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Next Generation Sequencing Facilitates Quantitative Analysis of HCC Cell Line HepG2 Cells with Inhibited P2X7 Receptor Signaling by Antagonist A740003 or A438079

ABSTRACT: Next Generation Sequencing Facilitates Quantitative Analysis of HCC Cell Line HepG2 Cells with Inhibited P2X7 Receptor Signaling by Antagonist A740003 or A438079

PROVIDER: PRJNA1117474 | ENA |

REPOSITORIES: ENA

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Next Generation Sequencing Facilitates Quantitative Analysis of HCC Cell Line HepG2 Cells with Inhibited P2X7 Receptor Signaling by Antagonist A740003 or A438079

Project description:The goals of this study aim to reveal the role of P2X7 receptor signaling in HCC

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Project description:Inflammasome activation in adipose tissue has been implicated in obesity-associated insulin resistance and type 2 diabetes. However, when and how inflammasome is activated in adipose tissue remains speculative. Here we test the hypothesis that extracellular ATP, a potent stimulus of inflammasome in macrophages via purinergic receptor P2X, ligand-gated ion channel, 7 (P2X7), may play a role in inflammasome activation in adipose tissue in obesity. Our data show that inflammasome is activated in adipose tissue upon 8-week feeding of 60% HFD, coinciding with the onset of hyperglycemia and hyperinsulinemia as well as the induction of P2X7 in adipose tissue. Unexpectedly, P2X7-deficient animals on HFD exhibit no changes in metabolic phenotypes, nor in inflammatory responses or inflammasome activation when compared to the wildtype controls. Similar observations have been obtained in hematopoietic cell-specific P2X7-deficient animals generated by bone marrow transplantation. Thus, we conclude that inflammasome activation in adipose tissue in obesity coincides with the onset of hyperglycemia and hyperinsulinemia, but unexpectedly, is not mediated by the ATP-P2X7 signaling axis. The nature of the inflammasome-activating danger signal(s) in adipose tissue in obesity remains to be characterized. Wild type and P2X7 knockout mice were fed a low fat diet (chow) or high fat diet for 12 weeks. After the diet intervention period, the animals were killed and epididymal white adipose tissue was removed. Total RNA was isolated and subjected to gene expression profiling.

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Project description:We explored the microRNA expression profile in mice lacking the P2X7 receptor before and after seizures. Genome-wide microRNA profiling was performed using hippocampi from wild-type and P2X7 knock-out mice following status epilepticus induced by intraamygdala kainic acid. This revealed that genetic deletion of the P2X7 receptor results in distinct patterns of microRNA expression. Specifically, we found that in vehicle-injected control mice the lack of P2X7 resulted in the up-regulation of 50 microRNAs and down-regulation of 35 microRNAs. Post-status epilepticus, P2X7 deficiency let to the up-regulation of 44 microRNAs while 13 microRNAs were down-regulated. Moreover, there was only limited overlap between identified P2X7-dependent microRNAs between control conditions and post-status epilepticus, suggesting P2X7 regulating the expression of different microRNAs during normal physiology and pathology. Bioinformatics analysis found that genes targeted via P2X7-dependent microRNAs were particularly overrepresented within pathways involved in intracellular signalling, inflammation and cell death, processes repeatedly linked to P2X7. Moreover, whereas genes involved in signalling pathways and inflammation were common among up-and down-regulated P2X7-dependent miRNAs during physiological and pathological conditions, genes associated with cell death seemed to be restricted to up-regulated miRNAs during both physiological conditions and post-status epilepticus. Taken together, our results demonstrate that P2X7 impacts on the expression profile of microRNAs in the brain, thereby possibly contributing to both the maintenance of normal cellular homeostasis and pathological processes.

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The ATP-P2X7 signaling axis is dispensable for obesity-associated inflammasome activation in adipose tissue

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Nanobody-based in vivo blockade of the P2X7 ion channel uncovers a hitherto unknown large subpopulation of parenchymal kidney TRM and NKT cells

Project description:The P2X7 ion channel, a key sensor of sterile inflammation, has been implicated as a therapeutic target in glomerulonephritis and P2X7-antagonistic nanobodies can attenuate experimental glomerulonephritis. However, little is known about the expression of P2X7 on renal immune cells. We used i.p. injection of nanobodies in mice followed by flow cytometry analysis of parenchymal T cells and RNA-sequencing to elucidate the expression and function of P2X7 on parenchymal and vascular immune cells in the mouse kidney. We show that parenchymal T cells, including a large subset NKT cells and tissue-resident memory T cells, display much higher cell surface levels of P2X7 than vascular T cells. These parenchymal T cells are highly sensitive to NAD+-induced cell death unless injection of P2X7-antagonistic nanobodies was performed before cell preparation. Remarkably, within 30 min after a single intraperitoneal injection of P2X7-blocking nanobodies, P2X7 is fully occupied by the injected nanobodies on parenchymal T cells in the kidney. This results in an effective protection of these cells from NAD+-induced cell death. Conversely, systemic injection of NAD+ that mimics sterile inflammation results in the selective depletion of P2X7hiCD69hi T cells from the kidney parenchyma. In summary, our study uncovers a novel purinergic regulatory mechanism affecting kidney resident T cell populations.

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