Pathogenesis and therapeutic targets of inflammatory cardiomyopathy based on bioinformatics analysis / 西安交通大学学报(医学版)

【Objective】 To make bioinformatics analysis of inflammatory cardiomyopathy so as to screen out hub genes related to etiology and therapeutic targets. 【Methods】 Differential expression analysis of inflammatory cardiomyopathy gene chip data from Gene Expression Omnibus （GEO） Database was carried out via GEO2R tool. Protein-protein interaction（PPI）network and hub genes identification were realized by String database and CytoHubba. GO and KEGG enrichment analysis for functional annotation and pathway analysis of hub genes were conducted by R language. Web-based enrichment analysis platform Enrichr and Drug Signatures database were applied to screen out candidate drugs targeting hub genes for inflammatory cardiomyopathy. 【Results】 The 149 DEGs were statistically significant， among which 44 were upregulated and 105 were downregulated. To identify hub genes， PPI network consisting of 37 nodes and 116 edges was constructed， and 16 hub genes were NDUFB7， POLR2L， NDUFS7， UQCR11， NDUFA13， NDUFA2， PHPT1， NDUFB10， UBA52， ATP5D， NDUFA3， COX6B1， POLR2J， COX4I2， AURKAIP1 and MRPL41. Hub genes were enriched to 113 different GO terms， and the most significant terms were mitochondrial ATP synthesis coupled electron transport， respiratory electron transport chain， oxidative phosphorylation， respiratory chain， mitochondrial inner membrane， NADH dehydrogenase activity and oxidoreductase activity. DEGs were enriched to 13 different signal pathways， including oxidative phosphorylation， non-alcoholic fatty liver disease， diabetic cardiomyopathy， and cardiac muscle contraction. We screened out candidate drugs targeting hub genes， namely， metformin hydrochloride， clindamycin， and hydralazine. 【Conclusion】 Hub genes screened out by decoding the expression profiles are convolved in the etiology and mechanism of inflammatory cardiomyopathy， which might serve as latent therapeutic targets and benefit patients with inflammatory cardiomyopathy.

Rosmarinic acid inhibits high glucose-induced cardiomyocyte hypertrophy by activating Parkin-mediated mitophagy / 南方医科大学学报

OBJECTIVE@#To evaluate the effect of rosmarinic acid (RA) on mitophagy and hypertrophy of cardiomyocytes exposed to high glucose (HG).@*METHODS@#Rat cardiomyocytes (H9c2) exposed to HG (25 mmol/L) were treated with 50 μmol/L RA or with both RA treatment and Parkin siRNA transfection, with the cells cultured in normal glucose (5.5 mmol/L) and HG as the controls. The expressions of PINK1, Parkin and LC3II/LC3I in the cells were detected by Western blotting. The formation of mitochondrial autophagosomes was observed by transmission electron microscope. Flow cytometry was employed to detect the level of reactive oxygen species (ROS) and apoptotic rate of the cells. The activities of respiratory chain complex enzymes were measured by spectrophotometry. Fluorescence enzyme labeling and @*RESULTS@#RA treatment significantly increased the expression levels of PINK1, Parkin and LC3-II/I (@*CONCLUSIONS@#RA can protect rat cardiomyocytes against oxidative stress injury and cardiomyocyte hypertrophy induced by HG by activating Parkin-mediated mitophagy.

Expression and clinical significance of serum angiopoietin-2 in patients with chronic heart failure / 西安交通大学学报(医学版)

Objective To investigate the expression of serum angiopoietin-2 (Ang-2 ) and its clinical significance in patients with chronic heart failure (CHF).Methods The levels of serum Ang-2,N-terminal pro-B-type natriuretic peptide (NT-proBNP)and left ventricular ejection fraction (LVEF)were detected in 1 1 3 patients with CHF,who were divided into four groups according to New York Heart Association (NYHA:class Ⅰ,n=3 2;Ⅱ,n=30;Ⅲ,n=26;Ⅳ,n=25).Another 20 healthy volunteers for physical check-up were chosen as the control group.Results With the change of cardiac function (from Ⅰ to Ⅳ),the levels of plasma Ang-2 and NT-proBNP were increased significantly (P<0.05 ).The level of serum Ang-2 was positively correlated with NT-proBNP (r=0.774,P<0.001),but negatively correlated with left ventricular ejection fraction (r=-0.725,P<0.001).Conclusion The level of serum Ang-2 has a significant correlation with the severity of heart failure.Ang-2 is expected to be used to predict and evaluate the severity of CHF.