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Cytoprotective Effect of Astaxanthin in a Model of Normal Intraocular Pressure Glaucoma

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Title: Cytoprotective Effect of Astaxanthin in a Model of Normal Intraocular Pressure Glaucoma
Authors: Kikuchi, Kasumi Browse this author
Dong, Zhenyu Browse this author →KAKEN DB
Shinmei, Yasuhiro Browse this author →KAKEN DB
Murata, Miyuki Browse this author →KAKEN DB
Kanda, Atsuhiro Browse this author →KAKEN DB
Noda, Kosuke Browse this author
Harada, Takayuki Browse this author
Ishida, Susumu Browse this author →KAKEN DB
Issue Date: 19-Sep-2020
Publisher: Hindawi Publishing Corporation
Journal Title: Journal of Ophthalmology
Volume: 2020
Start Page: 9539681
Publisher DOI: 10.1155/2020/9539681
Abstract: Glaucoma is characterized by axonal degeneration of retinal ganglion cells (RGCs) and apoptotic death of their cell bodies. Lowering intraocular pressure is currently the only way to treat glaucoma, but it is often insufficient to inhibit the progression of the disease. Glaucoma is a multifactorial disease, and the involvement of oxidative stress has recently received much attention. In the present study, we investigated the cytoprotective effect of astaxanthin (AST) on RGC degeneration using a normal-tension glaucoma (NTG) mouse model, which lacks theglutamate/aspartate transporter(Glast) and demonstrates spontaneous RGC and optic nerve degeneration without elevated intraocular pressure. Three-week-old Glast(+/-)mice were given intraperitoneal injections of AST at 10, 30, or 60 mg/kg/day or vehicle alone, and littermate control mice were given vehicle alone for 14 days, respectively. Five weeks after birth, the number of RGCs was counted in paraffin sections of retinal tissues stained with hematoxylin and eosin. We also used a retrograde labeling technique to quantify the number of RGCs. Additionally, the phosphorylated (p) I kappa B/total I kappa B ratio and the 4-hydroxynonenal (HNE) were measured in retinal tissues. The number of RGCs in Glast(+/-)mice was significantly decreased compared with that in control mice. RGC loss was suppressed by the administration of AST at 60 mg/kg/day, compared with vehicle alone. Following AST administration, the concentration of 4-HNE in the retina was also suppressed, but the pI kappa B/I kappa B ratio did not change. Our study revealed that the antioxidative stress effects of AST inhibit RGC degeneration in the retina and may be useful in the treatment of NTG.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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