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IgE Trimers Drive SPE-7 Cytokinergic Activity.

IgE Trimers Drive SPE-7 Cytokinergic Activity.
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Bax HJ, Bowen H, Beavil RL, Chung R, Ward M, Davies AM, Dodev TS, McDonnell JM, Beavil AJ, Sutton BJ, Gould HJ,


Bax HJ, Bowen H, Beavil RL, Chung R, Ward M, Davies AM, Dodev TS, McDonnell JM, Beavil AJ, Sutton BJ, Gould HJ, (click to view)

Bax HJ, Bowen H, Beavil RL, Chung R, Ward M, Davies AM, Dodev TS, McDonnell JM, Beavil AJ, Sutton BJ, Gould HJ,

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Scientific reports 2017 08 157(1) 8164 doi 10.1038/s41598-017-08212-6
Abstract

Degranulation of mast cells and basophils, with release of agents of the allergic response, ensues when multivalent antigens bind to and cross-link the cells’ receptor-bound IgE antibodies. A widely used commercial monoclonal IgE antibody, SPE-7 IgE from Sigma, was found to possess the radically anomalous property, termed "cytokinergic", of inducing basophil degranulation without the intervention of an antigen. We show here that the IgE monomer, freed of protein contaminants, is devoid of this activity, and that the source of the anomaly is a trace impurity, identified as a dissociation-resistant IgE trimer. Possible models for the formation of IgE trimers and the manner in which they cross-link cell surface receptors are suggested herein.

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