Dihomo-γ-linolenic acid

Dihomo-γ-linolenic acid
Names

Other names cis,cis,cis-8,11,14-Eicosatrienoic acid DGLA
Identifiers
CAS Number	1783-84-2
3D model (Jmol)	(canonical): Interactive image (isomeric): Interactive image
ChemSpider	4444199
ECHA InfoCard	100.015.667
PubChem CID	5280581
UNII	FC398RK06S^Y
InChI InChI=1S/C20H34O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20(21)22/h6-7,9-10,12-13H,2-5,8,11,14-19H2,1H3,(H,21,22)/b7-6-,10-9-,13-12- Key: HOBAELRKJCKHQD-QNEBEIHSSA-N InChI=1/C20H34O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20(21)22/h6-7,9-10,12-13H,2-5,8,11,14-19H2,1H3,(H,21,22)/b7-6-,10-9-,13-12- Key: HOBAELRKJCKHQD-QNEBEIHSBE
SMILES (canonical): CCCCCC=CCC=CCC=CCCCCCCC(=O)O (isomeric): CCCCC\C=C/C\C=C/C\C=C/CCCCCCC(=O)O
Properties
Chemical formula	C₂₀H₃₄O₂
Molar mass	306.49 g·mol⁻¹
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y (what is ^YN ?)
Infobox references

Dihomo-γ-linolenic acid (DGLA) is a 20-carbon ω−6 fatty acid. In physiological literature, it is given the name 20:3 (ω−6). DGLA is a carboxylic acid with a 20-carbon chain and three cis double bonds; the first double bond is located at the sixth carbon from the omega end. DGLA is the elongation product of γ-linolenic acid (GLA; 18:3, ω−6). GLA, in turn, is a desaturation product (Delta 6 desaturase) of linoleic acid (18:2, ω−6). DGLA is made in the body by the elongation of GLA, by an efficient enzyme which does not appear to suffer any form of (dietary) inhibition. DGLA is an extremely uncommon fatty acid, found only in trace amounts in animal products. DGLA production from GLA is enhanced when high levels of alpha-linolenic acid are present, blocking the arachidonic acid pathway.

The eicosanoid metabolites of DGLA are:

All of these effects are anti-inflammatory. This is in marked contrast with the analogous metabolites of arachidonic acid (AA), which are the series-2 thromboxanes and prostanoids and the series-4 leukotrienes. In addition to yielding anti-inflammatory eicosanoids, DGLA competes with AA for COX and lipoxygenase, inhibiting the production of AA's eicosanoids.

Taken orally in a small study, DGLA produced antithrombotic effects. Supplementing dietary GLA increases serum DGLA, as well as serum AA levels. Cosupplementation with GLA and EPA lowers serum AA levels by blocking Δ-5-desaturase activity, while also lowering leukotriene synthesis in neutrophils.

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