15-Hydroxyeicosatetraenoic acid

A hydroxylated derivative of arachidonic acid

15-Hydroxyeicosatetraenoic acid (15-HETE) is a hydroxyeicosatetraenoic acid derived from arachidonic acid. It is an important eicosanoid involved in various physiological and pathological processes.

Biosynthesis

15-HETE is primarily synthesized through the action of the enzyme 15-lipoxygenase on arachidonic acid. This enzyme catalyzes the oxygenation of arachidonic acid to produce 15(S)-HETE, which is the predominant stereoisomer.

Biological functions

15-HETE plays a role in the regulation of inflammation, immune response, and vascular homeostasis. It can act as a signaling molecule, influencing the behavior of various cell types, including endothelial cells, smooth muscle cells, and leukocytes.

Role in inflammation

In the context of inflammation, 15-HETE can have both pro-inflammatory and anti-inflammatory effects, depending on the cellular context and the presence of other mediators. It is involved in the resolution phase of inflammation, promoting the clearance of inflammatory cells and the restoration of tissue homeostasis.

Role in vascular biology

15-HETE is involved in the regulation of vascular tone and blood pressure. It can modulate the contraction and relaxation of vascular smooth muscle cells, thereby influencing blood flow and pressure.

Pathophysiological implications

15-HETE has been implicated in various diseases, including asthma, atherosclerosis, and cancer. In asthma, it may contribute to airway inflammation and hyperresponsiveness. In atherosclerosis, 15-HETE can influence the development of atherosclerotic plaques by affecting the behavior of vascular cells and macrophages.

Metabolism

15-HETE can be further metabolized to other bioactive lipids, including lipoxins, which are involved in the resolution of inflammation. It can also be converted to 15-oxo-eicosatetraenoic acid, which has distinct biological activities.

Related pages

• Arachidonic acid
• Eicosanoid
• Lipoxygenase
• Inflammation

Gallery

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  Structure of 15(S)-HETE