C18 Ceramide-d7 is intended for use as an internal standard for the quantification of C18 ceramide by GC- or LC-MS. C18 Ceramide is an endogenous bioactive sphingolipid. It is the primary short-chain ceramide found in brain tissue whose synthesis is regulated by longevity-assurance homologue 1 (Lass1) in mice.[1] Increased expression of C18 ceramide reduces cell growth in UM-SCC-22A squamous cell carcinoma cells.[2] It is selectively down-regulated in 32 human head and neck squamous cell carcinoma tumor tissues as compared to non-squamous tumor tissues. C18 Ceramide concentration is significantly higher in muscle tissue of type 2 diabetic patients compared with non-diabetic patients and is positively correlated to body mass index and inversely related to insulin sensitivity.[3]

Reference:
[1].Mizutani, Y., Kihara, A., and Igarashi, Y.Mammalian Lass6 and its related family members regulate synthesis of specific ceramidesBiochem J.390(Pt. 1)263-271(2005)
[2].Koybasi, S., Senkal, C.E., Sundararaj, K., et al.Defects in cell growth regulation by C18:0-ceramide and longevity assurance gene 1 in human head and neck squamous cell carcinomasJ. Biol. Chem.279(43)44311-44319(2004)
[3].Bergman, B.C., Brozinick, J.T., Strauss, A., et al.Muscle sphingolipids during rest and exercise: A C18:0 signature for insulin resistance in humansDiabetologia59(3)785-791(2016)