Autacoids DOWNLOAD [PDF] Introduction · histamine · serotonin · endogenous peptides · prostaglandins · leukotrienes Histamine and Antihistamines Histamine Synthesis Histamine: Storage and Release Immunologic Release: 1. The most important mechanism for histamine release is in response to an immunological stimulus. 2. In mast cells, if sensitized by surface IgE antibodies, degranulate when exposed specific antigen. 3. Degranulation means liberation of the contents of the mast cell granules, including .histamine 4. Degranulation is involved in the immediate (type I) allergic reaction....