Early cardiac ageing: Phenotypic and transcriptional transitions in young to middle-aged mice
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE179286 | GEO | 2021/12/31
REPOSITORIES: GEO
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Project description:Recombinant tissue-type plasminogen activator (tPA) is the fibrinolytic drug of choice to treat stroke patients. However, a growing body of evidence indicates that besides its beneficial thrombolytic role, tPA can also have a deleterious effect on the ischaemic brain. Although ageing influences stroke incidence, complications and outcome, age-dependent relationships between endogenous tPA and stroke injuries have not been investigated yet. Here, we report that ageing is associated with a selective lowering of brain tPA expression in the murine brain. Moreover, our results show that albumin D site-binding protein (DBP) as a key age-associated regulator of the neuronal transcription of tPA. Additionally, inhibition of DBP-mediated tPA expression confers in vitro neuroprotection. Accordingly, reduced levels of tPA in old mice are associated with smaller excitotoxic/ischaemic injuries and protection of the permeability of the neurovascular unit during cerebral ischaemia. Likewise, we provide neuroradiological evidence indicating the existence of an inverse relationship between age and the volume of the ischaemic lesion in patients with acute ischaemic stroke. Together, these results indicate that the relationship among DBP, tPA and ageing play an important role in the outcome of cerebral ischaemia.
2009-08-24 | GSE9004 | GEO
Project description:Ischaemic preconditioning is a method of protecting tissue against ischaemia-reperfusion injury. It is an innate protective mechanism that increases a tissue's tolerance to prolonged ischaemia when it is first subjected to short burst of ischaemia and reperfusion. It is thought to provide this protection by increasing the tissue's tolerance to ischaemia, therby reducing oxidative stress, inflammation and apoptosis in the preconditioned tissue. We used microarrays to investigate the genomic response induced by ischaemic preconditioning in muscle biopsies taken from the operative leg of total knee arthroplasty patients in order to gain insight into the ischaemic preconditioning mechanism.
2010-04-02 | GSE21164 | GEO
Project description:Recombinant tissue-type plasminogen activator (tPA) is the fibrinolytic drug of choice to treat stroke patients. However, a growing body of evidence indicates that besides its beneficial thrombolytic role, tPA can also have a deleterious effect on the ischaemic brain. Although ageing influences stroke incidence, complications and outcome, age-dependent relationships between endogenous tPA and stroke injuries have not been investigated yet. Here, we report that ageing is associated with a selective lowering of brain tPA expression in the murine brain. Moreover, our results show that albumin D site-binding protein (DBP) as a key age-associated regulator of the neuronal transcription of tPA. Additionally, inhibition of DBP-mediated tPA expression confers in vitro neuroprotection. Accordingly, reduced levels of tPA in old mice are associated with smaller excitotoxic/ischaemic injuries and protection of the permeability of the neurovascular unit during cerebral ischaemia. Likewise, we provide neuroradiological evidence indicating the existence of an inverse relationship between age and the volume of the ischaemic lesion in patients with acute ischaemic stroke. Together, these results indicate that the relationship among DBP, tPA and ageing play an important role in the outcome of cerebral ischaemia. For each stage (4 months and 21 months), samples were prepared by pooling an equal amount of the 3 individual RNA. Five M-BM-5g of total RNA from each pool were reverse-transcribed in the presence of 7.5M-BM-5M random hexamers (GE Healthcare), 75M-BM-5M aminoallyl-dUTP (Sigma-Aldrich) and 100U Rtases Reverse-iT Blend (Thermo scientific) overnight at 37M-BM-0C. Aminoallyl cDNAs were then labelled with Cy5 or Cy3 mono-Reactive Dye (GE Healthcare) according to the manusfacturerM-bM-^@M-^Ys instructions. Labelled cDNAs were then purified on Qiaquick PCR prurification kit (Qiagen) and hybridized to the RNG-MRC_MM25k_EVRY microarrays (Le brigand et al., NAR, 2006) according to the RNG procedures (http://www.microarray.fr:8080/merge/index). Each pool was hybridized in duplicate dye-swap independent experiments. After hybridization, median signal and median background intensities were extracted using Genepix 4.1 software (Axon Instruments). We have first evaluated the level of expression of each gene by calculating the mean ratio M-bM-^@M-^\signal/backgroundM-bM-^@M-^] for each corresponding spot from the 2 dye-swap experiments. Genes were considered to be expressed if their mean ratio was higher or equal to 1.2. Genes with mean ratio < 1.2 in the 2 conditions were not used for further analysis. These filtered data were then submitted to VARAN (http//:www. bionet. espci.fr) for normalization by lowess fit and differential expression analysis (Golfier et al., 2004). Normalized log2ratio 21 months/4 months were then used for further statistical analysis by SAM software (Tusher et al., 2001) and t-test with a p-value equal to 5% using TIGR Multiexperiment Viewer (TM4:MeV, http://www.tm4.org/mev.html). The final list of differentially expressed genes was established by comparing the results obtained with the 3 methods.
2009-08-23 | E-GEOD-9004 | biostudies-arrayexpress
Project description:Ischaemic preconditioning is a method of protecting tissue against ischaemia-reperfusion injury. It is an innate protective mechanism that increases a tissue's tolerance to prolonged ischaemia when it is first subjected to short burst of ischaemia and reperfusion. It is thought to provide this protection by increasing the tissue's tolerance to ischaemia, therby reducing oxidative stress, inflammation and apoptosis in the preconditioned tissue. We used microarrays to investigate the genomic response induced by ischaemic preconditioning in muscle biopsies taken from the operative leg of total knee arthroplasty patients in order to gain insight into the ischaemic preconditioning mechanism. Patients undergoing primary knee arthroplasty were randomised to control and treatment (ischaemic preconditioning) groups. Patients in the treatment group received a preconditioning stimulus immediately prior to surgery. The ischaemic preconditioning stimulus consisted of three five-minute periods of tourniquet insufflation on the lower operative limb, interrupted by five minute periods of reperfusion. All patients had a tourniquet applied to the lower limb after the administration of spinal anaesthesia, as per normal protocol for knee arthroplasty surgery. Muscle biopsies were taken from the quadriceps muscle of the operative knee at the immediate onset of surgery (T0) and at 1 hour into surgery (T1). Total RNA was extracted from biospies of four control and four treatment patients and hybridised to the Affymetrix Human U133 2.0 chip.
2010-04-12 | E-GEOD-21164 | biostudies-arrayexpress
Project description:Background: Restitution of the surface epithelium is a critical healing process early after ischaemic injury of the gut mucosa. Repeated episodes of intestinal ischaemia occur in many critically ill patients. This study evaluates the resistance of postischaemic restituted intestinal mucosa to a further ischaemic insult. Methods: The superior mesenteric artery (SMA) in pigs was cross-clamped for 1 hour, reperfused for 4 hours, cross-clamped once again for 1 hour, and finally reperfused for 3 hours. Intestinal injury was evaluated with morphometry. Intestinal permeability (from blood to lumen was assessed by transport of fluorescein isothiocyanate dextran (FD-4). Microarray and QRT-PCR analysis were performed.
2007-09-20 | E-MEXP-978 | biostudies-arrayexpress
Project description:Early cardiac ageing: Phenotypic and transcriptional transitions in young to middle-aged mice
| PRJNA743067 | ENA
Project description:To investigate ageing-related changes in cardiac transcriptome of FVB mice we performed differential gene expression profiling analysis using data obtained from RNA-seq of five life time points (4-, 8-, 10-, 12-, 14 months) by comparing older FVB mice (8-, 10-, 12-, 14 months) to young 4-month-old FVB mice (FVB vs. FVB analysis). Genes that were differentially expressed in FVB vs. FVB analysis were also annotated to the respective biological processes based on Gene Ontology database, assessed for their overrepresentation to indicate processes involved in cardic ageing process in FVB mice. To investigate heart failure-related as well as ageing-related changes in cardiac transcriptome of Tgαq*44 mice we performed differential gene expression profiling analysis using data obtained from RNA-seq of five life time points (4-, 8-, 10-, 12-, 14 months) by comparing Tgαq*44 to age-matched FVB mice (Tgαq*44 vs. FVB analysis). Genes that were differentially expressed in Tgαq*44 vs. FVB analysis were also annotated to the respective biological processes based on Gene Ontology database, assessed for their overrepresentation to indicate processes iniciated along heart failure development as well as cardiac ageing process in Tgαq*44 mice. To investigate early activated ageing-related changes in cardiac transcriptome of Tgαq*44 mice during entire heart failure development we searched for the presence of ageing-related genes (those identified in cardiac transcriptome of older FVB mice) among genes which were differentially expressed commonly at each measured time points in Tgαq*44 vs. FVB analysis. To investigate early activated aging-related biological processes in cardiac transcriptome of Tgαq*44 mice during entire heart failure development, we searched for the presence of ageing-related processes (those identified in cardiac transcriptome of older FVB mice) among processes which were overrepresented commonly at each measured time points in Tgαq*44 vs. FVB analysis.
2022-12-15 | GSE207648 | GEO
Project description:MS analysis of human cardiac samples from left ventricles of patients undergoing cardiac transplantation due to ischaemic heart failure (n=5) or non-ischaemic heart failure (n=10), as well as controls samples (n=6). Analysis of extracellular matrix protein enriched extracts.
2021-12-15 | PXD028908 | Pride
Project description:MS analysis of human cardiac samples from left ventricles of patients undergoing cardiac transplantation due to ischaemic heart failure (n=5) or non-ischaemic heart failure (n=10), as well as controls samples (n=6). Analysis of extracellular matrix protein enriched extracts.
2021-12-15 | PXD028942 | Pride
Project description:Aging is the progressive decline in organismal function that leads to an increased risk of multiple diseases and mortality. The molecular basis of this decline is unknown. Using quantitative PCR for mitochondrial mRNA from multiple tissues from the same animals, we found that the rate of change in mouse mitochondrial expression is tissue-specific, with cardiac expression declining early (8-10 months), adipose expression declining late (25-30 months), and no change in kidney or skin. In cardiac tissue, mitochondria-derived mRNA levels declined more slowly than nuclear encoded mRNAs, suggesting a potential dysregulation. These changes were independent of alteration in mitochondrial number, as measured by quantitative PCR of mitochondrial DNA and citrate synthase activity. We found no change in the variability between mitochondrial mRNA levels with age, suggesting that the changes are not due to random dysregulation at the level of gene expression. Caloric restriction (CR), a lifespan-extending intervention proposed to act through mitochondrial biogenesis, delayed the decline in both cardiac and adipose mitochondrial mRNA levels of F344 rats. CR caused an increase in citrate synthase activity but did not alter mitochondrial DNA content, indicating increased translation or reduced turnover of mitochondrial proteins. These results demonstrate that mitochondrial gene expression changes with age are not coupled to mitochondrial number, are likely to be regulated, and are governed by tissue-specific processes. These findings indicate that aging is neither a programmed organism-wide change orchestrated in a top-down fashion nor a product of random dysregulation of gene expression but that tissue-specific factors may independently control aging in different organ compartments. Keywords: aging Cardiac ventricle total RNA from 10 young (4-6 month) and 10 young (25-28 month) mice were compared.
2015-07-03 | E-GEOD-12480 | biostudies-arrayexpress