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Response to salt stress of Raptor mutants

ABSTRACT: ra12-03_raptor-nacl - Characterization to raptor mutants (partner of the kinase TOR) and of their answer to the salt stress. - Sowing on metal grids on MS/2 medium with continuous light. Transfer after 12 days of culture for 3h to liquid MS/2 medium containing or not 200 mM NaCl.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE47391 | GEO | 2013/07/01

SECONDARY ACCESSION(S): PRJNA209338

REPOSITORIES: GEO

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Response to salt stress of Raptor mutants

Project description:ra12-03_raptor-nacl - Characterization to raptor mutants (partner of the kinase TOR) and of their answer to the salt stress. - Sowing on metal grids on MS/2 medium with continuous light. Transfer after 12 days of culture for 3h to liquid MS/2 medium containing or not 200 mM NaCl. 7 dye-swap - gene knock out, treated vs untreated comparison

2013-07-01 | E-GEOD-47391 | biostudies-arrayexpress

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Raptor/mTORC1-dependent metabolic programming of exit from quiescence underlies T cell activation and fate decisions

Project description:Naïve T cells respond to antigen stimulation by exiting from quiescence into clonal expansion and functional differentiation, but the control mechanism is elusive. Here we describe that Raptor/mTORC1-dependent metabolic reprogramming is a central determinant of this transitional process. Loss of Raptor abrogates T cell priming and Th2 cell differentiation, although Raptor function is less important for continuous proliferation of actively cycling cells. mTORC1 coordinates multiple metabolic programs in T cells including glycolysis, lipid synthesis and oxidative phosphorylation to mediate antigen-triggered exit from quiescence. mTORC1 further links glucose metabolism to the initiation of Th2 differentiation by orchestrating cytokine receptor expression and cytokine responsiveness. Activation of Raptor/mTORC1 integrates T cell receptor (TCR) and CD28 co-stimulatory signals in antigen-stimulated T cells. Our studies identify a Raptor/mTORC1-dependent pathway linking signal-dependent metabolic reprogramming to quiescence exit, and this in turn coordinates lymphocyte activation and fate decisions in adaptive immunity. We used microarrays to explore the gene expression profiles differentially expressed in CD4+ T-cells from wild-type (WT) and CD4(cre) x Raptor(fl/fl) mice before and after stimulation with anti CD3/CD28 antibodies.

2014-01-27 | E-GEOD-51668 | biostudies-arrayexpress

Gene-expression changes resulting from loss of the mTORC1 component Raptor in murine hematopoietic stem and progenitor cell-enriched populations (HSPC)

Project description:We investigated the role of mTORC1 in murine hematopoiesis by conditionally deleting the Raptor gene in murine hematopoietic stem cells. We observed mutliple alterations evoked by Raptor loss in hematopoiesis and profiled gene-expression alterations induced by raptor loss in Flt3-Lin-Sca1+cKit+ hematopoietic stem and progenitor enriched cell populations, 5 weeks post Raptor deletion. Flt3-Lin-Sca1+cKit+ cells were flow sorted from mice containing homozygous floxed alleles for exon 6 of the Raptor gene in the presence (MT group) or absence (WT group) of the MxCre transgene, which was induced with injections of mice with pIpC 5 weeks before cell isolation.

2012-09-19 | E-GEOD-32265 | biostudies-arrayexpress

Gene-expression changes resulting from loss of the mTORC1 component Raptor in murine hematopoietic stem and progenitor cell-enriched populations (HSPC)

2012-09-19 | GSE32265 | GEO

Ribosome profiling of metformin treatment in primary murine hepatocytes in WT, Raptor Ser-Ala mutant, Tsc2-null, Raptor mutant;Tsc2-null, and Ampk-null cells

Project description:Despite being the frontline therapy for Type 2 diabetes, the mechanisms of action of the biguanide drug metformin are still being discovered. In particular, the detailed molecular interplays between the AMPK and the mTORC1 pathway in the hepatic benefits of metformin are still ill-defined. Metformin-dependent activation of AMPK classically inhibits mTORC1 via TSC/RHEB. But several lines of evidence suggest additional mechanisms at play in metformin inhibition of mTORC1. Here we investigated the role of direct AMPK-mediated serine phosphorylation of RAPTOR in a new RaptorAA mouse model, in which AMPK phospho-serine sites Ser722 and Ser792 of RAPTOR were mutated to alanine. Metformin treatment of primary hepatocytes and intact murine liver requires AMPK regulation of both RAPTOR and TSC2 to fully inhibit mTORC1, and this regulation is critical for the translational response to metformin.

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Raptor/mTORC1-dependent metabolic programming of exit from quiescence underlies T cell activation and fate decisions

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bac2 mutant transcriptome modification during osmotic stress

Project description:rs08-05_bac2 - bac2-catma - We are studying the function of a gene encoding a mitochondrial basic amino acid carrier , BAC2 in Arabdopsis thaliana.This gene is expressed during osmotic and salt stresses, and dark-induced senescence. We wish to determine whether there are transcriptome modifications during osmotic stress in mutant plants (bac2) compared to wild-type plants . - Mutant and Wild-type plants were grown on grids for 7 days on plates containing MS/2 and saccharose. Plants were transferred for 24h to liquid medium containing MS/2 saccharose (untreated plants) or 0.4M mannitol MS/2 saccharose (treated plants). Keywords: gene knock out,treated vs untreated comparison,wt vs mutant comparison

2009-10-01 | GSE15063 | GEO

RNA-seq of metformin treatment in primary murine hepatocytes in WT, Raptor Ser-Ala mutant, Tsc2-null, Raptor mutant;Tsc2-null, and Ampk-null cells

2023-08-10 | GSE157048 | GEO

RNA-seq of metformin treatment in liver in WT, Raptor Ser-Ala mutant, Tsc2-null, Raptor mutant;Tsc2-null, and Ampk-null

Project description:Despite being the frontline therapy for Type 2 diabetes, the mechanisms of action of the biguanide drug metformin are still being discovered. In particular, the detailed molecular interplays between the AMPK and the mTORC1 pathway in the hepatic benefits of metformin are still ill-defined. Metformin-dependent activation of AMPK classically inhibits mTORC1 via TSC/RHEB. But several lines of evidence suggest additional mechanisms at play in metformin inhibition of mTORC1. Here we investigated the role of direct AMPK-mediated serine phosphorylation of RAPTOR in a new RaptorAA mouse model, in which AMPK phospho-serine sites Ser722 and Ser792 of RAPTOR were mutated to alanine. Metformin treatment of intact murine liver requires AMPK regulation of both RAPTOR and TSC2 to fully inhibit mTORC1, and this regulation is critical for the transcriptional response to metformin. Transcriptionally, AMPK and mTORC1 were both important for regulation of anabolic metabolism and inflammatory programs triggered by metformin treatment. The hepatic transcriptional response in mice on high fat diet treated with metformin was largely ablated by AMPK-deficiency under the conditions examined, indicating the essential role of this kinase and its targets in metformin action in vivo.

2023-08-10 | GSE157049 | GEO

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