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• W2073133734 abstract "A new group of proteins, small ubiquitin-like modifier (SUMO) proteins, has recently been identified and protein sumoylation has been shown to play a major role in various signal transduction pathways. Here, we report that transient global cerebral ischemia induces a marked increase in protein sumoylation. Mice were subjected to 10 mins severe forebrain ischemia followed by 3 or 6 h of reperfusion. Transient cerebral ischemia induced a massive increase in protein sumoylation by SUMO2/3 both in the hippocampus and cerebral cortex. SUMO2/3 conjugation was associated with a decrease in levels of free SUMO2/3. After ischemia, protein levels of the SUMO-conjugating enzyme Ubc9 were transiently decreased in the cortex but not in the hippocampus. We also exposed HT22 cells to arsenite, a respiratory poison that impairs cytoplasmic function and induces oxidative stress. Arsenite exposure induced a marked rise in protein sumoylation, implying that impairment of cytoplasmic function and oxidative stress may be involved in the massive post-ischemic activation of SUMO conjugation described here. Sumoylation of transcription factors has been shown to block their activation, with some exceptions such as the heat-shock factor and the hypoxia-responsive factor, where sumoylation blocks their degradation, and the nuclear factor-κB (NF-κB) essential modulator where sumoylation leads to an activation of NF-κB. Because protein sumoylation is known to be involved in the regulation of various biologic processes, the massive post-ischemic increase in protein sumoylation may play a critical role in defining the final outcome of neurons exposed to transient ischemia." @default.
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• W2073133734 date "2007-06-13" @default.
• W2073133734 modified "2023-10-12" @default.
• W2073133734 title "Transient Global Cerebral Ischemia Induces a Massive Increase in Protein Sumoylation" @default.
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• W2073133734 doi "https://doi.org/10.1038/sj.jcbfm.9600523" @default.
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