Browsing by Subject "mast cell degranulation"

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    Synthetic Allergen Design Reveals The Significance of Moderate Affinity Epitopes in Mast Cell Degranulation
    (ACS, 2012) Handlogten, Michael W.; Kiziltepe, Tanyel; Alves, Nathan J.; Bilgicer, Basar
    This study describes the design of a well-defined homotetravalent synthetic allergen (HTA) system to investigate the effect of hapten–IgE interactions on mast cell degranulation. A library of DNP variants with varying affinities for IgEDNP was generated (Kd from 8.1 nM to 9.2 μM), and 8 HTAs spanning this range were synthesized via conjugation of each DNP variant to the tetravalent scaffold. HTAs with hapten Kd < 235 nM stimulated degranulation following a bell-shaped dose response curve with maximum response occurring near the hapten Kd. HTAs with hapten Kd ≥ 235 nM failed to stimulate degranulation. To mimic physiological conditions, the percent of allergen specific IgE on cell surface was varied, and maximum degranulation occurred at 25% IgEDNP. These results demonstrated that moderate hapten–IgE affinities are sufficient to trigger mast cell degranulation. Moreover, this study established the HTA design as a well-defined, controllable, and physiologically relevant experimental system to elucidate the mast cell degranulation mechanism.