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MicroRNA miR-92a-2 targets TFPI2 to ameliorate oxidative stress of the hypoxia neuron [miRNA]

ABSTRACT: Comparison of the differential expression mRNA profiles from the brain cortex of hypoxia and normaixa rats by silica microarray chip.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE86033 | GEO | 2016/08/26

SECONDARY ACCESSION(S): PRJNA340073

REPOSITORIES: GEO

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Project description:Background Diabetic cardiomyopathy (DCM) results from pathological changes in cardiac structure and function caused by diabetes. Excessive oxidative stress is an important feature of DCM pathogenesis. MicroRNAs (miRNAs) are key regulators of oxidative stress in the cardiovascular system. In the present study, we screened for the expression of oxidative stress-responsive miRNAs in the development of DCM. Furthermore, we aimed to explore the mechanism and therapeutic potential of miR-92a-2-5p in preventing diabetes-induced myocardial damage. Methods An experimental type 2 diabetic (T2DM) rat model was induced using a high-fat diet and low-dose streptozotocin (30 mg/kg). Oxidative stress injury in cardiomyocytes was induced by high glucose (33 mmol/L). Oxidative stress-responsive miRNAs were screened by quantitative real-time PCR. Intervention with miR-92a-2-5p was accomplished by tail vein injection of agomiR in vivo or adenovirus transfection in vitro. Results The expression of miR-92a-2-5p in the heart tissues was significantly decreased in the T2DM group. Decreased miR-92a-2-5p expression was also detected in high glucose-stimulated cardiomyocytes. Overexpression of miR-92a-2-5p attenuated cardiomyocyte oxidative stress injury, as demonstrated by increased glutathione level, and reduced reactive oxygen species accumulation, malondialdehyde and apoptosis levels. MAPK interacting serine/threonine kinase 2 (MKNK2) was verified as a novel target of miR-92a-2-5p. Overexpression of miR-92a-2-5p in cardiomyocytes significantly inhibited MKNK2 expression, leading to decreased phosphorylation of p38-MAPK signaling, which, in turn, ameliorated cardiomyocyte oxidative stress injury. Additionally, diabetes-induced myocardial damage was significantly alleviated by the injection of miR-92a-2-5p agomiR, which manifested as a significant improvement in myocardial remodeling and function. Conclusions miR-92a-2-5p plays an important role in cardiac oxidative stress, and may serve as a therapeutic target in DCM. Graphical Abstract Supplementary Information The online version contains supplementary material available at 10.1186/s11658-022-00379-9.

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MicroRNA miR-92a-2 targets TFPI2 to ameliorate oxidative stress of the hypoxia neuron [miRNA]

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