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J Pharmacol Sci. 2016 Sep;132(1):55-64. doi: 10.1016/j.jphs.2016.08.004. Epub 2016 Aug 12.

Protective and therapeutic effects of fucoxanthin against sunburn caused by UV irradiation.

Author information

1
Molecular Toxicology Lab., Ritsumeikan University, Shiga, Japan.
2
Infection Control Lab., Ritsumeikan University, Shiga, Japan.
3
Pharmacognosy Lab., Ritsumeikan University, Shiga, Japan.
4
Pharmacoinformatics Lab., Faculty of Pharmaceutical Sciences, Ritsumeikan University, Shiga, Japan.
5
Faculty of Sport & Health Sciences, Ritsumeikan University, Shiga, Japan.
6
Molecular Toxicology Lab., Ritsumeikan University, Shiga, Japan. Electronic address: fujitat@fc.ritsumei.ac.jp.

Abstract

Mild exposure to ultraviolet (UV) radiation is also harmful and hazardous to the skin and often causes a photosensitivity disorder accompanied by sunburn. To understand the action of UV on the skin we performed a microarray analysis to isolate UV-sensitive genes. We show here that UV irradiation promoted sunburn and downregulated filaggrin (Flg); fucoxanthin (FX) exerted a protective effect. In vitro analysis showed that UV irradiation of human dermal fibroblasts caused production of intracellular reactive oxygen species (ROS) without cellular toxicity. ROS production was diminished by N-acetylcysteine (NAC) or FX, but not by retinoic acid (RA). In vivo analysis showed that UV irradiation caused sunburn and Flg downregulation, and that FX, but not NAC, RA or clobetasol, exerted a protective effect. FX stimulated Flg promoter activity in a concentration-dependent manner. Flg promoter deletion and chromatin immunoprecipitation analysis showed that caudal type homeo box transcription factor 1 (Cdx1) was a key factor for Flg induction. Cdx1 was also downregulated in UV-exposed skin. Therefore, our data suggested that the protective effects of FX against UV-induced sunburn might be exerted by promotion of skin barrier formation through induction of Flg, unrelated to quenching of ROS or an RA-like action.

KEYWORDS:

Filaggrin; Fucoxanthin; Skin barrier; Sunburn

PMID:
27590588
DOI:
10.1016/j.jphs.2016.08.004
[Indexed for MEDLINE]
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