Mis-localized mitochondrial ribosomes guide ceramide-dependent mitophagy for inducing cell death via alterations of the bioenergetics and metabolism
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ABSTRACT:
PROVIDER: PRJNA757757 | ENA |
REPOSITORIES: ENA
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Project description:In this work, we set out experiments to determine the mechanisms that regulate mitochondrial trafficking of p17/PERMIT-CerS1 complex in response to Drp1 activation to induce mitophagy and cellular consequences of this process altering mitochondrial metabolism in cultured cells in situ and genetic mice models in vivo. The data revealed that mislocalized mitochondrial ribosomes on the outer membrane due to Drp1-mediated fission are recognized by p17/PERMIT for CerS1 localization leading to ceramide-dependent mitophagy in response to oxidative stress by the generation of nitric oxide species (NOS). This process then leads to mitochondrial dysfunction resulting in decreased malate/fumarate/aspartate exhaustion, which is restored and prevented by molecular and genetic ablation of p17/PERMIT, LC3, Drp1, and Parkin in cancer cells or patient-derived 2D-organoids or mice brains in response to SoSe or ceramide analog drug, LCL768.
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Project description:Mechanisms by which Porphyromonas gingivalis (P. gingivalis) infection enhances oral tumor growth or resistance to cell death remain elusive. Here, we determined that P. gingivalis infection mediates therapeutic resistance via inhibiting lethal mitophagy in cancer cells and tumors. Mechanistically, P. gingivalis targets the LC3B-ceramide complex by associating with LC3B via bacterial major fimbriae (FimA) protein, preventing ceramide-dependent mitophagy in response to various therapeutic agents. Moreover, ceramide-mediated mitophagy is induced by Annexin A2 (ANXA2)-ceramide association, involving the E142 residue of ANXA2. Inhibition of ANXA2-ceramide-LC3B complex formation by wild-type P. gingivalis prevented ceramide-dependent mitophagy. Moreover, a FimA-deletion mutant P. gingivalis variant had no inhibitory effects on ceramide-dependent mitophagy. Further, 16S rRNA sequencing of oral tumors indicated that P. gingivalis infection altered the microbiome of the tumor macroenvironment in response to ceramide analog treatment in mice. Thus, these data provide a mechanism describing the pro-survival roles of P. gingivalis in oral tumors.
2024-06-23 | PXD051568 | Pride
Project description:The bioactive sphingolipid ceramide, generated by ceramide synthase, is an adaptive stress effector induced in response to various stress stimuli such as aging. In fact, ceramide synthase (CerS) was first discovered in yeast as a longevity assurance gene (LAG1), as the reduced ceramide generation consequent to LAG1 deletion increased longevity. There are six homologues of mammalian LAG1/ceramide synthases (CerS1-6) that generate ceramides with different fatty acid chain lengths with distinct functions and hydrophobicity. Ceramide can be metabolized by sphingosine kinase 1 or 2 for the generation of pro-survival sphingosine 1-phosphate (S1P), which enhances immune cell egress to the blood stream, activating immune function. Ceramide is known to induce mitophagy and cell death. Here we investigated the role of this sphingolipid pathway in immune function, specifically T cell functions, via high throughput expression profiling.
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Project description:Analysis of Neuroblastoma SH-SY5Y cell line treated with C2 ceramide, or combination of C2 ceramide and PJ34. Samples were collected in three time points: 3 hours, 6 hours and 24 hours. Results provide insight into the mechanism of cramide induced cell death and role of poly (ADP-ribose) polymerase in these proces.
2016-11-29 | GSE90587 | GEO
Project description:Bladder cancer is one of the most common malignancy in the urinary tract with high recurrence and drug resistance in clinics. Alternative treatments from existing drugs might be a promising strategy. Nitazoxanide (NTZ), an FDA-approved antiprotozoal drug, has got increasingly noticed because of its favorable safety profile and antitumor potential, yet the effects in bladder cancer and underlying mechanisms remain poorly understood. Herein, we find that NTZ induces mitochondrial damage and mitophagy initiation through PINK1-generated phospho-ubiquitin(pS65-Ub) and autophagy receptor-mediated pathway even in the absence of Atg5/Beclin1. Meanwhile, NTZ inhibits lysosomal degradation activity, leading to mitophagy flux impairment at late stage. Mitochondrial reactive oxygen species (ROS) production is critical in this process, as eliminating ROS with N-acetylcysteine (NAC) efficiently inhibits PINK1 signaling-mediated mitophagy initiation and alleviates lysosomal dysfunction. Co-treatment with NTZ and autophagy inhibitor Chloroquine (CQ) to aggravate mitophagy flux impairment promotes NTZ-induced apoptosis, while alleviation of mitophagy flux impairment with ROS scavenger reduced cell death. Moreover, we also discover a similar signaling response in the 3D bladder tumor spheroid after NTZ exposure. In vivo study reveals a significant inhibition of orthotopic bladder tumors with no obvious systemic toxicity. Together, our results uncover the anti-tumor activities of NTZ with the involvement of ROS-mediated mitophagy modulation at different stages and demonstrate it as a potential drug candidate for fighting against bladder tumors.
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Project description:Hematopoietic stem and progenitor cells (HSPCs) rely upon cellular crosstalk, including extracellular vesicles (EVs) for lifelong niche occupancy and cellular function. Vesicle secretion is tightly linked to intracellular homeostasis; however, these mechanisms are poorly understood in HSPCs, particularly at the single-cell level. In this study, we target ceramide-dependent EV secretion by pharmacologic blockade in ex vivo expanded HSPCs. We use these cells to investigate single-cell resolution of short-term and delayed transcriptional changes induced by ceramide-EV inhibition.
2023-10-01 | GSE226348 | GEO
Project description:The selective autophagic degradation of mitochondria via mitophagy is essential for preserving mitochondrial homeostasis and thereby disease maintenance and progression in acute myeloid leukemia. The process of mitophagy is orchestrated by a variety of mitophagy receptors whose interplay in AML is not well understood. Here, we established a dual multiplexed CRISPR screen targeting mitophagy receptors to elucidate redundancies and individual contributions of mitophagy receptors and gain a deeper understanding of the functional interactome governing mitophagy in AML.
2023-07-11 | GSE211073 | GEO
Project description:We have used human umbilical vein endothelial cell line (HUVEC) as a model to investigate the effect of ultrasound (US) activated micro-bubbles on sensitizing the tumour response to radiation and to check the implication of this approach on gene expression. The use of micro-bubbles in cancer therapy is a novel approach that is being recently investigated, and patterns of gene expressions were not yet characterized. Gene analysis has identified about 19,264 genes; where, 239 – 517 genes have shown more than two folds up-regulation in response to the different treatments. This included a number of genes that are known to be involved in apoptosis and ceramide-induced apoptosis pathways, such as Sphingomyelin phosphodiesterase 2, neutral sphingomyelinase (SMPD2), sphingomyelin phosphodiesterase 1, acid lysosomal (ASM; SMPD1), UDP-galactose ceramide galactosyltransferase (UGT8), cytochrome c oxidase (COX6B1), Caspase-9 and mitogen-activated protein kinase kinase 1 (MAP2K1). To verify these results, we have performed Real time RT-PCR, which indicated an up-regulation that ranged from 2 to 200 folds, specifically in the combined treatment of US, 3.3% micro-bubbles and 8 Gy. The observed higher levels of expression of UGT8, SMPD2 and Caspase 9-alpha when compared to the control or to radiation only indicated the involvement of ceramide, which possibly induces apoptosis . These results support the hypothesis that micro-bubbles play a role in increasing sensitization to radiation, and can prove to be an effective cancer therapeutic approach. Gene analysis has identified about 19,264 genes; where, 239 – 517 genes have shown more than two folds up-regulation in response to the different treatments. This included a number of genes that are known to be involved in apoptosis and ceramide-induced apoptosis pathways, such as Sphingomyelin phosphodiesterase 2, neutral sphingomyelinase (SMPD2), sphingomyelin phosphodiesterase 1, acid lysosomal (ASM; SMPD1), UDP-galactose ceramide galactosyltransferase (UGT8), cytochrome c oxidase (COX6B1), Caspase-9 and mitogen-activated protein kinase kinase 1 (MAP2K1). To verify these results, we have performed Real time RT-PCR, which indicated an up-regulation that ranged from 2 to 200 folds, specifically in the combined treatment of US, 3.3% micro-bubbles and 8 Gy. The observed higher levels of expression of UGT8, SMPD2 and Caspase 9-alpha when compared to the control or to radiation only indicated the involvement of ceramide, which possibly induces apoptosis . These results support the hypothesis that micro-bubbles play a role in increasing sensitization to radiation, and can prove to be an effective cancer therapeutic approach.
2009-08-27 | E-GEOD-17525 | biostudies-arrayexpress
Project description:Ceramide is an important lipid in skin barrier function. Psoriasis is a chronic inflammatory skin disease, and the skin barrier function has disturbed. Furthermore, the balance of each ceramide species in stratum corneum is disrupted in psoriatic skin. However, it involved remains unclear what detailed mechanism ceramide species changed in psoriatic skin lesion. We comprehensively investigated lipid metabolism including ceramide in skin of psoriasis patients by DNA microarray analysis. The expression level of PNPLA1 gene involved in acylceramide synthesis which is epidermis-specific ceramide species essential for skin barrier function was decreased in psoriatic skin. In contrast, the expression level of lipid metabolism-related enzymes gene including ceramide were increased in psoriatic skin. Consequently, the acylceramide synthesis was decreased in skin of psoriasis patients, suggesting that increased biosynthesis of other sphingolipids to supplement the function of acylceramide may cause the pathology of psoriasis.
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