Functional analysis of caspase cleavable proteoforms of the Drosophila GSK-3 gene shaggy.
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ABSTRACT:
ORGANISM(S): Drosophila melanogaster
PROVIDER: GSE157625 | GEO | 2020/09/09
REPOSITORIES: GEO
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Project description:Functional analysis of caspase cleavable proteoforms of the Drosophila GSK-3 gene shaggy.
| PRJNA662249 | ENA
Project description:Excessive responses to pattern-recognition receptors are prevented by regulatory mechanisms that affect the amounts, conformation, and associative properties of their signaling proteins. We report that signaling by the ribonucleic acid sensor RIG-I is restricted, in addition, by caspase-mediated cleavage that results in conversion of a signaling enhancer to a signaling inhibitor. RIP1 and caspase-8, two proteins known to mediate effects of receptors of the TNF/NGF family, are recruited to the RIG-I complex following viral infection, and serve in a coordinated manner antagonistic regulatory roles: conjugation of a ubiquitin chain to Lys-377 in RIP1 facilitates assembly of the RIG-I complex, but it also renders RIP1 susceptible to caspase-8-mediated cleavage, yielding an inhibitory RIP1 fragment. The dependence of RIP1 cleavage on the same molecular change as the one that facilitates RIG-I signaling allows for RIG-I signaling to be restricted in its duration without compromising its initial activation. Transcriptional profiling of human SV80 cells comparing cells infected with control lenti virus to cells infected with caspase-8 siRNA expressing lenti virus. Goal was to determine the effects of caspase-8 knock down on global gene expression. Two-condition experiment, Control lenti Vs caspase-8 siRNA expressing lenti. Biological replicates: 4 control, 4 caspase-8 siRNA infected
2011-02-07 | E-GEOD-23363 | biostudies-arrayexpress
Project description:Excessive responses to pattern-recognition receptors are prevented by regulatory mechanisms that affect the amounts, conformation, and associative properties of their signaling proteins. We report that signaling by the ribonucleic acid sensor RIG-I is restricted, in addition, by caspase-mediated cleavage that results in conversion of a signaling enhancer to a signaling inhibitor. RIP1 and caspase-8, two proteins known to mediate effects of receptors of the TNF/NGF family, are recruited to the RIG-I complex following viral infection, and serve in a coordinated manner antagonistic regulatory roles: conjugation of a ubiquitin chain to Lys-377 in RIP1 facilitates assembly of the RIG-I complex, but it also renders RIP1 susceptible to caspase-8-mediated cleavage, yielding an inhibitory RIP1 fragment. The dependence of RIP1 cleavage on the same molecular change as the one that facilitates RIG-I signaling allows for RIG-I signaling to be restricted in its duration without compromising its initial activation.
2011-02-07 | GSE23363 | GEO
Project description:Integration of Innate Immune Signaling by 2 Caspase-8-Mediated Cleavage of N4BP1
| MSV000086111 | MassIVE
Project description:COFRADIC identification of human recombinant caspase-2, -3, -7 cleavage sites
2012-08-15 | PRD000557 | Pride
Project description:Human mutations in the death receptor Fas or its ligand FasL cause autoimmune lymphoproliferative syndrome (ALPS), whereas mutations in caspase-8 or its adaptor FADD â which mediate cell death downstream of Fas/FasL â cause severe immunodeficiency in addition to ALPS. Mouse models have corroborated a role for FADD-caspase-8 in promoting inflammatory responses, but the mechanisms underlying immunodeficiency remain undefined. Here, we identify NEDD4-binding protein 1 (N4BP1) as a suppressor of cytokine production that is cleaved and inactivated by caspase-8. N4BP1 deletion in mice significantly increased production of select cytokines upon Toll-like receptor (TLR) 1/2, TLR7, or TLR9 stimulation, but not upon TLR3 or TLR4 engagement. N4BP1 did not suppress TLR3 or TLR4 responses in wild-type macrophages owing to TRIF- and caspase-8-dependent cleavage of N4BP1. Notably, impaired TLR3 and TLR4 cytokine responses of caspase-8-deficient macrophages were largely rescued by co-deletion of N4BP1. Thus, persistence of intact N4BP1 in caspase-8-deficient macrophages impairs their ability to mount robust cytokine responses. Tumor necrosis factor (TNF), like TLR3 or TLR4 agonists, also induced caspase-8-dependent cleavage of N4BP1, thereby licensing TRIF-independent TLRs to produce higher levels of inflammatory cytokines. Illustrating the importance of this function of TNF in vivo, TNF blockade increased the mortality of mice infected with Streptococcus Pneumoniae, but did not do so when infected mice lacked N4BP1. Collectively, our results identify N4BP1 as a potent suppressor of cytokine responses; reveal N4BP1 cleavage by Caspase-8 as a point of signal integration during inflammation; and offer an explanation for immunodeficiency caused by FADD-caspase-8 mutations.
2020-09-09 | GSE148066 | GEO
Project description:Human mutations in the death receptor Fas or its ligand FasL cause autoimmune lymphoproliferative syndrome (ALPS), whereas mutations in caspase-8 or its adaptor FADD â which mediate cell death downstream of Fas/FasL â cause severe immunodeficiency in addition to ALPS. Mouse models have corroborated a role for FADD-caspase-8 in promoting inflammatory responses, but the mechanisms underlying immunodeficiency remain undefined. Here, we identify NEDD4-binding protein 1 (N4BP1) as a suppressor of cytokine production that is cleaved and inactivated by caspase-8. N4BP1 deletion in mice significantly increased production of select cytokines upon Toll-like receptor (TLR) 1/2, TLR7, or TLR9 stimulation, but not upon TLR3 or TLR4 engagement. N4BP1 did not suppress TLR3 or TLR4 responses in wild-type macrophages owing to TRIF- and caspase-8-dependent cleavage of N4BP1. Notably, impaired TLR3 and TLR4 cytokine responses of caspase-8-deficient macrophages were largely rescued by co-deletion of N4BP1. Thus, persistence of intact N4BP1 in caspase-8-deficient macrophages impairs their ability to mount robust cytokine responses. Tumor necrosis factor (TNF), like TLR3 or TLR4 agonists, also induced caspase-8-dependent cleavage of N4BP1, thereby licensing TRIF-independent TLRs to produce higher levels of inflammatory cytokines. Illustrating the importance of this function of TNF in vivo, TNF blockade increased the mortality of mice infected with Streptococcus Pneumoniae, but did not do so when infected mice lacked N4BP1. Collectively, our results identify N4BP1 as a potent suppressor of cytokine responses; reveal N4BP1 cleavage by Caspase-8 as a point of signal integration during inflammation; and offer an explanation for immunodeficiency caused by FADD-caspase-8 mutations.
2020-09-10 | GSE157786 | GEO
Project description:Here, we show that HuR cleavage is dependent on active caspase-3 in oral cancer cells treated with ionizing radiation and the chemotherapeutic drug paclitaxel. We determined that oral cancer cells overexpressing cyclooxygenase-2 (COX-2) limited the cleavage of both caspase-3 and HuR, which in turn, reduced the rate of apoptosis in paclitaxel treated cells. Specific inhibition of COX-2 by celecoxib promoted apoptosis through activation of caspase-3 and cleavage of HuR in paclitaxel-resistant oral cancer cells. In addition, oral cancer cells overexpressing cellular HuR increased the half-life of COX-2 mRNA and promoted COX-2 expression, exhibiting enhanced tumor growth in vivo in comparison with the cleavable form of HuR. Finally, our RNP IP and RNA transcriptome analysis of HuR under IR revealed that the HuR cleavage product-1 (HuR-CP1) associates and promotes the expression of mRNAs encoding proteins involved in apoptosis.
2017-02-14 | GSE79477 | GEO
Project description:Mutation in nucleophosmin (NPM1) causes relocalization of this normally nucleolar protein to the cytoplasm (NPM1c+). Despite NPM1 mutation being the most common driver mutation in cytogenetically normal adult acute myeloid leukemia (AML), the mechanisms of NPM1c+-induced leukemogenesis remain unclear. Caspase-2 is a pro-apoptotic protein activated by NPM1 in the nucleolus. Here, we show that caspase-2 is also activated by NPM1c+ in the cytoplasm and DNA damage-induced apoptosis is caspase-2-dependent in NPM1c+ but not in NPM1wt AML cells. Strikingly, in NPM1c+ cells, caspase-2 loss results in profound cell cycle arrest, differentiation, and down-regulation of stem cell pathways that regulate pluripotency including impairment in the AKT/mTORC1 and Wnt signaling pathways, and inhibition of Rictor cleavage. In contrast, there were minimal differences in proliferation, differentiation, or the transcriptional profile of NPM1wt cells lacking caspase-2. Our results show that caspase-2 is essential for proliferation and self-renewal of AML cells expressing mutated NPM1. This study demonstrates that caspase-2 is a major effector of NPM1c+ function.
2024-04-17 | GSE249545 | GEO
Project description:Cells are in constant adaptation to environmental changes to insure their proper functioning. When exposed to stresses, cells activate specific pathways to elicit adaptive modifications. Those changes can be mediated by selective modulation of gene and protein expression as well as by post-translational modifications, such as phosphorylation and proteolytic processing. Protein cleavage, as a controlled and limited post-translational modification, is involved in diverse physiological processes such as the maintenance of protein homeostasis, activation of repair pathways, apoptosis and the regulation of proliferation. Here we assessed by quantitative proteomics the proteolytic landscape in two cell lines subjected to low cisplatin concentrations used as a mild non-lethal stress paradigm. This landscape was compared to the one obtained in the same cells stimulated with cisplatin concentrations inducing apoptosis. These analyses were performed in wild-type cells and in cells lacking the two main executioner caspases: caspase-3 and caspase-7. Ninety proteins were found to be cleaved at one or a few sites (discrete cleavage) in low stress conditions compared to four hundred and forty in apoptotic cells. Many of the cleaved proteins in stressed cells were also found to be cleaved in apoptotic conditions. As expected in apoptotic cells, ~80% of the cleavage events were dependent on caspase 3/caspase 7. Strikingly, upon exposure to non-lethal stresses, no discrete cleavage was detected in cells lacking caspase-3 and caspase-7. This indicates that the proteolytic landscape in stressed viable cells fully depends on the activity of executioner caspases. These results suggest that the so-called executioner caspases fulfill important stress adaptive responses distinct from their role in apoptosis.
2021-07-07 | PXD023488 | Pride