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Abstract Title:

Protective Effects of Oral Astaxanthin Nanopowder against Ultraviolet-Induced Photokeratitis in Mice.

Abstract Source:

Oxid Med Cell Longev. 2017 ;2017:1956104. Epub 2017 Sep 28. PMID: 29104724

Abstract Author(s):

Fumiya Harada, Tetsuro Morikawa, Anton Lennikov, Anthony Mukwaya, Mira Schaupper, Osamu Uehara, Rie Takai, Koki Yoshida, Jun Sato, Yukihiro Horie, Hiroyuki Sakaguchi, Ching-Zong Wu, Yoshihiro Abiko, Neil Lagali, Nobuyoshi Kitaichi

Article Affiliation:

Fumiya Harada

Abstract:

Purpose: Astaxanthin (AST) has a strong antioxidant cellular membrane chaperone protective effect. Recently, a water-soluble nanosized AST (nano-AST) form was produced, which is expected to improve the efficacy of oral intake effects. The purpose of this study was to examine whether oral nano-AST has therapeutic effects on UV-induced photokeratitis in mice.

Methods: C57BL/6 mice were administered twice with either nano-AST, AST oil, lutein, or bilberry extracts 3 hours before and shortly before UV irradiation (dose: 400 mJ/cm(2)). The corneas were collected 24 hours after irradiation and stained with H&E and TUNEL. NF-κB, dihydroethidium (DHE), COX-2, p-IκB-α, TNFα, and CD45 expression were evaluated through immunohistochemistry, Western blot analysis, and qPCR.

Results: Corneal epithelium was significantly thicker in mice orally administered with nano-AST than in the others (p<0.01), with significantly less NF-κB nucleus translocation (p<0.001), and significantly fewer TUNEL cells (p<0.01). Weaker DHE signals were detected in the nano-AST group (p<0.05) relative to the others. Furthermore, reduced inflammation and decreased cell death in corneal tissue were observed in the nano-AST group, as indicated by a reduction in the expression of COX-2, p-IκB-α, TNFα, and CD45.

Conclusions: Oral administration of nano-AST demonstrated a protective effect on UV-induced photokeratitis via antioxidative, anti-inflammatory, and antiapoptotic activity.

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