Mast cell degranulation pathways

Mast cell degranulation pathways are the intracellular signaling sequences that trigger the explosive release of inflammatory mediators from mast cells. The most prominent pathway is the IgE-mediated cascade, initiated by the cross-linking of the high-affinity IgE receptor (FcεRI) by multivalent allergens, which recruits and activates tyrosine kinases such as Lyn and Syk [1.1.4, 1.4.4]. This leads to phospholipase C gamma (PLCγ) activation, calcium mobilization, and the fusion of secretory granules with the plasma membrane to release histamine, proteases, and cytokines [1.1.5, 1.4.2]. Alternative IgE-independent pathways involve receptors like MRGPRX2, KIT (CD117), and various G protein-coupled receptors, which can be triggered by neuropeptides, drugs, or physical stimuli [1.3.2, 1.5.1]. These pathways are critical in the pathophysiology of allergic rhinitis, asthma, anaphylaxis, and mast cell activation syndromes [1.1.1, 1.3.1]. Pharmacological intervention focuses on stabilizing mast cells (e.g., cromolyn), neutralizing IgE (e.g., omalizumab), or inhibiting key signaling enzymes like KIT and BTK [1.3.1, 1.3.3].

Other names

Mast cell activation pathwaysIgE-mediated degranulationNon-IgE-mediated degranulationMast cell secretory pathwaysMast cell activation

Mast cell stabilization, IgE neutralization, Tyrosine kinase inhibition, KIT inhibition, BTK inhibition, FcεRI signaling blockade