cell
Innate Lymphoid Cell
Tissue-resident innate lymphocyte family that mirrors helper T-cell programs without antigen-specific receptors
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
Graph neighborhood
Direct relationships
IL-33 activates ILC2-type barrier responses with IL-5, IL-13, and amphiregulin output
ILC2 programs can produce IL-13 during alarmin-rich allergic and repair states
Network behavior
Systems Overview
Innate lymphoid cells sense epithelial and cytokine cues and rapidly produce type 1, type 2, or type 3 cytokines, shaping barrier defense, allergy, repair, and mucosal ecology.
Lineage
Origin
HSC -> common lymphoid progenitor -> innate lymphoid progenitor -> ILC1, ILC2, ILC3, or NK-like states
Transcription factors: ID2, T-bet, GATA3, RORγt, PLZF
Lifecycle Visualizer
weeks
ILC commitment
Innate lymphoid fate
developmental-weeks
Tissue seeding
Barrier-resident niche
hours
Rapid activation
Cytokine release
days-weeks
Plasticity or resolution
Context-dependent ILC state shift
Activation and Suppression
Surface and Secreted Signals
Metabolic State
Programs
Acute: Barrier cytokines rapidly trigger cytokine release without antigen-specific priming.
Chronic: Persistent alarmins or dysbiosis can keep ILC programs active and remodel tissue.
Tissue Roles
gut: ILC3 IL-22 supports barrier integrity; dysregulation can amplify inflammation.
lung: ILC2 produces IL-5/IL-13 during alarmin-rich allergy or repair responses.
skin: Supports barrier defense, itch/type 2 loops, and repair.
adipose: ILC2-like programs can support type 2 metabolic homeostasis.
lymphoid: Participates in tissue organization and barrier immune tone.
Disease Associations
Clinical Pearls
- ILCs are the fast tissue version of helper logic: TH1-like, TH2-like, or TH17-like without TCR specificity.
- ILC2s help explain allergy and repair before adaptive memory fully enters the loop.
- ILC3s link microbiome and epithelial IL-22 biology to barrier resilience.