Influence of cosmetic formulations on the skin’s circadian clock

Young handsome caucasian man applying cream under the eyes. Caring face, metrosexual daily routine in the bathroom. Indoors, copy space.
Young handsome caucasian man applying cream under the eyes. Caring face, metrosexual daily routine in the bathroom. Indoors, copy space.

Source: Elena_AdobeStock.com

The skin has its own circadian biorhythm to gain full functionality. Interruption of this oscillation will lead to functional impairments. In a recent study Rahn AG shows a cosmetic solution to protect and preserve the skin’s circadian rhythm. DNA protection, ROS elimination and stimulation of circadian gene expression seems to be crucial to keep the skin in balance.

Objective

The circadian rhythm was set into focus by awarding the Nobel Price of Physiology/Medicine to Jeffrey Hall, Michael Rosbash and Michael Young in late 2017. Numerous publications elucidated the molecular mechanisms driving the circadian biorhythms of our body, peripheral organs and each single cell. However, there is minor knowledge on the circadian rhythm of the skin, which has its own peripheral circadian clock in contact with cosmetic formulations. The skin’s epidermal clock is excessively influenced by environmental factors like UV radiation or modern lifestyle, which may induce epidermal jetlag. Here, we give an overview on the current knowledge about the epidermal circadian clock and provide a cosmetic solution to protect and preserve the biorhythm of the skin.

Methods

Quantitative RT‐PCR to analyse the gene expression of circadian clock genes and the downstream DNA repair gene OGG1 in keratinocytes irradiated with UV‐B. In‐vivo study to determine skin parameters dependent on the circadian cycle and interference of cosmetic formulations to them by assessment of morning and evening values at each measurement day after 28, 56 and 84 days of the study.

Cosmetic active ingredient prevents formation of certain chemicals

UV‐B irradiation leads to a pronounced delay in circadian clock and downstream gene expression which interferes in the proper function of epidermal stem cells and as thus skin function. The use of a cosmetic active ingredient prevents cyclobutane pyrimidine dimer formation, protects epidermal stem cells and resets the circadian gene expression. It preserves the circadian changes in skin hydration, reduces daily fluctuations of skin redness and strengthens the skin barrier.

This study has been published in International Journal of Cosmetic Science

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