10-oxo-12(Z)-Octadecenoic acid is a metabolite of linoleic acid and an activator of transient receptor potential vanilloid 1 (TRPV1).^1,2It is formed from linoleic acid by conjugated linoleic acid dehydrogenase (CLA-DH)viaa 10-hydroxy-12(Z)-octadecenoic acid intermediate and can also be produced from linoleic acid by gut microbiota.¹10-oxo-12(Z)-Octadecenoic acid (100 µM) selectively increases calcium levels in HEK293 cells expressing TRPV1 over those expressing TRPV2, TRPV3, TRPV4, and TRP melastatin 8 (TRPM8).²It also induces inward currents in HEK293 cells expressing TRPV1, an effect that can be blocked by the TRPV1 antagonist capsazepine . Dietary administration of 10-oxo-12(Z)-octadecenoic acid (0.1% w/w) reduces weight gain and adipose tissue weight and increases the expression of the gene encoding mitochondrial uncoupling protein 1 (Ucp1) in wild-type, but notTrpv1knockout, mice fed a high-fat diet. It also decreases plasma glucose and triglyceride levels in diabetic KKAy mice fed a high-fat diet.

1.Kishino, S., Takeuchi, M., Park, S.-B., et al.Polyunsaturated fatty acid saturation by gut lactic acid bacteria affecting host lipid compositionProc. Natl. Acad. Sci. USA110(44)17808-17813(2013) 2.Kim, M., Furuzono, T., Yamakuni, K., et al.10-oxo-12(Z)-octadecenoic acid, a linoleic acid metabolite produced by gut lactic acid bacteria, enhances energy metabolism by activation of TRPV1FASEB J.3(11)5036-5048(2017)