cell
CD8 Cytotoxic T Cell
Antigen-specific killing cell for viral control, tumor surveillance, memory, and exhaustion biology
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.
Provenance layer
External context
Curated external IDs add pathway and protein context around Atlas content. They do not update the graph automatically and they are not patient-specific interpretation.
State signature
Systems profile
System effects
Primary mapped axes from existing Atlas data.
Chronicity
Memory, priming, fibrosis, exhaustion, remodeling, or other time-dependent drift.
Tissue
Organ, barrier, stromal, vascular, or local niche behavior.
Metabolism
Energy allocation, glycolysis, mitochondrial strain, lipid signaling, or nutrient-sensitive behavior.
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.
Selected relationship
Cytotoxic T cells produce IFN-gamma during antiviral and tumor responses
Read as source produces or releases the target signal.
What this relationship means
Read this as output: CD8 Cytotoxic T Cell can release IFN-gamma, which then carries the next part of the signal.
Effect of source
CD8 Cytotoxic T Cell is the producing cell or node.
Effect on target
IFN-gamma is the released mediator to follow downstream.
Use with caution
Release edges show possible biology, not measured patient levels.
System effect
CD8 Cytotoxic T Cell releases IFN-gamma; 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.
Interferon gamma signaling
R-HSA-877300 - checked 2026-06-28
Graph neighborhood
Direct relationships
Arrow shows upstream source toward receiving target.
Cytotoxic T cells produce IFN-gamma during antiviral and tumor responses
Context link: no causal arrow.
CD8 T cells execute cytotoxic containment and can enter exhaustion under chronic antigen load
Network behavior
Systems Overview
CD8 T cells recognize peptide-MHC I and kill infected or transformed cells through perforin, granzymes, cytokines, and death-receptor pathways.
Lineage
Origin
HSC -> lymphoid progenitor -> thymocyte -> CD8 T cell -> effector, memory, tissue-resident, or exhausted CD8 state
Transcription factors: T-bet, Eomes, RUNX3, TCF1, TOX
Lifecycle Visualizer
days
Priming
Antigen and costimulation
days-weeks
Effector killing
Cytotoxic expansion
weeks
Memory selection
Long-lived recall pool
weeks-years
Exhaustion adaptation
Chronic antigen restraint
Activation and Suppression
Surface and Secreted Signals
Metabolic State
Programs
Acute: Effector CD8 cells expand rapidly and kill target cells.
Chronic: Persistent antigen drives checkpoint expression, TOX programs, mitochondrial strain, and exhaustion.
Tissue Roles
gut: Viral and intracellular pathogen defense with tissue injury risk.
lung: Respiratory viral clearance and resident memory.
skin: Resident memory and cytotoxic autoimmune dermatitis patterns.
CNS: Can control infection but also contribute to neuroinflammatory injury.
lymphoid: Priming and memory selection.
Disease Associations
Clinical Pearls
- CD8 cells are the core antigen-specific killing layer.
- Checkpoint expression can mean active adaptation to chronic antigen, not simply failure.
- Tumors often suppress CD8 function through antigen loss, checkpoints, Tregs, and nutrient competition.