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Wu W.,Wuhan University | Lu Z.,Wuhan University | Li Y.,Central Hospital of Enshi Autonomous Prefecture | Chen Z.,Central Hospital of Huangshi | And 2 more authors.
Acta Cardiologica Sinica | Year: 2015

Background: The objective of this study was to compare the expression of heat shock proteins (HSPs) between rheumatic heart disease (RHD) patients with atrial fibrillation (AF) and RHD patients without AF, and its efficacy in predicting the occurrence of AF in RHD patients. Methods: Ninety-five patients were enrolled in our study, including 60 RHD patients with AF, and 35 RHD patients without AF. The baseline characteristics of the patients such as gender, age, AF duration, left atrial diameter and left ventricular ejection fraction were collected, and erythrocyte sedimentation rate and high-sensitivity C-reaction protein were measured from all patients. Tissue samples were obtained from the right atrial appendage during open-heart surgery and then detected using immunohistochemicalmethods andWestern blot with HSP27, HSP60, HSP70 and HSP90 antibodies. Results: Compared with RHD patients without AF, the density of HSP27 positive protein in RHD patients with AF was significantly lower. The density of HSP60, HSP70 or HSP90 antibodies did not indicate significant difference between the two groups. Use of theWestern blot experiment showed consistent results with immunohistochemical staining. In RHD patients with AF, the expression level of HSP27 protein was negatively associated with AF duration and left atrial diameter. Left atrial enlargement and low expression of HSP27 were the independent predictors of AF. Conclusions: The decreased expression level of HSP27 is associated with AF in RHD patients.

Jin D.,Central Hospital of Huangshi | Wu Y.,Central Hospital of Huangshi | Zhao L.,Central Hospital of Huangshi | Guo J.,Central Hospital of Huangshi | And 2 more authors.
Experimental and Therapeutic Medicine | Year: 2012

High mobility group box 1 protein (HMGB1) has been identified as a novel pro-inflammatory cytokine in coronary artery disease. This study investigated the effect of atorvastatin on serum HMGB1 levels in patients with hyperlipidemia. In 72 patients with hyperlipidemia, serum total cholesterol (TC), triglycerides (TG), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C) and high-sensitivity C-reactive protein (hs-CRP) were compared with the levels in 32 control patients. In hyperlipidemic patients, serum HMGB1 levels were also determined by ELISA before and after a 3-month treatment of atorvastatin (20 mg/day). TC and LDL-C levels in the hyperlipidemic group (6.37±0.94 and 4.99±0.75 mmol/l, respectively) were significantly higher compared to those in the control group (4.34±0.89 and 2.57±0.82 mmol/l, respectively) (both P<0.05). Hs-CRP and HMGB1 levels in the hyperlipidemic group (3.91±1.06 mg/l and 5.42±1.56 ng/ml, respectively) were also significantly higher compared to those in the control group (1.53±0.45 mg/l and 2.11±0.95 ng/ml, respectively) (both P<0.05). After treatment with atorvasatin for three months, TC and LDL-C levels in the hyperlipidemic group were significantly decreased compared to those prior to treatment (TC, 4.67±0.89 vs. 6.37±0.94 mmol/l and LDL-C, 2.75±0.92 vs. 4.99±0.75 mmol/l, respectively) (both P<0.05). HMGB1 and hs-CRP levels in the hyperlipidemic group (3.07±1.24 ng/ml and 1.87±0.79 mg/l, respectively) were also significantly decreased compared to levels prior to treatment (5.42±1.56 ng/ml and 3.91±1.06 mg/l, respectively) (both P<0.05). Serum HMGB1 levels are increased in patients with hyperlipidemia which could be reduced by atorvastatin.

Kai Z.,Central Hospital of Huangshi | Yongbo W.,Central Hospital of Huangshi | Lin Z.,Central Hospital of Huangshi | Jie G.,Central Hospital of Huangshi | And 2 more authors.
Cardiology Journal | Year: 2013

Background: Glucagon-like peptide-1 and its receptor agonist-exendin-4 (Ex-4) have been shown to provide beneficial effects for cardiovascular diseases. This study investigated the effects of Ex-4 on ischemia-induced ventricular arrhythmias in rats. Methods: Anesthetized male rats were once treated with Ex-4 (5 μg/kg, i.v.) 1 h before ischemia in the absence and/or presence of 5-hydroxydecanoic acid (5-HD, 10 mg/kg, i.v., a specific inhibitor of mitochondrial ATP-sensitive potassium [KATP] channels) which were once injected 10 min before ischemia. And then subjected to ischemia for 30 min. Ventricular arrhythmias were assessed. Results: During the 30-min ischemia, Ex-4 significantly reduced the incidence of ventricular fibrillation (VF) (p < 0.05). The duration of ventricular tachycardia (VT) + VF, the number of VT + VF episodes and the severity of arrhythmias were all significantly reduced by Ex-4 compared to those in myocardial ischemia group (p < 0.05 for all). Administration of 5-HD abolished the protective effects of Ex-4 on VF incidence, the duration of VT + VF, the number of VT + VF episodes and the severity of arrhythmias (p < 0.05 for all). Conclusions: This study suggested that Ex-4 could attenuate ischemia-induced ventricular arrhythmias in rats in which mitochondrial KATP channels may be involved. © 2013 Via Medica.

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