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Updated: Apr 2, 2026
A Cell Culture Model for Studying the Role of Neuron-Glia Interactions in Ischemia
Published on: November 14, 2020
O-GlcNAcylation regulates ischemia-induced neuronal apoptosis through AKT signaling
Jianhua Shi1,2,3, Jin-hua Gu3,4, Chun-ling Dai3
1Jiangsu Key Laboratory of Neuroregeneration, Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, Jiangsu 226001, China.
Abstract:
Apoptosis plays an important role in neural development and neurological disorders. In this study, we found that O-GlcNAcylation, a unique protein posttranslational modification with O-linked β-N-acetylglucosamine (GlcNAc), promoted apoptosis through attenuating phosphorylation/activation of AKT and Bad. By using co-immunoprecipitation and mutagenesis techniques, we identified O-GlcNAc modification at both Thr308 and Ser473 of AKT. O-GlcNAcylation-induced apoptosis was attenuated by over-expression of AKT. We also found a dynamic elevation of protein O-GlcNAcylation during the first four hours of cerebral ischemia, followed by continuous decline after middle cerebral artery occlusion (MCAO) in the mouse brain. The elevation of O-GlcNAcylation coincided with activation of cell apoptosis. Finally, we found a negative correlation between AKT phosphorylation and O-GlcNAcylation in ischemic brain tissue. These results indicate that cerebral ischemia induces a rapid increase of O-GlcNAcylation that promotes apoptosis through down-regulation of AKT activity. These findings provide a novel mechanism through which O-GlcNAcylation regulates ischemia-induced neuronal apoptosis through AKT signaling.
Insights
O-GlcNAcylation promotes apoptosis by reducing AKT activation, particularly during cerebral ischemia. This study reveals a novel mechanism linking O-GlcNAcylation to ischemia-induced neuronal death via the AKT signaling pathway.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Apoptosis is crucial in neural development and disorders.
- O-GlcNAcylation is a unique posttranslational modification involving O-linked β-N-acetylglucosamine (GlcNAc).
Purpose of the Study:
- To investigate the role of O-GlcNAcylation in apoptosis, specifically its effect on AKT and Bad.
- To elucidate the mechanism by which O-GlcNAcylation influences cerebral ischemia-induced neuronal apoptosis.
Main Methods:
- Co-immunoprecipitation and mutagenesis to identify O-GlcNAc modification sites on AKT.
- Over-expression of AKT to assess its role in O-GlcNAcylation-induced apoptosis.
- Middle cerebral artery occlusion (MCAO) model in mice to study dynamic changes in O-GlcNAcylation during cerebral ischemia.
Main Results:
- O-GlcNAcylation was found to promote apoptosis by attenuating AKT and Bad phosphorylation/activation.
- O-GlcNAc modification occurs at Thr308 and Ser473 of AKT.
- Protein O-GlcNAcylation dynamically increased during the initial hours of cerebral ischemia in mice, coinciding with increased apoptosis.
- A negative correlation was observed between AKT phosphorylation and O-GlcNAcylation in ischemic brain tissue.
Conclusions:
- Cerebral ischemia rapidly increases O-GlcNAcylation, which promotes neuronal apoptosis by down-regulating AKT activity.
- This study identifies a novel mechanism where O-GlcNAcylation regulates ischemia-induced neuronal apoptosis through the AKT signaling pathway.
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