Perspectives in the Molecular Mechanisms Underlying Anaphylaxis.

Area of Science:

• Immunology
• Molecular Biology
• Pathophysiology

Background:

• Anaphylaxis presents complex clinical features and etiology, hindering precise endotype-phenotype correlation.
• While IgE-mediated mast cell and basophil activation is classical, other pathways are increasingly recognized.

Purpose of the Study:

• To elucidate the intricate cellular and molecular mechanisms underlying anaphylactic reactions.
• To explore emerging signaling pathways beyond classical IgE-mediated responses.

Main Methods:

• Review of current literature on anaphylaxis pathophysiology.
• Analysis of signaling pathways including IgG, complement, cyclooxygenase, MRGPRX2, and coagulation systems.
• Investigation of endothelial involvement, extracellular vesicles, microRNAs, and genetic factors.

Main Results:

• Anaphylaxis involves diverse mechanisms: IgE-mediated, IgG-associated neutrophil activation, complement, cyclooxygenase, MRGPRX2, and coagulation systems.
• Endothelial dysfunction, altered homeostasis, extracellular vesicle, and microRNA communication are implicated.
• Hereditary a-tryptasemia is linked to severe reactions.

Conclusions:

• Recognizing diverse cellular and molecular signaling mechanisms is crucial for advancing anaphylaxis research.
• This understanding will facilitate improved patient phenotyping and clinical management strategies.