Project description:We investigated the role of amino acid to maintain HSC function. To identify essential amino acids for HSCs, CD34-KSL cells were cultured in single amino acids deficient medium. And cultured cells were transplanted into lethally irradiated mice. Then, the donor chimerism and lineage contribution was estimated. Surprisingly, HSC proliferation was prevented in valine and cysteine deficient medium in vitro. Donor cells cultured in these medium were also not engrafted. To elucidate the effects and influences of cysteine and valine in HSCs, we performed global gene expression profiling experiments by RNA-sequencing analysis. Gene sets categorized with cell cycle, mitosis, cell division or DNA replication were strongly down-regulated in both valine- or cysteine-depleted conditions These results imply distinctive amino-acid metabolism involved in HSC division.
Project description:We investigated the role of amino acid to maintain HSC function. To identify essential amino acids for HSCs, CD34-KSL cells were cultured in single amino acids deficient medium. And cultured cells were transplanted into lethally irradiated mice. Then, the donor chimerism and lineage contribution was estimated. Surprisingly, HSC proliferation was prevented in valine and cysteine deficient medium in vitro. Donor cells cultured in these medium were also not engrafted. To elucidate the effects and influences of cysteine and valine in HSCs, we performed global gene expression profiling experiments by RNA-sequencing analysis. Gene sets categorized with cell cycle, mitosis, cell division or DNA replication were strongly down-regulated in both valine- or cysteine-depleted conditions These results imply distinctive amino-acid metabolism involved in HSC division. Gene expression profiles of ten thousand HSCs cultured in cysteine or valine deficient medium for 24 hours were compared with that of HSCs cultured in complete medium by using RNA-sequencing analysis
Project description:First experiment: Cells were cultured in sulfur amino acid-free DMEM supplemented with 0.1 mM methionine + 0.1 mM cysteine (complete) or supplemented only with 0.1 mM methionine (cysteine-free). Cells were cultured in either medium for 42 h (Long + Cys; Long -Cys) or in cysteine-free medium for 36 h followed by 6 h in complete medium (Short +Cys) Second experiment: C3A/HepG2 cells were cultured in sulfur amino acid-free DMEM supplemented with 0.1 mM Met and 0.1 mM Cys (complete) or supplemented only with 0.1 mM Met (cysteine-devoid). Cells were cultured in complete medium for 42 h (Long +Cys) or in complete medium for 36 h followed by cysteine-devoid medium for 6 h (Short -Cys). Keywords: amino acid deprivation
Project description:First experiment: Cells were cultured in sulfur amino acid-free DMEM supplemented with 0.1 mM methionine + 0.1 mM cysteine (complete) or supplemented only with 0.1 mM methionine (cysteine-free). Cells were cultured in either medium for 42 h (Long + Cys; Long -Cys) or in cysteine-free medium for 36 h followed by 6 h in complete medium (Short +Cys); Second experiment: C3A/HepG2 cells were cultured in sulfur amino acid-free DMEM supplemented with 0.1 mM Met and 0.1 mM Cys (complete) or supplemented only with 0.1 mM Met (cysteine-devoid). Cells were cultured in complete medium for 42 h (Long +Cys) or in complete medium for 36 h followed by cysteine-devoid medium for 6 h (Short -Cys). Experiment Overall Design: First experiment: Three plates of cells were cultured under each condition. Cells were cultured in sulfur amino acid-free DMEM supplemented with 0.1 mM methionine + 0.1 mM cysteine (complete) or supplemented only with 0.1 mM methionine (cysteine-free). Cells were cultured in either medium for 42 h (Long + Cys; Long -Cys) or in cysteine-free medium for 36 h followed by 6 h in complete medium (Short +Cys). Experiment Overall Design: Second experiment: C3A/HepG2 cells were cultured in sulfur amino acid-free DMEM supplemented with 0.1 mM Met and 0.1 mM Cys (complete) or supplemented only with 0.1 mM Met (cysteine-devoid). Cells were cultured in complete medium for 42 h (Long +Cys) or in complete medium for 36 h followed by cysteine-devoid medium for 6 h (Short -Cys).
Project description:Transcription profiling by array of arabidopsis wild type and met1 mutant calli cultured on shoot induction medium for 0, 4 and 6 hours
Project description:Purpose: The goal of this study is to examine gene expression regulation at the transcriptional and translational levels in response to various forms of nutrient deprivation, and whether there are differences between isogenic transformed and non-transformed cells. Mehods: We apply high-throughput sequencing of ribosome footprints (ribosome profiling) and poly(A) RNA (RNA sequencing) in an isogenic pair of transformed (tamoxifen-treated) and non-transformed (ethanol control) MCF10A-ER-Src cells subjected to the metabolic stresses that differentially affect global protein synthesis (Figure 1): deprivation of glutamine (for 30min and 4 hours), glucose (4hours), cysteine/cystine (4hours) or leucine/isoleucine/valine (brach-chain aminoacids - BCAA) (4hours). The same experiments were also performed in transformed ER-Src MCF10A treated with torin1 (500nM) for 4 hours. Results: Genome-wide translational profiling of glutamine deprived ER-Src MCF10A cells (for 30 minutes) shows increased translation of uORFs-containing mRNAs and down-regulation of ribosomal protein mRNAs, which is followed by increased translation and transcription of cytokine and inflammatory mRNAs (after 4 hours of glutamine deprivation). The transcription and translation of inflammatory and cytokine mRNAs is also stimulated in response to 4 hours deprivation of glucose, cysteine/cystine and BCAA, with the extent of stimulation correlating with the i) decrease in global protein synthesis and ii) down-regulation of all translationally-repressed mRNAs or ribosomal protein mRNAs. Conclusions: Pro-inflammatory gene expression is associated with translational repression in response to short-term nutrient deprivation.
Project description:The transcriptome of Ctrl and Vitamin A-deficient longterm hematopoietic stem cells (LT-HSC) and multipotant progenitors (MPP3/4) was assessed by RNAseq.