MiR-877-5p targets PDK-1 to promote aspirin-induced apoptosis in gastric mucosal cells

This study aimed to investigate the role of miR-877-5p in aspirin-induced gastric mucosal injury. MiRNA microarray analysis was performed using paired gastric mucosal samples to find differentially expressed miRNAs. miR-877-5p was selected for subsequent analyses. Used as a model system, gastric epithelial cells (GES-1) were transfected with miR-877-5p mimic/inhibitor, then treated with aspirin. The expression of miR-877-5p in GES-1 cells was examined using quantitative real-time PCR (qRT-PCR). Flow cytometry analysis was used to detect cell apoptosis. Western blot assay was used to measure the protein levels of PDK1. The interaction between miR-877-5p and PDK1 was determined by luciferase reporter assay. The expression of miR-877-5p in gastric mucosal injury samples was higher than that in normal samples. Also, depletion of miR-877-5p reduced the apoptosis of GES-1 cells. Luciferase reporting assay confirmed that PDK1 was a target gene of miR-877-5p. PDK1 inhibited the apoptosis of GES-1 cells treated by aspirin. Moreover, this inhibitory effect was abrogated after PDK1 knockdown. Downregulation of miR-877-5p reduced the apoptosis by targeting PDK1 in GES-1 cells treated by aspirin, indicating that miR-877-5p may be a potential therapeutic target for gastric mucosal injury caused by aspirin.

The mechanism of miR-363-3p/DUSP10 signaling pathway involved in the gastric mucosal injury induced by clopidogrel

Clopidogrel-induced gastric injury is an important clinical problem. However, the exact mechanism is still unclarified. Increasing evidence indicates that miRNAs may be involved in the pathogenesis of gastric mucosal injury. In this study, the aim was to investigate the role of miR-363-3p in the gastric mucosal injury caused by clopidogrel. MiRNA microarray analysis was performed using paired gastric mucosal in order to find differential expression of miRNAs. The levels of miR-363-3p were examined in gastric mucosal injury caused by clopidogrel. The GES-1 cells were used as a model system, miR-363-3p mimic/inhibitor was transfected into GES-1 cells, then GES-1 cells were treated with clopidogrel. The levels of miR-363-3p and DUSP10 were examined in GES-1 cells using quantitative real-time PCR (qRT-PCR). CCK-8 assay and flow cytometry analysis were used to detect cell proliferation and apoptosis, respectively. Western blot assay was used to measure the protein levels of DUSP10. The interaction between miR-363-3p and DUSP10 was determined by luciferase reporter assay. MiR-363-3p was selected as a differentially expressed miRNA. The expression of miR-363-3p in gastric mucosal injury caused by clopidogrel was higher than that in normal samples. Also, depletion of miR-363-3p increased the proliferation of GES-1 cells and reduced the apoptosis. Luciferase-reporting assay results confirmed that DUSP10 was one of the target genes of miR-363-3p. DUSP10 inhibited apoptosis in GES-1 cells treated by clopidogrel. Moreover, DUSP10 knockdown abrogated the inhibitory effects on apoptosis in GES-1 cells mediated by miR-363-3p inhibitor. Knockdown of miR-363-3p increased the proliferation and reduced the apoptosis by targeting DUSP10 in GES-1 cells treated by clopidogrel, indicating that miR-363-3p may be a potential therapeutic target for gastric mucosal injury caused by clopidogrel.

Long Noncoding RNA Myocardial Infarction-Associated Transcript as a Cancer Promoting Factor in Colon Cancer Development

Objection: The study aimed to explain the effects and mechanisms of long noncoding RNA (lncRNA) MIAT in development of colon cancer. Methods: The adjacent and cancer tissues which were collected from 30 cases colon cancer patients were evaluated pathology by HE staining and lncRNA MIAT expression by ISH assay. In the vitro study, SW620 cells were divided into NC, siRNA-control and siMIAT groups. Measuring cell proliferation, apoptosis, cell cycle, invasion and migration by CCK-8, flow cytometry, transwell and wound healing, and evaluating the relative proteins expressions by WB assay. Results: Compared with adjacent normal tissues, the lncRNA MIAT was significantly up-regulation in colon cancer tissues (P < 0.001). By cell experiment, with lncRNA MIAT knockdown, the cell proliferation was significantly depressed (P < 0.001) via significantly improving cell apoptosis and keeping the cell in the G1 phase (P < 0.001, respectively); the invasion SW620 cell number and wound healing rate were significantly suppressed (P < 0.001, respectively). The relative proteins (CDK2, Cyclin D3 and MMP-9) expressions of siMIAT group were significantly down-regulation compared with those of NC group (P < 0.001, respectively). Conclusion: Our study found that lncRNA MIAT expression is closely associated with colon cancer and may be one of key roles in progression and metastasis in colon cancer.

Function electrical stimulation signals generator circuits for the central nerve and the sciatic nerve

Circuits for the signal generation of the FES (functional electrical stimulation) of the central nerve and the sciatic nerve have been designed. The circuits were implemented by using discrete devices. The FES circuits consist of two or three operational amplifiers. The bandwidths of the circuits are more than 10 kHz and their gains are variable from 20 dB to 60 dB. To a load of several kilo-ohms, according to the microelectrode with the nerve, the circuit for stimulating central nerve can provide a current signal, and the signal value is more than 1mA. The circuit for stimulating sciatic nerve can provide a stimulating voltage signal of more than 10 Vs. The loads of the circuits are microelectrodes contacted with nerves. The circuits can be used with two kinds of microelectrodes: cuff microelectrodes which for stimulating sciatic nerve and shaft microelectrodes which for stimulating central nerve.