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Express data from Du145 cells

ABSTRACT: The retinoblastoma (Rb) tumor suppressor is often inactivated in cancers. To identify genes that can be used to specifically target such cancers, we carried out a genetic screen in Drosophila. We identified gig (fly TSC2) and found that inactivation of rbf (fly Rb) and gig synergistically induced cell death. Interestingly, inactivation of TSC2 specifically kills Rb mutant cancer cells under stress conditions, which is correlated with an inhibition of tumor growth. We show that cancer cell killing induced by concomitant inactivation of Rb and TSC2 is mediated by increased cellular stress, including oxidative stress. Inactivation of TSC2 and Rb synergistically induce oxidative stress via increased protein synthesis, inhibited de novo lipid synthesis, and decreased ROS scavenger enzyme SOD2 induction. Du145 was treated by shTSC2 or control, and then cultured in hypoxic conditions for 24h, and finally the total RNA was collected for microarray analysis.

ORGANISM(S): Homo sapiens

SUBMITTER: Wei Du

PROVIDER: E-GEOD-21147 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Express data from Du145 cells

Project description:The retinoblastoma (Rb) tumor suppressor is often inactivated in cancers. To identify genes that can be used to specifically target such cancers, we carried out a genetic screen in Drosophila. We identified gig (fly TSC2) and found that inactivation of rbf (fly Rb) and gig synergistically induced cell death. Interestingly, inactivation of TSC2 specifically kills Rb mutant cancer cells under stress conditions, which is correlated with an inhibition of tumor growth. We show that cancer cell killing induced by concomitant inactivation of Rb and TSC2 is mediated by increased cellular stress, including oxidative stress. Inactivation of TSC2 and Rb synergistically induce oxidative stress via increased protein synthesis, inhibited de novo lipid synthesis, and decreased ROS scavenger enzyme SOD2 induction.

2010-04-03 | GSE21147 | GEO

Expression data from mouse adult fibroblasts with Rb deletion and/or p53DD expression exposed to cisplatin (CDDP)

Project description:The RB and p53 tumor suppressor pathways regulate the transcription of genes involved in cell cycle progression, DNA replication, DNA repair, and apoptosis. These tumor suppressors are critical modulators of the response to genotoxic damage and both pathways are frequently inactivated in human cancers. We used microarrays to monitor gene expression patterns upon exposure to cisplatin treatment in fibroblasts harboring loss/inactivation of RB and/or p53. We generated mouse adult fibroblasts harboring loss/inactivation of RB and/or p53 and subjected these cell populations to cisplatin treatment for 24 hours. Treated cell populations were allowed to recover from cisplatin exposure, generating a recurred cell popuation. Untreated and recurred cell populations were then subjected to RNA extraction and hybridization on Affymetrix microarrays.

2010-10-01 | E-GEOD-18395 | biostudies-arrayexpress

Aging and oxidative stress in fly heads

Project description:Aging and oxidative stress in fly heads

| PRJNA99509 | ENA

Pandey2018-reversible transition between quiescence and proliferation

Project description:Cells switch between quiescence and proliferation states for maintaining tissue homeostasis and regeneration. At the restriction point (R-point), cells become irreversibly committed to the completion of the cell cycle independent of mitogen. The mechanism involving hyper-phosphorylation of retinoblastoma (Rb) and activation of transcription factor E2F is linked to the R-point passage. However, stress stimuli trigger exit from the cell cycle back to the mitogen-sensitive quiescent state after Rb hyper-phosphorylation but only until APC/CCdh1 inactivation. In this study, we developed a mathematical model to investigate the reversible transition between quiescence and proliferation in mammalian cells with respect to mitogen and stress signals. The model integrates the current mechanistic knowledge and accounts for the recent experimental observations with cells exiting quiescence and proliferating cells. We show that Cyclin E:Cdk2 couples Rb-E2F and APC/CCdh1 bistable switches and temporally segregates the R-point and the G1/S transition. A redox-dependent mutual antagonism between APC/CCdh1 and its inhibitor Emi1 makes the inactivation of APC/CCdh1 bistable. We show that the levels of Cdk inhibitor (CKI) and mitogen control the reversible transition between quiescence and proliferation. Further, we propose that shifting of the mitogen-induced transcriptional program to G2-phase in proliferating cells might result in an intermediate Cdk2 activity at the mitotic exit and in the immediate inactivation of APC/CCdh1. Our study builds a coherent framework and generates hypotheses that can be further explored by experiments.

2024-09-02 | BIOMD0000000954 | BioModels

Rb and the APC/C coactivator FZR1 determine CDK4/6-Cyclin D requirement in C. elegans and human cancer cells

Project description:Cyclin dependent kinase 4 and 6 (CDK4/6) in complex with D-type cyclins promote cell cycle entry, at least in part through phosphorylation of the retinoblastoma tumor suppressor protein (Rb). The CDK4/6-cyclin D-Rb pathway is commonly deregulated in human cancer, often through CDK4/6 or D-type cyclin overexpression, or inactivation of the CDK4/6 antagonist p16/CDKN2A. Importantly, a substantial fraction of cancers depend on continuous CDK4/6-cyclin D kinase activity and are sensitive to CDK4/6-specific inhibitors. Here, we investigate critical CDK4/6-cyclin D functions that may determine the sensitivity to CDK4/6 inhibitors, making use of the essential roles of CDK4/6 (CDK-4) and cyclin D (CYD-1) in the nematode C. elegans. In an unbiased screen, we found that simultaneous loss of C. elegans Rb (lin-35) and down-regulation of the APC/C substrate specificity factor FZR1/Cdh1 completely overcomes CDK-4/CYD-1 requirement. Furthermore, CDK-4/CYD-1 phosphorylates specific residues in the LIN-35 Rb spacer domain and FZR-1 N-terminus that correspond to inactivating phosphorylations of the human homologs. Thus, CDK-4/CYD-1 appears to promote cell cycle entry by antagonizing not only transcriptional repression by LIN-35 Rb but also protein degradation by APC/CFZR-1. Simultaneous knockdown of Rb and FZR1 in human breast cancer cells synergistically overcomes arrest by the CDK4/6-specific inhibitor PD 00332991. These results reveal APC/CFZR1 as a putative CDK4/6-Cyclin D target and important contributing factor in the response to CDK4/6-inhibitor treatment.

2016-07-05 | PXD001501 | Pride

Podocyte-specific deletion of tubular sclerosis complex 2 causes focal segmental glomerular sclerosis and progressive renal failure

Project description:Obesity can initiate and accelerate the progression of kidney diseases. However, it remains unclear how obesity affects renal dysfunction. Here, we show that a newly generated podocyte-specific tubular sclerosis complex 2 (Tsc2) knockout mouse model (Tsc2∆podocyte) develops proteinuria and dies due to end-stage renal dysfunction by 10 weeks of age. Tsc2∆podocyte mice exhibit an increased glomerular size and focal segmental glomerulosclerosis, including podocyte foot process effacement, mesangial sclerosis and proteinaceous casts. Podocytes isolated from Tsc2∆podocyte mice show nuclear factor, erythroid derived 2, like 2-mediated increased oxidative stress response on microarray analysis and their autophagic activity is lowered through the mammalian target of rapamycin (mTOR)—unc-51-like kinase 1 pathway. Rapamycin attenuated podocyte dysfunction and extends survival in Tsc2∆podocyte mice. Additionally, mTOR complex 1 (mTORC1) activity is increased in podocytes of renal biopsy specimens obtained from obese patients with chronic kidney disease. Our work shows that mTORC1 hyperactivation in podocytes leads to severe renal dysfunction and that inhibition of mTORC1 activity in podocytes could be a key therapeutic target for obesity-related kidney diseases.

2020-03-21 | GSE106828 | GEO

Effects of far-infrared rays on 3 human prostate cancer cell lines

Project description:We introduce anticancer effect of the far-infrared rays. The growth of three human prostate cancer cells (DU145, PC-3 and LNCaP) was suppressed in vitro only by far-infrared rays. The far-infrared rays induced the gene activation involved in apoptosis that exert positive effects on cancer control. Shima, H. et al. Far-infrared rays control prostate cancer cells in vitro and in vivo. Nature Precedings, hdl:10101/npre.12008.11980.10101 (2008). Keywords: cancer control Twelve samples were analyzed. Each sample was cultured quadricate. One replicate per array. The DU145, PC-3 and LNCaP cell lines were obtained from American Type Culture Collection (Manassas, VA, USA). DU145 cells were maintained in minimum essential medium supplemented with 10% heat-inactivated fetal calf serum, 2 mM L-glutamine, 100 U/ml penicillin G and 0.1 mM non-essential amino acids in an atmosphere of 5% CO2 at 37Â°C. PC-3 and LNCaP cells were maintained in F-12K medium and RPMI medium with the same supplements, respectively. All three cancer cells were cultured for 21 and 28 days with or without exposure to far-infrared rays. The cells without exposure to far-infrared rays were used as the reference samples (Far-infrared rays-treated vs. non-treated cells). Natural or synthetic rubber/resin (RB) was obtained as far-infrared rays emitter from Yamamoto Corporation (Osaka, Japan). RB consisted of rubber, lime stone and titanium metal powder in a honeycomb structure comprised of micron-sized cells, and had the ability to radiate far-infrared rays (4â25 um). Experimental samples were sandwiched with RBs for 21 and 28 days. Channels 1 were exposed to RB.

2010-05-05 | E-GEOD-15260 | biostudies-arrayexpress

Single nuclei transcriptomic profiling of adult Drosophila upon oxidative stress

Project description:Environmental factors, infection, or injury, can cause oxidative stress in diverse tissues and loss of tissue homeostasis. Effective stress response cascades, conserved from invertebrates to mammals, ensure reestablishment of homeostasis and tissue repair. Hemocytes, the Drosophila blood-like cells, rapidly respond to oxidative stress by immune activation. However, the precise signals how they sense oxidative stress and integrate these signals to modulate their immune response during oxidative stress are ill-defined. Furthermore, it remains unclear if all hemocytes respond similarly to oxidative stress or if there is a specification in distinct subsets. here, we employes single nuclei RNA-sequencing (snRNA-seq) to elcuidate the induced transcriptomic chnages in hemocytes and other cell types by Paraquat feeding compared to control food. Paraquat induces a pronounced oxidative stress response in Drosophila and we used this mdoel to study the diversification of immune cells upon this immune challenge in the adult fly.

2023-12-21 | GSE244295 | GEO

Transcription profiling by array of mouse immortalized embryonic fibroblasts to identify genes regulated by mTORC1

Project description:Mammalian target of rapamycin (mTOR) complex 1 (mTORC1) is a critical regulator of cell growth by integrating multiple signals (nutrients, growth factors, energy and stress) and is frequently deregulated in many types of cancer. We used a robust experimental paradigm involving the combination of two interventions, one genetic and one pharmacologic to identify genes regulated transcriptionally by mTORC1. In Tsc2+/+, but not Tsc2-/- immortalized mouse embryo fibroblasts (MEFs), serum deprivation downregulates mTORC1 activity. In Tsc2-/- cells, abnormal mTORC1 activity can be downregulated by treatment with rapamycin (sirolimus). By contrast, rapamycin has little effect on mTORC1 in Tsc2+/+ cells in which mTORC1 is already inhibited by low serum. Thus, under serum deprived conditions, mTORC1 activity is low in Tsc2+/+ cells (untreated or rapamycin treated), high in Tsc2-/- cells, but lowered by rapamycin; a pattern referred to as a M-^Slow/low/high/lowM-^T or M-^SLLHLM-^T, which allowed the identification of genes regulated by mTORC1 by performing the appropriate comparisons

2011-08-02 | E-GEOD-27982 | biostudies-arrayexpress

Expression data from early and macroscopic HCC lesions isolated from the Rb family Triple Knock Out model (scRNA-Seq)

Project description:we report the mRNA expression of single cells at two different time points of HCC development upon inactivation of Rb family. The first time point corresponds to lesions appearing in the portal triad area 9 weeks after Rb family inactivation. The second time point corresponds to macroscopic tumors, typically visible at the 20-25 weeks time point.

2024-05-05 | GSE173951 | GEO

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