PLPP1-deficiency-mediated ferroptosis induced by PD-1 signaling impairs antitumor activity of intratumoral CD8+ T cells II
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE261644 | GEO | 2024/03/19
REPOSITORIES: GEO
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Project description:Metabolic programming plays a crucial role in T-cell activation. Herein, we describe how phospholipid metabolism regulates CD8+ T-cell function in patients with cancer. We found that phosphatidylcholine (PC) and phosphatidyl ethanolamine (PE) levels were lower in intratumoral CD8+ T cells than in circulating CD8+ T cells. The expression of phospholipid phosphatase 1 (PLPP1), an enzyme that catalyzes PE and PC synthesis, was also downregulated in CD8+ T cells upon infiltrating tumors. Moreover, unsaturated fatty acid-mediated ferroptosis was a major factor impairing the antitumor function of PLPP1-deficient CD8+ T cells infiltrated in tumors, accompanied by enhanced reactive oxygen species production and lipid peroxidation. The activation of programmed cell death 1 (PD-1) signaling in CD8+ T cells suppressed the PLPP1 expression by increasing GATA1 binding to the promoter region of PLPP1. PLPP1 expression was upregulated after anti-PD-1 therapy. Our findings revealed therapeutic potential of enhancing PLPP1 levels to restore CD8+ T-cell function.
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2015-06-26 | GSE65353 | GEO
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2015-06-26 | GSE65352 | GEO
Project description:The total abundance of phosphatidylcholine (PC) is known to influence lipoprotein production. However, the role of specific phospholipid species in lipid transport has been difficult to assess due to an inability to selectively manipulate membrane composition in vivo. Here we show that the LXR-regulated phospholipid remodeling enzyme lysophosphatidylcholine acyltransferase 3 (Lpcat3) is a critical determinant of membrane phospholipid composition and lipoprotein production. Mice lacking Lpcat3 in the liver show defects in lipoprotein production. The objective of generating this dataset was to analyze the effects of Lpcat3 loss of function on gene expression in mouse liver with a western diet challenge. This dataset compares gene expression in Lpcat3fl/fl and Lpcat3fl/fl Albumin-Cre liver samples from 16-week old male mice that were fed a western diet for 9 weeks since 7 weeks old. Each sample contains tissues from 5 mice.
2015-06-26 | E-GEOD-65353 | biostudies-arrayexpress
Project description:Lipid transfer proteins of the Ups1/PRELID1 family facilitate the transport of phospholipids across the intermembrane space of mitochondria in a lipid-specific manner. Heterodimeric complexes of yeast Ups1/Mdm35 or human PRELID1/TRIAP1 shuttle phosphatidic acid (PA) synthesized in the endoplasmic reticulum (ER) to the inner membrane, where it is converted to cardiolipin (CL), the signature phospholipid of mitochondria. Loss of Ups1/PRELID1 proteins impairs the accumulation of CL and broadly affects mitochondrial structure and function. Unexpectedly and unlike yeast cells lacking the cardiolipin synthase Crd1, Ups1 deficient yeast cells exhibit glycolytic growth defects, pointing to functions of Ups1-mediated PA transfer beyond CL synthesis. Here, we show that the disturbed intramitochondrial transport of PA in ups1D cells leads to altered phospholipid composition of the ER membrane, independent of disturbances in CL synthesis. The impaired flux of PA into mitochondria is associated with the increased synthesis of phosphatidylcholine (PC) and a reduced phosphatidylethanolamine (PE)/PC ratio in the ER of ups1D cells which suppresses the unfolded protein response (UPR). Moreover, we observed inhibition of TORC1 signaling in these cells. Activation of either UPR by ER protein stress or of TORC1 signaling by disruption of its negative regulator, the SEACIT complex, increased cytosolic protein synthesis and restored glycolytic growth of ups1D cells. These results demonstrate that PA influx into mitochondria is required to preserve ER membrane homeostasis and that its disturbance is associated with impaired glycolytic growth and cellular stress signaling.
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Project description:Sen2013 - Phospholipid Synthesis in P.knowlesi
The model describes the multiple phospholipid synthetic pathways in Plasmodium knowlesi.
This model is described in the article:
Kinetic modelling of phospholipid synthesis in Plasmodium knowlesi unravels crucial steps and relative importance of multiple pathways.
Sen P, Vial HJ, Radulescu O.
BMC Syst Biol 2013 Nov; 7(1): 123
Abstract:
BACKGROUND: Plasmodium is the causal parasite of malaria, infectious disease responsible for the death of up to one million people each year. Glycerophospholipid and consequently membrane biosynthesis are essential for the survival of the parasite and are targeted by a new class of antimalarial drugs developed in our lab. In order to understand the highly redundant phospholipid synthethic pathways and eventual mechanism of resistance to various drugs, an organism specific kinetic model of these metabolic pathways need to be developed in Plasmodium species. RESULTS: Fluxomic data were used to build a quantitative kinetic model of glycerophospholipid pathways in Plasmodium knowlesi. In vitro incorporation dynamics of phospholipids unravels multiple synthetic pathways. A detailed metabolic network with values of the kinetic parameters (maximum rates and Michaelis constants) has been built. In order to obtain a global search in the parameter space, we have designed a hybrid, discrete and continuous, optimization method. Discrete parameters were used to sample the cone of admissible fluxes, whereas the continuous Michaelis and maximum rates constants were obtained by local minimization of an objective function.The model was used to predict the distribution of fluxes within the network of various metabolic precursors.The quantitative analysis was used to understand eventual links between different pathways. The major source of phosphatidylcholine (PC) is the CDP-choline Kennedy pathway.In silico knock-out experiments showed comparable importance of phosphoethanolamine-N-methyltransferase (PMT) and phosphatidylethanolamine-N-methyltransferase (PEMT) for PC synthesis.The flux values indicate that, major part of serine derived phosphatidylethanolamine (PE) is formed via serine decarboxylation, whereas major part of phosphatidylserine (PS) is formed by base-exchange reactions.Sensitivity analysis of CDP-choline pathway shows that the carrier-mediated choline entry into the parasite and the phosphocholine cytidylyltransferase reaction have the largest sensitivity coefficients in this pathway, but does not distinguish a reaction as an unique rate-limiting step.
CONCLUSION: We provide a fully parametrized kinetic model for the multiple phospholipid synthetic pathways in P. knowlesi. This model has been used to clarify the relative importance of the various reactions in these metabolic pathways. Future work extensions of this modelling strategy will serve to elucidate the regulatory mechanisms governing the development of Plasmodium during its blood stages, as well as the mechanisms of action of drugs on membrane biosynthetic pathways and eventual mechanisms of resistance.
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2013-11-25 | BIOMD0000000495 | BioModels