12-Hydroxyeicosatetraenoic acid
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IUPAC name
(5Z,8Z,10E,12S,14Z)-12-Hydroxyicosa-5,8,10,14-tetraenoic acid
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| Other names
12-HETE; 12(S)-HETE
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3D model (Jmol)
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| Properties | |
| C20H32O3 | |
| Molar mass | 320.47 g·mol−1 |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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12-Hydroxyeicosatetraenoic acid (12-HETE) is a derivative of the 20 carbon polyunsaturated fatty acid, arachidonic acid, containing a Hydroxyl residue at carbon 12 and a 5Z,8Z,10E,14Z Cis–trans isomerism configuration (Z=cis, E=trans) in its four double bonds. It was first found as a product of arachidonic acid metabolism made by human and bovine platelets through their 12S-lipoxygenase (i.e. ALOX12) enzyme(s). However, the term 12-HETE is ambiquous in that it has been used to indicate not only the initially detected "S" stereoisomer, 12S-hydroxy-5Z,8Z,10E,14Z-eicosatetraenoic acid (12(S)-HETE or 12S-HETE), made by platelets, but also the later detected "R" stereoisomer, 12(R)-hydroxy-5Z,8Z,10E,14Z-eicosatetraenoic acid (also termed 12(R)-HETE or 12R-HETE) made by other tissues through their 12R-lipoxygenase enzyme, ALOX12B. The two isomers, either directly or after being further metabolized, have been suggested to be involved in a variety of human physiological and pathological reactions. Unlike hormones which are secreted by cells, travel in the circulation to alter the behavior of distant cells, and thereby act as Endocrine signalling agents, these arachidonic acid metabolites act locally as and/or Paracrine signaling agents to regulate the behavior of their cells of origin or of nearby cells, respectively. In these roles, they may amplify or dampen, expand or contract cellular and tissue responses to disturbances.
In humans, Arachidonate 12-lipoxygenase (12-LO, 12-LOX, ALO12, or platelet type 12-lipoxygenase) is encoded by the ALOX12 gene and expressed primarily in platelets and skin. ALOX12 metabolizes arachidonic acid almost exclusively to 12(S)-hydroperoxy-5Z,8Z,10E,14Z-eicosatetraenoic acid (12(S)-HpETE or 12S-HpETE).Arachidonate 15-lipoxygenase-1 (15-LO-1, 15-LOX-1, ALOX15), which is expressed in far more tissues that ALOX12, metabolizes arachidonic acid primarily to 15(S)-HpETE along with other metabolites of the 15-Hydroxyicosatetraenoic acid family; during this metabolism, however, ALOX15 also forms 12(S)-HpETE as a minor product. Arachidonate 12-lipoxygenase, 12R type, also termed 12RLOX and encoded by the ALOX12B gene, is expressed primarily in skin and cornea; it metabolizes arachidonic acid to 12(R)-HpETE. enzymes convert arachidonic acid to a variety of hydroperoxy, epoxy, and dihydroxy derivatives including racemic mixtures of 12(S)-HpETE and 12(R)-HpETE or 12(S)-HETE and 12(R)-HETE; the R stereoisomer predominates in these mixtures. The initial 12(S)-HpETE and 12(R)-HpETE products, regardless of their pathway of formation, are rapidly reduced to 12(S)-HETE and 12(R)-HETE, respectively, by ubiquitous cellular peroxidases, including in particular Glutathione peroxidases or, alternatively, are further metabolized as described below.
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