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The Effect of UVB Irradiation and Oxidative Stress on the Skin Barrier: A New Method to Evaluate Sun Protection Factor Based on Electrical Impedance Spectroscopy
Malmö universitet, Fakulteten för hälsa och samhälle (HS), Institutionen för biomedicinsk vetenskap (BMV). Malmö universitet, Biofilms Research Center for Biointerfaces. Department of Pharmacy, Universidad Nacional de Colombia, Bogota 1101, Colombia.
Malmö universitet, Fakulteten för hälsa och samhälle (HS), Institutionen för biomedicinsk vetenskap (BMV). Malmö universitet, Biofilms Research Center for Biointerfaces.ORCID-id: 0000-0003-0304-7528
Malmö universitet, Fakulteten för hälsa och samhälle (HS), Institutionen för biomedicinsk vetenskap (BMV). Malmö universitet, Biofilms Research Center for Biointerfaces.ORCID-id: 0000-0001-6254-8539
2019 (Engelska)Ingår i: Sensors, E-ISSN 1424-8220, Vol. 19, nr 10, artikel-id 2376Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Sunlight is vital for several biochemical processes of the skin organ. However, acute or chronic exposure to ultraviolet radiation (UVR) has several harmful effects on the skin structure and function, especially in the case of the failing function of antioxidative enzymes, which may lead to substantial tissue damage due to the increased presence of reactive oxygen species (ROS). The aim of this work was to investigate the combined effect of ultraviolet B (UVB) irradiation and oxidative stress on the skin barrier integrity. For this, we employed electrical impedance spectroscopy (EIS) to characterize changes of the electrical properties of excised pig skin membranes after various exposure conditions of UVB irradiation, oxidative stress, and the inhibition of antioxidative enzymatic processes. The oxidative stress was regulated by adding hydrogen peroxide (HO) as a source of ROS, while sodium azide (NaN) was used as an inhibitor of the antioxidative enzyme catalase, which is naturally present throughout the epidermis. By screening for the combined effect of UVB and oxidative stress on the skin membrane electrical properties, we developed a new protocol for evaluating these parameters in a simple in vitro setup. Strikingly, the results show that exposure to extreme UVB irradiation does not affect the skin membrane resistance, implying that the skin barrier remains macroscopically intact. Likewise, exposure to only oxidative stress conditions, without UVB irradiation, does not affect the skin membrane resistance. In contrast to these observations, the combination of UVB irradiation and oxidative stress conditions results in a drastic decrease of the skin membrane resistance, indicating that the integrity of the skin barrier is compromised. Further, the skin membrane effective capacitance remained more or less unaffected by UVB exposure, irrespective of simultaneous exposure of oxidative stress. The EIS results were concluded to be associated with clear signs of macroscopic tissue damage of the epidermis as visualized with microscopy after exposure to UVB irradiation under oxidative stress conditions. Finally, the novel methodology was tested by performing an assessment of cosmetic sunscreen formulations with varying sun protection factor (SPF), with an overall successful outcome, showing good correlation between SPF value and protection capacity in terms of skin resistance change. The results from this study allow for the development of new skin sensors based on EIS for the detection of skin tissue damage from exposure to UVB irradiation and oxidative stress and provide a new, more comprehensive methodology, taking into account both the influence of UVB irradiation and oxidative stress, for in vitro determination of SPF in cosmetic formulations.

Ort, förlag, år, upplaga, sidor
MDPI, 2019. Vol. 19, nr 10, artikel-id 2376
Nyckelord [en]
UVB irradiation, azide, catalase, cosmetic sunscreen, epidermis, hydrogen peroxide, oxidative stress, stratum corneum, sun protection factor
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:mau:diva-4814DOI: 10.3390/s19102376ISI: 000471014500163PubMedID: 31126113Scopus ID: 2-s2.0-85066937244Lokalt ID: 29612OAI: oai:DiVA.org:mau-4814DiVA, id: diva2:1401648
Tillgänglig från: 2020-02-28 Skapad: 2020-02-28 Senast uppdaterad: 2024-03-27Bibliografiskt granskad

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Ruzgas, TautgirdasBjörklund, Sebastian

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