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Pannexin-1 promotes NLRP3 activation during apoptosis but is dispensable for canonical or Non-canonical inflammasome activation.

08:00 EDT 14th August 2019 | BioPortfolio

Summary of "Pannexin-1 promotes NLRP3 activation during apoptosis but is dispensable for canonical or Non-canonical inflammasome activation."

Inflammasomes are multimeric protein complex that assemble in the cytosol upon microbial infection or cellular stress. Upon activation, inflammasomes drive the maturation of proinflammatory cytokines interleukin (IL)-1β and IL-18, and also activate the pore-forming protein gasdermin D to initiate a form of lytic cell death known as 'pyroptosis'. Pannexin-1 is channel-forming glycoprotein that promotes membrane permeability and ATP release during apoptosis; and was implicated in canonical NLRP3 or non-canonical inflammasome activation. Here, by utilising three different pannexin-1 channel inhibitors and two lines of Panx1 macrophages, we provide genetic and pharmacological evidence that pannexin-1 is dispensable for canonical or non-canonical inflammasome activation. Instead, we demonstrate that pannexin-1 cleavage and resulting channel activity during apoptosis promotes NLRP3 inflammasome activation. This article is protected by copyright. All rights reserved.

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Name: European journal of immunology
ISSN: 1521-4141
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Medical and Biotech [MESH] Definitions

A signal transducing adaptor protein that contains an N-terminal CARD DOMAIN and functions in the ADAPTIVE IMMUNE RESPONSE. It promotes PRO-CASPASE-9 maturation and APOPTOSIS, activation of NF-KAPPA B, and is a substrate for MALT1 PARACASPASE.

A proteolytically-cleaved membrane glycoprotein and member of the TNF superfamily that is highly expressed in a variety of tissues including heart, pancreas, brain, and peripheral blood lymphocytes. The secreted extracellular form is a weak inducer of APOPTOSIS for some cell types and a ligand for the FN14 RECEPTOR. It mediates activation of NF-KAPPA-B and promotes ANGIOGENESIS and proliferation of ENDOTHELIAL CELLS, as well as expression of cytokines involved in INFLAMMATION.

A flavoprotein that functions as a powerful antioxidant in the MITOCHONDRIA and promotes APOPTOSIS when released from the mitochondria. In mammalian cells AIF is released in response to pro-apoptotic protein members of the bcl-2 protein family. It translocates to the CELL NUCLEUS and binds DNA to stimulate CASPASE-independent CHROMATIN condensation.

A serine peptidase that contains a C-terminal PDZ domain. It localizes to the mitochondrial membrane and intermembrane space, translocating to the cytoplasm following APOPTOSIS stimuli, such as UV irradiation; it promotes cell death by binding to and inhibiting INHIBITOR OF APOPTOSIS PROTEINS, resulting in an increase in activity of CASPASES. Mutations in the HTRA2 gene are associated with Type 13 PARKINSON DISEASE.

A secreted tumor necrosis factor receptor family member that has specificity for TNF-RELATED APOPTOSIS-INDUCING LIGAND. It plays a modulating role in activation of APOPTOSIS signaling.

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