Project description:While prior work in muscle cells indicates that metabolic reprogramming is associated with quiescence, whether metabolic changes occur in cancer to drive quiescence is unclear. We found that the metabolic enzyme ACSS2 is highly upregulated in quiescent ovarian cancer cells and overexpresssion of ACSS2 induces ovarian cancer quiescence.
Project description:To identify genes activated under serum starvation and hypoxia condition in an SREBP1 dependent manner, we performed cDNA microarray analysis with an ovarian cancer cell line OVSAYO.
Project description:We used microRNA microarrays (Affy miRNA 2.0 array) to compare the miRNA expression between proliferating (mock) and different time points (12, 48, 72 hours) of serum starvation (to induce quiescence) in Human Foreskin Fibroblast (HFF) cells.
Project description:Cells arrest growth and enter a quiescent state upon nutrient deprivation. However, the molecular processes by which cells respond to different starvation signals to regulate exit from the cell division cycle and initiation of quiescence remains poorly understood. To study the role of protein expression and signaling in quiescence we combined temporal profiling of the proteome and phosphoproteome using stable isotope labeling with amino acids in cell culture (SILAC) in Saccharomyces cerevisiae (budding yeast). We find that carbon and phosphorus starvation signals activate quiescence through largely distinct proteome and phosphoproteome remodeling. However, increased expression of mitochondrial proteins is essential for quiescence establishment in response to both starvation signals. Whereas the quiescent proteome is established within 6 hours of starvation the quiescent phosphoproteome undergoes continuous changes for at least 30 hours following initial starvation. Deletion of the putative quiescence regulator RIM15, which encodes a serine-threonine kinase, results in reduced survival of cells starved for phosphorus and nitrogen, but not carbon. However, we identified common protein phosphorylation roles for RIM15 in quiescence that are enriched for RNA metabolism and translation. We also find evidence for RIM15-mediated phosphorylation of some targets, including IGO1, prior to starvation consistent with a functional role for RIM15 beyond quiescence regulation. Finally, we find evidence for widespread catabolism of amino acids in response to nitrogen starvation, indicating widespread amino acid recycling via salvage pathways in conditions lacking environmental nitrogen. Our study defines an expanded quiescent proteome and phosphoproteome in yeast, and highlights the multiple coordinated molecular processes at the level of protein expression that are required for quiescence.
Project description:The study aimed to identify the differentially regulated microRNAs during serum starvation. We identified miRNAs exhibiting altered expression in asynchronous, serum starved and serum re-supplemented human cells. We identified several miRNAs that were upregulated following serum starvation and downregulated upon serum re-supplementation.
Project description:Production of cultured meat requires the robust differentiation of satellite cells into mature muscle fibers without the use of animal-derived components. Current protocols induce myogenic differentiation in vitro through serum starvation, an abrupt reduction in serum concentration. Here, we used RNA sequencing to investigate the transcriptomic remodelling of bovine satellite cells during myogenic differentiation induced by serum starvation. We characterized canonical myogenic gene expression, and identified surface receptors upregulated during the early phase of differentiation. Supplementation of ligands to these receptors enabled the formulation of a chemically defined media that induced differentiation in the absence of serum starvation and/or transgene expression. Serum-free myogenic differentiation was of similar extent to that induced by serum starvation, as evaluated by transcriptome analysis, protein expression and the presence of a functional contractile apparatus. Moreover, the serum-free differentiation media supported the fabrication of mature three-dimensional bioartificial muscle constructs, demonstrating its suitability for cultured beef production.
Project description:Production of cultured meat requires the robust differentiation of satellite cells into mature muscle fibers without the use of animal-derived components. Current protocols induce myogenic differentiation in vitro through serum starvation, an abrupt reduction in serum concentration. Here, we used RNA sequencing to investigate the transcriptomic remodelling of bovine satellite cells during myogenic differentiation induced by serum starvation. We characterized canonical myogenic gene expression, and identified surface receptors upregulated during the early phase of differentiation. Supplementation of ligands to these receptors enabled the formulation of a chemically defined media that induced differentiation in the absence of serum starvation and/or transgene expression. Serum-free myogenic differentiation was of similar extent to that induced by serum starvation, as evaluated by transcriptome analysis, protein expression and the presence of a functional contractile apparatus. Moreover, the serum-free differentiation media supported the fabrication of mature three-dimensional bioartificial muscle constructs, demonstrating its suitability for cultured beef production.
Project description:To validate prediction marker of ovarian cancer patients, comprehensive analysis of serum microRNA of ovarian cancer patients were performed.
Project description:In order to investigate the genes that might be regulated by the activating signal cointegrator 1 (ASC-1) complex we performed an expression analysis using the GeneChip® Human Gene 2.0 ST Array (Affymetrix) Since ASC-1 was predicted to have an influence on the transcription regulation by the serum response factor (SRF), we investigated gene expression after serum starvation and subsequent serum challenge.