An Atlas of Phosphorylation and Proteolytic Processing Events During Excitotoxic Neuronal Death Reveals New Therapeutic Opportunities
An Atlas of Phosphorylation and Proteolytic Processing Events During Excitotoxic Neuronal Death Reveals New Therapeutic Opportunities
Summary Excitotoxicity, a neuronal death process in neurological disorders, is initiated by over-stimulation of neuronal ionotropic glutamate receptors. The over-stimulated receptors dysregulate proteases, protein kinases and phosphatases, which in turn modify target neuronal proteins to induce cell death. To decipher this cell death mechanism, we used quantitative proteomics, phosphoproteomics and N-terminomics to identify modified proteins in excitotoxic neurons. Data, available in ProteomeXchange (identifiers: PXD019527 and PXD019211), enabled us to identify over one thousand such proteins with calpains, cathepsins and over twenty protein kinases as their major modifiers. These protein modification events can potentially perturb signalling pathways governing cell survival, synaptogenesis, axonal guidance and mRNA processing. Importantly, blocking the modification of Src protein kinase, a signalling hub in excitotoxic neurons, protected against neuronal loss in vivo in a rat model of neurotoxicity. Besides offering new insights into excitotoxic neuronal death mechanism, our findings suggest potential neuroprotective therapeutic targets for treating neurological disorders. Graphical abstractbiorxiv;2020.06.15.151456v1/UFIG1F1ufig1 HighlightsMulti-dimensional proteomic analysis identified proteins modified by proteolysis and altered phosphorylation in neurons undergoing excitotoxic cell death.Calpains, cathepsins and over twenty protein kinases are major modifiers of these proteins.These protein modification events are predicted to impact cell survival, axonal guidance, synaptogenesis and mRNA processing.Blocking modification of an identified protein Src, which acts as a major signalling hub in neurons, was protective against excitotoxic injury in vivo. In BriefUsing multidimensional proteomic approaches, Ameen, et al. mapped the changes of proteome, phosphoproteome and N-terminome of cultured primary neurons during excitotoxicity, a crucial neuronal death process in neurological disorders. These proteomic changes document new excitotoxicity-associated molecular events, and offer insights into how these events are organized to induce neuronal death. Potential therapeutic relevance of these molecular events is illustrated by the demonstration that in vivo blockade of one of these events could protect against excitotoxic neuronal loss.
Liu Dazhi、Lucet Isabelle S.、Hoque Ashfaqul、Lim Jet Phey、Zhu Hong-Jian、Roulston Carli、Kleifeld Oded、Giuseppe D. Ciccotosto、Ang Ching-Seng、Sturgeon Sharelle、Nandurkar Harshal、Draxler Dominik、Medcalf Robert、Williamson Nicholas A.、Ameen S. Sadia、Kamaruddin Mohd Aizuddin、Dhillon Amardeep、Dufour Antoine、Cheng Heung-Chin、Leeming Michael G.、Bokhari Laita、Hossain M. Iqbal
Department of Neurology, School of Medicine, University of CaliforniaChemical Biology Division, The Walter and Eliza Hall Institute for Medical Research||Department of Medical Biology, University of MelbourneSt. Vincent?ˉs Institute for Medical ResearchSchool of Medicine, Faculty of Health, Deakin UniversityDepartment of Surgery (Royal Melbourne Hospital), University of MelbourneFlorey Institute of Neuroscience and Mental HealthFaculty of Biology, Technion-Israel Institute of TechnologyDepartment of Pharmacology and Therapeutics, University of MelbourneBio21 Molecular Science and Biotechnology Institute, University of MelbourneAustralian Centre for Blood Diseases, Monash UniversityAustralian Centre for Blood Diseases, Monash UniversityAustralian Centre for Blood Diseases, Monash UniversityAustralian Centre for Blood Diseases, Monash UniversityBio21 Molecular Science and Biotechnology Institute, University of MelbourneDepartment of Biochemistry and Molecular Biology, University of Melbourne||Bio21 Molecular Science and Biotechnology Institute, University of MelbourneDepartment of Biochemistry and Molecular Biology, University of Melbourne||Bio21 Molecular Science and Biotechnology Institute, University of MelbourneSchool of Medicine, Faculty of Health, Deakin UniversityDepartment of Physiology and Pharmacology, University of CalgaryDepartment of Biochemistry and Molecular Biology, University of Melbourne||Bio21 Molecular Science and Biotechnology Institute, University of MelbourneBio21 Molecular Science and Biotechnology Institute, University of MelbourneDepartment of Biochemistry and Molecular Biology, University of Melbourne||Bio21 Molecular Science and Biotechnology Institute, University of MelbourneDepartment of Biochemistry and Molecular Biology, University of Melbourne||Bio21 Molecular Science and Biotechnology Institute, University of Melbourne
神经病学、精神病学基础医学分子生物学
Liu Dazhi,Lucet Isabelle S.,Hoque Ashfaqul,Lim Jet Phey,Zhu Hong-Jian,Roulston Carli,Kleifeld Oded,Giuseppe D. Ciccotosto,Ang Ching-Seng,Sturgeon Sharelle,Nandurkar Harshal,Draxler Dominik,Medcalf Robert,Williamson Nicholas A.,Ameen S. Sadia,Kamaruddin Mohd Aizuddin,Dhillon Amardeep,Dufour Antoine,Cheng Heung-Chin,Leeming Michael G.,Bokhari Laita,Hossain M. Iqbal.An Atlas of Phosphorylation and Proteolytic Processing Events During Excitotoxic Neuronal Death Reveals New Therapeutic Opportunities[EB/OL].(2025-03-28)[2025-04-28].https://www.biorxiv.org/content/10.1101/2020.06.15.151456.点此复制
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