5(s),6(s) dihete

5(S),6(S)-DiHETE is one of the four diastereomeric 5,6-dihydroxy acids produced from the non-enzymatic hydrolysis of LTA4. 5(S),6(S)-DiHETE does not have significant leukotriene-like activity.

5(S),6(R)-11-trans DiHETE is a C-11 double bond isomer of 5(S),6(R)-DiHETE that is formed by the enzymatic isomerization of 5(S),6(R)-DiHETE by a membrane bound factor. 5(S),6(R)-11-trans DiHETE has been found in rat kidney homogenates and is potentially formed by the epoxide hydrolase pathway in this tissue. The isomerase activity responsible for the conversion of leukotriene B4 (LTB4) to 6-trans LTB4 in rat kidney homogenates has also been implicated in its formation. 5(S),6(R)-11-trans DiHETE is not a substrate for soybean lipoxygenase. The biological activity of 5(S),6(R)-11-trans DiHETE has not been reported.

5(S),6(R)-DiHETE is a dihydroxy polyunsaturated fatty acid and a nonenzymatic hydrolysis product of leukotriene A4 (LTA4). Mouse liver cytosolic epoxide hydrolase catalyzes the conversion of LTA4 to 5(S),6(R)-DiHETE. It is a weak LTD4 receptor agonist in guinea pig lung membranes. It induces guinea pig ileum contraction with an ED50 value of 1.3 μM.