J Nutr Health.  2016 Oct;49(5):269-276. 10.4163/jnh.2016.49.5.269.

Dietary effect of green tea extract on hydration improvement and metabolism of free amino acid generation in epidermis of UV-irradiated hairless mice

Affiliations
  • 1Department of Medical Nutrition, Graduate School of East-West Medical Science, Kyung Hee University, Yongin 17104, Korea. choyunhi@khu.ac.kr

Abstract

PURPOSE
Ultraviolet (UV) irradiation decreases epidermal hydration, which is maintained by reduction of natural moisturizing factors (NMFs). Among various NMFs, free amino acids (AA) are major constituents generated by filaggrin degradation. This experiment was conducted to determine whether or not dietary supplementation of green tea extract (GTE) in UV-irradiated mice can improve epidermal levels of hydration, filaggrin, free AAs, and peptidylarginine deiminase-3 (PAD3) expression (an enzyme involved in filaggrin degradation).
METHODS
Hairless mice were fed a diet of 1% GTE for 10 weeks in parallel with UV irradiation (group UV+1%GTE). As controls, hairless mice were fed a control diet in parallel with (group UV+) or without (group UV-) UV irradiation.
RESULTS
In group UV+, epidermal levels of hydration and filaggrin were lower than those in group UV-; these levels increased in group UV+1% GTE to levels similar to group UV-. Epidermal levels of PAD3 and major AAs of NMF, alanine, glycine and serine were similar in groups UV- and UV+, whereas these levels highly increased in group UV+1% GTE.
CONCLUSION
Dietary GTE improves epidermal hydration by filaggrin generation and degradation into AAs.

Keyword

green tea extract (GTE); filaggrin; peptidylarginine deiminase-3 (PAD3); natural moisturizing factor (NMF)
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