cell
Microglia
CNS-resident macrophage lineage controlling synapses, injury response, sickness signaling, and neuroinflammation
Review layer
Last reviewed 2026-05-17
Systems teaching draft. Content is structured for education and graph expansion, with formal source tagging ready for the next review pass.
State signature
Systems profile
System effects
Primary mapped axes from existing Atlas data.
Tissue
Organ, barrier, stromal, vascular, or local niche behavior.
Inflammation
Inflammatory alarm, recruitment, mediator release, or tissue-damaging amplification.
Neuroimmune
Nerve, neuropeptide, autonomic, microglial, pain, itch, fatigue, or sickness-behavior coupling.
No direct axis cue is mapped for this node yet.
Local map
Relationship field
Arrows point from the upstream source toward the receiving target. Restraint edges use a bar; association edges stay dashed because they are not causal arrows.
CNS danger sensing and sickness signaling
Read as source produces or releases the target signal.
What this relationship means
Read this as output: Microglia can release IL-1beta, which then carries the next part of the signal.
Effect of source
Microglia is the producing cell or node.
Effect on target
IL-1beta is the released mediator to follow downstream.
Use with caution
Release edges show possible biology, not measured patient levels.
System effect
Microglia releases IL-1beta; the mapped axes are inherited mainly from the released signal.
Inflammation
Inflammatory alarm, recruitment, mediator release, or tissue-damaging amplification.
Tissue
Organ, barrier, stromal, vascular, or local niche behavior.
Metabolism
Energy allocation, glycolysis, mitochondrial strain, lipid signaling, or nutrient-sensitive behavior.
Axes are mapped cues from Atlas data, not clinical predictions.
Evidence context
Curated edge, reviewed endpoints, and mapped external anchors.
Interleukin-1 signaling
R-HSA-9020702 - checked 2026-06-28
Graph neighborhood
Direct relationships
Arrow shows upstream source toward receiving target.
CNS danger sensing and sickness signaling
Context link: no causal arrow.
Primary CNS-resident immune cell
Network behavior
Systems Overview
Microglia maintain neural tissue, prune synapses, sense infection or injury, and adopt states that range from homeostatic surveillance to inflammatory, repair, or degenerative programs.
Lineage
Origin
Yolk-sac-derived macrophage lineage seeded into the CNS during development
Transcription factors: PU.1, IRF8, SALL1, MEF2C
Lifecycle Visualizer
embryonic
Developmental seeding
CNS niche occupation
lifelong
Homeostatic surveillance
Process motility and synapse monitoring
hours-days
Activated transition
Debris and cytokine response
weeks-years
Primed state
Lowered threshold in aging or chronic inflammation
Activation and Suppression
Surface and Secreted Signals
Metabolic State
Programs
Acute: Rapid sensing of ATP, debris, and cytokines shifts motility and inflammatory output.
Chronic: Persistent debris, aging, and systemic inflammation can create primed or disease-associated states.
Tissue Roles
CNS: Synaptic pruning, debris clearance, immune surveillance, repair, and neuroinflammatory amplification.
gut: Indirectly shaped by microbial metabolites and vagal/systemic inflammatory signals.
vasculature: Interacts with barrier cells and perivascular macrophage compartments.
Disease Associations
Clinical Pearls
- Microglial activation is a state spectrum, not a single on/off switch.
- Peripheral inflammation can be felt centrally through cytokines, barrier signaling, and neural afferents.
- Sleep is a major neuroimmune regulator because clearance and inflammatory thresholds change over time.