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No currently available biomarkers or treatment regimens fully meet therapeutic needs of type 1 diabetes mellitus (T1DM). Circular RNA (circRNA) is a recently identified class of stable noncoding RNA that have been documented as potential biomarkers for various diseases. Our objective was to identify and analyze plasma circRNAs altered in T1DM.
We used microarray to screen differentially expressed plasma circRNAs in patients with new onset T1DM (
We identified 68 differentially expressed circRNAs, with 61 and seven being up- and downregulated respectively. Four of the six selected candidates were successfully validated. Curations of their predicted interacting miRNAs revealed critical roles in inflammation and pathogenesis of autoimmune disorders. Functional relations were visualized by a circRNA-miRNA-mRNA network. GO and KEGG analyses identified multiple inflammation-related processes that could be potentially associated with T1DM pathogenesis, including cytokine-cytokine receptor interaction, inflammatory mediator regulation of transient receptor potential channels and leukocyte activation involved in immune response.
Our study report, for the first time, a profile of differentially expressed plasma circRNAs in new onset T1DM. Further
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Cardiovascular diseases represent the leading cause of death and moderate physical exercise is associated with a reduction in cardiovascular risk. The aim of the study was to evaluate the correlation between the amount of exercise recorded daily by a wearable gravitometer for 3 months and selected biochemical and clinical parameters. Nineteen sedentary type 2 diabetics were recruited and distributed into three homogenous groups, low, medium, and high exercise, according to the level of physical exercise monitored and expressed as MOVEs. Data showed an inverse correlation between MOVEs and oxidative stress indexes and a significant improvement in paraoxonase-1 activities and endothelial functionality. Decrease of visceral/total adipose tissue ratio, systolic blood pressure and a down-regulation of the inflammatory microRNA-146a in high exercise group were observed. Finally, a decrease of glycosylated hemoglobin and an up-regulation of the angiogenic microRNA-130a in medium exercise one was obtained. In this study, precise daily monitoring permitted to underline the importance of the amount of physical activity to counteract some cardiovascular risk factors persisting in diabetes. Finally, it identifies new microRNA biomarkers for future investigation on the same topic.
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Recent studies have shown that microRNAs (miRNAs) are involved in the process of cardiomyocyte apoptosis. We have previously reported that granulocyte-colony stimulating factor (G-CSF) ameliorated diastolic dysfunction and attenuated cardiomyocyte apoptosis in a rat model of diabetic cardiomyopathy. In this study, we hypothesized a regulatory role of cardiac miRNAs in the mechanism of the anti-apoptotic effect of G-CSF in a diabetic cardiomyopathy rat model.
Rats were given a high-fat diet and low-dose streptozotocin injection and then randomly allocated to receive treatment with either G-CSF or saline. H9c2 rat cardiomyocytes were cultured under a high glucose (HG) condition to induce diabetic cardiomyopathy
G-CSF treatment significantly decreased apoptosis and reduced miR-34a expression in diabetic myocardium and H9c2 cells under the HG condition. G-CSF treatment also significantly increased B-cell lymphoma 2 (Bcl-2) protein expression as a target for miR-34a. In addition, transfection with an miR-34a mimic significantly increased apoptosis and decreased Bcl-2 luciferase activity in H9c2 cells.
Our results indicate that G-CSF might have an anti-apoptotic effect through down-regulation of miR-34a in a diabetic cardiomyopathy rat model.
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