Similar Datasets
Project description:Cardiac arrhythmias, instigated by mechanical and electrical remodeling, are associated with activation of extracellular matrix metalloproteinases (MMPs). However, the connection between intracellular MMPs activation and arrhythmogenesis is not well established. Previously, we determined localization of MMP in the mitochondria using confocal microscopy. We tested the hypothesis that electrical pacing induces the activation of mitochondrial MMP (mtMMP) and is associated with myocyte mechanical dysfunction. Myocytes were isolated and field stimulated at 1 and 4 Hz. Myocyte mechanics and calcium transient was studied using Ion-Optix system. Mitochondrial MMP-9 activation was evaluated using zymography. There was a 25% increase in 1 Hz and 40% increase in 4 Hz stimulation. We observed an increase in mtMMP activation with increase in electrical pacing compared to 0 Hz with a significant increase (p<0.05, n=3). Field stimulation at 4 Hz decreased cell re-lengthening. The levels of calcium transient were reduced with increase in contraction frequency. We conclude that electrical stimulation activates mtMMP-9 that is associated with myocyte mechanical dysfunction.
| S-EPMC3026058 | biostudies-literature
Project description:The purpose of this microarray study is to characterize molecular and functional differences between CD4+CD300a+ vs CD4+CD300a- T lymphocytes, and between CD8+CD300a+ vs CD8+CD300a- T lymphocytes, respectively.
2011-01-26 | E-TABM-902 | biostudies-arrayexpress
Project description:Differentiation of CD8+ T lymphocytes into effector and memory cells is key for an adequate immune response and relies on complex interplay of pathways that convey signals from cell surface to nucleus. In this study, we fractionated four CD8+ T cell subtypes; naïve, recently activated effector, effector and memory cells into membrane, cytosol, soluble nucleus, chromatin-bound and cytoskeleton compartments. Using LC-MS/MS analysis, identified peptides were matched to human peptides/proteins (SwissProt). Compartment fractionation and gel-LC-MS separation identified 2399 proteins in total. Among these 735 were detected in all five, 241 in four, 257 in three, 368 in two and 798 found in only one fraction. Comparison between the two most different subsets, naïve and effector, yielded 146 significantly regulated proteins.
2016-02-29 | MSV000079540 | MassIVE
Project description:Transcriptome analysis comparing naive and Listeria monocytogenes-induced spleen memory CD8 T lymphocytes were conducted to identify key functions associated with memory CD8-mediated immune protection. Gene expression analysis was performed on quiescent and re-stimulated CD8 T cells.
2016-09-09 | GSE86601 | GEO
Project description:Transcriptome analyses of naive, effector and memory CD8 TCRP1A lymphocytes expressing or not an active form of the transcription factor Stat5. TCRP1A CD8 T lymphocytes were activated by their cognate Ag for 72h to induce their differentiation in effector T cells (TCRP1A eTL 72h: 4 replicates S1, S2, S3, S4). In some samples, an active form of Stat5 was introduced (TCRP1A Stat5ca eTL 72h: 2 replicates S9, S10). These 72h activated T cells were either purified and analyzed directly (samples mentioned above) or injected in congeneic hosts and recovered more than 20 days later from the host spleen and lymph nodes: TCRP1A eTL >d20: 2 replicates– S30, S32; TCRP1A Stat5ca eTL >d20: 4 replicates S11, S12, S13, S14). Naive TCRP1A CD8 T lymphocytes (TCRP1A-naive: 4 replicates S33, S34, S35, S36) are included as controls. TCRP1A CD8 T lymphocytes were activated by anti-CD3/CD28. After 24h, an active form of Stat5 was introduced in activated cells. Culture was continued for another 48h to induce their differentiation in effector T cells. These 72h activated T cells were either directly injected in congeneic hosts and recovered more than 14 days later from the host spleen and lymph nodes: T-BetKO Stat5ca >d14: 3 replicates S39, S40, S41.
2013-09-13 | E-GEOD-26945 | biostudies-arrayexpress
Project description:Differentiation of CD8+ T lymphocytes into effector and memory cells is key for an adequate immune response and relies on complex interplay of pathways that convey signals from cell surface to nucleus. In this study, we fractionated four CD8+ T cell subtypes; naïve, recently activated effector, effector and memory cells into membrane, cytosol, soluble nucleus, chromatin-bound and cytoskeleton compartments. Using LC-MS/MS analysis, identified peptides were matched to human peptides/proteins (SwissProt). Compartment fractionation and gel-LC-MS separation identified 2399 proteins in total. Among these 735 were detected in all five, 241 in four, 257 in three, 368 in two and 798 found in only one fraction. Comparison between the two most different subsets, naïve and effector, yielded 146 significantly regulated proteins.
2015-02-04 | PXD001065 | Pride
Project description:IL-10 is an anti-inflammatory cytokine that has been shown to be produced by antigen-specific CD8 T cells at the peak of viral encephalitis. We found that IL-10+CD8 T cells are more activated and cytolytic than IL-10-CD8 T cells. We used microarrays to detect gene expression changes in directly ex vivo sorted CNS IL-10+ and IL-10- CD8 T cells from a neurotropic J2.2-V-1-infected mouse. C57Bl/6 Vert-X (IL-10-eGFP) mice were infected intracranially with 500 PFU J2.2-V-1 virus and seven days later their brain lymphocytes from three mice were pooled and then isolated and negatively selected for CD8 T cells. The CD8 pooled brain lymphocytes were then sorted for IL-10+ and IL-10- CD8 T lymphocytes using GFP as a marker from the same samples. This was performed three times to obtain six samples total. RNA was extracted and hybridized to GeneChip Mouse GENE 1.0 ST arrays (Affymetrix).
2010-12-07 | E-GEOD-25846 | biostudies-arrayexpress
Project description:Transcriptome analysis comparing naive, protective and non-protective spleen memory CD8 T lymphocytes were conducted to identify key functions associated with memory CD8-mediated immune protection. Memory CD8 T cells generated in response to influenza or vaccinia infection (Flu-memory and VV-memory) were compared to inflammatory memory cells (TIM) that were generated by peptide in inflammatory context. Gene expression analysis was performed on quiescent and re-stimulated CD8 T cells.
2016-09-19 | GSE70763 | GEO
Project description:Passive implants currently used in the clinics cannot prevent failure rates and inherent revision arthroplasties. Novel bioelectronic devices that include biophysical stimulators (such as electric stimulators) and sensing systems are desired since these will allow for long-term monitoring and control of the bone-implant interface, in a personalized manner. We have developed acting-sensing dual systems operated at high frequency (HF) that are able to stimulate osteoconduction in pre-osteoblasts and osteoinduction in human adipose-derived mesenchymal stem cells (hASCs). The project included – to our knowledge – the first-time proteomic analysis of microvesicles secreted from osteoblasts electrically-stimulated in vitro by a capacitive stimulator of thin interdigitated electrodes delivering an electrical 60 kHz HF stimulation, 30 min/day. Results revealed regulation of osteodifferentiation and mineralization-related proteins (e.g. Tgfb3, Ttyh3, Itih1, Aldh1a1).
2021-11-29 | PXD028551 | Pride
Project description:Transcriptome analyses of memory CDKN2A-/- CD8 T lymphocytes expressing an active form of the transcription factor Stat5. CDKN2A-/- CD8 T lymphocytes were activated by anti-CD3/CD28. After 40h, an active form of Stat5 was introduced in activated cells. Culture was continued for another 48h to induce their differentiation in effector T cells. These 88h activated T cells were injected in congeneic hosts and recovered 15 days later from the host spleen and lymph nodes: CDKN2A-/- Stat5ca -d15: 2 replicates– S46, S47. This study is a complement of the samples previously deposited under accession number GSE41819. Those two new samples are compared to previously deposited: - activated CD8 T lymphocytes transduced to express Stat5ca and transferred in congenic hosts: o S11 (GSM663446); o S12 (GSM663445); o S13 (GSM663444); o S14 (GSM663439). and - naive peripheral CD8 T lymphocytes : o S33 (GSM663441); o S34 (GSM663435); o S35 (GSM663449); o S36 (GSM663447).
2015-05-04 | E-GEOD-56154 | biostudies-arrayexpress