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Learn MoreNecroptosis is a form of programmed cell death that is defined by activation of the kinase RIPK3, and subsequent cell membrane permeabilization by the effector MLKL. In addition to triggering cell death, RIPK3 activation can promote immune responses through the production of cytokines and chemokines. How active cytokine production is coordinated with the terminal process of necroptosis is unclear. Here, we report that cytokine production continues within necroptotic cells after cells have lost plasma membrane integrity and irreversibly commited to death. The continued production of inflammatory mediators was dependent on mRNA translation, and required maintanence of endoplasmic reticulum integrity, which remained in tact after plasma membrane integrity was lost. The continued translation of cytokines by cellular corpses contributed to necroptotic cell uptake by innate immune cells, as well as priming of adaptive immune responses to antigens associated with necroptotic corpses. These findings imply that necroptosis may represent a program in which cell death and production of inflammatory mediators are coordinated to optimize the immunogenicity of necroptotic cells. SOURCE: Shaun Cullen (secullen@tcd.ie) - Genentech
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