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Single cell RNAseq of iPSC tri-cultures treated with necroptosis inducer

ABSTRACT: Single cell RNAseq of iPSC tri-cultures treated with necroptosis inducer

PROVIDER: PRJNA1212752 | ENA |

REPOSITORIES: ENA

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Single cell RNAseq of iPSC tri-cultures treated with necroptosis inducer

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Quantitative analysis of phosphoproteome in necroptosis reveals a role of TRIM28 phosphorylation in promoting necroptosis-induced cytokine production

Project description:Necroptosis is a form of regulated necrotic cell death which promotes inflammation. In cells undergoing necroptosis, the activated RIPK1 kinase mediates the formation of RIPK1/RIPK3/MLKL complex to promote MLKL oligomerization and execution of necroptosis. RIPK1 kinase activity also promotes cell-autonomous activation of proinflammatory cytokine production in necroptosis. However, the signaling pathways downstream of RIPK1 kinase in necroptosis and how RIPK1 kinase activation controls inflammatory response induced by necroptosis are still largely unknown. Here we quantitatively measured the temporal dynamics of over 7000 confident phosphosites during necroptosis using mass spectrometry. Our study defined a RIPK1-dependent phosphorylation pattern in late necroptosis that is associated with a proinflammatory component marked by p-S473 TRIM28. We show that the activation of p38 MAPK mediated by oligomerized MLKL promotes the phosphorylation of S473 TRIM28, which in turn mediates inflammation during late necroptosis. Taken together, our study illustrates a mechanism by which p38 MAPK may be activated by oligomerized MLKL to promote inflammation in necroptosis.

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