflammatory (M1) microglia

Multi-Taxonomy Classification

Taxonomy Database Cross-References

Morphology & Electrophysiology

• Morphology: neuron associated cell (source: Cell Ontology)

  • Morphology can be inferred from Cell Ontology classification

PanglaoDB Marker Cross-References

• Unknown (PanglaoDB):

External Database Links

• Cell Ontology (CL:0000095)

• OBO Foundry (CL:0000095)

• Allen Brain Cell Atlas

• CellxGene Census

• Human Cell Atlas

• PanglaoDB

Taxonomy & Classification

PanglaoDB Marker Cross-References

• Unknown (PanglaoDB):

External Database Links

• Cell Ontology (CL:0000095)

• OBO Foundry (CL:0000095)

• Allen Brain Cell Atlas

• CellxGene Census

• PanglaoDB

Molecular Signature

Stage 1 DAM Markers

• TREM2-independent activation

• CD86 upregulation

• MHC-II expression increased

• IL-1β production

Stage 2 DAM Markers

• TREM2-dependent pathway activation

• APOE expression

• TGFBI (Transforming Growth Factor Beta Induced)

• LPL (Lipoprotein Lipase)

• CST3 (Cystatin C)

• Tyrobp (TYROBP/DAP12) upregulation

Core DAM Genes

Role in Neurodegeneration

Alzheimer’s Disease

In AD, DAM cells cluster around amyloid plaques and adopt a protective phenotype in early disease stages, attempting to clear toxic protein aggregates. However, chronic DAM activation can become maladaptive^{2(2018)2018 · Molecular Neurodegeneration · DOI 10.1186/s13024-018-0293-1Open reference}:

• Plaque-associated microglia show DAM signature

• TREM2 variants increase AD risk (R47H, R62H)

• DAM may limit Aβ spread but also contribute to synaptic loss

Parkinson’s Disease

In PD and related synucleinopathies, DAM cells respond to α-synuclein aggregates:

• Upregulation of TREM2 and APOE

• Enhanced phagocytosis of pathological α-synuclein

• Potential role in propagating pathology via exosome release

Amyotrophic Lateral Sclerosis (ALS)

DAM-like cells in ALS show:

• Upregulation of TREM2 pathway genes

• Response to motor neuron degeneration

• Potential dual roles in both protective and detrimental inflammation

Therapeutic Implications

Targeting DAM Pathways

1. TREM2 Agonists - Enhance microglial clearance function

2. APOE Modulation - Reduce lipid accumulation in microglia

3. CSF1R Inhibitors - Deplete disease-promoting microglial populations

Biomarker Potential

DAM signatures in CSF or blood may serve as:

• Diagnostic markers for neurodegenerative disease stage

• Pharmacodynamic biomarkers for immunomodulatory therapies

• Cell-Types/Disease-Associated-Microglia-Dam — This page

Background

The study of Disease Associated Microglia (Dam) 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.

External Links

• PubMed - Biomedical literature

• Alzheimer’s Disease Neuroimaging Initiative - Research data

• Allen Brain Atlas - Brain gene expression data

External Links

• ClinicalTrials.gov - Urolithin Aparkin)

• Science - Mitophagy and Aging Related Analyses:

• TREM2 agonism vs antagonism in DAM microglia 🔄

• TREM2 agonism vs antagonism in DAM microglia 🔄 Related Analyses:

• TREM2 agonism vs antagonism in DAM microglia 🔄

• TREM2 agonism vs antagonism in DAM microglia 🔄

Pathway Diagram

The following diagram shows the key molecular relationships involving Disease-Associated Microglia (DAM) discovered through SciDEX knowledge graph analysis:

graph TD
    TREM2["TREM2"] -->|"activates"| DAM["DAM"]
    APOE["APOE"] -->|"activates"| DAM["DAM"]
    ASTROCYTES["ASTROCYTES"] -->|"treats"| DAM["DAM"]
    NEUROINFLAMMATION["NEUROINFLAMMATION"] -->|"causes"| DAM["DAM"]
    MICROGLIA["MICROGLIA"] -->|"interacts with"| DAM["DAM"]
    MITOPHAGY["MITOPHAGY"] -->|"protects against"| DAM["DAM"]
    FRONTAL_CORTEX["FRONTAL CORTEX"] -->|"associated with"| DAM["DAM"]
    NLRP3_INFLAMMASOME["NLRP3 INFLAMMASOME"] -->|"associated with"| DAM["DAM"]
    HIPPOCAMPUS["HIPPOCAMPUS"] -->|"associated with"| DAM["DAM"]
    CORTEX["CORTEX"] -->|"associated with"| DAM["DAM"]
    VORINOSTAT["VORINOSTAT"] -->|"associated with"| DAM["DAM"]
    TREM2_APOE_axis["TREM2-APOE axis"] -->|"co associated with"| DAM["DAM"]
    style TREM2 fill:#4fc3f7,stroke:#333,color:#000
    style DAM fill:#ce93d8,stroke:#333,color:#000
    style APOE fill:#ce93d8,stroke:#333,color:#000
    style ASTROCYTES fill:#80deea,stroke:#333,color:#000
    style NEUROINFLAMMATION fill:#4fc3f7,stroke:#333,color:#000
    style MICROGLIA fill:#80deea,stroke:#333,color:#000
    style MITOPHAGY fill:#4fc3f7,stroke:#333,color:#000
    style FRONTAL_CORTEX fill:#b39ddb,stroke:#333,color:#000
    style NLRP3_INFLAMMASOME fill:#81c784,stroke:#333,color:#000
    style HIPPOCAMPUS fill:#b39ddb,stroke:#333,color:#000
    style CORTEX fill:#b39ddb,stroke:#333,color:#000
    style VORINOSTAT fill:#ff8a65,stroke:#333,color:#000
    style TREM2_APOE_axis fill:#ce93d8,stroke:#333,color:#000