Neuroprotective effect of a dietary supplement against glutamate-induced excitotoxicity in retina

• 作者: Akihisa Sugai Eriko Sugano Hiroshi Tomita Kitako Tabata Mariyo Kato Raki Shiraiwa Takahiro Kurose Yoichi Honma Yoko Mitsuguchi Yoshihiro Takai
• 来源期刊: 国际眼科杂志:英文版
• 学科: 医学
• 关键词: glutamate-induced toxicity retinal GANGLION CELLS HT-22 CELLS PERK
• 年，卷（期）: gjykzzywb_2019,（8）
• 页码范围: 1231-1237
• 页数: 7页
• 分类号: R774

摘要

AIM: To evaluate the neuroprotective effect of a dietary supplement(ClearVision EX~?;CV) against glutamateinduced excitotoxicity in retina.METHODS: We evaluated the protective effects CV on glutamate-induced cell toxicity of an immortalized mouse hippocampal cell line(HT-22) in vitro and N-methyl-Daspartate(NMDA) induced retinal injury in vivo. Once-daily oral administration of CV or vehicle(5% Arabic gum) was started the day before the NMDA injection and continued until the end of the study. Electroretinograms(ERGs) were recorded to evaluate the retinal function at 2 d after NMDA injection. Furthermore, a histological evaluation, Western blot analysis, and immunohistochemistry were performed for assessing the signal transduction pathway. RESULTS: HT-22 cell death was induced by the addition of glutamate and co-incubation with CV protected against it. Oral administration of CV inhibited the decrease in scotopic threshold response amplitudes induced by the intravitreal injection of NMDA and those of the thickness of the inner retinal layer in the histological evaluation. The increased phosphorylated levels of extracellular signalregulated kinase(ERK) but not cAMP response element binding protein(CREB) or Akt were observed 1 h after NMDA injection in both the vehicle-and CV-treated rats;however, p ERK activation was no more upregulated at 3 h after NMDA injection. pERK upregulation was observed in Müller cells.CONCLUSION: CV shows a protective effect against both glutamate-induced HT-22 cell death and NMDAinduced retinal damage. pERK upregulation in the Müller cells plays a key role in the protective effect of CV against glutamate-induced retinal toxicity.