Propolis Extracts Inhibit UV-Induced Photodamage in Human Experimental In Vitro Skin Models

• Published in: Antioxidants Vol. 8; no. 5; p. 125
• Main Authors: Karapetsas, Athanasios, Voulgaridou, Georgia-Persephoni, Konialis, Manolis, Tsochantaridis, Ilias, Kynigopoulos, Spyridon, Lambropoulou, Maria, Stavropoulou, Maria-Ioanna, Stathopoulou, Konstantina, Aligiannis, Nektarios, Bozidis, Petros, Goussia, Anna, Gardikis, Konstantinos, Panayiotidis, Mihalis I, Pappa, Aglaia
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 09-05-2019; MDPI
• Subjects: Acids; Aluminum; antiaging; antioxidant; Antioxidants; Carbonyl compounds; Cell viability; Collagen; Cytotoxicity; Deoxyribonucleic acid; DNA; DNA damage; Ethanol; Flavonoids; Free radicals; Geography; HaCaT; Interstitial collagenase; Matrix metalloproteinase; matrix metalloproteinases; Oxidation; Oxidative stress; Phenolic compounds; photoprotective; Propolis; Radiation; reconstituted skin; Skin; Ultraviolet radiation; Greece; Switzerland; reconstituted skin; antioxidant; DNA damage; photoprotective; propolis; antiaging; matrix metalloproteinases; HaCaT
• ISSN: 2076-3921; 2076-3921
• DOI: 10.3390/antiox8050125

The aim of this study was to assess the antioxidant, photoprotective, and antiaging effects of Greek propolis. Propolis was subjected to n-heptane or methanol extraction. Total phenolic/flavonoid content and antioxidant potential were determined in the extracts. Promising extracts were evaluated for their cytoprotective properties using human immortalized keratinocyte (HaCaT) or reconstituted human skin tissue following exposure to UVB. Assessment of cytotoxicity, DNA damage, oxidative status, and gene/protein expression levels of various matrix metalloproteinases (MMPs) were performed. The propolis methanolic fractions exhibited higher total phenolic and flavonoid contents and significant in vitro antioxidant activity. Incubation of HaCaT cells with certain methanolic extracts significantly decreased the formation of DNA strand breaks following exposure to UVB and attenuated UVB-induced decrease in cell viability. The extracts had no remarkable effect on the total antioxidant status, but significantly lowered total protein carbonyl content used as a marker for protein oxidation in HaCaT cells. MMP-1, -3, -7, and -9, monitored as endpoints of antiaging efficacy, were significantly reduced by propolis following UVB exposure in a model of reconstituted skin tissue. In conclusion, propolis protects against the oxidative and photodamaging effects of UVB and could be further explored as a promising agent for developing natural antiaging strategies.