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Eicosatrienoic Acid – Definition & Function

Eicosatrienoic acid is a polyunsaturated fatty acid with 20 carbon atoms and three double bonds, playing an important role in human metabolism and inflammatory regulation.

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Things worth knowing about "Eicosatrienoic acid"

Eicosatrienoic acid is a polyunsaturated fatty acid with 20 carbon atoms and three double bonds, playing an important role in human metabolism and inflammatory regulation.

What is Eicosatrienoic Acid?

Eicosatrienoic acid refers to a group of fatty acids with 20 carbon atoms and three double bonds in their molecular structure. The name derives from Greek: eikosi (twenty), tri (three), en (double bond), and oic acid denoting the carboxylic acid group. Depending on the position and configuration of the double bonds, several isomers exist, each with distinct biological properties.

The most clinically relevant forms include Mead acid (5,8,11-eicosatrienoic acid; 20:3n-9) and dihomo-gamma-linolenic acid (DGLA; 20:3n-6), as well as the omega-3 isomer 20:3n-3.

Biochemical Classification

Fatty acids are classified by the number of carbon atoms, the number of double bonds, and the position of those double bonds. Eicosatrienoic acids belong to the group of polyunsaturated fatty acids (PUFAs). Key isomers include:

20:3n-9 (Mead acid): Synthesized endogenously from oleic acid (18:1n-9) when dietary essential fatty acids are insufficient. Elevated Mead acid levels serve as a recognized biomarker for essential fatty acid deficiency.
20:3n-6 (DGLA, dihomo-gamma-linolenic acid): Derived from gamma-linolenic acid (GLA) and serves as a precursor for anti-inflammatory series-1 eicosanoids.
20:3n-3: An intermediate formed from alpha-linolenic acid on the metabolic pathway toward longer-chain omega-3 fatty acids such as EPA and DHA.

Biological Functions

The different isomers of eicosatrienoic acid serve distinct physiological roles:

Mead Acid (20:3n-9)

Mead acid is incorporated into cell membranes as a structural substitute when essential fatty acids are lacking in the diet. However, it cannot fully replicate the functional roles of essential fatty acids. An elevated ratio of Mead acid to arachidonic acid (the triene/tetraene ratio > 0.2) is a clinically accepted diagnostic marker for essential fatty acid deficiency.

Dihomo-Gamma-Linolenic Acid (DGLA, 20:3n-6)

DGLA is a key precursor in the biosynthesis of series-1 prostaglandins (e.g., PGE1), which exert anti-inflammatory and vasodilatory effects. Through the enzyme delta-5-desaturase, DGLA can also be converted to arachidonic acid (20:4n-6), a precursor of pro-inflammatory eicosanoids. The balance between these pathways significantly influences the degree of inflammation in the body.

Dietary Sources and Metabolism

Eicosatrienoic acids occur in small amounts in animal-derived foods. DGLA is found in human breast milk and certain animal fats. In human metabolism, most eicosatrienoic acids are produced through enzymatic elongation and desaturation of shorter-chain precursor fatty acids such as linoleic acid, alpha-linolenic acid, and gamma-linolenic acid.

Certain plant oils and specialty supplements -- such as evening primrose oil or borage oil as GLA sources -- can indirectly raise DGLA levels in the body.

Clinical Relevance

The measurement of eicosatrienoic acids, particularly Mead acid, has diagnostic significance in clinical practice:

Essential fatty acid deficiency: Elevated Mead acid levels are observed in patients with malabsorption syndromes, prolonged fat-free parenteral nutrition, or severe malnutrition.
Inflammatory conditions: The ratio of DGLA to arachidonic acid and the activity of delta-5-desaturase are relevant in chronic inflammatory diseases such as rheumatoid arthritis and atopic conditions.
Cardiovascular health: Prostaglandins derived from DGLA may contribute to vasodilation and inhibition of platelet aggregation, supporting cardiovascular well-being.

References

Sprecher, H. (2000). Metabolism of highly unsaturated n-3 and n-6 fatty acids. Biochimica et Biophysica Acta, 1486(2-3), 219-231.
Cunnane, S.C. (2003). Problems with essential fatty acids: time for a new paradigm? Progress in Lipid Research, 42(6), 544-568.
World Health Organization (WHO) / Food and Agriculture Organization (FAO): Fats and fatty acids in human nutrition. Report of an expert consultation. FAO Food and Nutrition Paper 91. Geneva, 2010.

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