Tissues as immune ecosystems

Tolerance-dominant barrier system shaped by microbiome metabolites, epithelial alarmins, and antigen flux

Air-exposed barrier where epithelial alarmins, macrophage tone, and type 2 circuits regulate airway reactivity

Privileged but responsive neuroimmune compartment governed by microglia, barriers, and sickness signaling

Neurovascular barrier where keratinocytes, mast cells, sensory nerves, and resident memory cells shape itch and repair

Metabolic immune niche where nutrient excess, hypoxia, macrophages, and fibrosis reshape systemic inflammation

Portal immune filter balancing gut-derived tolerance, metabolic stress, acute phase response, and fibrosis

Endothelial interface controlling leukocyte trafficking, thromboinflammation, permeability, and systemic cytokine distribution

Organized decision architecture for antigen presentation, clonal selection, germinal centers, and memory formation

Primary hematopoietic niche where immune supply, plasma-cell survival, trained myeloid output, and inflammatory demand are coupled

Bone as an immune-active remodeling organ linking osteoclasts, osteoblasts, marrow niches, inflammation, sex hormones, and mineral metabolism

Blood-filtering immune organ coordinating encapsulated-bacteria defense, red-pulp macrophages, marginal-zone B cells, and systemic inflammatory surveillance

Tonsils, adenoids, Peyer's patches, and MALT as antigen-sampling hubs for IgA, tolerance, allergy, and barrier memory

Central tolerance and T-cell education organ where endocrine signals, epithelial niches, and selection thresholds shape the T-cell repertoire

Hormone-producing organs as immune-modulating tissues linking HPA tone, thyroid signaling, insulin biology, gonadal hormones, and inflammatory thresholds