Atlas One · Host Biology · Scale 03 — Molecular

IgE

IgE is the lowest-abundance but highest-affinity immunoglobulin; allergen-specific IgE binds FcεRI on mast cells → cross-linking by allergen → degranulation → histamine, leukotrienes, and PGD2; omalizumab (anti-IgE) reduces severe allergic asthma exacerbations and anaphylaxis.

Also known as: IgE, immunoglobulin E, IGHE, FcεRI, FcεRII, CD23, omalizumab, anti-IgE, allergic sensitization, atopic, anaphylaxis

Scale 03 — MolecularScale
draftStatus
2026-06-07Last Reviewed
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ige

IgE

IgE is the lowest-abundance but highest-affinity immunoglobulin; allergen-specific IgE binds FcεRI on mast cells → cross-linking by allergen → degranulation → histamine, leukotrienes, and PGD2; omalizumab (anti-IgE) reduces severe allergic asthma exacerbations and anaphylaxis.