RNAseq of Wild Type and pikfyveΔ8 zebrafish.
Ontology highlight
ABSTRACT:
ORGANISM(S): Danio rerio
PROVIDER: GSE247110 | GEO | 2023/12/01
REPOSITORIES: GEO
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Project description:Conversion between phosphatidylinositol-3-phosphate and phosphatidylinositol-3,5-bisphosphate on endosomal membranes is critical for maturation of early endosomes to late endosomes/lysosomes, and is regulated by the PIKfyve-Vac14-Fig4 complex. In this study, we screened for the cellular interactome of Vac14 and Fig4 using proximity-dependent biotin labelling (BioID) in 293T cells.
2021-11-03 | PXD027917 | Pride
Project description:Given the importance of deregulated phosphoinositide (PI) signaling in leukemic hematopoiesis, genes coding for proteins that regulate PI metabolism may have significant and as yet unappreciated roles in leukemia. We performed a targeted knockdown screen of PI modulator genes in human AML cells and identified candidates required to sustain proliferation or prevent apoptosis. One of these, the lipid kinase phosphatidylinositol-5-phosphate 4-kinase, type II, alpha (PIP4K2A) regulates cellular levels of phosphatidylinositol-5-phosphate (PtsIns5P) and phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2). We found PIP4K2A to be essential for the clonogenic and leukemia-initiating potential of human AML cells, and for the clonogenic potential of murine MLL-AF9 AML cells. Importantly, PIP4K2A is also required for the clonogenic potential of primary human AML cells. Its knockdown results in accumulation of the cyclin-dependent kinase inhibitors CDKN1A and CDKN1B, G1 cell cycle arrest and apoptosis. Both CDKN1A accumulation and apoptosis were partially dependent upon activation of the mTOR pathway. Critically, however, PIP4K2A knockdown in normal hematopoietic stem and progenitor cells, both murine and human, did not adversely impact either clonogenic or multilineage differentiation potential, indicating a selective dependency which we suggest may be the consequence of the regulation of different transcriptional programmes in normal versus malignant cells. Thus, PIP4K2A is a novel candidate therapeutic target in myeloid malignancy.
2014-03-13 | GSE54309 | GEO
Project description:Pancreatic ductal adenocarcinoma (PDAC) thrives in a nutrient-deprived microenvironment, making it particularly susceptible to treatments that interfere with cancer metabolism. For example, PDAC utilizes and is dependent on high levels of autophagy and other lysosomal processes. Although targeting these pathways has shown potential in pre-clinical studies, progress has been hampered by the challenge of identifying and characterizing favorable targets for drug development. Here, we characterize PIKfyve, a lipid kinase integral to lysosomal functioning as a novel and targetable vulnerability in PDAC. Through comprehensive metabolic analyses we find that PIKfyve inhibition obligates PDAC to upregulate de novo lipid synthesis, a relationship previously undescribed. PIKfyve inhibition triggers a distinct lipogenic gene expression and metabolic program, creating a dependency on de novo lipid metabolism pathways, including genes such as FASN and ACACA. These results suggest that targeting PIKfyve disrupts lysosome-dependent lipid metabolism in PDAC and may be a favorable metabolic target for therapeutic development. Further, this data suggests that one could take advantage of this synthetic dependency by co-targeting PIKfyve and FASN or ACACA as a therapeutic strategy.
2024-04-10 | GSE255377 | GEO
Project description:Pancreatic ductal adenocarcinoma (PDAC) thrives in a nutrient-deprived microenvironment, making it particularly susceptible to treatments that interfere with cancer metabolism. For example, PDAC utilizes and is dependent on high levels of autophagy and other lysosomal processes. Although targeting these pathways has shown potential in pre-clinical studies, progress has been hampered by the challenge of identifying and characterizing favorable targets for drug development. Here, we characterize PIKfyve, a lipid kinase integral to lysosomal functioning as a novel and targetable vulnerability in PDAC. Through comprehensive metabolic analyses we find that PIKfyve inhibition obligates PDAC to upregulate de novo lipid synthesis, a relationship previously undescribed. PIKfyve inhibition triggers a distinct lipogenic gene expression and metabolic program, creating a dependency on de novo lipid metabolism pathways, including genes such as FASN and ACACA. These results suggest that targeting PIKfyve disrupts lysosome-dependent lipid metabolism in PDAC and may be a favorable metabolic target for therapeutic development. Further, this data suggests that one could take advantage of this synthetic dependency by co-targeting PIKfyve and FASN or ACACA as a therapeutic strategy.
2024-04-10 | GSE255375 | GEO
Project description:Using genome-wide transcriptional profiling and whole-mount expression analyses of zebrafish larvae, we have identified hyaluronan synthase 3 (has3) as an upregulated gene during caudal fin regeneration. has3 expression is induced in the wound epithelium within hours after tail amputation, and its onset and maintenance requires fibroblast growth factor, phosphoinositide 3-kinase, and transforming growth factor-β signaling. Inhibition of hyaluronic acid (HA) synthesis by the small molecule 4-methylumbelliferone (4-MU) impaired tail regeneration in zebrafish larvae by preventing injury-induced cell proliferation. In addition, 4-MU reduced the expression of genes associated with wound epithelium and blastema function. Treatment with the glycogen synthase 3-kinase inhibitors rescued 4-MU-induced defects in cell proliferation and tail regeneration, even though only a subset of wound epithelium and blastema markers was restored. Our findings uncover a role for HA biosynthesis in zebrafish tail regeneration and its epistatic relationships with other regenerative processes.
2017-03-10 | GSE72422 | GEO
Project description:Skeletal muscle mass is an important determinant of whole-body glucose disposal. We here show that mice (M-PDK1KO mice) with skeletal muscle–specific deficiency of 3'-phosphoinositide–dependent kinase 1 (PDK1), a key component of the phosphatidylinositol 3-kinase (PI3K) signaling pathway, manifest a reduced skeletal muscle mass under the static condition as well as impairment of exercise load–induced muscle hypertrophy. Whereas exercise load-induced changes in gene expression were not affected, the phosphorylation of ribosomal protein S6 kinase (S6K) and S6 induced by exercise load was attenuated in skeletal muscle of M-PDK1KO mice, suggesting that PDK1 regulates muscle hypertrophy not through changes in gene expression but through stimulation of protein synthesis via the S6K-S6 axis.
2020-05-14 | GSE150464 | GEO
Project description:Rationale: The acute respiratory distress syndrome is refractory to pharmacological intervention. Inappropriate activation of alveolar neutrophils is believed to underpin this disease’s complex pathophysiology, yet these cells have been little studied. Objectives: To examine the functional and transcriptional profiles of patient blood and alveolar neutrophils compared to healthy volunteer cells, and define their sensitivity to phosphoinositide 3-kinase inhibition. Methods: Twenty three ventilated patients underwent bronchoalveolar lavage. Alveolar and blood neutrophil apoptosis, phagocytosis and adhesion molecules were quantified by flow cytometry, and oxidase responses by chemiluminescence. Cytokine and transcriptional profiling utilized multiplex and GeneChip arrays. Measurements and Main Results: Patient blood and alveolar neutrophils were distinct from healthy circulating cells, with increased CD11b and reduced CD62L expression, delayed apoptosis and constitutively primed oxidase responses. Incubating control cells with disease bronchoalveolar lavage recapitulated the aberrant functional phenotype and this could be reversed by phosphoinositide 3-kinase inhibitors. In contrast, the pro-survival phenotype of patient cells was recalcitrant to phosphoinositide 3-kinase inhibition. RNA transcriptomic analysis revealed modified immune, cytoskeletal and cell death pathways in patient cells, aligning closely to sepsis and burns data sets but not with phosphoinositide 3-kinase signatures. Conclusions: Acute respiratory distress syndrome blood and alveolar neutrophils display a distinct primed, pro-survival profile and transcriptional signature. The enhanced respiratory burst was phosphoinositide 3-kinase-dependent, but delayed apoptosis and the altered transcriptional profile were not. These unexpected findings cast doubt over the utility of phosphoinositide 3-kinase inhibition in acute respiratory distress syndrome and highlight the importance of evaluating novel therapeutic strategies in patient-derived cells.
2016-04-11 | GSE76293 | GEO
Project description:Through deep sequencing and functional screening in zebrafish, we find that miR-221 is essential for angiogenesis. miR-221 knockdown phenocopied defects associated with loss of the tip cell-expressed Flt4 receptor. Furthermore, miR-221 was required for tip cell proliferation and migration, as well as tip cell potential in mosaic blood vessels. miR-221 knockdown also prevented “hyper-angiogenesis” defects associated with Notch deficiency and miR-221 expression was inhibited by Notch signaling. Finally, miR-221 promoted tip cell behavior through repression of two targets: cyclin-dependent kinase inhibitor 1b (cdkn1b) and phosphoinositide-3-kinase regulatory subunit 1 (pik3r1). These results identify miR-221 as an important regulatory node through which tip cell migration and proliferation are controlled during angiogenesis. Identification of endothelial-expressed microRNA from FACS-isolated zebrafish endothelial cells.
2012-02-28 | E-GEOD-35078 | biostudies-arrayexpress
Project description:Genes activated by s.a through the activity of phosphatidylinositol 4-kinase- Role of phosphatidylinositol 4-kinase
| PRJNA100491 | ENA
Project description:Despite the remarkable clinical success of immunotherapies in a subset of cancer patients, many fail to respond to treatment and exhibit primary resistance. Here, we found thatgenetic or pharmacologic inhibitionof the lipid kinase PIKfyve, a regulator of autophagic flux and lysosomal biogenesis,upregulated surface expression of major histocompatibility complex class I (MHC-I) in cancer cells via impairing autophagic flux, resulting in enhanced cancer cell killing mediated by CD8+ T cells. Genetic depletion or pharmacologic inhibition of PIKfyve elevated tumor-specific MHC-I surface expression, reduced tumor proliferation, and increased intratumoral functional CD8+T cellsinsyngeneic mouse models. Importantly, enhanced antitumor responses by Pikfyve-depletion was CD8+T cell- and MHC-I-dependent,as CD8+ T cell depletion or B2m knockout rescued tumor growth. Furthermore, PIKfyve inhibition improved response to various immunotherapies, including immune checkpoint blockade (ICB), adoptive cell therapy, and therapeutic vaccines. High expression of PIKFYVE was also predictive of poor response to ICB and prognostic of poor survival in ICB-treated cohorts. Collectively, our findings show that targeting PIKfyve enhances immunotherapies by elevating surface expression of MHC-I in cancer cells, and PIKfyve inhibitors have potential as novel agents to increase immunotherapy response in cancer patients.
2023-11-13 | GSE235945 | GEO