Systematic compositional analysis of extracellular vesicles produced by cells undergoing apoptosis, necroptosis or necroptosis
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE221999 | GEO | 2023/09/30
REPOSITORIES: GEO
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Project description:The formation of extracellular vesicles (EVs) has emerged as a novel paradigm in cell-to-cell communication during health and disease. According to the type of cell death modalities, the intercellular functions of EVs may be influenced by their biogenesis and composition. To identify a possible EV cargo signature, we performed a comparative analysis of steady-state (ssEVs) and cell death-associated EVs (cdEVs) following apoptosis (apoEVs), necroptosis (necEVs) and ferroptosis (ferEVs) in the same cell type. We determined the physical and biochemical characteristics, the protein cargo by mass spectrometry.
2023-10-12 | PXD039297 | Pride
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.
2021-04-01 | GSE171214 | GEO
Project description:Extracellular vesicles (EVs) are important mechanisms used by cells to release biomolecules. A common necroptosis effector— mixed lineage kinase like (MLKL)--- was recently found to participate in the biogenesis of small and large EVs independent of its function in necroptosis. The objective of the current study is to gain mechanistic insights into EV biogenesis during necroptosis. We performed mass spectrometry-based proteomics on EVs released by healthy or necroptotic cells. Necroptosis increased the number of EVs released and altered the protein contents within the EVs. Comparing to EVs released by healthy cells, EVs released during necroptosis contained markedly higher number of unique proteins. Receptor interacting protein kinase 3 (RIPK3) and MLKL were among the proteins enriched in EVs released during necroptosis. Further, MEFs derived from mice deficient of Rab27a and Rab27b showed diminished basal EV release but responded to necroptosis with enhanced EV biogenesis as the wildtype MEFs. In contrast, necroptosis-associated EVs was sensitive to Ca2+ depletion or lysosomal disruption. Neither treatments affected the RIPK3-mediated MLKL phosphorylation. Our data suggests that necroptosis switches EV biogenesis from a Rab27a/b dependent mechanism to a lysosomal mediated mechanism.
2022-08-14 | PXD031224 | Pride
Project description:Mixed lineage kinase domain-like (MLKL) is the executioner in the caspase 8-independent form of programmed cell death called necroptosis. Once Receptor Interacting serine/threonine Protein Kinase 3 (RIPK3) is activated by upstream cell death signals, it phosphorylates MLKL and triggers the oligomerization and membrane translocation required for MLKL induced membrane disruption. Besides phosphorylation, MLKL also undergoes ubiquitylation during the early stages of necroptosis, yet neither the mechanism nor the significance of this event has been demonstrated. Here we show that necroptosis-specific, multi-mono-ubiquitylation of MLKL occurs on biological membranes, and requires its activation and oligomerisation. Inactive MLKL mutants recruited to membranes during necroptosis are ubiquitylated but this results in their proteasome and lysosome dependent turnover. We identified several ubiquitylated lysines however mutation of these did not affect MLKL ubiquitylation in response to a necroptotic stimulus.
2021-04-28 | PXD015537 | Pride
Project description:Bronchopulmonary dysplasia (BPD) remains the most frequent chronic lung disease among infants, which involves multifactorial pathogenesis. Necroptosis represents a caspase-independent mode of programmed cell death, and its deregulation associates with lung diseases, but the mechanisms of necroptosis during BPD are indistinct. This work was conducted for unveiling the post-transcriptional regulatory mechanisms of necroptosis in BPD.
2024-02-21 | GSE219156 | GEO
Project description:Caspase-8 and FADD play key roles in the regulation of cell death by necroptosis. The absence of either protein results in early embryonic lethality due to the activation of the kinase RIPK3 and its phosphorylation of the necroptosis executioner, MLKL. We genetically engineered and characterized a mouse model to monitor MLKL phosphorylation in the absence of necroptosis in vivo. Ablation of caspase-8 or FADD resulted in the transcriptional upregulation in several tissues of ZBP1, a cytosolic nucleic acid sensor capable of activating RIPK3, and ZBP1 was required for spontaneous phosphorylation of MLKL. Our findings provide a novel mechanism by which the FADD-Caspase-8 complex prevents necroptosis.
2022-09-19 | GSE208744 | GEO
Project description:Dynamic control of ubiquitination by deubiquitinating enzymes is essential for almost all biological processes. Ubiquitin-specific peptidase 22 (USP22) is part of the SAGA complex and catalyzes the removal of monoubiquitination from histone H2B, thereby regulating gene transcription. However, novel roles for USP22 have recently emerged, such as tumor development and cell death. Apart from apoptosis, the relevance of USP22 in other programmed cell death pathways still remains unclear. Here, we describe a novel role for USP22 in controlling necroptotic cell death in a variety of tumor cell lines. Loss of USP22 expression significantly delays TNF/Smac mimetic/zVAD.fmk (TBZ)-induced necroptosis, without affecting TNF-mediated NF-B activation or extrinsic apoptosis. Mass-spectrometric ubiquitin remnant profiling identified lysine 518 of Receptor-interacting protein kinase 3 (RIPK3) as USP22-dependent ubiquitination target during necroptosis induction. Mutation of K518 in RIPK3 reduced necroptosisassociated RIPK3 ubiquitination and amplified necrosome formation and necroptotic cell death. In conclusion, we identify a novel role of USP22 in necroptosis and further elucidate the relevance of ubiquitination as crucial regulator of necroptotic cell death.
2021-05-03 | PXD020909 | Pride
Project description:Healthy brain function is mediated by several complementary signalling pathways, many of which are driven by extracellular vesicles (EVs). EVs are heterogeneous in both size and cargo and are constitutively released from cells into the extracellular milieu. They are subsequently trafficked to recipient cells, whereupon their entry can modify the cellular phenotype. Here, in order to further analyse the mRNA and protein cargo of neuronal EVs, we isolated EVs by size exclusion chromatography from human induced pluripotent stem cell (iPSC)-derived neurons. Electron microscopy and dynamic light scattering revealed that the isolated EVs had a diameter of 30-100 nm. Transcriptomic and proteomics analyses of the EVs and neurons identified key molecules enriched in the EVs involved in cell surface interaction (integrins and collagens), internalisation pathways (clathrin- and caveolin-dependent), downstream signalling pathways (phospholipases, integrin-linked kinase and MAPKs), and long-term impacts on cellular development and maintenance. Overall, we show that key signalling networks and mechanisms are enriched in EVs isolated from human iPSC-derived neurons.
2020-08-20 | E-MTAB-8254 | biostudies-arrayexpress
Project description:Necroptosis is a regulated but inflammatory form of cell death. We and others have previously reported that necroptotic cells release extracellular vesicles (EVs). We found that necroptotic EVs are loaded with proteins, including the key necroptosis executor factor, phosphorylated mixed lineage kinase domain-like (pMLKL). However, the exact necroptotic EVs proteins composition and impact have not been delineated yet. To characterize their content, EVs from necroptotic and untreated U937 cells were isolated by ultracentrifugation and analyzed by mass spectrometry. A total of 3337 proteins were identified, sharing high similarity with exosome proteome databases. Unsupervised hierarchical clustering of identified proteins distinguished between necroptotic and control EVs. A total of 353 proteins was significantly upregulated in the necroptotic EVs. Among these are MLKL and caspase-8, as validated by immunoblot. Components of ESCRTIII machinery and inflammatory signaling were found to be enriched in the necroptotic EVs, as well as yet unreported components of vesicles formation and transport and necroptosis signaling pathways. Moreover, we show that necroptotic EVs can be phagocytosed by macrophages to modulate cytokine and chemokine secretion. Finally, we reveal that necroptotic EVs contain tumor neoantigen and are enriched with proteins annotated as “antigen processing and presentation” biological process. In summary, our study reveals a new layer of regulation during the early stage of necroptosis by the secretion of specific EVs that influence their microenvironment and may instigate innate and adaptive immune responses. Future investigation will shed light on new players in the necroptosis signaling and its related EVs, and will uncover the functional tasks accomplished by the cargo of these necroptotic EVs.
2021-11-11 | PXD018258 | Pride
Project description:Receptor-interacting protein kinase 1(RIPK1) is a key regulator of inflammation and cell death. Many sites on RIPK1, including serine 25, are phosphorylated to inhibit its kinase activity and cell death. How these inhibitory phosphorylation sites are dephosphorylated is poorly understood. Using a sensitized CRISPR whole genome knockout screen, we discover that protein phosphatase 1 regulatory subunit 3G (PPP1R3G) is required for RIPK1-dependent apoptosis and necroptosis. Mechanistically, PPP1R3G recruits its catalytic subunit protein phosphatase 1 gamma (PP1g) to Complex I to remove inhibitory phosphorylations of RIPK1. A PPP1R3G mutant which does not bind PP1g fails to rescue RIPK1 activation and cell death. Furthermore, chemical prevention of RIPK1 inhibitory phosphorylations or mutation of serine 25 of RIPK1 to alanine largely restores cell death in PPP1R3G-knockout cells. Finally, Ppp1r3g-/- mice are protected from tumor necrosis factor-induced systemic inflammatory response syndrome, confirming the important role of PPP1R3G in regulating apoptosis and necroptosis in vivo.
2021-10-26 | GSE176422 | GEO