Characterization of circadian human facial surface lipid composition

Abstract

Background The circadian rhythm is an endogenous clock that governs a wide range of physiological functions. In the skin, rhythmic changes in skin barrier function have been investigated at the physiological level; however, few studies at the molecular level have been reported. Additionally, there is no study on lipidomic profile variations of skin surface lipid (SSL), which could potentially explain the rhythmic changes in skin status. Objectives The SSL profile of healthy young women was analysed to assess SSL variations and to assess the skin status during the circadian cycle. Methods Ultra performance liquid chromatography/quadrupole time‐of‐flight mass spectrometry and multivariate data analysis were performed to assess SSL variations. Results The lipidomic profile showed significant differences with the circadian rhythm. Multivariate data analysis indicated that glycerolipids were the lipids majorly affected by the circadian rhythm. Additionally, in the SSL profile, both the average chain length and the content of free fatty acids (FFAs) were higher at 20:00 than at 08:00. Conclusions The SSL profile significantly varied with respect to the circadian rhythm. The rhythm‐altered triacylglycerol level, FFA chain length and FFA content resulted in rhythmic changes in skin barrier function, including transepidermal water loss alteration and pH variation.

Lipidomic analysis of facial skin surface lipids reveals an altered lipid profile in infant acne

“…1); high levels of unsaturated FFAs may cause barrier disorders and are associated with inflammation and with thickening of the follicle stem cells in acne. 7 These results are also consistent with our previous work showing that ceramide chains are shorter and levels of unsaturated FFAs are higher in young men with acne than in young men without acne. 2 However, surprisingly, we found that relative ceramide levels in patients with IA were higher than those in patients without IA (Fig.…”

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