20-Hydroxyeicosatetraenoic acid

A metabolite of arachidonic acid

20-Hydroxyeicosatetraenoic acid (20-HETE) is a metabolite of arachidonic acid, an important polyunsaturated fatty acid in the human body. It is produced by the action of cytochrome P450 enzymes, specifically the CYP4A and CYP4F subfamilies. 20-HETE plays a significant role in the regulation of vascular tone, renal function, and blood pressure.

Biosynthesis

20-HETE is synthesized from arachidonic acid through the action of cytochrome P450 enzymes. These enzymes hydroxylate arachidonic acid at the omega-terminus, specifically at the 20th carbon, to produce 20-HETE. The CYP4A and CYP4F subfamilies are primarily responsible for this conversion.

Physiological roles

20-HETE is involved in various physiological processes:

• Vascular tone regulation: 20-HETE acts as a potent vasoconstrictor in the cerebral, renal, and coronary circulations. It modulates the activity of ion channels and smooth muscle contraction, influencing blood flow and pressure.

• Renal function: In the kidneys, 20-HETE regulates sodium and water excretion, affecting glomerular filtration rate and tubular reabsorption. It plays a role in renal autoregulation and blood pressure control.

• Inflammation and cell proliferation: 20-HETE has been implicated in inflammatory responses and cell proliferation, influencing processes such as angiogenesis and tumor growth.

Pathophysiological implications

Abnormal levels of 20-HETE have been associated with various diseases and conditions:

• Hypertension: Elevated 20-HETE levels have been linked to the development of hypertension, particularly in salt-sensitive individuals.

• Stroke and cardiovascular diseases: Due to its role in vascular tone regulation, 20-HETE is implicated in the pathogenesis of stroke and other cardiovascular diseases.

• Cancer: 20-HETE has been shown to promote tumor growth and metastasis in certain types of cancer, making it a potential target for therapeutic intervention.

Research and therapeutic potential

Research into 20-HETE is ongoing, with studies exploring its potential as a therapeutic target. Inhibitors of 20-HETE synthesis or action are being investigated for their potential to treat hypertension, stroke, and cancer.

Related pages

• Arachidonic acid
• Cytochrome P450
• Hypertension
• Renal function

Gallery

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  Chemical structure of 20-HETE