3 years ago

The Phototoxic Potential of the Flavonoids, Taxifolin and Quercetin

The Phototoxic Potential of the Flavonoids, Taxifolin and Quercetin
Jitka Vostálová, Alena Ryšavá, Pavel Kosina, Alena Rajnochová Svobodová, Bohumil Zálešák, Jitka Ulrichová, Michaela Psotová
Quercetin, one of the most abundant polyphenols in the plant kingdom has been shown to be photodegraded on exposure to UV light. Despite the fact, it is a component of several dermatological preparations. Its phototoxic potential has not been evaluated to date. The aim of this study was to assess whether photo-induced degradation of quercetin is linked to phototoxic effects on living cells. Its dihydro derivative, taxifolin, was included in the study. For evaluation, the 3T3 Neutral Red Uptake Phototoxicity Test according to OECD TG 432 was used. To better approximate human skin, HaCaT keratinocytes, normal human epidermal keratinocytes and dermal fibroblasts were used, apart from the Balb/c 3T3 cell line. Quercetin showed a dose-dependent photodegradation in aqueous and organic environments and a phototoxic effect on all used cells. Quercetin pretreatment and following UVA exposure resulted in increased reactive oxygen species production and intracellular glutathione level depletion in human dermal fibroblasts. Taxifolin was found completely nonphototoxic and photostable. As only in vitro methodology was used, further studies using 3D skin models and/or human volunteers are needed to confirm whether exposure to sunlight, tanning sunbeds and/or phototherapy in people using cosmetics containing quercetin is a health risk. Quercetin and its dihydro derivative taxifolin were tested for their photostability and phototoxicity. Quercetin showed a dose-dependent photo-degradation in aqueous and organic environments and a phototoxic effect on Balb/c 3T3 fibroblasts, HaCaT keratinocytes, normal human epidermal keratinocytes and dermal fibroblasts. Taxifolin was found completely photostable and nonphototoxic on all used cells.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/php.12755

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