Transcription profiling by array of human pacreatic islets prepared for clinical transplantation
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
SUBMITTER: Shane Grey
PROVIDER: E-MTAB-203 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Although hypoxia inducible factor-1a (HIF-1a) was originally identified as a transcriptional factor to adapt hypoxia, HIF-1a has also been shown to regulate metabolic pathways specific for cancer, including aerobic glycolysis, namely “Warburg effect”. However, the mechanisms by which HIF-1a mediates the metabolic pathway under normoxia are not fully understood. Here, we identified gamma-glutamylcyclotransferase (GGCT) as a novel regulator of HIF-1a. GGCT is a highly expressed protein in various cancer tissues. Knockdown of GGCT exerts anticancer effects both in vitro and in vivo; thus, it is considered a promising therapeutic target. In this study, we show that depleting GGCT downregulates the protein and mRNA expressions of HIF-1a in PC3 prostate cancer cells, and that overexpressing GGCT upregulates them in mouse fibroblast NIH3T3 cells. We also show that depleting GGCT downregulates HIF-1a downstream target genes involved in glycolysis, whereas overexpressing GGCT exhibits upregulation pattern in these genes. Furthermore, we suggest that GGCT induces the metabolic switch from citric acid cycle to glycolysis under normoxia. Additionally, we show that GGCT regulates expression of HIF-1a protein via AMPK-mTORC1-4EBP1 pathway in PC3 cells. These results indicate the GGCT plays a regulatory role in the expression of HIF-1a followed by glycolytic switch in cancer cells.
2020-07-17 | GSE154584 | GEO
Project description:Although hypoxia inducible factor-1a (HIF-1a) was originally identified as a transcriptional factor to adapt hypoxia, HIF-1a has also been shown to regulate metabolic pathways specific for cancer, including aerobic glycolysis, namely “Warburg effect”. However, the mechanisms by which HIF-1a mediates the metabolic pathway under normoxia are not fully understood. Here, we identified gamma-glutamylcyclotransferase (GGCT) as a novel regulator of HIF-1a. GGCT is a highly expressed protein in various cancer tissues. Knockdown of GGCT exerts anticancer effects both in vitro and in vivo; thus, it is considered a promising therapeutic target. In this study, we show that depleting GGCT downregulates the protein and mRNA expressions of HIF-1a in PC3 prostate cancer cells, and that overexpressing GGCT upregulates them in mouse fibroblast NIH3T3 cells. We also show that depleting GGCT downregulates HIF-1a downstream target genes involved in glycolysis, whereas overexpressing GGCT exhibits upregulation pattern in these genes. Furthermore, we suggest that GGCT induces the metabolic switch from citric acid cycle to glycolysis under normoxia. Additionally, we show that GGCT regulates expression of HIF-1a protein via AMPK-mTORC1-4EBP1 pathway in PC3 cells. These results indicate the GGCT plays a regulatory role in the expression of HIF-1a followed by glycolytic switch in cancer cells.
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Project description:The metabolic adaptation of eukaryotic cells to hypoxia involves increasing dependence upon glycolytic ATP production, an event with consequences for both cell bioenergetics and cell fate. This response is regulated at the transcriptional level by HIF-1-dependent transcriptional upregulation of all ten glycolytic enzymes. However, this response alone does not account for the levels of ATP produced in hypoxia. Here, we investigated additional mechanisms of regulating glycolysis in hypoxia. We found that both intestinal epithelial cells treated with inhibitors of transcription and translation and human platelets (which lack nuclei) maintained the capacity for hypoxia-induced glycolysis, suggesting the involvement of a non-transcriptional component to the hypoxia-induced metabolic switch to a highly glycolytic phenotype. Mass spectrometric analysis of the interactome of immunoprecipitated rate-limiting glycolytic enzymes identified hypoxia-sensitive complexes comprising multiple glycolytic enzymes and glucose transporters in intestinal epithelial cells. Surprisingly, the formation of glycolytic complexes, though not dependent upon transcription, occurs via a HIF-1?-dependent mechanism, suggesting that HIF-1? may play a moonlighting role in the formation / maintenance of glycolytic complexes. Furthermore, we provide evidence for the presence of HIF-1? in cytosolic fractions of hypoxic cells which physically associated with the glucose transporter GLUT1 and the glycolytic enzyme PFKP in a hypoxia-sensitive manner. In conclusion, we hypothesize that HIF-1? plays a role in initiation and/or maintenance of glycolytic complexes in intestinal epithelial cells under hypoxic conditions in a manner which optimizes catalytic efficiency of the pathway by facilitating substrate channeling of glycolytic intermediates between sequential pathway enzymes. In hypoxia, cells undergo a metabolic switch to increased glycolysis. This has important implications for cell behavior, phenotype, and fate in both healthy and cancerous cells. Here we describe a mechanism by which HIF-1, in addition to increasing glycolytic enzyme expression, promotes glycolysis via the formation of a metabolic complex.
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Project description:The metabolic adaptation of eukaryotic cells to hypoxia involves increasing dependence upon glycolytic ATP production, an event with consequences for both cell bioenergetics and cell fate. This response is regulated at the transcriptional level by HIF-1-dependent transcriptional upregulation of all ten glycolytic enzymes. However, this response alone does not account for the levels of ATP produced in hypoxia. Here, we investigated additional mechanisms of regulating glycolysis in hypoxia. We found that both intestinal epithelial cells treated with inhibitors of transcription and translation and human platelets (which lack nuclei) maintained the capacity for hypoxia-induced glycolysis, suggesting the involvement of a non-transcriptional component to the hypoxia-induced metabolic switch to a highly glycolytic phenotype. Mass spectrometric analysis of the interactome of immunoprecipitated rate-limiting glycolytic enzymes identified hypoxia-sensitive complexes comprising multiple glycolytic enzymes and glucose transporters in intestinal epithelial cells. Surprisingly, the formation of glycolytic complexes, though not dependent upon transcription, occurs via a HIF-1?-dependent mechanism, suggesting that HIF-1? may play a moonlighting role in the formation / maintenance of glycolytic complexes. Furthermore, we provide evidence for the presence of HIF-1? in cytosolic fractions of hypoxic cells which physically associated with the glucose transporter GLUT1 and the glycolytic enzyme PFKP in a hypoxia-sensitive manner. In conclusion, we hypothesize that HIF-1? plays a role in initiation and/or maintenance of glycolytic complexes in intestinal epithelial cells under hypoxic conditions in a manner which optimizes catalytic efficiency of the pathway by facilitating substrate channeling of glycolytic intermediates between sequential pathway enzymes. In hypoxia, cells undergo a metabolic switch to increased glycolysis. This has important implications for cell behavior, phenotype, and fate in both healthy and cancerous cells. Here we describe a mechanism by which HIF-1, in addition to increasing glycolytic enzyme expression, promotes glycolysis via the formation of a metabolic complex.
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Project description:The metabolic adaptation of eukaryotic cells to hypoxia involves increasing dependence upon glycolytic ATP production, an event with consequences for both cell bioenergetics and cell fate. This response is regulated at the transcriptional level by HIF-1-dependent transcriptional upregulation of all ten glycolytic enzymes. However, this response alone does not account for the levels of ATP produced in hypoxia. Here, we investigated additional mechanisms of regulating glycolysis in hypoxia. We found that both intestinal epithelial cells treated with inhibitors of transcription and translation and human platelets (which lack nuclei) maintained the capacity for hypoxia-induced glycolysis, suggesting the involvement of a non-transcriptional component to the hypoxia-induced metabolic switch to a highly glycolytic phenotype. Mass spectrometric analysis of the interactome of immunoprecipitated rate-limiting glycolytic enzymes identified hypoxia-sensitive complexes comprising multiple glycolytic enzymes and glucose transporters in intestinal epithelial cells. Surprisingly, the formation of glycolytic complexes, though not dependent upon transcription, occurs via a HIF-1?-dependent mechanism, suggesting that HIF-1? may play a moonlighting role in the formation / maintenance of glycolytic complexes. Furthermore, we provide evidence for the presence of HIF-1? in cytosolic fractions of hypoxic cells which physically associated with the glucose transporter GLUT1 and the glycolytic enzyme PFKP in a hypoxia-sensitive manner. In conclusion, we hypothesize that HIF-1? plays a role in initiation and/or maintenance of glycolytic complexes in intestinal epithelial cells under hypoxic conditions in a manner which optimizes catalytic efficiency of the pathway by facilitating substrate channeling of glycolytic intermediates between sequential pathway enzymes. In hypoxia, cells undergo a metabolic switch to increased glycolysis. This has important implications for cell behavior, phenotype, and fate in both healthy and cancerous cells. Here we describe a mechanism by which HIF-1, in addition to increasing glycolytic enzyme expression, promotes glycolysis via the formation of a metabolic complex.
2024-05-21 | PXD036950 | Pride
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