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Spleen Tyrosine Kinase Recruitment to Fc Epsilon RI Gamma Subunit

Molecular classification: Signal Transduction Pathway, Protein-Protein Interaction

Overview

Spleen tyrosine kinase (SYK) recruitment to the Fc epsilon RI (FcεRI) gamma subunit is a critical step in mast cell and basophil activation following allergen exposure. Allergen-induced crosslinking of IgE bound to FcεRI leads to LYN-mediated phosphorylation of ITAMs on the γ subunits. These phosphorylated ITAMs then serve as docking sites for SYK, initiating downstream signaling cascades that result in degranulation and cytokine release. This pathway is central to allergic reactions.

Mechanism of action

SYK inhibitors block SYK kinase activity, preventing downstream signaling cascades.

Biological functions

Immune responseSignal transductionMast cell activationBasophil activation

Disease associations

Allergic diseasesInflammationAnaphylaxis

Interacting drugs

SYK inhibitors (e.g., Fostamatinib)

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