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Effects of unoprostone on phosphorylated extracellular signal-regulated kinase expression in endothelin-1-induced retinal and optic nerve damage

Published online by Cambridge University Press:  28 April 2008

YASUNARI MUNEMASA ,
YASUSHI KITAOKA ,
YASUHIRO HAYASHI ,
HIROYUKI TAKEDA ,
HIROMI FUJINO ,
RITSUKO OHTANI-KANEKO ,
KAZUAKI HIRATA  and
SATOKI UENO
YASUNARI MUNEMASA
Affiliation:
Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan
YASUSHI KITAOKA*
Affiliation:
Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan
YASUHIRO HAYASHI
Affiliation:
Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan
HIROYUKI TAKEDA
Affiliation:
Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan
HIROMI FUJINO
Affiliation:
Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan
RITSUKO OHTANI-KANEKO
Affiliation:
Department of Life Sciences, Toyo University, Itakura, Ouragun, Gunma, Japan
KAZUAKI HIRATA
Affiliation:
Department of Anatomy and Cell Biology, St. Marianna University School of Medicine, Kanagawa, Japan
SATOKI UENO
Affiliation:
Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan
*
Address correspondence and reprint requests to: Yasushi Kitaoka, Department of Ophthalmology, St. Marianna University School of Medicine, 2-16-1 Sugao, Miyamae-ku, Kawasaki, Kanagawa 216-8511, Japan. E-mail: kitaoka@marianna-u.ac.jp
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Abstract

Endothelin-1 (ET-1), a potent vasoconstrictor peptide, has been implicated in the development of normal- and high-tension glaucoma. We investigated the effects of unoprostone on extracellular signal-regulated kinase (ERK) in ET-1-induced retinal ganglion cell (RGC) death and optic nerve injury. Our morphometric study showed that intravitreal injection of ET-1 led to cell loss in the RGC layer (RGCL) in 28 days. Western blot analysis showed decreased neurofilament (NF) protein in the optic nerve 28 days after ET-1 injection. In this in vivo model, increased phosphorylated ERK (p-ERK) was observed in the retina on 1 day and subsequently in the optic nerve from 7 days after ET-1 injection. Simultaneous injection of M1, as a metabolite of unoprostone, showed further increased p-ERK levels compared with ET-1 injection alone. Our morphometric study of flat-mount preparations stained with cresyl violet or retrograde labeling with a neuro-tracer and Western blot analysis of NF showed that inhibition of ERK phosphorylation led to acceleration of ET-1-induced RGC death and optic nerve damage. In addition, M1 significantly attenuated both RGC loss and the decrease in NF protein induced by ET-1. The protective effects of M1 were significantly inhibited by U0126, an ERK inhibitor. These results suggest that unoprostone has neuroprotective effects against ET-1-induced neuronal injury through ERK phosphorylation.

Keywords

Endothelin-1; ERK; UnoprostoneOptic nerveRetinal ganglion cell
Type
Research Article
Information
Visual Neuroscience , Volume 25 , Issue 2 , March 2008 , pp. 197 - 208
Copyright
Copyright © Cambridge University Press 2008

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