Abstract
Programmed cell death (PCD) plays critical roles in development, homeostasis, and both control and progression of a plethora of diseases, including cancer and neurodegenerative pathologies. Besides classical apoptosis, several different forms of PCD have now been recognized, including necroptosis. The way a cell dies determines the reaction of the surrounding environment, and immune activation in response to cell death proceeds in a manner dependent on which death pathways are activated. Apoptosis and necroptosis are major mechanisms of cell death that typically result in opposing immune responses. Apoptotic death usually leads to immunologically silent responses whereas necroptotic death releases molecules that promote inflammation, a process referred to as necroinflammation. Diseases of the nervous system, in particular neurodegenerative diseases, are characterized by neuronal death and progressive neuroinflammation. The mechanisms of neuronal death are not well defined and significant cross-talk between pathways has been suggested. Moreover, it has been proposed that the dying of neurons is a catalyst for activating immune cells in the brain and sustaining inflammatory output. In the current review we discuss the effects of apoptotis and necroptosis on inflammatory immune activation, and evaluate the roles of each cell death pathway in a variety of pathologies with specific focus on neurodegeneration. A putative model is proposed for the regulation of neuronal death and neuroinflammation that features a role for both the apoptotic and necroptotic pathways in disease establishment and progression.
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Acknowledgements
D.R.G. is supported by funding from the National Institutues of Health and the Lupus Research Alliance. B.L.H. is generously supported by the John H. Sununu Endowed Fellowship and National Institutes of Health grants AI138492 and JTWS6172 . B.T. is supported by the Paul Barrett Endowed Fellowship.
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Heckmann, B.L., Tummers, B. & Green, D.R. Crashing the computer: apoptosis vs. necroptosis in neuroinflammation. Cell Death Differ 26, 41–52 (2019). https://doi.org/10.1038/s41418-018-0195-3
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DOI: https://doi.org/10.1038/s41418-018-0195-3
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