Current eye research · 2003
Intrinsic activation of PI3K/Akt signaling pathway and its neuroprotective effect against retinal injury.
СтатьяПоддержка исследования: вне правительства СШАНазвание и аннотация: Перевод в очереди
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Nakazawa Toru, Shimura Masahiko, Tomita Hiroshi, Akiyama Hiroshi, Yoshioka Yuki, Kudou Hideyo, Tamai Makoto
Аннотация
PURPOSE: The aim of this study was to determine whether the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway can function as a neuroprotective pathway following induced retinal injury.
METHODS: The activation of Akt was assessed by immunoblot analysis, and the role of PI3K/Akt pathway was evaluated by TUNEL staining and counting the number of retrogradely-labeled retinal ganglion cells (RGCs) in the whole retina at 168 h after injury with or without PI3K specific inhibitor, LY294002.
RESULTS: Akt was induced within one hr and reached a maximum 6 hrs after optic nerve clamping. The activation was observed in the RGC layer including RGCs, the inner plexiform layer, inner nuclear layer, and in the photoreceptor outer segments. The number of surviving RGCs was decreased significantly 168 hrs after injury. LY294002 partially inhibited the activation of Akt, and significantly decreased the number of surviving RGCs as compared with that of injury alone.
CONCLUSIONS: These results indicate that the PI3K/Akt signaling pathway is activated intrinsically and has a neuroprotective effect on injured RGCs.
METHODS: The activation of Akt was assessed by immunoblot analysis, and the role of PI3K/Akt pathway was evaluated by TUNEL staining and counting the number of retrogradely-labeled retinal ganglion cells (RGCs) in the whole retina at 168 h after injury with or without PI3K specific inhibitor, LY294002.
RESULTS: Akt was induced within one hr and reached a maximum 6 hrs after optic nerve clamping. The activation was observed in the RGC layer including RGCs, the inner plexiform layer, inner nuclear layer, and in the photoreceptor outer segments. The number of surviving RGCs was decreased significantly 168 hrs after injury. LY294002 partially inhibited the activation of Akt, and significantly decreased the number of surviving RGCs as compared with that of injury alone.
CONCLUSIONS: These results indicate that the PI3K/Akt signaling pathway is activated intrinsically and has a neuroprotective effect on injured RGCs.
Предметные рубрики MeSH
AnimalsCell CountCell SurvivalChromonesConstrictionEnzyme InhibitorsFluorescent DyesIschemiaMaleMorpholinesOptic NervePhosphatidylinositol 3-KinasesPhosphoinositide-3 Kinase InhibitorsPhosphorylationProtein Serine-Threonine KinasesProto-Oncogene ProteinsProto-Oncogene Proteins c-aktRatsRats, Sprague-DawleyRetinal Ganglion CellsRetinal VesselsSignal TransductionStaining and LabelingStilbamidines