Human heart mast cells in anaphylaxis and cardiovascular disease

International Archives of Allergy and Immunology
G MaroneM Adt

Abstract

All sections of human heart tissue demonstrate tryptase- and chymase-containing mast cells (HHMCs) which have for the first time been isolated, partially purified and studied in vitro. HHMCs contain similar histamine levels as lung and skin mast cells, but tryptase levels are lower than in skin and higher than in lung mast cells. Complement C5a causes rapid dose-dependent release of histamine from HHMCs, but they are refractory to substance P and fMLP. Cross-linking IgE receptors on HHMCs leads to arachidonic acid metabolism through both the cyclooxygenase and 5-lipoxygenase pathways. HHMCs and their vasoactive mediators may be involved in anaphylactic/anaphylactoid reactions in humans and in the pathogenesis of some cardiovascular diseases.

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