Mast Cells vs. Granulocytes: Lineage, Location, and Functional Distinctions
Classification
- Granulocytes (neutrophils, eosinophils, basophils) are bone marrow-derived, circulate in blood, and are short-lived. Their granules stain with Romanowsky dyes.
- Mast Cells are tissue-resident, long-lived cells. They originate from myeloid progenitors but mature in tissues (not in bone marrow). Their granules contain histamine, heparin, tryptase, chymase, and cytokines.
Key Differences
| Feature | Granulocytes | Mast Cells |
|---|---|---|
| Maturation Site | Bone marrow | Connective tissue / mucosa |
| Circulation | Yes (blood) | No (tissue-fixed) |
| Primary Trigger | Pathogen PAMPs, complement, cytokines | IgE-FcεRI crosslinking (allergy), complement, TLRs, neuropeptides |
| Key Role | Acute inflammation, phagocytosis (neutrophils), parasite defense (eosinophils) | Allergy, anaphylaxis, parasite expulsion, tissue remodeling, angiogenesis |
Mast cells are not granulocytes. Despite sharing granular content, they differ fundamentally in ontogeny, distribution, and activation biology.
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