Iron accumulation drives fibrosis, senescence, and the senescence-associated secretory phenotype
Ontology highlight
ABSTRACT:
INSTRUMENT(S): NextSeq 550
ORGANISM(S): Mus musculus
SUBMITTER: Camille Stephan-Otto Attolini
PROVIDER: E-MTAB-13032 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
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2010-09-06 | E-GEOD-22227 | biostudies-arrayexpress
Project description:High intracellular levels of unbound iron can contribute to the production of reactive oxygen species (ROS) in the Fenton reaction, while depletion of iron limits the availability of iron containing proteins, some of which have important functions in the oxidative stress defense. Vice versa increased ROS levels lead to damage of proteins with iron sulfur centers. Thus organisms have to coordinate and balance their responses to oxidative stress and iron availability. Our knowledge on the molecular mechanisms underlying the coregulation of these responses is still limited. To discriminate between a direct cellular response to iron limitation and indirect responses, which are the consequence of increased levels of ROS, we compared the response of the alpha proteobacterium Rhodobacter sphaeroides to iron limitation in presence or absence of oxygen. While some genes respond to iron limitation exclusively or much stronger in presence of oxygen, other genes show much stronger response in anaerobic conditions. Remarkably few genes show even opposite response to iron depletion in presence or absence of iron. RNA samples collected from anaerobically or microaerobically grown cultures in presence or absence of iron were analyzed by RNA_sequencing
2013-05-30 | E-GEOD-47449 | biostudies-arrayexpress
Project description:Iron is an essential nutritional element; its deficiency in the body causes nutritional problems and a decrease in iron storage that can lead to anemia. The liver not only stores iron but is an important metabolic target as well. Dietary iron deficiency is associated with changes in the metabolism of nutrients such as lipids. However, to the best of our knowledge, a global analysis detailing the consequences of iron deficiency in the body has not yet been reported. We performed a comprehensive transcriptome analysis using DNA microarray technology to reveal the effects of iron deficiency on hepatic gene expression. Four-week-old rats were fed an iron-deficient diet or a control diet for 16 days. On day 17, the rats were sacrificed under anesthesia, and their livers were dissected for DNA microarray analysis. We identified 600 up-regulated and 500 down-regulated probe sets to characterize the iron-deficient diet group. The up-regulated probe sets contained genes for enzymes that are involved in cholesterol, amino acid, and glucose metabolisms, as well as in apoptosis. The down-regulated probe sets included genes for enzymes associated with lipid metabolism. Additionally, the 16-day iron-deficient diet induced anemia. Our gene expression analysis revealed that, as a result, cholesterol biosynthesis, gluconeogenesis, and apoptosis due to endoplasmic reticulum stress were accelerated, while fatty acid biosynthesis was suppressed by dietary iron deficiency. Our analysis also showed that cholesterol metabolism, including bile acid biosynthesis, was accelerated in the initial stages of cholesterol accumulation. Experiment Overall Design: Male 3-week-old Sprague Dawley rats were purchased from Charles River Japan (Kanagawa, Japan) and housed in a room conditioned at 24 ± 1°C and 40 ± 5% humidity with a 12-h light-dark cycle (lights on at 08:00). The rats were given a control diet and water for 24 h ad libitum. Diets for rats were obtained from Research Diets, Inc. (New Brunswick, NJ, USA). The composition of the control diet was based on the AIN93G diet , except that cellulose was replaced by Avicel, since cellulose is an ingredient of variable iron content. The iron-deficient diet was prepared by removal of iron (ferric citrate) from the control diet. At day 8, rats were divided into two groups comprising animals of similar body weights. One group (n = 6) was fed the control diet and the other group (n = 7) was fed the iron-deficient diet (iron-deficient diet group). After iron-deficient diet feeding was started, blood hemoglobin levels were measured every two days. Blood samples for hemoglobin measurements were collected from the tail vein, and hemoglobin levels were measured by using the Wako Hemoglobin B test (Wako Pure Chemical Industries, Osaka, Japan). On day 12 of the iron-deficient diet treatment, diets were removed at 17:00, and feeding was conducted between 09:00 and 17:00 for another 4 days. This protocol was intended to synchronize the ratsâ feeding behavior. On day 17 of the iron-deficient diet treatment, rats were fed for 1.5 h prior to sacrifice under anesthesia. Livers were then excised and subsequently immersed in RNAlater (Applied Biosystems Japan, Tokyo, Japan). Blood hemoglobin level of rats fed an iron-deficient diet decreased significantly over the course of the feeding. On day 17, the hemoglobin level in the iron-deficient diet group was 42% of that of the control diet group (P < 0.01).
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Project description:The protein abundance of Synechocystis in response to the given copper-iron combination was examined, then followed by comparative proteomic analyses to reveal the proteins associated with copper and iron stress. These data would provide a theoretical basis for understanding the relationship between copper and iron in cyanobacteria at the protein level and shed light on the role of these two metal elements in energy metabolism and biomass accumulation of cyanobacteria.
2021-04-26 | PXD024873 | Pride
Project description:Hereditary hemochromatosis and transfusional iron overload are frequent clinical conditions associated with progressive iron accumulation in parenchymal tissues leading to eventual organ failure. We have discovered a novel mechanism to reverse iron overload by pharmacological modulation of the divalent metal transporter-1 (DMT-1). DMT-1 mediates intracellular iron transport during the transferrin cycle and apical iron absorption in the duodenum. Additional functions in iron handling in the kidney and liver are less well understood. We show that the L- type calcium-channel blocker nifedipine increases DMT-1 mediated cellular iron transport 10-to 100-fold at concentrations between 1-100 uM. Mechanistically, nifedipine causes this effect by prolongation of the activity of DMT-1 to transport iron. We show that nifedipine mobilizes iron from the liver of mice with primary and secondary iron overload, and enhances urinary iron excretion. Modulation of DMT-1 function by L-type calcium-channel blockers emerges a novel pharmacological concept to treat iron overload disorders.<br> <br> In this experiment mice were subjected to dietary iron overload before being treated with nifedipine at 5 ug/g bodyweight, or mock treated with the same volume of solvent.
2007-03-01 | E-MEXP-982 | biostudies-arrayexpress
Project description:Entamoeba histolytica is the parasite causing amoebiasis, an infectious disease targeting the intestine and liver of humans. The molecules involved in amoeba adaptation to different iron conditions during the invasive process are unknown. To investigate the effects of iron availability on gene expression in E. histolytica, we determined by microarray experiments the gene expression profile of parasites grown in the presence of different iron concentrations. Conditions included low amounts of iron, iron starvation and iron starvation supplemented with hemoglobin (Hb). Genes encoding important proteins involved in iron metabolism, reported in other organism such as bacteria, were identified for the first time in E. histolytica. The influence of iron on the amount of these transcripts was confirmed by quantitative real-time PCR and their protein products were analyzed by Western blots
2014-06-30 | E-MTAB-1158 | biostudies-arrayexpress
Project description:8-week-old wild-type 129S6/SvEvTac mice were maintained under regular iron diet (containing 330 ppm iron) or iron-enriched diet (the same standard diet supplemented with 2% carbonyl iron) for 4 weeks. 7-week-old wild-type 129S6/SvEvTac mice were maintained under iron-deficient diet (with negligible iron content) for 5 weeks. All mice were sacrificed at the age of 12 weeks. Livers were harvested and total RNA was extracted using TRIZol method followed by miRNA-enrichment using Qiagen columns. Liver RNA samples from 3 mice (female and male) from each group were sent to Exiqon for microarray analysis.
2014-09-04 | E-MTAB-1520 | biostudies-arrayexpress
Project description:Affymetrix microarrays were used to determine the mRNA composition of mRNPs obtained by immunoprecipitation with IRP1 (iron regulatory protein 1). Reference Sanchez at al., 2007 Nat. Protoc. Affymetrix microarrays were used to determine the mRNA composition of mRNPs obtained by immunoprecipitation with IRPs (iron regulatory proteins). In brief, total RNA was extracted from the reported tissue of four to six C57BL6/J mice using Trizol reagent. mRNA from duodenum, liver and spleen were extracted from mice fed with an iron poor diet (<10mg/kg, Altromin Spezialfutter GmbH & Co, Lage, Germany) for 21 days starting from weaning age. mRNAs from bone marrow and brian were extracted from mice (8-10 weeks old) fed with an iron-normal diet. For each tissue, the RNA samples were pooled and the immunoprecipitations were carried out combining 50 M-BM-5g of total RNA with purified recombinant IRP1 produced in E.coli and a rabbit polyclonal anti-IRP1 antibody. A control reaction in which the recombinant IRP1 was omitted was performed in parallel (referred with the word M-bM-^@M-^\controlM-bM-^@M-^] in the title). All the microarray procedures were conducted at the EMBL Genomics Core Facility using standard Affymetrix protocols. In brief, approximately 120ng of immunoprecipitated RNA was used as input to a two-step amplification procedure to generate biotin-labeled RNA fragments for hybridization to the Affymetrix GeneChip Mouse Genome 430 2.0 array (Eukaryotic Sample and Array Processing manual 701024 Rev.3). Intensity values for the hybridizations were obtained either using RMA, calculations done in bioconductor (www.bioconductor.org) or MAS5, calculated using Affymetrix GCOS package. MAS5 calculated intensities were further quantile normalized using bioconductor.
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2014-03-10 | E-GEOD-54304 | biostudies-arrayexpress
Project description:Accumulation of fatty bone marrow (FBM) is one of the key age related changes possibly influencing the blood system. While a link between obesity and cancer evolution has been reported it remains unknown whether FBM can modify the evolution of the early stages of leukemia and clonal hematopoiesis (CH). To address this question, we established different FBM mouse models in immunodeficient mice in whom we can study both mouse and human cells. We focused our studies on two FBM models: 1) after sublethal irradiation; 2) after castration; and in both we used an adipogenesis inhibitor as a control (PPARγ inhibitor). We transplanted both human and mice hematopoietic stem cells (HSCs) carrying DNMT3A mutations into immunodeficient mice with FBM. A significant increase in self-renewal was found when DNMT3AMut-HSCs were exposed to FBM. To better understand the mechanisms of the FBM-CH interaction, we performed single cell RNA-sequencing on HSPCs after FBM exposure in vivo. A 6-10 fold increase in DNMT3AMut-HSCs was observed under FBM conditions in comparison to normal bone marrow. Mutated HSCs from mice exposed to FBM exhibited an activated inflammatory signaling (IL-6 and IFNγ). Cytokine analysis of BM fluid and BM derived adipocytes grown in vitro demonstrated increased IL-6 levels under FBM conditions. Anti-IL-6 neutralizing antibodies significantly reduced the selective advantage of mice derived DNMT3AMut-HSCs exposed to FBM. Overall, paracrine FBM inflammatory signals promote DNMT3A-driven clonal hematopoiesis, which can be inhibited by blocking the IL-6 receptor.
2023-02-19 | E-MTAB-12620 | biostudies-arrayexpress