This study examined how IgE sensitization of mast cells (MCs) — without triggering degranulation — affects the quantity, molecular composition, and function of released extracellular vesicles (EVs), using cultured MCs and human plasma EVs analyzed by proteomics, lipidomics, nanoparticle-tracking, flow cytometry, and immunoblotting.
IgE-sensitized MCs released EVs with distinct molecular signatures (vs. EVs from degranulated MCs) that carried surface-exposed IgE capable of binding antigen and transferring functional IgE complexes to naïve, unsensitized MCs, thereby conferring activation potential.
- Primarily in vitro and cell culture–based; direct in vivo evidence of IgE-EV–mediated sensitization spread is not established. - Human plasma EV findings are correlative; clinical significance and IgE-EV levels in allergic patients were not quantitatively defined. - Mechanistic details of how EVs transfer IgE to recipient MC membranes remain incompletely characterized.
IgE-carrying EVs from sensitized mast cells may represent a novel mechanism amplifying allergic sensitization beyond classical IgE production. Clinicians should watch for emerging research on IgE-EVs as potential biomarkers or therapeutic targets in allergic disease management.
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