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中国临床药理学与治疗学 ›› 2012, Vol. 17 ›› Issue (4): 398-402.

• 基础研究 • 上一篇    下一篇

线粒体融合素2在糖尿病大鼠心肌损伤中的变化

康品方1,2, 高琴2,3, 王晓梅2, 叶红伟2, 李正红2, 陈耀1, 张晔1, 王洪巨1   

  1. 1蚌埠医学院第一附属医院心内科;
    2生理学教研室, 蚌埠 233004, 安徽;
    3安徽省组织移植重点实验室, 蚌埠 233030, 安徽
  • 收稿日期:2011-12-28 修回日期:2012-02-22 发布日期:2012-04-28
  • 通讯作者: 王洪巨,男,博士,副教授,主任医师,硕士研究生导师,研究方向: 心血管疾病研究。Tel: 0552-3086103 E-mail: docwhj1101@163.com
    高琴,女,博士,副教授,研究方向:心血管生理学。Tel: 0552-3175268 E-mail: bbmcgq@126.com
  • 作者简介:康品方,女,硕士研究生,研究方向:心血管生理学。Tel: 15215520622 E-mail: kangpinfang.1016@163.com
  • 基金资助:
    国家自然科学基金资助项目(81000074);安徽省自然科学基金资助项目(090413097)

The changes of mitofusin 2 on myocardial injury in diabetic rats

KANG Pin-fang1,2, GAO Qin2,3, WANG Xiao-mei2, YE Hong-wei2, LI Zheng-hong2, CHEN Yao1, ZHANG Ye1, WANG Hong-ju1   

  1. 1Department of Cardiovascular Medicine, the First Affiliated Hospital of Bengbu Medical College, Bengbu 233004, Anhui, China;
    2Department of Physiology, Bengbu Medical College;
    3Anhui Key Laboratory of Tissue Transplantation, Bengbu Medical College, Bengbu 233030, Anhui, China
  • Received:2011-12-28 Revised:2012-02-22 Published:2012-04-28

摘要: 目的: 探讨线粒体融合素2(mitofusin 2,Mfn2)在糖尿病大鼠心肌损伤中的变化。方法: 腹腔注射 55 mg/kg 链脲佐菌素复制糖尿病大鼠模型,分为正常组、糖尿病4周组和糖尿病8周组。测定血流动力学指标、大鼠心系数;自动生化分析仪测定血浆肌酸激酶同工酶(creatine kinase isozyme,CK-MB)水平。RT-PCR检测左室心尖部组织Mfn2的表达。结果: 与正常大鼠相比,糖尿病4周、8周大鼠左室发展压、左室最大上升和下降速率、心率、左室做功均明显下降(P<0.05,P<0.01),心室舒张末压上升(P<0.01),心系数(HW/BW)明显增加(P<0.01),血浆CK-MB水平升高(P<0.05, P<0.01),Mfn2 mRNA的表达降低(P<0.01);与糖尿病4周相比,糖尿病8周大鼠左室发展压、左室最大上升速率和下降速率、心率及左室做功进一步下降(P<0.05,P<0.01),心室舒张末压升高(P<0.01),HW/BW、CK-MB水平持续性升高(P<0.01),Mfn2 mRNA的表达进一步降低(P<0.01)。结论: 随着糖尿病病程的延长,糖尿病大鼠心室功能进一步下降,其机制可能与Mfn2的表达降低有关。

关键词: 糖尿病, 心脏, 线粒体融合素2, 肌酸激酶同工酶

Abstract: AIM: To investigate the changes of mitofusin 2 (Mfn2) on myocardial injury in diabetic rats. METHODS: Diabetic rat model was simulated by intraperitoneal injection 55 mg/kg streptozotocin and divided into normal group, diabetes at 4th week (DM 4W), and diabetes at 8th week (DM 8W) groups. The ventricular hemodynamical parameters in vitro and heart weight/body weight (HW/BW) were determined. The level of CK-MB in serum was determined by automatic biochemistry analyzer. Mfn2 mRNA expression of left anterior myocardium was evaluated by RT-PCR. RESULTS: In contrast to normal rat, left ventricular developed pressure (LVDP), maximal rise/fall rate of left ventricular pressure (±dp/dtmax), heart rate (HR), left ventricular work (RPP) and CK-MB level were decreased in DM 4W and DM 8W rats (P<0.05, P<0.01), left ventricular end diastolic pressure (LVEDP) and HW/BW were increased (P<0.01), and the expression of Mfn2 mRNA was decreased (P<0.01); compared with DM 4W rat, LVDP, ±dp/dtmax, HR, RPP and CK-MB level were further decreased in DM 8W rat (P<0.05, P<0.01), LVEDP and HW/BW were increased (P<0.01), and the expression of Mfn2 mRNA was further decreased (P<0.01). CONCLUSION: With the development of diabetes, ventricular function was decreased further, it is maybe related to the decrease of Mfn2 mRNA expression.

Key words: Diabetes mellitus, Heart, Mitofusin 2, Creatine kinase isozyme

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