CBIO-05. LIPID METABOLIC REPROGRAMMING SENSITIZES A MOLECULARLY-DEFINED SUBSET OF GLIOBLASTOMAS TO FERROPTOSIS

Abstract Cancers, including the universally lethal glioblastoma (GBM), have reprogrammed lipid metabolism to fuel tumor growth. However, the molecular alterations responsible for aberrant lipid metabolism, and the potential for identifying new therapeutic opportunities are not fully understood. To systematically investigate the GBM lipidome, we performed integrated transcriptomic, genomic and shotgun lipidomic analysis of an extensive library of molecularly diverse patient-derived GBM samples. Using this comprehensive approach, we discovered two GBM sub-groups defined by their combined molecular and lipidomic profile. Triacylglycerides (TAGs) enriched in polyunsaturated fatty acids (PUFAs) were among the most significantly altered lipids between the two groups of GBM tumors. TAGs are the main components of lipid droplets, which sequester PUFA-TAGs away from membrane phospholipids where their peroxidation can lead to ferroptosis – a regulated from of PUFA-peroxidation dependent cell death. Accordingly, the GBM subgroup with a depletion of PUFA TAGs showed heightened sensitivity to ferroptosis. Our findings suggest a novel association between specific molecular signatures of GBM, lipid metabolism and ferroptosis. This relationship may present a new therapeutic opportunity to target reprogrammed lipid metabolism in a molecularly-defined subset of GBMs.

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CBMT-43. INTEGRATED LIPIDOMIC AND MOLECULAR ANALYSIS REVEALS A SUBSET OF GLIOBLASTOMA VULNERABLE TO FERROPTOSIS

Neuro-Oncology ◽

10.1093/neuonc/noz175.165 ◽

2019 ◽

Vol 21 (Supplement_6) ◽

pp. vi42-vi42

Author(s):

Danielle Morrow ◽

Nicholas Bayley ◽

Kevin Williams ◽

Hayato Muranaka ◽

Robert Prins ◽

...

Keyword(s):

Fatty Acids ◽

Lipid Metabolism ◽

Metabolic Phenotype ◽

Molecular Signatures ◽

Critical Feature ◽

Molecular Alterations ◽

Lipidomic Analysis ◽

Regulated Cell Death ◽

Novel Association ◽

Therapeutic Opportunity

Abstract Cancers, including the universally lethal glioblastoma (GBM), have reprogrammed lipid metabolism to fuel tumor growth. However, the molecular alterations responsible for aberrant lipid metabolism, and the potential for identifying new therapeutic opportunities are not fully understood. To systematically investigate the GBM lipidome, we performed integrated transcriptomic, genomic and shotgun lipidomic analysis of a library of molecularly diverse patient-derived GBM cells (n=30). Using this comprehensive approach, we discovered two GBM sub-groups defined by their combined molecular and lipidomic profile. Polyunsaturated fatty acids (PUFAs) were among the most significant lipids that distinguished these two groups of GBM tumors. Intriguingly, this lipid metabolic phenotype was associated with heightened sensitivity to ferroptosis – a newly discovered form of regulated cell death. As PUFA oxidation is a critical feature of ferroptosis, our findings suggest a novel association between specific molecular signatures of GBM, lipid metabolism and ferroptosis. This relationship may present a new therapeutic opportunity to target ferroptosis in a molecularly-defined subset of GBMs.

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CBIO-03. A COMPREHENSIVE CHARACTERIZATION OF THE GBM LIPIDOME REVEALS A MOLECULARLY-DEFINED SUB-GROUP WITH HEIGHTENED SENSITIVITY TO FERROPTOSIS

Neuro-Oncology ◽

10.1093/neuonc/noab196.104 ◽

2021 ◽

Vol 23 (Supplement_6) ◽

pp. vi27-vi27

Author(s):

Danielle Morrow ◽

Jenna Minami ◽

Nicholas Bayley ◽

Kevin Williams ◽

Robert Prins ◽

...

Keyword(s):

Lipid Peroxidation ◽

Lipid Metabolism ◽

Model Systems ◽

Molecular Signatures ◽

Molecular Alterations ◽

Lipidomic Analysis ◽

Novel Association ◽

Therapeutic Opportunity ◽

Comprehensive Characterization

Abstract Cancers, including the universally lethal glioblastoma (GBM), have reprogrammed lipid metabolism to fuel tumor growth. However, the molecular alterations responsible for aberrant lipid metabolism, and the potential for identifying new therapeutic opportunities are not fully understood. To systematically investigate the GBM lipidome, we performed integrated transcriptomic, genomic and shotgun lipidomic analysis of an extensive library of molecularly diverse patient-derived GBM tumors and model systems. Using this comprehensive approach, we discovered two GBM sub-groups defined by their combined molecular and lipidomic profile. Among the most significant differences between the two groups were lipid length and desaturation. As a consequence of this signature, a subset was more sensitive to lipid peroxidation and ferroptosis. Our findings suggest a novel association between specific molecular signatures of GBM, lipid metabolism and lipid peroxidation-induced cell death. This relationship may present a new therapeutic opportunity to target reprogrammed lipid metabolism in a molecularly-defined subset of GBMs.

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DDRE-23. A COMPREHENSIVE CHARACTERIZATION OF THE GBM LIPIDOME REVEALS A MOLECULARLY-DEFINED SUB-GROUP WITH HEIGHTENED SENSITIVITY TO LIPID PEROXIDATION INDUCED CELL DEATH

Neuro-Oncology Advances ◽

10.1093/noajnl/vdab024.045 ◽

2021 ◽

Vol 3 (Supplement_1) ◽

pp. i11-i11

Author(s):

Danielle Morrow ◽

Jenna Minami ◽

Nicholas Bayley ◽

Kevin Williams ◽

Steven Bensinger ◽

...

Keyword(s):

Lipid Peroxidation ◽

Cell Death ◽

Lipid Metabolism ◽

Membrane Phospholipids ◽

Molecular Alterations ◽

Tumor Microenvironments ◽

Novel Association ◽

Therapeutic Opportunity

Abstract Cancers, including the universally lethal glioblastoma (GBM), have reprogrammed lipid metabolism to fuel tumor growth and promote survival. However, the full extent to which lipid content is altered across molecularly heterogeneous patient tumors has yet to be fully elucidated. Additionally, the molecular alterations responsible for aberrant lipid metabolism, and the potential for identifying new therapeutic opportunities are not fully understood. To systematically investigate the GBM lipidome, we performed integrated transcriptomic, genomic and shotgun lipidomic analysis of an extensive library of molecularly diverse patient-derived GBM tumors across tumor microenvironments both in vivo (n=23) and in vitro (n=30). Using this comprehensive approach, we discovered two GBM sub-groups defined by their combined molecular and lipidomic profile. Triacylglycerides (TAGs) enriched in polyunsaturated fatty acids (PUFAs) were among the most significantly altered lipids between the two groups of GBM tumors. TAGs are the main components of lipid droplets, which have been shown to sequester PUFAs away from membrane phospholipids where their sensitivity to peroxidation leads to cell death. The GBM subgroup with a depletion of PUFA TAGs showed heightened sensitivity to lipid peroxidation both under basal conditions and in response to pro-oxidant compounds in vitro. Our findings suggest a novel association between specific molecular signatures of GBM, lipid metabolism and lipid peroxidation-induced cell death. This relationship may present a new therapeutic opportunity to target reprogrammed lipid metabolism in a molecularly-defined subset of GBMs.

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Autophagy is required for lipid homeostasis during dark-induced senescence in Arabidopsis

10.1101/2020.08.10.245092 ◽

2020 ◽

Author(s):

Jessica AS Barros ◽

Sahar Magen ◽

Taly Lapidot-Cohen ◽

Leah Rosental ◽

Yariv Brotman ◽

...

Keyword(s):

Arabidopsis Thaliana ◽

Lipid Metabolism ◽

Lipid Droplets ◽

Metabolic Reprogramming ◽

Eukaryotic Cells ◽

Lipid Homeostasis ◽

Evolutionarily Conserved ◽

Altered Lipid ◽

Starvation Conditions

Autophagy is an evolutionarily conserved mechanism that mediates the degradation of cytoplasmic components in eukaryotic cells. In plants, autophagy has been extensively associated with the recycling of proteins during carbon starvation conditions. Even tough lipids constitute a significant energy reserve, our understanding of the function of autophagy in the management of cell lipid reserves and components remains fragmented. To further investigate the significance of autophagy in lipid metabolism, we performed an extensive lipidomic characterization of Arabidopsis (Arabidopsis thaliana) autophagy mutants (atg) submitted to dark-induced senescence conditions. Our results revealed an altered lipid profile in atg mutants, suggesting that autophagy affects the homeostasis of multiple lipid components under dark-induced senescence. The acute degradation of chloroplast lipids coupled with the differential accumulation of triacylglycerols (TAGs) and plastoglobuli-related transcripts indicates an alternative metabolic reprogramming towards lipid storage in atg mutants. The imbalance of lipid metabolism compromises the production of cytosolic lipid droplets and the regulation of peroxisomal lipid oxidation pathways in atg mutants.

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Regulation of Metabolic Reprogramming by Long Non-Coding RNAs in Cancer

Cancers ◽

10.3390/cancers13143485 ◽

2021 ◽

Vol 13 (14) ◽

pp. 3485

Author(s):

Assunta Sellitto ◽

Giovanni Pecoraro ◽

Giorgio Giurato ◽

Giovanni Nassa ◽

Francesca Rizzo ◽

...

Keyword(s):

Lipid Metabolism ◽

Cancer Cells ◽

Metabolic Reprogramming ◽

Metabolic Phenotype ◽

Metabolic Alterations ◽

Cell Proliferation And Differentiation ◽

Non Coding Rna ◽

Proliferation And Differentiation ◽

Non Coding Rnas ◽

Additional Level

Metabolic reprogramming is a well described hallmark of cancer. Oncogenic stimuli and the microenvironment shape the metabolic phenotype of cancer cells, causing pathological modifications of carbohydrate, amino acid and lipid metabolism that support the uncontrolled growth and proliferation of cancer cells. Conversely, metabolic alterations in cancer can drive changes in genetic programs affecting cell proliferation and differentiation. In recent years, the role of non-coding RNAs in metabolic reprogramming in cancer has been extensively studied. Here, we review this topic, with a focus on glucose, glutamine, and lipid metabolism and point to some evidence that metabolic alterations occurring in cancer can drive changes in non-coding RNA expression, thus adding an additional level of complexity in the relationship between metabolism and genetic programs in cancer cells.

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The complex of phosphatidylinositol 4,5-bisphosphate and calcium ions is not responsible for Ca(2+)-induced loss of phospholipid asymmetry in the human erythrocyte: a study in Scott syndrome, a disorder of calcium- induced phospholipid scrambling

Blood ◽

10.1182/blood.v86.5.1983.bloodjournal8651983 ◽

1995 ◽

Vol 86 (5) ◽

pp. 1983-1991 ◽

Cited By ~ 33

Author(s):

EM Bevers ◽

T Wiedmer ◽

P Comfurius ◽

J Zhao ◽

EF Smeets ◽

...

Keyword(s):

Lipid Vesicles ◽

Human Erythrocytes ◽

Mechanism Analysis ◽

Membrane Phospholipids ◽

Mole Percent ◽

Cellular Processes ◽

Phospholipid Asymmetry ◽

Dependent Cell ◽

Normal Human ◽

State Concentration

Elevation of cytoplasmic Ca2+ levels in human erythrocytes induces a progressive loss of membrane phospholipid asymmetry, a process that is impaired in erythrocytes from a patient with Scott syndrome. We show here that porcine erythrocytes are similarly incapable of Ca(2+)- induced redistribution of membrane phospholipids. Because a complex of phosphatidylinositol 4,5-bisphosphate (PIP2) and Ca2+ has been proposed as the mediator of enhanced transbilayer movement of lipids (J Biol Chem 269:6347,1994), these cell systems offer a unique opportunity for testing this mechanism. Analysis of both total PIP2 content and the metabolic-resistant pool of PIP2 that remains after incubation with Ca2+ ionophore showed no appreciable differences between normal and Scott erythrocytes. Moreover, porcine erythrocytes were found to have slightly higher levels of both total and metabolic-resistant PIP2 in comparison with normal human erythrocytes. Although loading of normal erythrocytes with exogenously added PIP2 gave rise to a Ca(2+)-induced increase in prothrombinase activity and apparent transbilayer movement of nitrobenzoxadiazolyl (NBD)-phospholipids, these PIP2-loaded cells were also found to undergo progressive Ca(2+)-dependent cell lysis, which seriously hampers interpretation of these data. Moreover, loading Scott cells with PIP2 did not abolish their impaired lipid scrambling, even in the presence of a Ca(2+)-ionophore. Finally, artificial lipid vesicles containing no PIP2 or 1 mole percent of PIP2 were indistinguishable with respect to transbilayer movement of NBD- phosphatidylcholine in the presence of Ca2+. Our findings suggest that Ca(2+)-induced redistribution of membrane phospholipids cannot simply be attributed to the steady-state concentration of PIP2, and imply that such lipid movement is regulated by other cellular processes.

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Epithelial–Mesenchymal Transition (EMT) Induced by TGF-β in Hepatocellular Carcinoma Cells Reprograms Lipid Metabolism

International Journal of Molecular Sciences ◽

10.3390/ijms22115543 ◽

2021 ◽

Vol 22 (11) ◽

pp. 5543

Author(s):

Jitka Soukupova ◽

Andrea Malfettone ◽

Esther Bertran ◽

María Isabel Hernández-Alvarez ◽

Irene Peñuelas-Haro ◽

...

Keyword(s):

Hepatocellular Carcinoma ◽

Lipid Metabolism ◽

Transforming Growth Factor ◽

Epithelial Mesenchymal Transition ◽

Aerobic Glycolysis ◽

Metabolic Reprogramming ◽

Migration And Invasion ◽

Metabolic Switch ◽

Mesenchymal Transition ◽

Hcc Cells

(1) Background: The transforming growth factor (TGF)-β plays a dual role in liver carcinogenesis. At early stages, it inhibits cell growth and induces apoptosis. However, TGF-β expression is high in advanced stages of hepatocellular carcinoma (HCC) and cells become resistant to TGF-β induced suppressor effects, responding to this cytokine undergoing epithelial–mesenchymal transition (EMT), which contributes to cell migration and invasion. Metabolic reprogramming has been established as a key hallmark of cancer. However, to consider metabolism as a therapeutic target in HCC, it is necessary to obtain a better understanding of how reprogramming occurs, which are the factors that regulate it, and how to identify the situation in a patient. Accordingly, in this work we aimed to analyze whether a process of full EMT induced by TGF-β in HCC cells induces metabolic reprogramming. (2) Methods: In vitro analysis in HCC cell lines, metabolomics and transcriptomics. (3) Results: Our findings indicate a differential metabolic switch in response to TGF-β when the HCC cells undergo a full EMT, which would favor lipolysis, increased transport and utilization of free fatty acids (FFA), decreased aerobic glycolysis and an increase in mitochondrial oxidative metabolism. (4) Conclusions: EMT induced by TGF-β in HCC cells reprograms lipid metabolism to facilitate the utilization of FFA and the entry of acetyl-CoA into the TCA cycle, to sustain the elevated requirements of energy linked to this process.

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Regulation of Osteoclast Differentiation and Activity by Lipid Metabolism

Cells ◽

10.3390/cells10010089 ◽

2021 ◽

Vol 10 (1) ◽

pp. 89

Author(s):

Haemin Kim ◽

Brian Oh ◽

Kyung-Hyun Park-Min

Keyword(s):

Lipid Metabolism ◽

Molecular Mechanisms ◽

Bone Cells ◽

Critical Role ◽

Osteoclast Differentiation ◽

Bone Diseases ◽

Metabolic Reprogramming ◽

Lipid Lowering ◽

Metabolic Bone Diseases ◽

Increased Risk

Bone is a dynamic tissue and is constantly being remodeled by bone cells. Metabolic reprogramming plays a critical role in the activation of these bone cells and skeletal metabolism, which fulfills the energy demand for bone remodeling. Among various metabolic pathways, the importance of lipid metabolism in bone cells has long been appreciated. More recent studies also establish the link between bone loss and lipid-altering conditions—such as atherosclerotic vascular disease, hyperlipidemia, and obesity—and uncover the detrimental effect of fat accumulation on skeletal homeostasis and increased risk of fracture. Targeting lipid metabolism with statin, a lipid-lowering drug, has been shown to improve bone density and quality in metabolic bone diseases. However, the molecular mechanisms of lipid-mediated regulation in osteoclasts are not completely understood. Thus, a better understanding of lipid metabolism in osteoclasts can be used to harness bone cell activity to treat pathological bone disorders. This review summarizes the recent developments of the contribution of lipid metabolism to the function and phenotype of osteoclasts.

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193 Single Cell RNA-sequencing Reveals a Role of Lipid Metabolism in Muscle Satellite Cells

Journal of Animal Science ◽

10.1093/jas/skab235.189 ◽

2021 ◽

Vol 99 (Supplement_3) ◽

pp. 104-105

Author(s):

Shihuan Kuang ◽

Feng Yue ◽

Stephanie Oprescu

Keyword(s):

Gene Expression ◽

Lipid Metabolism ◽

Cell Fate ◽

Satellite Cell ◽

Satellite Cells ◽

Lipid Droplets ◽

Self Renewal ◽

Droplet Dynamics ◽

Single Cell Rna Sequencing

Abstract Single Cell RNA-sequencing (scRNA-seq) is a powerful technique to deconvolute gene expression of various subset of cells intermingled within a complex tissue, such as the skeletal muscle. We first used scRNA-seq to understand dynamics of cell populations and their gene expression during muscle regeneration in murine limb muscles. This leads to the identification of a subset of satellite cells (the resident stem cells of skeletal muscles) with immune gene signatures in regenerating muscles. Next, we used scRNA-seq to examine gene expression dynamics of satellite cells at various status: quiescence, activation, proliferation, differentiation and self-renewal. This analysis uncovers stage-dependent changes in expression of genes related to lipid metabolism. Further analyses lead to the discovery of previously unappreciated dynamics of lipid droplets in satellite cells; and demonstrate that the abundance of the lipid droplets in newly divided satellite daughter cells is linked to cell fate segregation into differentiation versus self-renewal. Perturbation of lipid droplet dynamics through blocking lipolysis disrupts cell fate homeostasis and impairs muscle regeneration. Finally, we show that lipid metabolism regulates the function of satellite cells through two mechanisms. On one hand, lipid metabolism functions as an energy source through fatty acid oxidation (FAO), and blockage of FAO reduces energy production that is critical for satellite cell function. On the other hand, lipid metabolism generates bioactive molecules that influence signaling transduction and gene expression. In this scenario, lipid metabolism and FAO regulate the intracellular levels of acetyl-coA and selective acetylation of PAX7, a pivotal transcriptional factor underlying function of satellite cells. These results together reveal for the first time a critical role of lipid metabolism and lipid droplet dynamics in muscle satellite cell fate determination and regenerative function; and underscore a potential role of dietary fatty acids in satellite cell-dependent muscle development, growth and regeneration.

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Knockdown of PGM1 Synergistically Enhances Anticancer Effects of Orlistat in Gastric Cancer Under Glucose Deprivation

10.21203/rs.3.rs-650761/v1 ◽

2021 ◽

Author(s):

Bo Cao ◽

Huan Deng ◽

Hao Cui ◽

Ruiyang Zhao ◽

Hanghang Li ◽

...

Keyword(s):

Gastric Cancer ◽

Cell Proliferation ◽

Lipid Metabolism ◽

Fatty Acid Synthase ◽

Enrichment Analysis ◽

Glucose Deprivation ◽

Metabolic Reprogramming ◽

The Cancer Genome Atlas

Abstract Background Phosphoglucomutase 1 (PGM1) acts as an important regulator in glucose metabolism. However, the role of PGM1 in gastric cancer (GC) remains unclear. This study aims to investigate the role of PGM1 and develop novel regimens based on metabolic reprogramming in GC. MethodsCorrelation and enrichment analysis of PGM1 was conducted based on The Cancer Genome Atlas database. Data derived from the Kaplan-Meier Plotter database were analyzed for correlations between PGM1 expression and survival time of GC patients. CCK-8, EdU, flow cytometry assays, generation of subcutaneous tumor and lung metastasis mouse models were used to determine growth and metastasis in vitro and in vivo. Cell glycolysis was detected by a battery of glycolytic indicators, including lactate, pyruvic acid, ATP production and glucose uptake. Fatty Acid Synthase (FASN) activity and detection of lipid regulators levels by western blot were used to reflect on the cell lipid metabolism. ResultsCorrelation and enrichment analysis suggested that PGM1 was closely associated with cell proliferation and metabolism. PGM1 was overexpressed in GC tissues and cell lines. High PGM1 expression served as an indicator of shorter survival for specific subpopulation of GC patients, which was also correlated with some clinicopathological features, including T stage and TNM stage. Under low glucose conditions, knockdown of PGM1 significantly suppressed cell proliferation and glycolysis levels, whereas lipid metabolism was enhanced. Orlistat, as a drug that was designed to inhibit FASN activity for obesity treatment, effectively induced apoptosis, suppressed FASN activity. However, orlistat conversely increased glycolytic levels in GC cells. Orlistat exhibited more significant inhibitive effects on GC progression after knockdown of PGM1 under glucose deprivation due to combination of glycolysis and lipid metabolism. ConclusionsDownregulation of PGM1 expression under glucose deprivation synergistically enhanced anti-cancer effects of orlistat. This combination application may serve as a novel strategy for GC treatment.

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