FULL SUPPLEMENT: Skin Barrier and Skin Health

April 2021 | Volume 20 | Issue 4 | Department | s1 | Copyright © April 2021


Published online April 8, 2021

et al al

Abstract
In this supplement:

Efficacy of Ceramide-Containing Formulations on UV-Induced Skin Surface Barrier Alterations
The human skin, particularly the stratum corneum, serves as a protective barrier against exogenous factors, including ultraviolet radiation (UVR) and pathogen invasions. The impact of UVR on skin cancer and photoaging has been extensively studied. However, the direct impact of UVR on skin barrier integrity under clinical settings remains poorly explored. Due to their benefits in reducing inflammation and promoting skin barrier repair, ceramide-containing formulations can provide added photoprotection benefits. In this study, the efficacy of a ceramide-containing sunscreen and moisturizer were evaluated in preventing UV-induced skin surface barrier changes. Expert grading, instrumental, and tape-stripping assessments demonstrated that UVR induced erythema and hyperpigmentation and caused changes in skin cells surface morphological organization and maturation. Treatment with a ceramide-containing sunscreen and moisturizing cream routine reduced erythema and hyperpigmentation, improved skin hydration, and maintained normal superficial skin cells morphology and turnover after UVR. Our results indicate that barrier-enforcing lipids formulations can provide additional benefits in patient’s daily routine by strengthening the barrier and improving skin health overall against chronic sun exposure.
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Alteration to the Skin Barrier Integrity Following Broad-Spectrum UV Exposure in an Ex Vivo Tissue Model

Dynamic changes to the skin barrier’s molecular structure and ceramide profile are well-documented in skin conditions such as atopic dermatitis and psoriasis. Pathological and environmental factors have been shown to impair barrier integrity and demonstrate shifts in ceramide composition in the skin. However, the relationship between acute and prolonged sun exposure and its effects on skin barrier homeostasis is insufficiently investigated. This study aims to uncover new scientific evidence to elucidate the relationship of UV irradiation with the skin barrier using an ex vivo tissue model following simulated UVA/UVB exposure. Fresh ex vivo human skin pretreated either with or without a broad-spectrum sunscreen was exposed to either a physiological or elevated UV condition. Following eight days in culture, structural and molecular changes were evaluated. UV irradiated skin displayed epidermal cell death and altered expression of key barrier proteins. TEM analysis demonstrated disruption to adherens junctions and dissociation between tissue layers following both physiological and extensive UV exposures. An effective broad-spectrum sunscreen containing essential skin ceramides completely protected the skin from such changes. This is one of the first works demonstrating a clear correlation of altered skin barrier integrity using a physiologically relevant dose in an ex vivo tissue model. Our findings also further support the additional importance and benefits of sun protection among the consumers.
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Compromised Skin Barrier and Sensitive Skin in Diverse Populations

The most important function of the stratum corneum (SC), the uppermost layer of the human epidermis, is the formation of the epidermal permeability barrier. Lipids, particularly ceramides, cholesterol, and free fatty acids, together form lamellar membranes in the extracellular spaces of the SC that limit the loss of water and electrolytes. In addition to preventing water and electrolyte loss, the SC as a permeability barrier prevents the entry of harmful irritants, allergens, and microorganisms into the skin. Disruption of the epidermal barrier leads to skin that is irritated, more reactive, and more sensitive than normal skin. SC thickness, lipid profile, and barrier function vary with different ethnic groups, which is also reflected the differences in prevalence and manifestation of diverse skin conditions related to the skin barrier function such as atopic dermatitis and sensitive skin. In addition to these compromised skin barrier related conditions, we are just now starting to understand the direct and indirect impact of COVID-19 on the skin and how current preventative measures are contributing to skin barrier disorders. Our understanding of various approaches for restoration of skin barrier, especially the role of topically applied mixtures of cholesterol, ceramides, and essential/nonessential free fatty acids (FFAs) allows for the strengthening of the compromised skin barrier and alleviation of symptoms and discomfort associated with skin barrier disorders. Ceramide containing products on the market are commonly available and offer protection and reparative benefits to the skin barrier.
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Models to Study Skin Lipids in Relation to the Barrier Function: A Modern Update on Models and Methodologies Evaluating Skin Barrier Function

The skin barrier is a multifaceted microenvironment, comprised not only of structural and molecular components that maintain its integrity, but also a lipid matrix comprising an equimolar ratio of cholesterol, free fatty acids, and ceramides. Lipid abnormalities induced by environmental or pathological stimuli are often associated with impaired skin barrier function and integrity. Incorporation of skin lipids in skincare formulations to help fortify barrier function has become widespread. While there are resources available to study the barrier, a comprehensive evaluation of skin models, from in situ to in vivo, that focus on alterations of the lipid content, seems to be lacking. This article reviews current methods to evaluate the skin lipid barrier and touches upon the significance of using such models within the cosmetic field to study formulations that incorporate barrier lipids.
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Evolution of Skin Barrier Science for Healthy and Compromised Skin

Background:
Laser and energy devices may be used for the treatment of facial aging signs. While previous investigators have evaluated methods of reducing risks of adverse events due to the treatment procedure itself, no algorithm exists on peri-procedure measures for laser and energy device treatment.
Methods: A panel of dermatologists and plastic surgeons was convened for a meeting to develop an algorithm for peri-procedure measures for facial laser and energy devices treatment. A modified Delphi technique was used to develop the algorithm, which was based on the best available evidence, the outcome of a previous survey on the subject coupled with the panelists’ experience and opinion. Results: The four sections of the algorithm address prevention, pre-procedure, during the procedure, and post-procedure measures. Prevention includes the avoidance of excessive sun exposure before and the use of a broad-spectrum sunscreen with an SPF 30 or higher. The panel recommends the use of oral antiviral prophylaxis for patients undergoing ablative laser treatments. Products for pre- and post-procedure management that combine bacterial, antiviral, and antifungal activity while stimulating wound healing offer benefits. When used after resurfacing, the use of such products is to be followed by the application of an emollient.
Conclusions: The algorithm was designed as a tool to support an optimal treatment outcome providing physicians with guidance to choose the best pre-/post-procedure measures for their patients.
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