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Date: 16-12-2021
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Date: 15-12-2021
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Histamine
Histamine is a chemical messenger that mediates a wide range of cellular responses, including allergic and inflammatory reactions and gastric acid secretion. A powerful vasodilator, histamine is formed by decarboxylation of histidine in a reaction requiring PLP (Fig. 1). It is secreted by mast cells as a result of allergic reactions or trauma. Histamine has no clinical applications, but agents that interfere with the action of histamine have important therapeutic applications.
Figure 1: Biosynthesis of histamine. PLP = pyridoxal phosphate.
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